CA2503248A1 - Highly bandwidth-efficient communications - Google Patents
Highly bandwidth-efficient communications Download PDFInfo
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- CA2503248A1 CA2503248A1 CA002503248A CA2503248A CA2503248A1 CA 2503248 A1 CA2503248 A1 CA 2503248A1 CA 002503248 A CA002503248 A CA 002503248A CA 2503248 A CA2503248 A CA 2503248A CA 2503248 A1 CA2503248 A1 CA 2503248A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
- H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/186—Phase-modulated carrier systems, i.e. using phase-shift keying in which the information is carried by both the individual signal points and the subset to which the individual signal points belong, e.g. coset coding or related schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
- H04L5/026—Multiplexing of multicarrier modulation signals using code division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/692—Hybrid techniques using combinations of two or more spread spectrum techniques
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70702—Intercell-related aspects
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03375—Passband transmission
- H04L2025/03414—Multicarrier
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0026—Division using four or more dimensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Abstract
A discret multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible.
A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.
A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.
Claims (102)
1. A method of analyzing a plurality of received signals, each received signal originating in a transmitted signal, transmitted by a separate transmitter spatially separated from The other transmit-ters, and each transmitted signal having a spectral and temporal distribution, comprising:
a) receiving the said plurality of received signals on a plural-ity of spatially separated antennas b) characterizing the plurality of received signals by 1) the receiving antenna,
a) receiving the said plurality of received signals on a plural-ity of spatially separated antennas b) characterizing the plurality of received signals by 1) the receiving antenna,
2) the spectral distribution of the received signal, and
3) the temporal distribution of the received signal;
c) assigning despread weights to each characterization of the plurality of received signals;
d) determining values of the said despread weights, in a man-ner that is independent of the particular characterization, said despread weights, when combined with the received signals, resulting in an approximation of the transmitted signals;
e) transmitting signals to the approximate location of the said transmitter, the said signals weighted by spreading weights that are obtained from the said despread weights associated with the said transmitter.
2. A method of processing signals representative of information comprising:
a) receiving signals, representative of information, at a multi-element antenna array of a receiving station;
1. said signals having been transmitted by at least two different spatially separated sources, each of which sources having transmitted signals representative of different information;
2. the mathematical representation of the spectral char-acteristics of the said signals capable of being put in a mathematical form that is substantially the same as the mathematical representation of the spatial charac-teristics of signals received by a multi-element an-tenna array;
b) processing the received signals in a manner that is substan-tially independent of the distinction between the spectral and spatial characteristics of the signals, to obtain adaptive spectral and spatial despreading weights that enhance the signal to noise and interference ratio of the said signals;
and c) identifying the information associated with the signals transmitted by each of the said at least two different spa-tially separated sources.
3. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming connection request signal from a remote station, spread over a plurality of common access channel frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
accessing a database at the base station and simultaneously (1) transmitting the connection request and a subscriber profile to a network switch for call set up, and (2) initiating a traffic chan-nel between the base station and the remote station; and signalling the network switch to disassemble the connection when the base station indicates a traffic channel cannot be estab-lished with the remote station.
c) assigning despread weights to each characterization of the plurality of received signals;
d) determining values of the said despread weights, in a man-ner that is independent of the particular characterization, said despread weights, when combined with the received signals, resulting in an approximation of the transmitted signals;
e) transmitting signals to the approximate location of the said transmitter, the said signals weighted by spreading weights that are obtained from the said despread weights associated with the said transmitter.
2. A method of processing signals representative of information comprising:
a) receiving signals, representative of information, at a multi-element antenna array of a receiving station;
1. said signals having been transmitted by at least two different spatially separated sources, each of which sources having transmitted signals representative of different information;
2. the mathematical representation of the spectral char-acteristics of the said signals capable of being put in a mathematical form that is substantially the same as the mathematical representation of the spatial charac-teristics of signals received by a multi-element an-tenna array;
b) processing the received signals in a manner that is substan-tially independent of the distinction between the spectral and spatial characteristics of the signals, to obtain adaptive spectral and spatial despreading weights that enhance the signal to noise and interference ratio of the said signals;
and c) identifying the information associated with the signals transmitted by each of the said at least two different spa-tially separated sources.
3. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming connection request signal from a remote station, spread over a plurality of common access channel frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
accessing a database at the base station and simultaneously (1) transmitting the connection request and a subscriber profile to a network switch for call set up, and (2) initiating a traffic chan-nel between the base station and the remote station; and signalling the network switch to disassemble the connection when the base station indicates a traffic channel cannot be estab-lished with the remote station.
4. The highly bandwidth-efficient communications method of claim 3, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
5. The highly bandwidth-efficient communications method of claim 3, wherein said incoming connection request signal includes a connection request, a remote station identification, and a sub-scriber line number to the base station.
6. The highly bandwidth-efficient communications method of claim 3, wherein said step of accessing a database includes the step of identifying a particular subscriber and related profile for use by the network switch.
7. The highly bandwidth-efficient communications method of claim 3, wherein said database includes subscriber spreading weights and despreading weights used in processing messages between the remote station and the base station.
8. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
receiving at said base station a second spread signal com-prising an incoming connection request signal from the remote station, spread over a plurality of common access channel fre-quencies;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said connection request;
accessing a database at the base station and simultaneously (1) transmitting the connection request and a subscriber profile to a network switch for call set up, and (2) initiating a traffic chan-nel between the base station and the remote station; and signalling the network switch to disassemble the connection when the base station indicates a traffic channel cannot be estab-lished with the remote station.
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
receiving at said base station a second spread signal com-prising an incoming connection request signal from the remote station, spread over a plurality of common access channel fre-quencies;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said connection request;
accessing a database at the base station and simultaneously (1) transmitting the connection request and a subscriber profile to a network switch for call set up, and (2) initiating a traffic chan-nel between the base station and the remote station; and signalling the network switch to disassemble the connection when the base station indicates a traffic channel cannot be estab-lished with the remote station.
9. The highly bandwidth-efficient communications method of claim 8, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
10. The highly bandwidth-efficient communications method of claim 8, wherein said incoming connection request signal includes a connection request, a remote station identification, and a sub-scriber line number to the base station.
11. The highly bandwidth-efficient communications method of claim 8, wherein said step of accessing a database includes the step of identifying a particular subscriber and related profile for use by the network switch.
12. The highly bandwidth-efficient communications method of claim 8, wherein said database includes subscriber spreading weights and despreading weights used in processing messages between the remote station and the base station.
13. A wireless communication system with improved access to a communication network, comprising:
at least one remote station coupled to a wireless link and serving multiple subscribers;
a base station coupled to the wireless link and communicat-ing with at least one remote station using a Common Access Channel (CAC) and a Common Link Channel (CLC);
a network switch coupled to the base station and to the communication network;
means for originating a call at the remote station and transmitting a connection request remote station identification, and subscriber line number to the base station over the common access channel;
base station means responsive to the call for accessing a database and simultaneously (1) transmitting the connection request and a subscriber profile to the network switch for call set up, and (2) initiating a traffic channel between the base station and a remote station; and an error processor included in the base station for signal-ling the network switch to the disassemble the connection when the base station indicates a traffic channel cannot be established.
at least one remote station coupled to a wireless link and serving multiple subscribers;
a base station coupled to the wireless link and communicat-ing with at least one remote station using a Common Access Channel (CAC) and a Common Link Channel (CLC);
a network switch coupled to the base station and to the communication network;
means for originating a call at the remote station and transmitting a connection request remote station identification, and subscriber line number to the base station over the common access channel;
base station means responsive to the call for accessing a database and simultaneously (1) transmitting the connection request and a subscriber profile to the network switch for call set up, and (2) initiating a traffic channel between the base station and a remote station; and an error processor included in the base station for signal-ling the network switch to the disassemble the connection when the base station indicates a traffic channel cannot be established.
14. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
resetting a message segment buffer in said base station and storing a message segment therein, if said priority interrupt flag has a first value;
concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
resetting a message segment buffer in said base station and storing a message segment therein, if said priority interrupt flag has a first value;
concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
15. The highly bandwidth-efficient communications method of claim 14, wherein said base station is part of a wireless discrete multitone spread spectrum communications system.
16. The highly bandwidth-efficient communications method of claim 14, wherein said message segment is a system management message segment.
17. The highly bandwidth-efficient communications method of claim 14, wherein said first value of said priority interrupt flag corre-sponds to a time critical message segment.
18. The highly bandwidth-efficient communications method of claim 14, wherein said second value of said priority interrupt flag corre-sponds to a message segment that is not a first segment.
19. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said base station a second spread signal com-prising an incoming message segment signal having a message segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the base station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said message segment portion and said priority interrup flag portion;
resetting a message segment buffer in said base station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment, if said priority interrupt flag has a second value.
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said base station a second spread signal com-prising an incoming message segment signal having a message segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the base station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said message segment portion and said priority interrup flag portion;
resetting a message segment buffer in said base station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment, if said priority interrupt flag has a second value.
20. The highly bandwidth-efficient communications method of claim 19, wherein said base station is part of a wireless discrete multitone spread spectrum communications system.
21. The highly bandwidth-efficient communications method of claim 19, wherein said message segment is a system management message segment.
22. The highly bandwidth-efficient communications method of claim 19, wherein said first value of said priority interrupt flag corre-sponds to a time critical message segment.
23. The highly bandwidth-efficient communications method of claim 19, wherein said second value of said priority interrupt flag corresponds to a message segment that is not a first segment.
24. A highly bandwidth-efficient communications method, comprising the steps of:
transmitting from a base station a transmitted spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies and an outgoing message segment signal spread over a plurality of link control frequencies;
said outgoing message segment signal being part of a low priority message having a second outgoing message segment signal to be transmitted receiving at said base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
interrupting transmission of said second outgoing message segment signal, resetting a message segment buffer in said base station, and storing said incoming message segment signal therein, if said priority interrupt flag has a first value;
concatenating said incoming message segment signal with a previously received message segment, if said priority interrupt flag has a second value.
transmitting from a base station a transmitted spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies and an outgoing message segment signal spread over a plurality of link control frequencies;
said outgoing message segment signal being part of a low priority message having a second outgoing message segment signal to be transmitted receiving at said base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
interrupting transmission of said second outgoing message segment signal, resetting a message segment buffer in said base station, and storing said incoming message segment signal therein, if said priority interrupt flag has a first value;
concatenating said incoming message segment signal with a previously received message segment, if said priority interrupt flag has a second value.
25. The highly bandwidth-efficient communications method of claim 24, wherein said message segment signals are system manage-ment message segment signals.
26. ~The highly bandwidth-efficient communications method of claim 24, wherein said first value of said priority interrupt flag corre-sponds to a time critical message segment signal.
27. ~The highly bandwidth-efficient communications method of claim 24, wherein said second value of said priority interrup flag corre-sponds to a message segment signal that is not a first segment.
28. ~A highly bandwidth-efficient communications method, comprising the steps of:
transmitting from a base station a transmitted spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies and an outgoing message segment signal spread over a plurality of link control frequencies;
said outgoing message segment signal being part of a low priority message having a second outgoing message segment signal to be transmitted;
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said base station a second spread signal com-prising an incoming message segment signal having a message segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the base station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
interrupting transmission of said second outgoing message segment signal, resetting a message segment buffer in said base station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment, if said priority interrupt flag has a second value.
transmitting from a base station a transmitted spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies and an outgoing message segment signal spread over a plurality of link control frequencies;
said outgoing message segment signal being part of a low priority message having a second outgoing message segment signal to be transmitted;
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said base station a second spread signal com-prising an incoming message segment signal having a message segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the base station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
interrupting transmission of said second outgoing message segment signal, resetting a message segment buffer in said base station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment, if said priority interrupt flag has a second value.
29. The highly bandwidth-efficient communications method of claim 19, wherein said base station is part of a wireless discrete multitone spread spectrum communications system.
30. The highly bandwidth-efficient communications method of claim 19, wherein said message segment is a system management message segment.
31. The highly bandwidth-efficient communications method of claim 19, wherein said first value of said priority interrupt flag corre-sponds to a time critical message segment.
32. The highly bandwidth-efficient communications method of claim 19, wherein said second value of said priority interrupt flag corresponds to a message segment that is not a first segment.
33. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a station a spread signal comprising an incom-ing data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
resetting a message segment buffer in said station and storing a message segment therein, if said priority interrupt flag has a first value;
concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
receiving at a station a spread signal comprising an incom-ing data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
adaptively despreading the signals received at the station by using despreading weights;
detecting a priority interrupt flag value in said message segment signal;
resetting a message segment buffer in said station and storing a message segment therein, if said priority interrupt flag has a first value;
concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
34. ~The highly bandwidth-efficient communications method of claim 33, wherein said station is part of a wireless discrete multitone spread spectrum communications system.
35. ~The highly bandwidth-efficient communications method of claim 33, wherein said message segment is a system management message segment.
36. ~The highly bandwidth-efficient communications method of claim 33, wherein said first value of said priority interrup flag corre-sponds to a time critical message segment.
37. ~The highly bandwidth-efficient communications method of claim 33, wherein said second value of said priority interrup flag corre-sponds to a message segment that is not a first segment.
38. ~The highly bandwidth-efficient communications method of claim 33, wherein said station is a base station in a wireless discrete multitone spread spectrum communications system.
39. The highly bandwidth-efficient communications method of claim 33, wherein said station is a remote station in a wireless discrete multitone spread spectrum communications system.
40. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said station a second spread signal comprising an incoming message segment signal having a message segment portion and a priority interrup flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
resetting a message segment buffer in said station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment if said priority interrupt flag has a second value.
receiving at a station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
receiving at said station a second spread signal comprising an incoming message segment signal having a message segment portion and a priority interrup flag portion spread over a plurality of link control frequencies;
adaptively despreading said first spread signal received at the station by using despreading weights, recovering said data portion;
adaptively despreading said second spread signal received at the station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
resetting a message segment buffer in said station and storing said message segment portion therein, if said priority interrupt flag has a first value;
concatenating said message segment portion with a previ-ously received message segment if said priority interrupt flag has a second value.
41. The highly bandwidth-efficient communications method of claim 40, wherein said Station is a base station in a wireless discrete multitone spread spectrum communications system.
42. The highly bandwidth-efficient communications method of claim 40, wherein said station is a remote station in a wireless discrete multitone spread spectrum communications system.
43. A highly bandwidth-efficient communications system, compris-ing:
means for receiving at a base station a spread signal com-prising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
means for adaptively despreading the signals received at the base station by using despreading weights;
means for detecting a priority interrupt flag value in said message segment signal;
means for resetting a message segment buffer in said base station and storing a message segment therein, if said priority interrupt flag has a first value;
means for concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
means for receiving at a base station a spread signal com-prising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming message segment signal spread over a plurality of link control frequencies;
means for adaptively despreading the signals received at the base station by using despreading weights;
means for detecting a priority interrupt flag value in said message segment signal;
means for resetting a message segment buffer in said base station and storing a message segment therein, if said priority interrupt flag has a first value;
means for concatenating said message segment with a previously received message segment, if said priority interrupt flag has a second value.
44. The highly bandwidth-efficient communications system of claim 43, wherein said base station is part of a wireless discrete multitone spread spectrum communications system.
45. The highly bandwidth-efficient communications system of claim 43, wherein said message segment is a system management message segment.
46. The highly bandwidth-efficient communications system of claim 43, wherein said first value of said priority interrupt flag corre-sponds to a time critical message segment.
47. ~The highly bandwidth-efficient communications system of claim 43, wherein said second value of said priority interrupt flag corresponds to a message segment that is not a first segment.
48. ~A highly bandwidth-efficient communications system, compris-ing:
means for receiving at a Station a first spread signal com-prising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
means for receiving at said Station a second spread signal comprising an incoming message segment signal having a mes-sage segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;~
means for adaptively despreading said first spread signal received at the station by using despreading weights, recovering said data portion;
means for adaptively despreading said second spread signal received at the station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
means for resetting a message segment buffer in said station and storing said message segment portion therein, if said priority interrupt flag has a first value;
means for concatenating said message segment portion with a previously received message segment, if said priority interrupt flag has a second value.
means for receiving at a Station a first spread signal com-prising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies;
means for receiving at said Station a second spread signal comprising an incoming message segment signal having a mes-sage segment portion and a priority interrupt flag portion spread over a plurality of link control frequencies;~
means for adaptively despreading said first spread signal received at the station by using despreading weights, recovering said data portion;
means for adaptively despreading said second spread signal received at the station by using despreading weights, recovering said message segment portion and said priority interrupt flag portion;
means for resetting a message segment buffer in said station and storing said message segment portion therein, if said priority interrupt flag has a first value;
means for concatenating said message segment portion with a previously received message segment, if said priority interrupt flag has a second value.
49. The highly bandwidth-efficient communications system of claim 48, wherein said station is a base station in a wireless discrete multitone spread spectrum communications system.
50. The highly bandwidth-efficient communications system of claim 48, wherein said station is a remote station in a wireless discrete multitone spread spectrum communications system.
51. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming functional quality and mainte-nance signal characterizing a remote station, spread over a plural-ity of common access channel frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
storing said functional quality and maintenance signal at said base station;
analyzing functional quality data from said functional quality and maintenance signal and updating said despreading weights at the base station; and analyzing maintenance data from said functional quality and maintenance signal and outputting a maintenance notice at the base station.
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming functional quality and mainte-nance signal characterizing a remote station, spread over a plural-ity of common access channel frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
storing said functional quality and maintenance signal at said base station;
analyzing functional quality data from said functional quality and maintenance signal and updating said despreading weights at the base station; and analyzing maintenance data from said functional quality and maintenance signal and outputting a maintenance notice at the base station.
52. The highly bandwidth-efficient communications method of claim 51, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
53. The highly bandwidth-efficient communications method of claim 51, wherein said step of analyzing functional quality data further comprises:
updating spreading weights at the base station.
updating spreading weights at the base station.
54.~The highly bandwidth-efficient communications method of claim 51, wherein said functional quality data includes SINR history data characterizing communications with said remote station.
55. The highly bandwidth-efficient communications method of claim 51, wherein said functional quality data includes path loss history data characterizing communications with said remote station.
56. The highly bandwidth-efficient communications method of claim 51, wherein said maintenance data includes self test results data characterizing said remote station.
57.~The highly bandwidth-efficient communications method of claim 51, wherein said maintenance data includes battery status data characterizing said remote station.
58. The highly bandwidth-efficient communications method of claim 51, which further comprises:
initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
59. The highly bandwidth-efficient communications method of claim 51, which further comprises:
initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
60. The highly bandwidth-efficient communications method of claim 51, which further comprises:
logging the functional quality data for compilation of a longer term report of a traffic channel quality, in response to said functional quality signal.
logging the functional quality data for compilation of a longer term report of a traffic channel quality, in response to said functional quality signal.
61. A highly bandwidth-efficient communications method, comprising the steps of:
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
receiving at said base station a second spread signal com-prising an incoming functional quality and maintenance signal having a functional quality data portion and maintenance data portion spread over a plurality of common access channel fre-~
quencies, from said remote station;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said functional quality data portion and said maintenance data portion;
storing said functional quality data and maintenance data at said base station;
analyzing said functional quality data and updating said despreading weights at the base station; and analyzing said maintenance data and outputting a mainte-nance notice at the base station.
receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
receiving at said base station a second spread signal com-prising an incoming functional quality and maintenance signal having a functional quality data portion and maintenance data portion spread over a plurality of common access channel fre-~
quencies, from said remote station;
adaptively despreading said second spread signal received at the base station by using despreading weights, recovering said functional quality data portion and said maintenance data portion;
storing said functional quality data and maintenance data at said base station;
analyzing said functional quality data and updating said despreading weights at the base station; and analyzing said maintenance data and outputting a mainte-nance notice at the base station.
62. The highly bandwidth-efficient communications method of claim 61, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
63. The highly bandwidth-efficient communications method of claim 61, wherein said step of analyzing functional quality data further comprises:
updating spreading weights at the base station.
updating spreading weights at the base station.
64. The highly bandwidth-efficient communications method of claim 61, wherein said functional quality data includes SINR history data characterizing communications with said remote station.
65. The highly bandwidth-efficient communications method of claim 61, wherein said functional quality data includes path loss history data characterizing communications with said remote station.
66. The highly bandwidth-efficient communications method of claim 61, wherein said maintenance data includes self-test results data characterizing said remote station.
67. The highly bandwidth-efficient communications method of claim 61, wherein said maintenance data includes battery status data characterizing said remote station.
68. The highly bandwidth-efficient communications method of claim 61, which further comprises:
initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
69. The highly bandwidth-efficient communications method of claim 61, which further comprises:
initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
70. The highly bandwidth-efficient communications method of claim 61, which further comprises:
logging the functional quality data for compilation of a longer term report of a traffic channel quality, in response to said functional quality signal.
logging the functional quality data for compilation of a longer term report of a traffic channel quality, in response to said functional quality signal.
71. A highly bandwidth-efficient communications system, compris-ing:
means for receiving at a base station a spread signal com-prising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming functional quality and maintenance signal characterizing a remote station, spread over a plurality of common access channel frequencies;
means for adaptively despreading the signals received at the base station by using despreading weights;
means for storing said functional quality and maintenance signal at said base station;
means for analyzing functional quality data from said functional quality and maintenance signal and updating said despreading weights at the base station; and means for analyzing maintenance data from said functional quality and maintenance signal and outputting a maintenance notice at the base station.
means for receiving at a base station a spread signal com-prising an incoming data traffic signal spread over a plurality of discrete traffic frequencies and an incoming functional quality and maintenance signal characterizing a remote station, spread over a plurality of common access channel frequencies;
means for adaptively despreading the signals received at the base station by using despreading weights;
means for storing said functional quality and maintenance signal at said base station;
means for analyzing functional quality data from said functional quality and maintenance signal and updating said despreading weights at the base station; and means for analyzing maintenance data from said functional quality and maintenance signal and outputting a maintenance notice at the base station.
72. The highly bandwidth-efficient communications system of claim 71, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
73. The highly bandwidth-efficient communications system of claim 71, which further comprises: means for analyzing functional quality data by updating spreading weights at the base station.
74. The highly bandwidth-efficient communications system of claim 71, wherein said functional quality data includes SINR history data characterizing communications with said remote station.
75. The highly bandwidth-efficient communications system of claim 71, wherein said functional quality data includes path loss history data characterizing communications with said remote station.
76. The highly bandwidth-efficient communications system of claim 71, wherein said maintenance data includes self-test results data characterizing said remote station.
77. The highly bandwidth-efficient communications system of claim 71, wherein said maintenance data includes battery status data characterizing said remote station.
78. The highly bandwidth-efficient communications system of claim 71, which further comprises:
means for initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
means for initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
79. The highly bandwidth-efficient communications system of claim 71, which further comprises:
means for initiating an alarm at the base station to be used for real time control, in response to said functional quality data.
means for initiating an alarm at the base station to be used for real time control, in response to said functional quality data.
80. The highly bandwidth-efficient communications system of claim 71, which further comprises:
means for logging the functional quality data for compila-tion of a longer term report of a traffic channel quality, in re-sponse to said functional quality signal.
means for logging the functional quality data for compila-tion of a longer term report of a traffic channel quality, in re-sponse to said functional quality signal.
81. A highly bandwidth-efficient communications system, compris-ing:
means for receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
means for receiving at said base station a second spread signal comprising an incoming functional quality and maintenance signal having a functional quality data portion and maintenance data portion spread over a plurality of common access channel frequencies, from said remote station;
means for adaptively despreading said second spread signal received at the base station by using despreading weights, recov-ering said functional quality data portion and said maintenance data portion;
means for storing said functional quality data and mainte-nance data at said base station;
means for analyzing said functional quality data and updat-ing said despreading weights at the base station; and means for analyzing said maintenance data and outputting a maintenance notice at the base station.
means for receiving at a base station a first spread signal comprising an incoming data traffic signal having a data portion spread over a plurality of discrete traffic frequencies, from a remote station;
means for receiving at said base station a second spread signal comprising an incoming functional quality and maintenance signal having a functional quality data portion and maintenance data portion spread over a plurality of common access channel frequencies, from said remote station;
means for adaptively despreading said second spread signal received at the base station by using despreading weights, recov-ering said functional quality data portion and said maintenance data portion;
means for storing said functional quality data and mainte-nance data at said base station;
means for analyzing said functional quality data and updat-ing said despreading weights at the base station; and means for analyzing said maintenance data and outputting a maintenance notice at the base station.
82. The highly bandwidth-efficient communications system of claim 81, wherein said base station and said remote station are part of a wireless discrete multitone spread spectrum communications system.
83. The highly bandwidth-efficient communications system of claim 81, which further comprises:
means for analyzing functional quality data by updating spreading weights at the base station.
means for analyzing functional quality data by updating spreading weights at the base station.
84. The highly bandwidth-efficient communications system of claim 81, wherein said functional quality data includes SINR history data characterizing communications with said remote station.
85. The highly bandwidth-efficient communications system of claim 81, wherein said functional quality data includes path loss history data characterizing communications with said remote station.
86. The highly bandwidth-efficient communications system of claim 81, wherein said maintenance data includes self-test results data characterizing said remote station.
87. The highly bandwidth-efficient communications system of claim 81, wherein said maintenance data includes battery status data characterizing said remote station.
88. The highly bandwidth-efficient communications system of claim 81, which further comprises:
means for initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
means for initiating an update in spreading and despreading weights at the base station in an effort to improve the signal and interference to noise ratio of a traffic channel, in response to said functional quality data.
89. The highly bandwidth-efficient communications system of claim 81, which further comprises:
means for initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
means for initiating an alarm at the base station to be used for realtime control, in response to said functional quality data.
90. The highly bandwidth-efficient communications system of claim 81, which further comprises:
means for logging the functional quality data for compila-tion of a longer term report of a traffic channel quality, in re-sponse to said functional quality signal.
means for logging the functional quality data for compila-tion of a longer term report of a traffic channel quality, in re-sponse to said functional quality signal.
91. A highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network, comprising:
transmitting from the base station, forward pilot tones with a prearranged initial forward signal power level, to the remote station;
receiving at the remote station the forward pilot tones with a signal power level that is less than the prearranged initial for-ward signal power level, the difference being a measure of the channel loss between the base station and the remote station;
storing at the remote station the value of the channel loss it mea-sures;
transmitting from the remote station, reverse pilot tones with a prearranged initial reverse signal power level, to the base station;
receiving at the base station the reverse pilot tones with a signal power level that is less than the prearranged initial reverse signal power level, the difference being a measure of the channel loss between the base station and the remote station;
storing at the base station the value of the channel loss it measures;
preparing at the base station despreading weights to despread DMT-SS signals it receives from the remote station;
computing at the base station spreading weights for trans-mission of DMT-SS signals to the remote station, the spreading weights calculated at the base station including a factor based on the measured channel loss stored at the base station, to overcome the channel loss so that forward signals transmitted to the remote station will arrive there with a desired received signal power level;
preparing at the remote station despreading weights to despread DMT-SS signals it receives from the base station;
computing at the remote station spreading weights for transmission of DMT-SS signals to the base station, the spreading weights calculated at the remote station including a factor based on the measured channel loss stored at the remote station, to overcome the channel loss so that reverse signals transmitted to the base station will arrive there with a desired received signal power level;
whereby the power level of signals transmitted by remote stations and base stations is controlled to minimize interference while insuring that signals reach their intended destination.
transmitting from the base station, forward pilot tones with a prearranged initial forward signal power level, to the remote station;
receiving at the remote station the forward pilot tones with a signal power level that is less than the prearranged initial for-ward signal power level, the difference being a measure of the channel loss between the base station and the remote station;
storing at the remote station the value of the channel loss it mea-sures;
transmitting from the remote station, reverse pilot tones with a prearranged initial reverse signal power level, to the base station;
receiving at the base station the reverse pilot tones with a signal power level that is less than the prearranged initial reverse signal power level, the difference being a measure of the channel loss between the base station and the remote station;
storing at the base station the value of the channel loss it measures;
preparing at the base station despreading weights to despread DMT-SS signals it receives from the remote station;
computing at the base station spreading weights for trans-mission of DMT-SS signals to the remote station, the spreading weights calculated at the base station including a factor based on the measured channel loss stored at the base station, to overcome the channel loss so that forward signals transmitted to the remote station will arrive there with a desired received signal power level;
preparing at the remote station despreading weights to despread DMT-SS signals it receives from the base station;
computing at the remote station spreading weights for transmission of DMT-SS signals to the base station, the spreading weights calculated at the remote station including a factor based on the measured channel loss stored at the remote station, to overcome the channel loss so that reverse signals transmitted to the base station will arrive there with a desired received signal power level;
whereby the power level of signals transmitted by remote stations and base stations is controlled to minimize interference while insuring that signals reach their intended destination.
92. The highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 91, wherein both the forward pilot tones and the reverse pilot tones have a spectral form of a discrete multitone signal.
93. The highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 91, wherein said computing spreading weights at the base station uses the principle of retrodirectivity.
94. The highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 91, wherein said computing spreading weights at the remote station uses the princi-ple of retrodirectivity.
95. The highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 92, wherein the base station has a multi-element antenna array for receiving DMT-SS spread signals, receiving steps at the base station com-prising:
despreading DMT-SS spread signals with a unitary, adap-tive despreading code that is based on the characteristics of a received spread signal, where a given element of the despreading code corresponds to a given one of said multi-element antennas and a given one of a plurality of received, discrete tones;
whereby spatial and spectral samples of the DMT-SS
spread signals are treated simultaneously.
despreading DMT-SS spread signals with a unitary, adap-tive despreading code that is based on the characteristics of a received spread signal, where a given element of the despreading code corresponds to a given one of said multi-element antennas and a given one of a plurality of received, discrete tones;
whereby spatial and spectral samples of the DMT-SS
spread signals are treated simultaneously.
96. The highly bandwidth-efficient communications method to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 92, wherein the forward pilot tones and the reverse pilot tones are transmitted during consecutive parts of a time division duplex period.
97. A highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network, comprising:
means for transmitting from the base station, forward pilot tones with a prearranged initial forward signal power level, to the remote station;
means for receiving at the remote station the forward pilot tones with a signal power level that is less than the prearranged initial forward signal power level, the difference being a measure of the channel loss between the base station and the remote sta-tion;
means for storing at the remote station the value of the channel loss it measures;
means for transmitting from the remote station, reverse pilot tones with a prearranged initial reverse signal power level, to the base station;
means for receiving at the base station the reverse pilot tones with a signal power level that is less than the prearranged initial reverse signal power level, the difference being a measure of the channel loss between the base station and the remote sta-tion; means for storing at the base station the value of the channel loss it measures;
means for preparing at the base station despreading weights to despread DMT-SS signals it receives from the remote station;
means for computing at the base station spreading weights for transmission of DMT-SS signals to the remote station, the spreading weights calculated at the base station including a factor based on the measured channel loss stored at the base station, to overcome the channel loss so that forward signals transmitted to the remote station will arrive there with a desired received signal power level;
means for preparing at the remote station despreading weights to despread DMT-SS signals it receives from the base station;
means for computing at the remote station spreading weights for transmission of DMT-SS signals to the base station, the spreading weights calculated at the remote station including a factor based on the measured channel loss stored at the remote station, to overcome the channel loss so that reverse signals transmitted to the base station will arrive there with a desired received signal power level;
whereby the power level of signals transmitted by remote stations and base stations is controlled to minimize interference while insuring that signals reach their intended destination.
means for transmitting from the base station, forward pilot tones with a prearranged initial forward signal power level, to the remote station;
means for receiving at the remote station the forward pilot tones with a signal power level that is less than the prearranged initial forward signal power level, the difference being a measure of the channel loss between the base station and the remote sta-tion;
means for storing at the remote station the value of the channel loss it measures;
means for transmitting from the remote station, reverse pilot tones with a prearranged initial reverse signal power level, to the base station;
means for receiving at the base station the reverse pilot tones with a signal power level that is less than the prearranged initial reverse signal power level, the difference being a measure of the channel loss between the base station and the remote sta-tion; means for storing at the base station the value of the channel loss it measures;
means for preparing at the base station despreading weights to despread DMT-SS signals it receives from the remote station;
means for computing at the base station spreading weights for transmission of DMT-SS signals to the remote station, the spreading weights calculated at the base station including a factor based on the measured channel loss stored at the base station, to overcome the channel loss so that forward signals transmitted to the remote station will arrive there with a desired received signal power level;
means for preparing at the remote station despreading weights to despread DMT-SS signals it receives from the base station;
means for computing at the remote station spreading weights for transmission of DMT-SS signals to the base station, the spreading weights calculated at the remote station including a factor based on the measured channel loss stored at the remote station, to overcome the channel loss so that reverse signals transmitted to the base station will arrive there with a desired received signal power level;
whereby the power level of signals transmitted by remote stations and base stations is controlled to minimize interference while insuring that signals reach their intended destination.
98. The highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 97, wherein both the forward pilot tones and the reverse pilot tones have a spectral form of a discrete multitone signal.
99. The highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 97, wherein said computing spreading weights at the base station uses the principle of retrodirectivity.
100. The highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 97, wherein said computing spreading weights at the remote station uses the princi-ple of retrodirectivity.
101. The highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 97, wherein the base station has a multi-element antenna array for receiving DMT-SS spread signals, further comprising:
means for despreading DMT-SS spread signals with a unitary, adaptive despreading code that is based on the character-istics of a received spread signal, where a given element of the despreading code corresponds to a given one of said multi-ele-ment antennas and a given one of a plurality of received, discrete tones; whereby spatial and spectral samples of the DMT-SS
spread signals are treated simultaneously.
means for despreading DMT-SS spread signals with a unitary, adaptive despreading code that is based on the character-istics of a received spread signal, where a given element of the despreading code corresponds to a given one of said multi-ele-ment antennas and a given one of a plurality of received, discrete tones; whereby spatial and spectral samples of the DMT-SS
spread signals are treated simultaneously.
102. The highly bandwidth-efficient communications system to control the power level of signals transmitted by remote stations and base stations in a DMT-SS wireless network of claim 97, wherein the forward pilot tones and the reverse pilot tones are transmitted during consecutive parts of a time division duplex period.
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| US08/993,721 US6359923B1 (en) | 1997-12-18 | 1997-12-18 | Highly bandwidth efficient communications |
| CA002283859A CA2283859C (en) | 1997-02-24 | 1998-02-24 | Highly bandwidth-efficient communications |
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| CA002283859A Expired - Fee Related CA2283859C (en) | 1997-02-24 | 1998-02-24 | Highly bandwidth-efficient communications |
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| CA002283859A Expired - Fee Related CA2283859C (en) | 1997-02-24 | 1998-02-24 | Highly bandwidth-efficient communications |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412576A (en) * | 2018-12-13 | 2019-03-01 | 江苏航天大为科技股份有限公司 | Multichannel AC high-voltage signal matrix collision detection controller |
| US10367568B1 (en) | 2018-08-08 | 2019-07-30 | At&T Intellectual Property I, L.P. | Determining precoding coefficients for fronthaul links in a cloud radio access network |
| US10484063B1 (en) | 2018-05-04 | 2019-11-19 | At&T Intellectual Property I, L.P. | Transmission of beamforming weight coefficients from digital baseband unit to remote radio unit |
| US20220078050A1 (en) * | 2018-12-17 | 2022-03-10 | U-Blox Ag | Estimating one or more characteristics of a communications channel |
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| US6928062B2 (en) * | 2002-10-29 | 2005-08-09 | Qualcomm, Incorporated | Uplink pilot and signaling transmission in wireless communication systems |
| US7042857B2 (en) | 2002-10-29 | 2006-05-09 | Qualcom, Incorporated | Uplink pilot and signaling transmission in wireless communication systems |
| US20050135457A1 (en) * | 2003-12-19 | 2005-06-23 | Molisch Andreas F. | Ultra wide bandwidth transmitter with tone grouping and spreading |
| US8611283B2 (en) | 2004-01-28 | 2013-12-17 | Qualcomm Incorporated | Method and apparatus of using a single channel to provide acknowledgement and assignment messages |
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| US8831115B2 (en) | 2004-12-22 | 2014-09-09 | Qualcomm Incorporated | MC-CDMA multiplexing in an orthogonal uplink |
| US8238923B2 (en) | 2004-12-22 | 2012-08-07 | Qualcomm Incorporated | Method of using shared resources in a communication system |
| JP4744577B2 (en) * | 2008-09-12 | 2011-08-10 | パナソニック株式会社 | Transmitting apparatus and transmitting method |
| WO2012108411A1 (en) | 2011-02-10 | 2012-08-16 | 日本電気株式会社 | Encoding/decoding processor and wireless communication apparatus |
| CN109368272A (en) * | 2018-10-29 | 2019-02-22 | 彩虹显示器件股份有限公司 | A kind of High Accuracy Flat apparatus for conveying glass |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI111580B (en) * | 1994-06-13 | 2003-08-15 | Nokia Corp | A power control method and arrangement for a handover in a mobile communication system |
| JP2944459B2 (en) * | 1995-04-07 | 1999-09-06 | 日本電気株式会社 | Transmission power control method in mobile communication system |
-
1998
- 1998-02-24 EP EP98910043A patent/EP0966797B8/en not_active Expired - Lifetime
- 1998-02-24 DE DE69833187T patent/DE69833187T2/en not_active Expired - Lifetime
- 1998-02-24 CA CA2503248A patent/CA2503248C/en not_active Expired - Fee Related
- 1998-02-24 JP JP53698498A patent/JP4175521B2/en not_active Expired - Fee Related
- 1998-02-24 CA CA002283859A patent/CA2283859C/en not_active Expired - Fee Related
-
2008
- 2008-02-06 JP JP2008027087A patent/JP4602426B2/en not_active Expired - Fee Related
- 2008-02-06 JP JP2008027088A patent/JP4602427B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10484063B1 (en) | 2018-05-04 | 2019-11-19 | At&T Intellectual Property I, L.P. | Transmission of beamforming weight coefficients from digital baseband unit to remote radio unit |
| US10367568B1 (en) | 2018-08-08 | 2019-07-30 | At&T Intellectual Property I, L.P. | Determining precoding coefficients for fronthaul links in a cloud radio access network |
| CN109412576A (en) * | 2018-12-13 | 2019-03-01 | 江苏航天大为科技股份有限公司 | Multichannel AC high-voltage signal matrix collision detection controller |
| CN109412576B (en) * | 2018-12-13 | 2024-04-12 | 江苏航天大为科技股份有限公司 | Multi-channel alternating-current high-voltage signal matrix conflict detection controller |
| US20220078050A1 (en) * | 2018-12-17 | 2022-03-10 | U-Blox Ag | Estimating one or more characteristics of a communications channel |
| US11601307B2 (en) * | 2018-12-17 | 2023-03-07 | U-Blox Ag | Estimating one or more characteristics of a communications channel |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0966797A2 (en) | 1999-12-29 |
| JP4175521B2 (en) | 2008-11-05 |
| JP4602426B2 (en) | 2010-12-22 |
| EP0966797B8 (en) | 2006-04-26 |
| DE69833187T2 (en) | 2006-09-21 |
| JP2002514368A (en) | 2002-05-14 |
| CA2283859C (en) | 2005-08-02 |
| JP2008187722A (en) | 2008-08-14 |
| JP4602427B2 (en) | 2010-12-22 |
| EP0966797B1 (en) | 2006-01-11 |
| DE69833187D1 (en) | 2006-04-06 |
| JP2008187721A (en) | 2008-08-14 |
| CA2283859A1 (en) | 1998-08-27 |
| CA2503248C (en) | 2012-02-07 |
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