WO2002058409A2 - Apparatus and method for creating signal and channel profiles at a receiving station - Google Patents
Apparatus and method for creating signal and channel profiles at a receiving station Download PDFInfo
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- WO2002058409A2 WO2002058409A2 PCT/IB2002/000136 IB0200136W WO02058409A2 WO 2002058409 A2 WO2002058409 A2 WO 2002058409A2 IB 0200136 W IB0200136 W IB 0200136W WO 02058409 A2 WO02058409 A2 WO 02058409A2
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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
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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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
- H04B7/022—Site diversity; Macro-diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/007—Unequal error protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
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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
- H04W88/02—Terminal devices
- H04W88/021—Terminal devices adapted for Wireless Local Loop operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0098—Unequal error protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L2001/125—Arrangements for preventing errors in the return channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
- H04M2207/20—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place hybrid systems
- H04M2207/206—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place hybrid systems composed of PSTN and wireless network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2242/00—Special services or facilities
- H04M2242/04—Special services or facilities for emergency applications
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- H—ELECTRICITY
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- H04M—TELEPHONIC COMMUNICATION
- H04M2242/00—Special services or facilities
- H04M2242/06—Lines and connections with preferential service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]
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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
Definitions
- the present invention relates generally to a manner by which to operate upon burst data signals received at a receiving station, such as a base station of a fixed wireless access (FWA) communication system. More particularly, the present invention relates to apparatus, and an associated method, by which to create a profile representative of expected signal characteristics of a burst data signal and of expected characteristics of the channel upon which the burst data signal is communicated.
- a receiving station such as a base station of a fixed wireless access (FWA) communication system. More particularly, the present invention relates to apparatus, and an associated method, by which to create a profile representative of expected signal characteristics of a burst data signal and of expected characteristics of the channel upon which the burst data signal is communicated.
- FWA fixed wireless access
- the profile is used at the receiving station to facilitate processing of the burst data signals received at the receiving station.
- Telecommunications access systems provide for voice, data, and multimedia transport and control between the central office (CO) of the telecommunications service provider and the subscriber (customer) premises.
- CO central office
- the subscriber Prior to the mid-1970s, the subscriber was provided phone lines (e.g., voice frequency (VF) pairs) directly from the Class 5 switching equipment located in the central office of the telephone company.
- VF voice frequency
- digital loop carrier (DLC) equipment was added to the telecommunications access architecture.
- the DLC equipment provided an analog phone interface, voice CODEC, digital data multiplexing, transmission interface, and control and alarm remotely from the central office to cabinets located within business and residential locations for approximately 100 to 2000 phone line interfaces.
- This distributed access architecture greatly reduced line lengths to the subscriber and resulted in significant savings in both wire installation and maintenance. The reduced line lengths also improved communication performance on the line provided to the subscriber.
- DLC/DSLAM wireless local loop
- WLL wireless local loop
- Wireless access systems must address a number of unique operational and technical issues including:
- wireless access systems Unlike physical optical or wire systems that operate at bit error rates (BER) of 10 "11 , wireless access systems have time varying channels that typically provide bit error rates of 10 "3 to 10 "6 .
- the wireless physical (PHY) layer interface and the media access control (MAC) layer interface must provide modulation, error correction and ARQ protocol that can detect and, where required, correct or retransmit corrupted data so that the interfaces at the network and at the subscriber site operate at wire line bit error rates.
- the base stations of a fixed wireless broadband system transmit forward channel (i.e., downstream) signals in directed beams to fixed location antennas attached to the residences or offices of subscribers.
- the base stations also receive reverse channel (i.e., upstream) signals transmitted by the broadband access equipment of the subscriber.
- reverse channel i.e., upstream
- the diversity of broadband access technology has resulted in a lack of standardization in the broadband access equipment. Cable modems and DSL routers are incompatible with each other and with fiber optic equipment. Different service providers locate broadband access equipment in different locations on the subscriber premises. Often this equipment is located inside the office or residence of the subscriber, which makes it inaccessible to maintenance workers unless the subscriber is present to admit the workers to the premises.
- the lack of standardization of broadband access equipment and the frequent inaccessibility of such equipment adds to the cost and complexity of broadband access.
- broadband access equipment that can be readily and inexpensively deployed in the large domestic and international markets that are not currently served by wired or wireless broadband access technology. Further, there is a need for an apparatus to compensate for distortion introduced upon data signals transmitted on a wireless communication channel .
- the base stations of a FWA system must be able to quickly and accurately to operate upon data bursts received from a potentially large number of subscribers .
- the present invention provides apparatus and an associated method by which to operate upon bursts data signals received at a receiving station, such as a base station of a fixed wireless access communication system.
- Characteristics of data bursts and the channels by which the data bursts are received are stored in memory as signal and channel profiles at the receiving station.
- the profiles are updated, as appropriate, and include the information required by the demodulators (typically the demodulators are contained in radio frequency (RF) modems and demodulators and modems will be referred to interchangeably hereinafter) to permit their operation to demodulate bursts of data received by the demodulators.
- RF radio frequency
- the profiles further selectably include other parameters, such as the modulation index of the data signals communicated by the subscriber stations to the base station, the modulation orthogonalizations of the bursts of data signals of the bursts of data signals, parameters associated with FEC (forward error correction) of the data bursts sent to the base station by the subscriber stations, antenna combining parameters when antenna diversity and/or beamforming is utilized, timing adjustment parameters, as well as other values.
- FEC forward error correction
- the values of the profile associated with the channel upon which the data burst is communicated are updated as appropriate.
- the updated profile is stored to be retrieved thereafter, when subsequent data bursts are received at the base station and demodulated at a demodulator thereof.
- data signals are processed at a receiving station, such as a base station in a fixed wireless access communication system.
- the data signals are transmitted to the receiving stations by any of a plurality of subscriber stations.
- Improved uplink capacity of data signals sent by the subscriber stations to the base station is possible as a result of operation of an embodiment of the present invention. Additionally, better compensation is made to counteract the effects of distortion of the data signals communicated during operation of a communication system in which an embodiment of the present invention is implemented.
- an embodiment of the present invention is implemented at the base station of a fixed wireless access communication system.
- Data bursts of data signals are communicated to the base station.
- the data bursts are generated by a plurality of subscriber stations positioned within the coverage area defined by the base station. Alternating ones of the bursts are provided to a pair of modems forming part of the receive portion of the base station.
- the modems are controlled by a controller, such as a base station central processing unit (CPU) , to control demodulation operations thereat.
- the controller maintains profiles associated with the channels wherein separate ones of the data bursts are communicated. The profiles are retrieved and values of the elements of such profiles are utilized in the demodulation of the respective data bursts.
- profile- creating apparatus and an associated method for creating at least a first profile associated with at least a first channel.
- At least a first burst data signal is transmitted in bursts upon the at least the first channel to a receiving station.
- a profile parameter determiner is coupled to receive an indication of an initial burst of the first burst data signal transmitted upon the first channel to the receiving station.
- the profile parameter determiner determines a value of at least one parameter representative of communication of the burst data signal to the receiving station.
- a profile parameter storage device is coupled to the profile parameter determiner.
- the profile parameter storage device stores values representative of the at least one parameter determined by the profile parameter determiner.
- the values stored at the profile parameter storage device are used to facilitate receive operations performed at the receiving station of subsequent bursts of the first burst data signal .
- FIGURE 1 illustrates a functional representation an exemplary fixed wireless access network according to an embodiment of the present invention
- FIGURE 2 illustrates an exemplary data frame, as defined by the fixed wireless access network in FIGURE 1, according to an embodiment of the present invention
- FIGURE 3 illustrates a functional block diagram of a portion of an embodiment the present invention comprising two modems and a controller in an embodiment of the present invention
- FIGURE 4 illustrates a high-level block diagram of the controller and one modem in the base station of FIGURE 2 if an embodiment of the present invention.
- FIGURE 5 illustrates a method flow diagram listing the method of operation of embodiment of the present invention by which to create and update a profile used to facilitate receive operations during operation of the fixed wireless access communication system.
- FIGURES 1 through 5 discussed below, and the various embodiments used to describe the principles of the present invention in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the invention. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged subscriber integrated access device.
- FIGURE 1 illustrates exemplary fixed wireless access network 100 according to one embodiment of the present invention.
- Fixed wireless network 100 comprises a plurality of transceiver base stations, including exemplary transceiver base station 110, that transmit forward channel (i.e., downlink or downstream) broadband signals to a plurality of subscriber premises, including exemplary subscriber premises 121, 122 and 123, and receive reverse channel (i.e., uplink or upstream) broadband signals from the plurality of subscriber premises.
- Subscriber premises 121-123 transmit and receive via fixed, externally-mounted antennas 131-133, respectively.
- Subscriber premises 121-123 may comprise many different types of residential and commercial buildings, including single family homes, multi-tenant offices, small business enterprises (SBE), medium business enterprises (MBE), and so-called ⁇ SOHO" (small office/home office) premises.
- SBE small business enterprises
- MBE medium business enterprises
- ⁇ SOHO small office/home office
- the cell site associated with transceiver base station 110 may be partitioned into six sectors and RF modem shelf 140 may comprise six primary RF modems (and, optionally, a seventh spare RF modem) , each of which is assigned to one of the six sectors in the cell site of transceiver base station 110.
- each RF modem in RF modem shelf 140 comprises two or more RF modem transceivers which may be assigned to at least one of the sectors in the cell site.
- the cell site associated with transceiver base station 110 may be partitioned into six sectors and RF modem shelf 140 may comprise twelve RF transceivers that are assigned in pairs to each one of the six sectors.
- RF modem shelf 140 is located proximate transceiver base station 110 in order to minimize RF losses in communication line 169.
- RF modem shelf 140 may receive the baseband data traffic from external network 150 and transmit the baseband data traffic to external network 150 via a number of different paths.
- RF modem shelf 140 may transmit baseband data traffic to, and receive baseband data traffic from, external network 150 through central office facility 160 via communication lines 166 and 167.
- communication line 167 may be a link in a publicly owned or privately owned backhaul network.
- RF modem shelf 140 may transmit baseband data traffic to, and receive baseband data traffic from, external network 150 directly via communication line 168 thereby bypassing central office facility 160.
- Central office facility 160 comprises access processor shelf 165.
- Access processor shelf 165 provides a termination of data • traffic for one or more RF modem shelves, such as RF modem shelf 140.
- Access processor shelf 165 also provides termination to the network switched circuit interfaces and/or data packet interfaces of external network 150.
- One of the principal functions of access processor shelf 165 is to concentrate data traffic as the data traffic is received from external network 150 and is transferred to RF modem shelf 140.
- Access processor shelf 165 provides data and traffic processing of the physical layer interfaces, protocol conversion, protocol management, and programmable voice and data compression. It should be noted that network 100 was chosen as a fixed wireless network only for the purposes of simplicity and clarity in explaining a subscriber integrated access device according to the principles of the present invention.
- a subscriber integrated access device may be implemented in other types of broadband access systems, including wireline systems (i.e, digital subscriber line
- Boundary 212 is a variable boundary between the uplink and downlink and system monitors and optimize these parameters adaptively and continuously by monitoring the received signal quality optimizing the operating parameters to increase the data throughput. Though only two levels of modulation are indicated in FIGURE 2 for ease of explanation, the number of ' modulations of increasing complexity is arbitrary and may be dictated by the conditions imposed by the system and/or operator.
- the base station receives a burst of data on a demand basis from the subscribers on the uplink and the base station has to process each channel.
- the system includes multiple modems connected to access processor 165 for covering the subscribers associated with each base station.
- Uplink portion 204 of data frame 200 is received by a base station modem and comprises multiple segments: contention period 214 at which access is given to the subscriber stations to communicate the data bursts of uplink data, modulation level, forward Error Correction (FEC) and power level designation from antenna (1) 216, modulation level, forward Error Correction (FEC) and power level designation from antenna (2) 218, and modulation level, forward Error Correction (FEC) and power level designation from antenna (n) 220, where n is the number of antennas transmitting from a subscriber premises.
- contention period 214 at which access is given to the subscriber stations to communicate the data bursts of uplink data
- FEC forward Error Correction
- FEC forward Error Correction
- power level designation from antenna (1) 216 modulation level, forward Error Correction (FEC) and power level designation from antenna (2) 218, and modulation level, forward Error Correction (FEC) and power level designation from antenna (n) 220, where n is the number of antennas transmitting
- FIGURE 3 illustrates a functional block diagram of a portion of the present invention comprising two modems and a controller in an embodiment of the present invention.
- Modem 302 and modem 304 are selectively coupled to receive uplink signals sent by different ones of subscriber stations to the base station (not shown) .
- IF/RF (intermediate frequency/radio frequency) receive circuitry 306 of the base station is shown to pass the uplink signals to the modems.
- Circuitry 306 is operable to down-convert in frequency uplink signals received from receive circuitry
- Modem 302 includes equalizer 303 which performs equalization functions, and modem 304 includes equalizer
- the profiles associated with the various communication channels stored at memory device 318 include weighting values 320 by which to weight equalizers 303 and 305. Values 320 are utilized to weight equalizers 303 or 305, as appropriate, when data signals sent to the base station on the corresponding channel are to be operated upon by the selected modem. As channel conditions change, changes to values 318 are calculated and stored. Other values of the profiles, while not separately shown, are analogously stored at memory device 318. Because changes in the channel condition typically vary at a rate much slower than the rate of data transmission of the uplink data signals, the update rates at which the values of the profiles need to be applied to the modems are a mere fraction of the data transmission rates.
- fading rates are typically of a level of approximately 1 to 2 Hz while frame updates of the frames are on the order of approximately 500 Hz. Updates are typically needed at approximately five to ten times the channel rate, i.e. of about 5 to 20 Hz.
- the updates are common in one implementation are made in conjunction with a status polling mechanism.
- a demand access mechanism permits scheduling of traffic bursts, i.e., bursts of uplink signals that may be anticipated to arrive from a particular subscriber station.
- a demand access burst within contention period portion 214 of uplink portion 204 of a frame is of a relatively brief duration and utilizes relatively robust FEC and modulation short orthogonalization codes when utilizing a spread spectrum arrangement.
- the modem at which the burst of the uplink data signal is to be operated cyclically adapts equalization functions performed by the equalizer.
- the demodulator portion of modem 302 or 304 operates upon the burst of data received and a resultant packet of data, here represented by the block 404, is generated in which, amongst other things, the values of the data packet have been compensated for the effects of distortion generated thereon.
- the controller 314 is here again shown to include the memory device 318 and the control CPU 316.
- the control CPU is operable to form a profile parameter determiner and updater
- the memory here forms a profile storage device.
- Updates are made to the profile as appropriate (indicated by block 406) and the updated profile is stored at the memory device of the controller.
- the updated profile is retrieved and utilized when the subsequent burst of data is to be operated upon by the modem. Compensation for distortion introduced on the uplink data signal is improved because the profile was updated as the data signal's channel conditions changed.
- Cyclo-stationary adaptive filtering is performed upon the uplink data burst signal.
- CSAF is a signal processing technique to allow adaptive filters to operate in environments that exhibit cyclic/deterministic channel environments.
- Each burst of the data signal transmitted by a subscriber station forms a separate,, and distinct stationary channel environment.
- Each of the channels is processed by configuring the receive portion of the base station with a matched filter forming the equalizer, such as equalizers 303 and 305 (shown in FIGURE 3) for the specific channel.
- equalizers 303 and 305 shown in FIGURE 3
- Figure 5 illustrates a method flow diagram, shown generally at 500, of a method by which to create, and update, profiles associated with signal characteristics of burst data signals communicated to a base station and the channel characteristics of the channels upon which the burst data signals are transmitted.
- the speed and accuracy of the operations performed upon the bursts of the burst signal data are improved.
- a subscriber station transmits a burst of a burst data signal to the base station which serves the cell, or the cell sector, in which the subscriber station is positioned.
- the burst is applied to an RF modem located at the base station, as indicated by the block 502. If the burst is an initial burst communicated during a contention period a path is taken to the block 504 at which operations are performed upon the burst to determine the parameters associated with the burst as well as determinations of the channel characteristics of the channel upon which the burst was transmitted.
- the parameters include, for instance, signal- related parameters and channel-related parameters.
- Signal- related parameters include, for instance, the amount of forward error correction ' (FEC) of the burst, change in frequency of the burst, changes in time of the burst, changes in power levels of the burst, etc.
- channel- related parameters include values of equalization weighting, antenna parameters, either at the subscriber station or at the base station, etc. .
- the calculated parameters are stored, indicated by the block 506, and the stored parameters form the initial profile to be used to perform receive operations upon the burst of the burst of data signal.
- cyclo- stationary adaptive filtering is performed upon subsequent bursts of the burst of the data signal to update the values of the calculated parameters responsive to calculations performed upon subsequent bursts of the burst data signal during the contention period.
- a profile is created, stored in memory, and updated if appropriate.
- the profile is thereafter provided to an RF modem, indicated at the block 510, to facilitate receive operations performed upon subsequent bursts of the burst data signal during scheduled transmission of the bursts.
- Another path extending from the block 502 extends to the block 512 to indicate that during scheduled transmissions of bursts of the burst data signal, additional cyclo-stationary adaptive filtering is performed upon the bursts, also to update the profiles created, and stored in memory.
- two separate modems are utilized to demodulate separate bursts of uplink data signals.
- alternating ones of the modems are utilized to demodulate successive bursts of data.
- values associated with another channel upon which data is expected to be subsequently transmitted is applied to the unused modem. Thereby, when the subsequent burst of data is received at the base station, the modem is immediately operable to operate upon the burst of the uplink data signal.
- different types of modems operable upon different types of signals form the separate modems.
- the signal burst is applied to the modem which is capable of operating upon the particular signal.
- Modem-types are upgradeable while maintaining the backward compatibility of the base station. Additional modems are added, as needed, thereby to permit continued operation of the base station as new types of technology are made available.
- additional profile values include, for instance, the modulation index of the uplink data signal, the modulation orthogonalization thereof, parameters associated with forward error correction of the uplink data signal, antenna combining parameters when antenna diversity and/or beamforming is utilized, and residual carrier or baud timing adjustments.
- a manner is provided by which to operate upon data signals received at a receiving station, such as a base station of a fixed wireless access communication system.
- the distortion introduced upon the data signals during their communication upon non-ideal communication channels is better compensated for, thereby permitting improved quality of communications as well as increased throughput rates to increase the capacity of the communication system.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2002219441A AU2002219441A1 (en) | 2001-01-19 | 2002-01-18 | Apparatus and method for creating signal and channel profiles at a receiving station |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US26282701P | 2001-01-19 | 2001-01-19 | |
US60/262,827 | 2001-01-19 | ||
US09/839,719 | 2001-04-20 | ||
US09/839,719 US6947477B2 (en) | 2001-01-19 | 2001-04-20 | Apparatus and method for creating signal and profiles at a receiving station |
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WO2002058409A2 true WO2002058409A2 (en) | 2002-07-25 |
WO2002058409A3 WO2002058409A3 (en) | 2002-11-21 |
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PCT/IB2002/000136 WO2002058409A2 (en) | 2001-01-19 | 2002-01-18 | Apparatus and method for creating signal and channel profiles at a receiving station |
Country Status (3)
Country | Link |
---|---|
US (1) | US6947477B2 (en) |
AU (1) | AU2002219441A1 (en) |
WO (1) | WO2002058409A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090111457A1 (en) | 2007-10-31 | 2009-04-30 | Raze Technologies, Inc. | Wireless communication system and device for coupling a base station and mobile stations |
US7346347B2 (en) | 2001-01-19 | 2008-03-18 | Raze Technologies, Inc. | Apparatus, and an associated method, for providing WLAN service in a fixed wireless access communication system |
US20030099218A1 (en) * | 2001-11-29 | 2003-05-29 | Tillotson Brian Jay | Apparatus and method for improving noise tolerance of TDMA links |
US7369491B1 (en) * | 2003-05-14 | 2008-05-06 | Nortel Networks Limited | Regulating data-burst transfer |
KR100690608B1 (en) * | 2004-12-07 | 2007-03-09 | 엘지전자 주식회사 | Method for selecting channel in wireless communication apparatus |
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WO1996034481A2 (en) * | 1995-04-28 | 1996-10-31 | Ionica International Limited | Adaptive filter for use in a tdm/tdma receiver |
EP0800285A2 (en) * | 1996-04-04 | 1997-10-08 | Siemens Aktiengesellschaft | Method for adjusting the parameters of a receiving apparatus, as well as corresponding receiving apparatus and radio station |
WO1999031837A1 (en) * | 1997-12-12 | 1999-06-24 | Thomson Licensing S.A. | Tdma wireless telephone system with independently tracked demodulation parameters |
US5978650A (en) * | 1997-01-21 | 1999-11-02 | Adc Telecommunications, Inc. | System and method for transmitting data |
Family Cites Families (10)
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WO1998010555A2 (en) * | 1996-09-02 | 1998-03-12 | Telia Ab (Publ) | Improvements in, or relating to, multi-carrier transmission systems |
US5793753A (en) * | 1996-09-17 | 1998-08-11 | Coherent Communications Systems Corp. | Telecommunications network management observation and response system |
US5832365A (en) * | 1996-09-30 | 1998-11-03 | Lucent Technologies Inc. | Communication system comprising an active-antenna repeater |
US6590872B1 (en) * | 1997-12-12 | 2003-07-08 | Thomson Licensing S.A. | Receiver with parallel correlator for acquisition of spread spectrum digital transmission |
US6345071B1 (en) * | 1998-07-24 | 2002-02-05 | Compaq Computer Corporation | Fast retrain based on communication profiles for a digital modem |
US6230326B1 (en) * | 1998-07-30 | 2001-05-08 | Nortel Networks Limited | Method and apparatus for initialization of a cable modem |
US6222858B1 (en) * | 1999-02-10 | 2001-04-24 | Verizon Laboratories Inc. | Method of inverse multiplexing for ATM |
US6636490B1 (en) * | 1999-07-12 | 2003-10-21 | Nortel Networks Limited | Self-installation of wireless access network terminals |
US6654384B1 (en) * | 1999-12-30 | 2003-11-25 | Aperto Networks, Inc. | Integrated self-optimizing multi-parameter and multi-variable point to multipoint communication system |
US6987754B2 (en) * | 2000-03-07 | 2006-01-17 | Menashe Shahar | Adaptive downstream modulation scheme for broadband wireless access systems |
-
2001
- 2001-04-20 US US09/839,719 patent/US6947477B2/en not_active Expired - Lifetime
-
2002
- 2002-01-18 WO PCT/IB2002/000136 patent/WO2002058409A2/en not_active Application Discontinuation
- 2002-01-18 AU AU2002219441A patent/AU2002219441A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1996034481A2 (en) * | 1995-04-28 | 1996-10-31 | Ionica International Limited | Adaptive filter for use in a tdm/tdma receiver |
EP0800285A2 (en) * | 1996-04-04 | 1997-10-08 | Siemens Aktiengesellschaft | Method for adjusting the parameters of a receiving apparatus, as well as corresponding receiving apparatus and radio station |
US5978650A (en) * | 1997-01-21 | 1999-11-02 | Adc Telecommunications, Inc. | System and method for transmitting data |
WO1999031837A1 (en) * | 1997-12-12 | 1999-06-24 | Thomson Licensing S.A. | Tdma wireless telephone system with independently tracked demodulation parameters |
Also Published As
Publication number | Publication date |
---|---|
AU2002219441A1 (en) | 2002-07-30 |
US6947477B2 (en) | 2005-09-20 |
US20020097685A1 (en) | 2002-07-25 |
WO2002058409A3 (en) | 2002-11-21 |
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