CN100557988C - Reduce the wireless communication system of frequency repeat utilization ratio - Google Patents
Reduce the wireless communication system of frequency repeat utilization ratio Download PDFInfo
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- CN100557988C CN100557988C CNB2005100807257A CN200510080725A CN100557988C CN 100557988 C CN100557988 C CN 100557988C CN B2005100807257 A CNB2005100807257 A CN B2005100807257A CN 200510080725 A CN200510080725 A CN 200510080725A CN 100557988 C CN100557988 C CN 100557988C
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
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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
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03305—Joint sequence estimation and interference removal
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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
- 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
Abstract
The present invention relates to a kind of receiver and communication system that reduces frequency repeat utilization ratio.Described receiver is a kind of simple interference suppressing receiver or many decoding units interference suppressing receiver, comprise that signal processing unit suppresses and offset unit with disturbing, described signal processing unit is used for each the road signal that receives is carried out demodulation, separates mapping and channel-decoding processing; Described interference inhibition and offset unit are used for each the road interference between signals that receives is suppressed and offsets processing.Base station in the described communication system or subscriber station comprise described simple interference suppressing receiver or many decoding units interference suppressing receiver.Realization of the present invention can effectively overcome existing kind of co-channel interference, effectively shortens multiplex distance, reduces frequency repeat utilization ratio, increases honeycomb system capacity.Even all sub-districts of cellular system can only use with a kind of frequency, need not the complicated network planning and power control techniques.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of wireless communication system that reduces frequency repeat utilization ratio.
Background technology
Verified in theory, adopt a plurality of transmitting antennas to be divided into a plurality of parallel narrow band channels to wireless channel, have the potential that improves the channel bit transfer rate, and result of study shows that channel capacity increases and linear the increase with antenna amount.Compare with smart antenna with receive diversity, MIMO (multiple-input and multiple-output) system not only can provide diversity gain and array gain, and can adopt the mode of SDM (spatial reuse) to improve power system capacity.
BLAST is a kind of approach that adopts space multiplexing technique raising bandwidth availability in the radio communication, structure when being called dblast.The BLAST system utilizes a plurality of antennas to send parallel data flow simultaneously in same frequency range, and utilize the abundant different data flow of multipath transmisstion, and can separate at receiver, thus the space diversity of obtaining.
The principle of BLAST as shown in Figure 1.A plurality of transmitters adopt identical modulation system, and a plurality of receivers also adopt identical demodulation mode.BLAST is divided into a plurality of son streams to the data flow of unique user, and utilizes a plurality of antennas to send these parallel son stream simultaneously, and all son streams send in same frequency band, so the frequency spectrum service efficiency is very high.Desired data has a plurality of copies to enter channel (transmitting antenna), and a plurality of outputs (reception antenna) are arranged simultaneously.At receiver end, a plurality of antennas are picked out a plurality of substream of data and the scattering copy thereof that sends, each reception antenna receives all substream of data that send that are superimposed, and can utilize complicated signal processing technology, the difference by these subchannels can mask data stream and is detected.
Because transmitter still is the antenna number of receiver all is limited, therefore increasing diversity gain and improving emission rate is a pair of contradiction.STC (empty time-code) and SFC (empty sign indicating number frequently) can solve this contradiction preferably.The space diversity that empty time-code has utilized multiaerial system to provide, its performance depends on the antenna number and the coding of signal on room and time of system, comprises Space-Time Block Coding and space-time grid code.Non-multipath channel condition has all been supposed in the design of these yards, belongs to the arrowband sign indicating number, and maximum obtainable diversity gain equals the product of number of transmit antennas and reception antenna number.
Under the multipath channel condition of broadband, the performance of empty time-code is not best, because it has only utilized space diversity, and fails the channel frequency diversity of utilizing multipath to provide.Therefore, studying under the multi-path environment, based on the encoded question of the multiaerial system of OFDM (OFDM), the notion of empty frequency sign indicating number has been proposed, the potential diversity gain that can realize of these yards is the product of number of transmit antennas, reception antenna number and channel impulse response length (channel multi-path number).
From the coherence time and the coherence bandwidth of fading channel, empty time-code require a code block crossing over several OFDM characters in the cycle channel fading keep approximate constant time response, promptly be the bigger the better coherence time; And empty sign indicating number frequently requires the channel fading frequency response of a code block of the several subcarriers of leap to keep approximate constant, and promptly coherence bandwidth is the bigger the better.On constraints, empty time-code has better performance in flat fading channel, and empty sign indicating number frequently has better performance in fast fading channel.But in fact, transmitter can't be predicted channel condition information, can integrate empty time-code and the empty advantage of sign indicating number frequently for this reason, proposes STFC (space-time frequency code) scheme, on spatial domain, time-domain and frequency domain, unite consideration, thereby realized the maximum diversity gain under many antennas fading channel.
Based on above-mentioned space-time/space-frequency/empty time-frequency/spatial reuse encoding process technology, the structure of the transmitter and receiver of using in the wireless communication system in the prior art such as Fig. 6 are to shown in Figure 15, for need adopting different frequencies to send, to avoid co-channel interference to the transmitter of same receiver transmission signal.
In cellular system, because frequency resource is limited, channeling is the effective means that improves frequency efficiency.In cellular system based on channeling, adjacent with adopting the sub-district of different frequency to cover by gang between BS (base station) frequently, represent the number of channeling family sub-district (being the sub-district of described employing different frequency) with N.Supposing the system has K frequency, and in this channeling family, J frequency (J＜K), then have is got in each sub-district
The K=JN=constant.
If this channeling family repeats M time in certain region, then the power system capacity C of this region is:
C＝MK。
Power system capacity C and M are directly proportional, and M then is inversely proportional to N.If can optimize the N minimum during network planning, honeycomb system capacity maximum then.
Frequency repeat utilization ratio q is defined as: q=D/R=(3N)
1/2
In the formula, D is a frequency reuse distance, is adjacent with the distance between the frequency base station; R is a radius of society.
As seen, honeycomb system capacity is determined by frequency repeat utilization ratio q.
Channeling must cause mutual interference, i.e. co-channel interference.Adjacent q is more little for frequency repeat utilization ratio with the distance D between the base station is near more frequently, and honeycomb system capacity is big more, and frequency efficiency is high more, but co-channel interference is also big more.Co-channel interference mainly contains jamming pattern in 4, and is extremely shown in Figure 5 as Fig. 2.Wherein, BS is the base station, and SS is a subscriber station; TX represents sending module, and RX represents receiver module; And supposing that SS1 belongs to BS1, SS2 belongs to BS2.
The size of interference power depends on ERP, multiplex distance and path attenuation.In existing cellular system, adopt complicated power control techniques usually, to reduce co-channel interference.Therefore, prior art need be carried out the complicated network planning, and needs complicated power control techniques.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of wireless communication system that reduces frequency repeat utilization ratio, thereby can effectively reduce the co-channel interference in the wireless communication system, simplify network planning scheme.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of receiver that reduces frequency repeat utilization ratio, comprising:
One group of received antenna: be used to receive each road signal;
Disturb to suppress and offset unit: be used for each road interference between signals that a described group of received antenna receives is suppressed and offsets processing;
Signal processing unit: be used for the signal of described interference inhibition and offset unit output is carried out channel-decoding, symbol de-maps and demodulation process;
Described interference inhibition and offset unit comprise:
One group is disturbed inhibition and offsets subelement: comprise that the interference identical with the received signal way suppresses and the counteracting subelement, be arranged between the demodulator and a described group of received antenna of described signal processing unit, and be respectively applied for each road signal handled before demodulation and obtain each separate road received signal, described each disturbs and suppresses and offset to be series connection successively between the subelement, and its input signal way reduces last road signal that obtains received signal of handling successively;
Perhaps,
One is disturbed inhibition and offsets subelement: be arranged between the demodulator and a described group of received antenna of described signal processing unit, be used for each the road signal that receives is handled before demodulation, and directly export one tunnel effective signal.
The receiver of described reduction frequency repeat utilization ratio also comprises the space-time/space-frequency corresponding with transmitter terminal/empty time-frequency/spatial reuse decoding unit: be used for carrying out to received signal space-time/space-frequency/empty time-frequency/spatial reuse decoding processing.
Described signal processing unit also comprises:
Separate the mapping processing module: be used for handling to separating mapping through the signal after the described demodulator demodulation process;
Decoder: be used for to carrying out the channel-decoding processing through the signal of separating after mapping is handled.
Described receiver also comprises:
The signal selected cell is connected with the output of described signal processing unit, be used for from receive and select one road signal as effective received signal through the signal after the respective handling.
Described interference inhibition and offset unit are to set up based on maximum likelihood ML decoding, linear algorithm decoding or nonlinear algorithm decoding to be provided with.
The present invention also provides a kind of wireless communication system that reduces frequency repeat utilization ratio, the receiver that comprises transmitter and reduction frequency repeat utilization ratio, transmitter will send by transmitting antenna through the signal of chnnel coding, sign map and modulation treatment, described receiver receives the signal that described transmitter sends by a group of received antenna that is provided with, and signal carried out channel-decoding, symbol de-maps, demodulation and disturb suppressing and offsetting and handle, obtain received signal;
A described group of received antenna: be used to receive each road signal;
Signal processing unit: be used for the received signal of a described group of received antenna is carried out channel-decoding, symbol de-maps and demodulation process;
Disturb to suppress and offset unit: be used for each the road interference between signals that receives is suppressed and offsets processing;
Described interference inhibition and offset unit comprise:
One group is disturbed inhibition and offsets subelement: comprise that the interference identical with the received signal way suppresses and the counteracting subelement, be arranged between a decoder and the described group of received antenna, and be respectively applied for each road signal handled before demodulation and obtain each separate road received signal, described each disturbs and suppresses and offset to be series connection successively between the subelement, and its input signal way reduces last road signal that obtains received signal of handling successively;
Perhaps,
One is disturbed inhibition and offsets subelement: be arranged between a demodulator and the described group of received antenna, be used for each the road signal that receives is handled before demodulation, and directly export one tunnel effective signal.
Described transmitter comprises at least two, and described receiver disturbs the two paths of signals at least that receives and suppresses and the counteracting processing.
Described each transmitter comprises based on single coding unit transmitter of bit-level and/or based on single coding unit transmitter of symbol level, and the corresponding setting with each transmitter architecture of described receiver side structure.
Described receiver comprises:
Based on the simple interference suppressing receiver of bit-level or many decoding units interference suppressing receiver, many decoding units interference suppressing receiver of mixing, mix and mix based on bit-level and symbol level based on symbol level based on the simple interference suppressing receiver of symbol level or many decoding units interference suppressing receiver, based on bit-level.
The wireless communication system of described reduction frequency repeat utilization ratio comprises base station and subscriber station, and,
Base station transmitter adopts general transmit machine or single coding unit transmitter, while or timesharing send between the different base stations, receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, subscriber station transmitter adopts general transmit machine or single coding unit transmitter, and subscriber station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver;
Perhaps,
The base station adopts base station transmitter to adopt general transmit machine or single coding unit transmitter, timesharing sends between the different base stations, receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, subscriber station transmitter adopts general transmit machine or single coding unit transmitter, and subscriber station receiver adopts common receiver or single decoding unit receiver;
Perhaps,
Base station and subscriber station transmitter adopt general transmit machine or single coding unit transmitter, and base station and subscriber station receiver adopt common receiver or single decoding unit receiver, and timesharing sends and the timesharing reception between the different base stations.
Described single coding unit transmitter comprises:
Signal sends processing unit: be used for signal is carried out chnnel coding, sign map and modulation treatment;
Space-time/space-frequency/empty time-frequency/spatial reuse coding unit: be used for before the channel encoding process, perhaps the signal after chnnel coding, sign map or the modulation treatment carries out space-time/space-frequency/empty time-frequency/spatial reuse encoding process.
As seen from the above technical solution provided by the invention, realization of the present invention can effectively overcome existing kind of co-channel interference, effectively shortens multiplex distance, reduces frequency repeat utilization ratio, increases honeycomb system capacity.Even all sub-districts of cellular system can only use with a kind of frequency, need not the complicated network planning and power control techniques.
That is to say that realization of the present invention can improve the availability of frequency spectrum exponentially under the situation that does not increase bandwidth and antenna transmission power, and then improve capability of wireless communication system.
Description of drawings
Fig. 1 is the schematic diagram of BLAST;
Fig. 2 to Fig. 5 is four kinds of co-channel interference scene schematic diagrames of the prior art;
Fig. 6 is a general transmit machine of the prior art;
Fig. 7 is a common receiver of the prior art; Fig. 8 to Figure 11 is four kinds of single coding unit transmitters of the prior art;
Figure 12 to Figure 15 is four kinds of single decoding unit receivers of the prior art;
Figure 16 is the simple interference suppressing receiver of source bits level provided by the invention;
Figure 17 is the superfine simple interference suppressing receiver of channel ratio provided by the invention;
Figure 18 is the simple interference suppressing receiver of source symbol level provided by the invention;
Figure 19 is the simple interference suppressing receiver of channel symbol level provided by the invention;
Figure 20 is the superfine simple interference suppressing receiver of another kind of channel ratio provided by the invention;
Figure 21 is many decoding units of source bits level interference suppressing receiver provided by the invention;
Figure 22 is the superfine many decoding units interference suppressing receiver of channel ratio provided by the invention;
Figure 23 is many decoding units of source symbol level interference suppressing receiver provided by the invention;
Figure 24 is many decoding units of channel symbol level interference suppressing receiver provided by the invention;
Figure 25 is that channel ratio superfine provided by the invention and source symbol level are mixed many decoding units interference suppressing receiver;
Figure 26 is another kind of many decoding units of source symbol level interference suppressing receiver provided by the invention;
Figure 27 is for disturbing structural representation Fig. 1 of inhibition and offset unit;
Figure 28 is for disturbing structural representation Fig. 2 of inhibition and offset unit;
Figure 29 is a wireless communication system architecture schematic diagram 1 provided by the invention;
Figure 30 is a wireless communication system architecture schematic diagram 2 provided by the invention;
Figure 31 is a wireless communication system architecture schematic diagram 3 provided by the invention;
Figure 32 is a wireless communication system architecture schematic diagram 4 provided by the invention;
Figure 33 is a wireless communication system architecture schematic diagram 5 provided by the invention.
Figure 34 is the structural representation based on the transmitter of the BS1 of empty time-code;
Figure 35 is the structural representation based on the transmitter of the BS2 of empty time-code;
Figure 36 is the structural representation based on the receiver of the SS1 of empty time-code;
Figure 37 is the structural representation based on the receiver of the SS2 of empty time-code.
Embodiment
Core of the present invention is to utilize MIMO and blending space technology (for example, the combination of layering spatial reuse sign indicating number, empty time-code, empty sign indicating number frequently or space-time frequency code), can overcome described 4 kinds of co-channel interferences, effectively shorten multiplex distance, reduce frequency repeat utilization ratio, improve frequency efficiency, increase honeycomb system capacity.Even all sub-districts of cellular system can only use with a kind of frequency, need not the complicated network planning and power control techniques.
Relate to general transmit machine, common receiver, single coding unit transmitter, single coding unit receiver, simple interference suppressing receiver and many decoding units interference suppressing receiver in the wireless communication system of the reduction frequency repeat utilization ratio that the present invention states, will describe respectively below.
(1) structure of described general transmit machine specifically comprises as shown in Figure 6:
Signal sends processing unit, is used for carrying out chnnel coding, sign map and modulation treatment to sending signal, and is sent by transmitting antenna;
(2) structure of described common receiver specifically comprises as shown in Figure 7:
Signal processing unit is used for the received signal of reception antenna is carried out channel-decoding, symbol de-maps and demodulation process;
(3) structure of described single coding unit transmitter is as shown in Figs. 8 to 11, specifically comprises:
Space-time/space-frequency/empty time-frequency/spatial reuse coding unit is used for source signal is carried out space-time/space-frequency/empty time-frequency/spatial reuse coding, forms Ti bar transmitting branch;
Signal sends processing unit, is used for carrying out chnnel coding, sign map and modulation treatment to sending signal, and sends;
Press the difference of the position of encoder placement, the single coding unit transmitter based on bit-level can be arranged, as Fig. 8 and shown in Figure 9, based on single coding unit transmitter of symbol level, as shown in Figure 10 and Figure 11; The coding least unit of bit-level encoder is a bit, and the coding least unit of symbol level encoder is a symbol, and for example, the coding least unit can be the symbol after the qam symbol mapping among Figure 10; The coding least unit can be the OFDM symbol after the OFDM modulation among Figure 11.
For different transmitting branch, can adopt channel coding method, sign map mode and the modulation system (for example OFDM modulation, OFDMA modulation or band spectrum modulation) of model identical or different mode;
(4) single decoding unit receiver, specifically comprises to shown in Figure 15 as Figure 12:
Signal processing unit is used for different receiving branchs, adopts channel-decoding mode, symbol de-maps mode and the demodulation mode of model identical or different mode, for example OFDM demodulation, OFDMA demodulation or spread spectrum demodulation;
Press the difference of decoder placement location, the single decoding unit receiver based on bit-level can be arranged, as Figure 12 and Figure 13, based on single decoding unit receiver of symbol level, as Figure 14 and Figure 15; The decoding least unit of bit-level decoder is a bit, and the decoding least unit of symbol level decoder is a symbol, and for example, the decoding least unit can be for separating mapping symbol before among Figure 14 through qam symbol; The coding least unit can be the OFDM symbol before the OFDM demodulation among Figure 15.
Above-mentioned transmitter and receiver is a transmitter and receiver of the prior art.
(5) for simple interference suppressing receiver, this receiver is a receiver provided by the invention,, specifically comprises to shown in Figure 20 as Figure 16:
Signal processing unit has Rq reception antenna, receives the different branch signal, and adopts channel-decoding mode, symbol de-maps mode and the demodulation mode of model identical or different mode, for example OFDM demodulation, OFDMA demodulation or spread spectrum demodulation;
Interference suppresses and offset unit, the q bar is decoded prop up road combined disturb inhibition and counteracting, obtains the received signal after inhibition and counteracting are disturbed in the q road, or obtains the received signal after one-way interference inhibition and the counteracting, as shown in figure 20.
According to disturbing the different of inhibition and offset unit placement location, the simple interference suppressing receiver based on bit-level can be arranged, as Figure 16, Figure 17 or Figure 20, based on the simple interference suppressing receiver of symbol level, as Figure 18 or Figure 19.
The signal selected cell, be used for when after each cell processing of above-mentioned receiver, if obtain be the q road disturb to suppress and offset after received signal, then from the received signal of q road, select one road signal as useful received signal, do not limit among concrete selection mode the present invention; If obtain be one-way interference suppress and offset after received signal, then need not this signal selected cell.
(6) for many decoding units interference suppressing receiver, this receiver is a receiver provided by the invention,, specifically comprises to shown in Figure 26 as Figure 21:
Signal processing unit, R=R1+...+Ri+...+Rq reception antenna arranged, receive the different branch signal, and adopt channel-decoding mode, symbol de-maps mode and the demodulation mode of model identical or different mode, for example OFDM demodulation, OFDMA demodulation or spread spectrum demodulation;
With the corresponding space-time/space-frequency/empty time-frequency/spatial reuse decoding unit that is provided with of emission pusher side, q space-time/space-frequency/empty time-frequency/spatial reuse decoding unit specifically can be arranged, each decoding unit is corresponding R1 respectively, ..., Ri ..., Rq reception antenna forms q bar decoding branch road; Can be that all decoding branch roads all adopt a kind of trellis decode or packet decoding, also can be that part decoding branch road adopts trellis decode, and another part decoding receiving branch adopts packet decoding; When the received signal of decoding i decoding branch road, other decoding tributary signal is counted as interference signal and handles.The space-time/space-frequency of receiver/empty time-frequency decoder needs the channel estimating of MIMO (multiple-input and multiple-output), MISO (the single output of many inputs) or SIMO (the many outputs of single input).
Difference according to this decoding unit placement location, many decoding units interference suppressing receiver based on bit-level can be arranged, as Figure 21 or Figure 22, many decoding units interference suppressing receiver based on symbol level, as Figure 23, Figure 24 or Figure 26, mix, mix the many decoding units interference suppressing receiver that reaches based on bit-level (information source or signal) and symbol level (information source or signal) mixing based on source symbol level and channel symbol level, based on source bits level and channel ratio superfine as Figure 25; The decoding least unit of bit-level decoder is a bit, and the decoding least unit of symbol level decoder is a symbol, and for example, the decoding least unit can be for separating mapping symbol before among Figure 23 through qam symbol; The coding least unit can be the OFDM symbol before the OFDM demodulation among Figure 24.
Disturb and suppress and offset unit, be positioned at after space-time/space-frequency/empty time-frequency/spatial reuse decoding unit, not necessarily following closely, q bar decoding road combined an interference is suppressed and counteracting, obtain the received signal after inhibition and counteracting are disturbed in the q road, or obtain that one-way interference suppresses and offset after received signal, as shown in figure 26.
The signal selected cell, be used for when after each cell processing of above-mentioned receiver, if obtain be the q road disturb to suppress and offset after received signal, then from the received signal of q road, select one road signal as useful received signal, do not limit among concrete selection mode the present invention; If obtain be one-way interference suppress and offset after received signal, then need not this signal selected cell.
For described interference inhibition and offset unit, in theory, can adopt ML (maximum likelihood) decoding can obtain maximum space diversity degree (for Ri), but its decoding complexity is big.Also can adopt the algorithm of suboptimum: comprise linear algorithm, as ZF (ZF) algorithm and least mean-square error (MMSE) algorithm etc., and nonlinear algorithm, as SUC (SUccessive Cancellation, a kind of cancellation algorithms one by one), OSUC (Ordered SUccessive Cancellation, another kind is cancellation algorithms one by one), be ZF V-BLAST (structure during the ZF dblast), etc.Linear algorithm decoding complexity wherein is low, owing to do not make full use of the useful information in the received signal, getable order of diversity has only Ri-Ti+1, far below method ML method, and characteristic relatively poor (though the performance of MMSE is good than ZF) when empty.Though the characteristic of nonlinear method is not as the ML method, its decoding complexity is significantly less than the ML method, has done good compromise between performance and complexity.In nonlinear method, the performance of SUC is only slightly good than linear method, and OSUC is far superior to linear method.
Suppose to have q road information source x
1..., x
q, wherein effectively information source is x
i, i.e. the receiver echo signal that really will receive.The structure of then described interference inhibition and offset unit can adopt structure as shown in figure 27, disturbs inhibition and offset unit that input r in q road is arranged
1..., r
q, respectively from reception antenna 1 ..., q then disturbs inhibition and offset unit to disturb inhibition and counteracting subelement to form by the q layer; Wherein, the 1st floor disturbs inhibition and offsets subelement and be responsible for by q road input r
1..., r
q, in solve information source x
qEstimated signal x^
q, and with the reception of reception antenna q contribution from reception antenna 1 ..., deduct in the received signal of q, remaining signal disturbs as the 2nd layer and suppresses and offset subelement.The 2nd, the ..q layer disturbs inhibition and offsets subelement and repeat above-mentioned the 1st layer of interference inhibition and offset the processing procedure of subelement, finally obtains information source x
1..., x
qEstimated signal x^
1..., x^
q, select echo signal x^ by signal selected cell thereafter then
i
The present invention can also adopt another kind of disturb suppress and the structure of offset unit as shown in figure 28, disturb and suppress and offset unit has the q road to import r
1..., r
q, respectively from reception antenna 1 ..., q then disturbs inhibition and offset unit only to disturb inhibition and counteracting subelement to form by 1 layer; The 1st floor disturbs inhibition and offsets subelement and be responsible for by q road input r
1..., r
qIn, directly select to solve to effective information source x
iTarget estimated signal x^
iThis structure has only single channel to receive the processing branch road after disturbing inhibition and offset unit, branch road is handled in the follow-up reception of having avoided needing the q road after going up a kind of structure interference inhibition and offset unit, and need not disturbing inhibition and offset unit signalization selected cell afterwards.
With above-mentioned each transmitter and receiver, especially simple interference suppressing receiver and many decoding units interference suppressing receiver are at wireless communication system below, and promptly the example that is applied as in base station and the subscriber station system describes.
First kind of implementation such as Figure 29 and shown in Figure 30:
This scheme is applicable to TDD and FDD mode; For the TDD mode, send synchronous hypothesis based on each mode network.
Base station transmitter adopt as shown in Figure 6 the general transmit machine or Fig. 8 to single coding unit transmitter shown in Figure 11, and base station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver; Subscriber station transmitter adopt as shown in Figure 6 the general transmit machine or single coding unit transmitter of Fig. 8 to Figure 11, and subscriber station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver.With TDD is example, referring to Figure 29 and Figure 30, does not have the situation of Figure 29 under FDD; Wherein, t0, t1, tr, tk represent the different moment with tk+1 in each width of cloth accompanying drawing; TX represents sending module, and RX represents receiver module; BS is the base station, and SS is a subscriber station, and supposes that SS1 belongs to BS1, and SS2 belongs to BS2; DL is a downlink frame, and UL is a uplink frame; Figure 29 is the system schematic that overcomes Fig. 2 and interference shown in Figure 3, and Figure 30 is the system schematic that overcomes Fig. 4 and interference shown in Figure 5.
Second kind of implementation such as Figure 31 and shown in Figure 32:
This scheme sends synchronous hypothesis based on each mode network, is applicable to the TDD mode.
Base station transmitter adopt as shown in Figure 6 the general transmit machine or Fig. 8 to single coding unit transmitter shown in Figure 11, and base station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, and the different base station timesharing sends; Subscriber station transmitter adopt as shown in Figure 6 the general transmit machine or Fig. 8 to single coding unit transmitter shown in Figure 11, and subscriber station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver.
Referring to Figure 31 and shown in Figure 32: Figure 31 is the system schematic that overcomes Fig. 2 and interference shown in Figure 3, and Figure 32 is the system schematic that overcomes Fig. 4 and interference shown in Figure 5.
The third implementation is as shown in figure 33:
This scheme is applicable to TDD and FDD mode; For the TDD mode, based on the synchronous hypothesis of each mode network transmitting-receiving.
General transmit machine shown in Figure 6 or single coding unit transmitter as shown in Figs. 8 to 11 are adopted in the base station, and base station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, and the different base station timesharing sends; Subscriber station adopt as shown in Figure 6 the general transmit machine or Fig. 8 to single coding unit transmitter shown in Figure 11 and common receiver shown in Figure 7 or Figure 12 to single decoding unit receiver shown in Figure 15.
With TDD is example, referring to Figure 24, for overcoming the system schematic of Fig. 2 and interference shown in Figure 3.Because each mode network transmitting-receiving synchronously, can not introduce Fig. 4 and interference shown in Figure 5.
Be example with empty time-code more below, with a concrete example explanation specific implementation of the present invention.
Embodiment specifically comprises shown in Figure 34,35,36 and 37:
Empty time-code is primarily aimed at flat fading channel, and the characteristic of channel is generally frequency selective fading in actual high speed data transmission system.OFDM (OFDM) technology can be divided into a plurality of parallel relevant flat fading channels to frequency selective fading channels, thereby presents non-frequency selective fading on each carrier wave.One embodiment of the present of invention are used for ofdm system with the combination of empty time-code and orthogonal frequency division multiplexi.
Suppose adjacent frequency base station BS 1 and BS2 together, subscriber station SS1 belongs to BS1, and SS1 is subjected to the interference of BS2.The ofdm system of the simple empty time-code technology that receives based on double-antenna transmit diversity, single antenna is as Figure 16 and shown in Figure 180.At each transmission end of base station 2 transmit antennas are arranged, be at least λ/2 (λ is a wavelength) apart, promptly send process that signal propagates in different paths kind and should be able to be thought separate attenuation process by approximate, at the subscriber station receiving terminal 2 reception antennas are arranged, decoder needs the channel estimating of multiple-input and multiple-output (MIMO) during this scheme receiver empty.
Information source 1 (or information source 2) is by chnnel coding/sign map, and then through the simple Space Time Coding of symbol level, respectively through the OFDM modulation, last transmitting antenna 1 and 2 (transmitting antenna or 3 and 4) sends the two paths of signals of output again.
The received signal of subscriber station 1 receiver two-way antenna is passed through the OFDM demodulation respectively, the two-way ofdm signal of output is decoding when the simple sky of symbol level respectively, suppress and offset unit through disturbing again, export pure BS1 signal and pure BS2 signal, do channel-decoding/symbol de-maps then respectively, select to obtain the BS1 signal at last.Subscriber station 2 receiver structures are then more succinct, the two-way received signal is passed through the OFDM demodulation respectively, the two-way ofdm signal of output is decoding when the simple sky of symbol level respectively, suppress and offset unit through disturbing again, directly the pure BS2 signal of output is done channel-decoding/symbol de-maps then and is obtained the BS2 signal.
At each receiving branch, linear merging when decoder carries out sky to received signal by following formula when empty, acquisition Ti * Ri (Ti=2 in this example, Ri=1) diversity order:
Wherein, h
IjBe the channel coefficients of transmitting antenna j, be the result of the channel estimating of multiple-input and multiple-output (MIMO) to reception antenna i; w
i(t) for satisfying the additive white Gaussian noise (AWGN) of normal distribution; Coefficient (2/N
T)
1/2Be used for the normalization transmitting power; N
TEqual the summation 4 of two base station transmit antennas in the number of transmit antennas, this example; N=1 or 2.
In sum, realization of the present invention can overcome Fig. 2 to co-channel interference shown in Figure 5, effectively shortens multiplex distance, reduces frequency repeat utilization ratio, increases honeycomb system capacity.Even all sub-districts of cellular system can only use with a kind of frequency, need not the complicated network planning and power control techniques.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (11)
1, a kind of receiver that reduces frequency repeat utilization ratio is characterized in that, comprising:
One group of received antenna: be used to receive each road signal;
Disturb to suppress and offset unit: be used for each road interference between signals that a described group of received antenna receives is suppressed and offsets processing;
Signal processing unit: be used for the signal of described interference inhibition and offset unit output is carried out channel-decoding, symbol de-maps and demodulation process;
Described interference inhibition and offset unit comprise:
One group is disturbed inhibition and offsets subelement: comprise that the interference identical with the received signal way suppresses and the counteracting subelement, be arranged between the demodulator and a described group of received antenna of described signal processing unit, and be respectively applied for each road signal handled before demodulation and obtain each separate road received signal, described each disturbs and suppresses and offset to be series connection successively between the subelement, and its input signal way reduces last road signal that obtains received signal of handling successively;
Perhaps,
One is disturbed inhibition and offsets subelement: be arranged between the demodulator and a described group of received antenna of described signal processing unit, be used for each the road signal that receives is handled before demodulation, and directly export one tunnel effective signal.
2, the receiver of reduction frequency repeat utilization ratio according to claim 1, it is characterized in that, also comprise the space-time/space-frequency corresponding/empty time-frequency/spatial reuse decoding unit with transmitter terminal, be arranged between a described group of received antenna and described interference inhibition and the offset unit, be connected with offset unit with described interference inhibition with a described group of received antenna respectively, be used for the signal that a described group of received antenna receives is carried out space-time/space-frequency/empty time-frequency/spatial reuse decoding processing.
3, the receiver of reduction frequency repeat utilization ratio according to claim 1 and 2 is characterized in that, described signal processing unit also comprises:
Separate the mapping processing module: be used for handling to separating mapping through the signal after the described demodulator demodulation process;
Decoder: be used for to carrying out the channel-decoding processing through the signal of separating after mapping is handled.
4, the receiver of reduction frequency repeat utilization ratio according to claim 3 is characterized in that, described receiver also comprises:
The signal selected cell is connected with the output of described signal processing unit, be used for from receive and select one road signal as effective received signal through the signal after the respective handling.
5, the receiver of reduction frequency repeat utilization ratio according to claim 3 is characterized in that, described interference inhibition and offset unit are to set up based on maximum likelihood ML decoding, linear algorithm decoding or nonlinear algorithm decoding to be provided with.
6, a kind of wireless communication system that reduces frequency repeat utilization ratio, it is characterized in that, the receiver that comprises transmitter and reduction frequency repeat utilization ratio, transmitter will send by transmitting antenna through the signal of chnnel coding, sign map and modulation treatment, described receiver receives the signal that described transmitter sends by a group of received antenna that is provided with, and signal carried out channel-decoding, symbol de-maps, demodulation and disturb suppressing and offsetting and handle, obtain received signal;
Described receiver comprises: disturb to suppress and offset unit: be used for each the road interference between signals that receives is suppressed and offsets processing;
Described interference inhibition and offset unit comprise:
One group is disturbed inhibition and offsets subelement: comprise that the interference identical with the received signal way suppresses and the counteracting subelement, be arranged between a demodulator and the described group of received antenna, and be respectively applied for each road signal handled before demodulation and obtain each separate road received signal, described each disturbs and suppresses and offset to be series connection successively between the subelement, and its input signal way reduces last road signal that obtains received signal of handling successively;
Perhaps,
One is disturbed inhibition and offsets subelement: be arranged between a demodulator and the described group of received antenna, be used for each the road signal that receives is handled before demodulation, and directly export one tunnel effective signal.
7, the wireless communication system of reduction frequency repeat utilization ratio according to claim 6 is characterized in that, described transmitter comprises at least two, and described receiver disturbs the two paths of signals at least that receives and suppresses and the counteracting processing.
8, according to the wireless communication system of claim 6 or 7 described reduction frequency repeat utilization ratios, it is characterized in that, described each transmitter comprises based on single coding unit transmitter of bit-level and/or based on single coding unit transmitter of symbol level, and the corresponding setting with each transmitter architecture of described receiver side structure.
9, the wireless communication system of reduction frequency repeat utilization ratio according to claim 8 is characterized in that, described receiver comprises:
Based on the simple interference suppressing receiver of bit-level or many decoding units interference suppressing receiver, many decoding units interference suppressing receiver of mixing, mix and mix based on bit-level and symbol level based on symbol level based on the simple interference suppressing receiver of symbol level or many decoding units interference suppressing receiver, based on bit-level.
10, according to the wireless communication system of claim 6 or 7 described reduction frequency repeat utilization ratios, it is characterized in that, comprise base station and subscriber station, and,
Base station transmitter adopts general transmit machine or single coding unit transmitter, while or timesharing send between the different base stations, receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, subscriber station transmitter adopts general transmit machine or single coding unit transmitter, and subscriber station receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver;
Perhaps,
Base station transmitter adopts general transmit machine or single coding unit transmitter, timesharing sends between the different base stations, receiver adopts simple interference suppressing receiver or many decoding units interference suppressing receiver, subscriber station transmitter adopts general transmit machine or single coding unit transmitter, and subscriber station receiver adopts common receiver or single decoding unit receiver;
Perhaps,
Base station and subscriber station transmitter adopt general transmit machine or single coding unit transmitter, and base station and subscriber station receiver adopt common receiver or single decoding unit receiver, and timesharing sends and the timesharing reception between the different base stations.
11, the wireless communication system of reduction frequency repeat utilization ratio according to claim 10 is characterized in that, described single coding unit transmitter comprises:
Signal sends processing unit: be used for signal is carried out chnnel coding, sign map and modulation treatment;
Space-time/space-frequency/empty time-frequency/spatial reuse coding unit: be used for before the channel encoding process, perhaps the signal after chnnel coding, sign map or the modulation treatment carries out space-time/space-frequency/empty time-frequency/spatial reuse encoding process.
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| PCT/CN2006/001340 WO2007003096A1 (en) | 2005-07-05 | 2006-06-15 | Receiver and radio communication system for reducing the rate of frequency multiplex |
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| CN102523590B (en) * | 2012-01-05 | 2014-07-30 | 北京邮电大学 | Planning method of multi-system intelligent configurable wireless network |
| CN102760975B (en) * | 2012-07-13 | 2014-08-20 | 华为技术有限公司 | Base station antenna and base station |
| CN108847886A (en) * | 2018-05-25 | 2018-11-20 | 复旦大学 | A kind of method for transmitting signals of space division multiplexing mode |
| CN109683179A (en) * | 2019-01-18 | 2019-04-26 | 北京未来导航科技有限公司 | Being navigated based on low orbit satellite enhances the same frequency band receiving/transmission method and system of platform |
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| JP3629261B2 (en) * | 2002-11-26 | 2005-03-16 | 松下電器産業株式会社 | Wireless receiver |
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| 降低峰窝移动通信系统同频干扰的方法. 张治中.佛山科学技术学院学报，第18卷第2期. 2000 * |
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