CN101861706A - A multi-antenna receiving diversity combining method and device with decoding feedback - Google Patents

A multi-antenna receiving diversity combining method and device with decoding feedback Download PDF

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Publication number
CN101861706A
CN101861706A CN200780101563A CN200780101563A CN101861706A CN 101861706 A CN101861706 A CN 101861706A CN 200780101563 A CN200780101563 A CN 200780101563A CN 200780101563 A CN200780101563 A CN 200780101563A CN 101861706 A CN101861706 A CN 101861706A
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signal
maximum
noise ratio
branch road
decoding
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张晶
乔嘉
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UTStarcom Telecom Co Ltd
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UTStarcom Telecom Co Ltd
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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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

A multi-antenna receiving diversity combining method with decoding feedback includes: (1) the multi-antenna receiver sorts each branch by value of signal noise ratio; (2) choosing the branch with the maximum signal noise ratio and demodulating and decoding, if the decode is right, the decode result is output; (3) if the decode is false, the branch with the second maximum signal noise ratio is added to the maximal ratio combining concourse, namely, carrying out maximal ratio combining for the branch with the maximum signal noise ratio and the branch with the subaltern maximum signal noise ratio, and demodulating and decoding, if the decode isright, the decode result is output; (4) if the decode is false, according to the said method, the branch with the third maximum signal noise ratio is added to the maximal ratio combining concourse, until the decode is right, or all branch have participated in the maximal ratio combining.

Description

A multi-antenna receiving diversity combining method and device with decoding feedback
Multiple antennas with decoding feedback
Receive the method and apparatus technical field that diversity merges
The method and apparatus that diversity merges are received the present invention relates to a kind of multiple antennas with decoding feedback, specifically, is related to a kind of multiple antennas with decoding feedback for wireless communication system and receives the method and apparatus that diversity merges.Background technology
In a wireless communication system, there is deep fade.Seldom occur simultaneously during same time interval of the deep fade on two or more pieces path, so diversity can reduce the influence of decline.Conventional antenna diversity has space diversity and polarity diversity.If receiver have it is multiple be sufficiently spaced-apart remote antenna, and the decline of signal that they are received is separate, then they just can use space diversity reception.When more than 10 wavelength of antenna spacing, preferable space diversity effect can be obtained.Receiver can also use +/- 45.Or the dual polarized antenna of vertical/horizontal, realize polarity diversity.Receiver obtains diversity gain by merging two mutually orthogonal electric field component signals.
Conventional has maximum-ratio combing and selectivity to merge for the merging treatment that multiple antennas receives diversity signal.In maximum-ratio combing, optimum performance and same phase are reached to multiple signals weighting before merging.It is the principle based on the optimum signal in selecting all signals of the reception from different branch in receiver that selectivity, which merges,.
In a wireless communication system, wireless signal is reflected by various objects in wireless channel, result in multipath transmisstion.Multipath transmisstion causes intersymbol interference.The universal means for eliminating intersymbol interference are time-domain channel equalizations.The complexity of time-domain channel equalization device is as the ratio of maximum multipath time delay and transmission symbol period increases and increases.It is no longer real using time-domain channel equalization device when transmitting information with high character rate.OFDM (OFDMs）The data flow of high-speed is resolved into the data flow of multiple low rates, with parallel Mode transmit over the plurality of subcarriers, due to the data flow on each subcarrier symbol period be much larger than original symbol period, so that the influence for the intersymbol interference that multipath is brought is alleviated, without using time-domain channel equalization.OFDM advantage causes it to be gradually applied to instead of single-carrier technology in the various wireless communication system such as WLAN, digital terrestrial television, broadband wireless access.
For ofdm system, in the reception symbol Yk of k-th of subcarrier of receiving side
Yk = HkXk + Nk
Wherein, Xk is transmitting symbol, and Hk is the channel response on subcarrier k, and Nk is additive noise.When Xk is known pilot frequency sequence, channel response can be evaluated whether out.In criterion of least squares（LS under), the estimated value of channel response is：
Wherein, the frequency pilot sign sent on k-th of subcarrier is referred to.Generally,Hk ≠ HHigher in signal to noise ratio, the error of channel estimation is smaller；Signal to noise ratio is lower, and the error of channel estimation is bigger.By to entering row interpolation, it is estimated that including the channel response on all subcarriers including data symbol.For maximum-ratio combing, maximum-ratio combing is output as
If the weights of other branch roads in addition to the best branch road of signal quality are forced into zero setting, selective merging is deteriorated to：
yd _ ^k,ik
k,mrc― ΛWherein, ik represents the best branch road of signal quality.
The output signal of combiner is sent to decoder and is for further processing.
As it was previously stated, signal to noise ratio is lower, the error of channel estimation is bigger.Closed in high specific And in algorithm, it is as weights, therefore, in the case where a certain branch road or some branch roads are in low signal-to-noise ratio with the conjugation of channel response, the performance of maximum-ratio combing is substantially reduced due to the error of channel estimation, or even can bring very big negative gain.The content of the invention
The invention aims to provide a kind of multiple antennas with decoding feedback to receive the method and apparatus that diversity merges, it is compared with prior art, in the case where a certain branch road or some branch roads are in low signal-to-noise ratio, it is to avoid the penalty brought due to channel response evaluated error and signal-to-noise ratio (SNR) estimation error to maximum-ratio combing.
To reach above-mentioned purpose, multi-aerial receiver involved in the present invention is first arranged each branch road by the estimated value descending of signal to noise ratio.The maximum branch road of selection signal to noise ratio is demodulated, and is decoded.If decoding is correct, decoded result is exported.If decoding is incorrect, second largest branch road of signal to noise ratio is added to the branch road that maximum-ratio combing set, i.e. signal to noise ratio are maximum and signal to noise ratio time is big and carries out maximum-ratio combing, then demodulates, decodes.If decoding is correct, decoded result is exported.If decoding is incorrect, analogize according to the method described above, the third-largest branch road of signal to noise ratio is added into maximum-ratio combing set, until decoding correctly, or all branch roads are all already engaged in maximum-ratio combing.
Merge device present invention also offers a kind of reception diversity of multiaerial system with decoding feedback, including：
Channel estimation/SNR estimator, the signal to noise ratio for the signal of each branch road reception to multi-aerial receiver is estimated；
Combiner, is coupled with the channel estimation/SNR estimator；And decoder, it is coupled with the combiner, for being decoded to the signal that the combiner is exported；
The combiner performs following action in combination with the decoder：
(1) combiner is arranged each branch road by the estimated value of signal to noise ratio；
(2) the maximum branch road of selection signal to noise ratio is demodulated and decoded, if decoding is just Really, then decoded result is exported；
(3) decode incorrect as bright, then second largest branch road of signal to noise ratio is added to maximum-ratio combing set, i.e. signal to noise ratio maximum and the big branch road of signal to noise ratio time carries out maximum-ratio combing, then demodulation and decoding；If decoding is correct, decoded result is exported；
(4) if decoding is incorrect, analogize according to the method described above, the third-largest branch road of signal to noise ratio is added into maximum-ratio combing set, until decoding correctly, or all branch roads are all already engaged in maximum-ratio combing.
Receiver tool of the present invention has an enormous advantage.Good in some tributary signal quality, in the case of some tributary signal poor qualities, the signal to noise ratio of the bad branch road of signal quality and the estimation error of channel response are big, can be deteriorated using maximum-ratio combing performance.Controlled to participate in the circuitry number of maximum-ratio combing according to decoding feedback using receiver of the present invention, be optimal systematic function.
The present invention will be illustrated by preferred embodiment combination accompanying drawing.Brief description of the drawings
Fig. 1 represents the structure chart of the maximum-ratio combing receiver of prior art.
Fig. 2 represents that the selectivity of prior art merges the structure chart of receiver.
Fig. 3 represents the structure chart of receiver of the present invention.
Fig. 4 represents that diversity of the present invention merges the flow chart of algorithm.Embodiment
Referring to the drawings, specific embodiments of the present invention be will be described in detail.
In Fig. 1, the wireless signal that emitter transmitting is modulated by OFDM, is received by No. four antennas of receiver.Four road signals are respectively through being down-converted to baseband signal, then by FFT (Fast Fourier Transform (FFT)s）, transform to the corresponding reception symbol of each subcarrier, the reception symbol Yk of k-th of subcarrier
Yk = HkXk + Nk Wherein, Xk is transmitting symbol, and Hk is that the channel on subcarrier k is corresponding, and Nk is additive noise.Then root Ju receive signal in reception frequency pilot sign Yk and emitter transmitting frequency pilot sign ^ estimate channel response
Χζ kΧ ζ are again by rightHK enters row interpolation, it is estimated that including the channel response on all subcarriers including data symbol.Maximum-ratio combing is carried out to four road signals, maximum-ratio combing is output as
ΣΜ γ τ τ *
_ m=i k,i n k,m
K, mrc 2 in fig. 2, just according to the estimate or the estimate of signal to noise ratio of channel response, selects the branch road that modulus value is maximum or signal to noise ratio is maximum of channel response to be demodulated as signal is received, algorithm is as follows in a balanced way：
Fig. 3 gives the structure chart of receiver of the present invention.
Include from figure 3, it can be seen that the reception diversity of the multiaerial system with decoding feedback of the present invention merges device：Low-converter, Fast Fourier Transform Block, channel estimation/SNR estimator, combiner and decoder.The function and correlation of all parts of the reception diversity merging device of the present invention are described below in detail.
According to the present invention, the baseband signal is transformed to the corresponding reception symbol of each subcarrier, the reception symbol Y of k-th of subcarrier by multiple signals by the low-converter respectively through baseband signal, the Fast Fourier Transform Block is down-converted tok
Yk = HkXk + Nk
Wherein, XkIt is transmitting symbol, HkIt is that channel on subcarrier k is corresponding, NkIt is power mouthful property noise. Channel estimation/the SNR estimator, the signal to noise ratio for the signal of each branch road reception to multi-aerial receiver is estimated.Specifically, the channel estimation/SNR estimator is according to the frequency pilot sign for receiving the reception in signalYkThe frequency pilot sign ^ launched with emitter, estimates channel response
Again by entering row interpolation, estimating including the channel response on all subcarriers including data symbol.
The combiner is coupled with the channel estimation/SNR estimator；The decoder is coupled with the combiner, for being decoded to the signal that the combiner is exported.
The combiner closes ground with the Xie Ma Qi Group and performs following act：
(1) institute's fan's combiner is arranged each branch road by the estimated value of signal to noise ratio；
(2) the maximum branch road of selection signal to noise ratio is demodulated and decoded, if decoding is correct, exports decoded result.Specifically, the combiner selects the branch road that modulus value is maximum or signal to noise ratio is maximum of channel response to be demodulated as signal is received, algorithm is as follows in a balanced way according to the estimate of channel response or the estimate of signal to noise ratio：
yd _ m
K, mrc wherein, ikRepresent the best branch road of signal quality；
(3) if decoding is incorrect, second largest branch road of signal to noise ratio is added to the branch road that maximum-ratio combing set, i.e. signal to noise ratio are maximum and signal to noise ratio time is big and carries out maximum-ratio combing, then demodulates and decodes；If decoding is correct, decoded result is exported；
(4) decode incorrect as bright, then analogize according to the method described above, the third-largest branch road of signal to noise ratio is added into maximum-ratio combing set, until decoding correctly, or all branch roads are all already engaged in maximum-ratio combing.
Specifically, the combiner carries out maximum-ratio combing for multiple signals, maximum It is output as than merging
ΣΜ γ U*
Σ
Fig. 4 represents that diversity of the present invention merges the flow chart of algorithm.Referring to Fig. 4, S1 is arranged each branch road by the estimated value descending of signal to noise ratio, and each branch road is initialized to be not involved in maximum-ratio combing by S2.S3 is not involved in the set that the maximum branch road of signal to noise ratio in the branch road of maximum-ratio combing is added to participation maximum-ratio combing by remaining.S4 maximum-ratio combings.S5 is decoded.S6 judges whether decoding succeeds, and terminates if successfully decoded, decodes unsuccessful as bright, performs S7.S7 judges whether also to have neither part nor lot in the branch road of maximum-ratio combing.If there is the branch road for having neither part nor lot in maximum-ratio combing, S3 is performed.If not having neither part nor lot in the branch road of maximum-ratio combing, terminate.

Claims (9)

  1. 1st, a kind of reception diversity combining method of the multiaerial system with decoding feedback, including step：
    (1) multi-aerial receiver is arranged each branch road by the estimated value of signal to noise ratio；
    (2) the maximum branch road of selection signal to noise ratio is demodulated and decoded, if decoding is correct, exports decoded result；
    (3) if decoding is incorrect, second largest branch road of signal to noise ratio is added to the branch road that maximum-ratio combing set, i.e. signal to noise ratio are maximum and signal to noise ratio time is big and carries out maximum-ratio combing, then demodulates and decodes；If decoding is correct, decoded result is exported；
    (4) if decoding is incorrect, analogize according to the method described above, the third-largest branch road of signal to noise ratio is added into maximum-ratio combing set, until decoding correctly, or all branch roads are all already engaged in maximum-ratio combing.
    2nd, the method according to claim 1, wherein the adaptive multi-antenna system is orthogonal frequency division multiplex OFDM system.
    3rd, according to the method described in claim 1, wherein step（1) each branch road is arranged by the estimated value of signal to noise ratio according to descending in.
    4th, method according to claim 2, wherein in step（2) step is also included in：
    1. the emitter of the ofdm system launches the wireless signal after OFDM is modulated, its receiver carries out multi-path antenna reception, multiple signals are respectively through being down-converted to baseband signal, again the corresponding reception symbol of each subcarrier, the reception symbol Y of k-th of subcarrier are transformed to by Fast Fourier Transform (FFT)k
    Yk=HkXk+Nk Wherein, XkIt is transmitting symbol, HkIt is that channel on subcarrier k is corresponding, NkIt is power P noises；
    2. according to the frequency pilot sign Y for receiving the reception in signalkThe frequency pilot sign ^ launched with emitter, estimates channel response
    Again by entering row interpolation, estimating including the channel response on all subcarriers including data symbol；
    3. according to the estimate of channel response or the estimate of signal to noise ratio, the branch road that modulus value is maximum or signal to noise ratio is maximum of channel response is selected to be demodulated as signal is received, algorithm is as follows in a balanced way：
    J
    yd k,ik ·
    K, rc, wherein, ikRepresent the best branch road of signal quality.
    5th, method according to claim 2, wherein Bu Sudden（3 ) 、 （4) the maximum-ratio combing process in includes step：
    1. the emitter of the ofdm system launches the wireless signal after OFDM is modulated, its receiver carries out multi-path antenna reception, multiple signals are respectively through being down-converted to baseband signal, again the corresponding reception symbol of each subcarrier, the reception symbol Y of k subcarrier of the mat woven of fine bamboo strips are transformed to by Fast Fourier Transform (FFT)k
    Yk = HkXk + Nk
    Wherein, XkIt is transmitting symbol, HkIt is that channel on subcarrier k is corresponding, NkIt is additivitypQiao sound；.
    2. according to the frequency pilot sign Y for receiving the reception in signalkThe frequency pilot sign launched with emitter estimates channel response ^ k k Again by entering row interpolation, estimating including the channel response on all subcarriers including data symbol；
    3. maximum-ratio combing is carried out for multiple signals, maximum-ratio combing is output as
    ΣΜ γ
    _, ,=l,
    ― Λ 2 °
    yM Hk、i
    6th, a kind of reception diversity of multiaerial system with decoding feedback merges device, including：
    Channel estimation/SNR estimator, the signal to noise ratio for the signal of each branch road reception to multi-aerial receiver is estimated；
    Combiner, is coupled with the channel estimation/SNR estimator；And decoder, it is coupled with the combiner, for being decoded to the signal that the combiner is exported；
    The combiner performs following action in combination with the decoder：
    (1) combiner is arranged each branch road by the estimated value of signal to noise ratio；
    (2) the maximum branch road of selection signal to noise ratio is demodulated and decoded, if decoding is correct, exports decoded result；
    (3) if decoding is incorrect, second largest branch road of signal to noise ratio is added to the branch road that maximum-ratio combing set, i.e. signal to noise ratio are maximum and signal to noise ratio time is big and carries out maximum-ratio combing, then demodulates and decodes；If decoding is correct, decoded result is exported；
    (4) if decoding is incorrect, analogize according to the method described above, the third-largest branch road of signal to noise ratio is added into maximum-ratio combing set, until decoding correctly, or all branch roads are all already engaged in maximum-ratio combing.
    7th, device according to claim 6, wherein the adaptive multi-antenna system is orthogonal frequency division multiplex OFDM system. 8th, device according to claim 6, wherein each branch road is arranged by the estimated value of signal to noise ratio according to descending.
    9th, device according to claim 7, also include low-converter and Fast Fourier Transform Block, the low-converter is by multiple signals respectively through being down-converted to baseband signal, the baseband signal is transformed to the corresponding reception symbol of each subcarrier, the reception symbol Y of k subcarrier of the mat woven of fine bamboo strips by the Fast Fourier Transform Blockk
    Yk = HkXk + Nk
    Wherein, XkIt is transmitting symbol, HkIt is that channel on subcarrier k is corresponding, NkIt is power P noises；
    Channel estimation/the SNR estimator is according to the frequency pilot sign Y for receiving the reception in signalkThe frequency pilot sign ^ launched with emitter, estimates channel response
    Again by entering row interpolation, estimating including the channel response on all subcarriers including data symbol；
    The combiner selects the branch road that modulus value is maximum or signal to noise ratio is maximum of channel response to be demodulated as signal is received, algorithm is as follows in a balanced way according to the estimate of channel response or the estimate of signal to noise ratio：
    Wherein, ikRepresent the best branch road of signal quality.
    10th, device according to claim 7, also include low-converter and Fast Fourier Transform Block, the baseband signal is transformed to every height by multiple signals by the low-converter respectively through baseband signal, the Fast Fourier Transform Block is down-converted to The corresponding reception symbol of carrier wave, the reception symbol Y of k-th of subcarrierk
    Yk = HkXk + Nk
    Wherein, XkIt is transmitting symbol, HkIt is that channel on subcarrier k is corresponding, NkIt is additive noise；
    Channel estimation/the SNR estimator is according to the frequency pilot sign Y for receiving the reception in signalkThe frequency pilot sign A launched with emitter, estimates channel response
    Again by entering row interpolation, estimating including the channel response on all subcarriers including data symbol；
    The combiner carries out maximum-ratio combing for multiple signals, and maximum-ratio combing is output as
CN200780101563A 2007-12-10 2007-12-10 A multi-antenna receiving diversity combining method and device with decoding feedback Pending CN101861706A (en)

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Cited By (3)

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WO2012103715A1 (en) * 2011-06-28 2012-08-09 华为技术有限公司 Method and base station for obtaining combining gain
CN110365391A (en) * 2019-07-25 2019-10-22 重庆邮电大学 A kind of method of 5G downlink channel signals diversity reception
CN112153513A (en) * 2020-09-24 2020-12-29 恒玄科技(上海)股份有限公司 Wireless earphone for wireless communication, wireless communication method and medium

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CN101848016A (en) * 2010-05-13 2010-09-29 深圳大学 Diversity combining method and device

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JP2003258763A (en) * 2002-03-06 2003-09-12 Fujitsu Ltd Multicarrier cdma receiving apparatus and receiving method therefor
CN100518011C (en) * 2005-09-20 2009-07-22 中兴通讯股份有限公司 Adaptive diversity merging method of base band receiver for double antenna system
CN101064546A (en) * 2006-04-28 2007-10-31 华为技术有限公司 Pilot multiplexing method and wireless communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012103715A1 (en) * 2011-06-28 2012-08-09 华为技术有限公司 Method and base station for obtaining combining gain
CN110365391A (en) * 2019-07-25 2019-10-22 重庆邮电大学 A kind of method of 5G downlink channel signals diversity reception
CN112153513A (en) * 2020-09-24 2020-12-29 恒玄科技(上海)股份有限公司 Wireless earphone for wireless communication, wireless communication method and medium

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