CN1801686A - Multi antenna channel feedback method based on instantaneous and statistic channel information - Google Patents

Multi antenna channel feedback method based on instantaneous and statistic channel information Download PDF

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CN1801686A
CN1801686A CN 200610037610 CN200610037610A CN1801686A CN 1801686 A CN1801686 A CN 1801686A CN 200610037610 CN200610037610 CN 200610037610 CN 200610037610 A CN200610037610 A CN 200610037610A CN 1801686 A CN1801686 A CN 1801686A
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feedback
channel information
statistic
instantaneous
channel
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CN100350760C (en
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王炎
尤肖虎
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Southeast University
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Southeast University
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Abstract

The multi-antenna channel feedback method based on two modes of transient and statistic channel information feedback improves communication data ratio, reduces feedback information of multi-antenna channel, and increases robustness of multi-antenna system. Wherein, selecting feedback manner according to Doppler frequency of mobile terminal and SNR of feedback link; for transient feedback, making every sub-frame feedback one time as transient channel format; for statistic feedback, making multiple sub-frames feedback one time as statistic channel format; for statistic channel information, calculating and compressing the statistic channel, calculating the number of data stream, predicting the channel information, and correcting feedback error; for transient channel information, adaptive coding and modulating the data stream, and mapping to opposite emission orthogonal basis.

Description

Based on instantaneous and multi antenna channel feedback method statistic channel information
Technical field
The present invention is a kind of technical method that improves the feedback information of wireless communication data rate, reduction multi-antenna channel and improve the robustness of multiaerial system, belongs to the high-speed radiocommunication transmission technique field.
Background technology
Reach radio communication on the horizon at present and require data transfer rate to reach up 50Mbps and descending 100Mbps, the requirement of spectrum efficiency is also than higher.Can not satisfy following radio communication requirement if just improve transmitting power simply, therefore the multi-antenna technology based on many antenna emissions and the reception of many antennas begins to be applied.Theory and evidence, under the uncorrelated channel condition in space and the multiaerial system of the same transmitting power of a single aerial system can improve the spectrum efficiency of system exponentially.
Multi-antenna technology is divided into open loop and two kinds of schemes of closed loop transmit, and open loop emission is without any need for the information of channel, implement simple relatively, but the Capacity Ratio closed loop transmit method of system is much smaller.In order to excavate the potentiality of multiaerial system as far as possible, the main flow that the closed loop transmit method becomes high-speed radiocommunication realizes technical scheme, and corresponding various specific implementation technology are very many.In the Project Realization process, the factor that determines a kind of closed loop multi-antenna emission case amount of capacity is what of channel information of feedback, if transmitter has been known whole channel informations, then can adopt optimum power water filling launching technique, obtain very high power system capacity, its shortcoming is to need the feedack amount big.Otherwise the power system capacity that adopts the few method of feedback information volume to obtain is also few.In addition, the motion of portable terminal, the time-delay of feedback information and feedback error will reduce the capacity of multiaerial system, and therefore, how designing a kind of functional, sane multi antenna channel feedback method is the problem that needs further investigation.
Summary of the invention
Technical problem: the present invention is intended to provide a kind of low-feedback, is applicable to different terminals speed, communication environments and the multi antenna channel feedback method based on instantaneous and the statistic channel information dual-mode antenna number, sane, and this method has good feedback error resistance performance.
Technical scheme: of the present invention based on instantaneous and multi antenna channel feedback method statistic channel information, it is characterized in that this method comprises that statistic channel information feeds back and instantaneous feedback of channel information dual mode is supported multiple emission mode, just determine to adopt any feedback system according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link, if instantaneous feedback of channel information, then each subframe feedback is once fed back by instantaneous channel information form; If the statistic channel information feedback, then a plurality of subframe feedbacks are once pressed statistic channel information form feedback; When the counting statistics channel information, finish statistic channel information calculating and compression, the calculating of statistics stream number, the prediction of statistic channel information and the correction of feedback error; When calculating instantaneous channel information, data flow is carried out adaptive coding and modulating, be mapped to respectively on the corresponding opposite emission orthogonal basis.
Just determine to adopt corresponding feedback method to be according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link: when Doppler frequency is lower than signal to noise ratio higher, based on feedback link, adopt the statistic channel information feedback method; The instantaneous channel information feedback method of other situation.Feedback is that layering is carried out, and instantaneous channel information is that each subframe is fed back once; Statistic channel information is that a plurality of subframes are fed back once.
Multiple emission mode is: receiving terminal is judged the corresponding launching technique of employing according to channel condition, calculates corresponding launching code, modulation system, and feeds back the code name and the code modulation mode code name thereof of selected launching technique.Instantaneous channel feedback information form comprises feedback model sign, launching technique selection marker, list/multithread code modulation mode and data flow number.Statistical channel feedback information form comprises feedback model sign, launching technique selection marker, statistic channel information and data flow number.When finishing statistic channel information calculating with compression, the iterative computation of statistic channel information and the compression of the vector quantization of statistical information.The prediction of statistic channel information and the correction of feedback error are under the statistic channel information feedback condition, realize the prediction of statistic channel information and the correction of feedback error.
Because the circumstance complication that faces of radio communication, especially a kind of many antennas working method can't satisfy the requirement of wireless communication system under mobile environment.The many antenna emissions of closed loop simultaneously can improve systematic function, capacity and reliability greatly, and correspondingly, closed loop feedback also has multiple mode.
The present invention is based on above-mentioned consideration, proposed feedback channel, the present invention includes seven aspects based on instantaneous channel information and statistic channel information co-design multiaerial system:
(1) instantaneous layering with statistic channel information is fed back;
(2) support of multiple launching technique;
(3) instantaneous channel feedback information form determines;
(4) statistical channel feedback information form determines;
(5) statistic channel information calculates and compression;
(6) statistics stream number is calculated;
(7) correction of the prediction of statistic channel information and feedback error.
The present invention at first carries out layering feedback instantaneous and statistic channel information; As shown in Figure 1, receiver is at first finished the channel estimating of each subframe in multiaerial system, just determine to adopt any feedback method according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link, when Doppler frequency is lower than signal to noise ratio higher, based on feedback link, adopt the statistic channel information feedback method; The instantaneous channel information feedback method of other situation.
The present invention supports multiple launching technique, the correlation size that goes out according to channel estimating, the signal to noise ratio of forward link just determine to adopt corresponding launching technique, such as adopting space diversity, spatial reuse, wave beam to form or their combination, make the systematic function optimum.This launching technique is indicated by the launching technique selection marker of introducing later.
The present invention also comprises determining of instantaneous channel feedback information form, as shown in Figure 2, instantaneous channel feedback information form comprises feedback model sign, launching technique selection marker, list/multithread code modulation mode and data flow number, the once instantaneous channel information of each subframe feedback.The feedback model sign is 1 bit, indicates instantaneous feedback of channel information this moment.Being calculated as follows of list/multithread code modulation mode and data flow number: the channel matrix H (t-k) of instantaneous estimation is projected to { v on one group of orthogonal basis vector corresponding with selected launching technique 1..., v M, promptly
q m = v m H H ( t - k ) H H ( t - k ) v m M=1 ..., M (formula 1)
Here M * the N of k subframe of H (t-k) t subframe Duan Zhongdi of expression ties up channel matrix, and each subframe section comprises K subframe, and subscript H represents the conjugate transpose computing.
From { q 1..., q MIn select the big J of projection value stream, corresponding projection value is respectively { μ 1..., μ J, the code modulation mode of so corresponding J data flow is calculated by following formula:
Figure A20061003761000062
J=1 ..., J (formula 2)
Here
Figure A20061003761000063
Be illustrated in one group of coded modulation table the inside of setting, less than the current capacity of correspondence and certain code modulation mode with maximum transmission data rate.Data transfer rate number J also will feed back to transmitting terminal.
The present invention also comprises determining of statistical channel feedback information form, as shown in Figure 3, statistical channel feedback information form comprises feedback model sign, launching technique selection marker, statistic channel information and data flow number, statistic channel information of a plurality of subframe feedbacks.
The present invention includes the calculating and the compression of statistic channel information; We utilize the channel matrix of the continuous a plurality of subframes that estimate to calculate the emission correlation matrix, obtain the average emitted correlation matrix of current subframe section.The statistics emission correlation matrix weighted sum that this mean matrix and previous subframe section are calculated, the statistics that obtains current subframe section is launched correlation matrix, is expressed as with mathematic(al) representation:
R ( t ) = ( 1 - β ) R ( t - 1 ) + β 1 K Σ k = 1 K H H ( t - k ) H ( t - k ) (formula 3)
Here β represents weighted factor, the statistics emission correlation matrix when R (t) is t subframe section.Diagonal element and strictly lower triangular matrix element to R (t) carry out vector quantization, and the data after the compression are as feedback information.
The present invention also comprises the calculating of statistics stream number;
R (t) is projected to { v on one group of orthogonal basis vector corresponding with selected launching technique 1..., v MCan get
p m = v m H R ( t ) v m M=1 ..., M (formula 4)
This group orthogonal basis vector can be the base vector of fixing, and as the Fourier transform base vector, also can be the characteristic vector of statistics emission correlation matrix.
The projection value that we calculate formula (4) is by obtaining one group of new numerical value from big to small, that is:
λ 1〉=λ 2〉=... 〉=λ M(formula 5)
The orthogonal basis vector of their correspondences is { u 1..., u M, this group vector is to be resequenced by the base vector of front to form.We select L projection value of front now, and L satisfies
L ≤ min { M , N } Σ l = 1 L λ l Σ m = 1 M λ m ≥ α (formula 6)
Here α be one less than and approach 1 constant.L adds up the data streams number exactly.
The present invention also comprises the prediction of statistic channel information and the correction of feedback error; Because statistic channel information is along with the time becomes slowly, so we can predict current feedback information with twice feedack in front, promptly
R ^ ( t ) = γR ( t - 1 ) + ( 1 - γ ) R ( t - 2 ) (formula 7)
Here γ be one greater than 0.5 predictive coefficient, the corresponding data that the statistics that the real part of each data of prediction matrix the inside and imaginary part and feedback are come is launched correlation matrix compares one by one, if both differences, illustrate that feedback error exists, and replaces value of feedback with predicted value greater than a value of setting.
Description of drawings
Fig. 1 is multiaerial system and channel feedback schematic diagram.
Fig. 2 is instantaneous feedback of channel information schematic diagram.
Fig. 3 is a statistic channel information feedback schematic diagram.
Embodiment
Specific implementation process of the present invention is as follows:
1, receiver utilizes the reasonable pilot frequency sequence of orthogonality to adopt the MMSE method to estimate channel matrix, is formulated as
Y=H (t-k) S+N t(formula 8)
Here Y, S and N tBe respectively that M * P dimension received signal matrix, N * P dimension frequency pilot sign matrix and M * P tie up noise matrix, P is a pilot frequency sequence number in time.The method of estimation of channel matrix is so:
H ( t - k ) = YS H ( SS H + σ n 2 I N ) - 1 (formula 9)
2, utilize control channel and receiver estimated channel matrix to judge the signal to noise ratio height of based on feedback link and the Doppler frequency of portable terminal;
3, just determine to adopt any feedback method according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link.
(1) when Doppler frequency is lower than signal to noise ratio higher, based on feedback link, adopts the statistic channel information feedback method,, utilize vector quantization method compression statistics covariance matrix with iteration update method counting statistics emission correlation matrix and data streams number.
When (2) and signal to noise ratio based on feedback link not high when Doppler frequency is not low, adopt instantaneous channel information feedback method, calculate list/multithread code modulation mode, determine the data streams number of their correspondences.
4, the layering of statistics and instantaneous channel information feedback, this feedback channel design is supported multiple emission mode and is switched according to the launching technique selection marker.
When carrying out the statistic channel information feedback, a plurality of subframe feedbacks: statistics emission correlation matrix and data flow number after feedback model Warning Mark, launching technique selection marker, the compression, concrete form is seen shown in Figure 2.The launching technique selection marker is encoded, and as the numbering correspondence 001 of 000, the second kind of launching technique of numbering correspondence of first kind of launching technique, so carries out, and several launching techniques are arranged, and just compiles several numberings in order.
When carrying out instantaneous feedback of channel information, each subframe feedback: feedback model Warning Mark, launching technique selection marker, list/multithread code modulation mode and data flow number, concrete form is seen shown in Figure 3.Identical, the same when launching technique of corresponding instantaneous feedback of channel information not necessarily feed back with statistic channel information, launching technique also is numbered at this moment, and method is described with the front.
5, transmitting terminal receives from receiver and passes the feedback information of coming, and is the statistic channel information feedback if the feedback model Warning Mark shows, predicts that by preceding twice feedback information current feedback has inerrancy, and revises.Transmitting terminal is determined list/multithread launching code modulation system and launching technique according to feedback information, list/multiple data stream is carried out linear predictive coding be mapped on each antenna, launches.Receiver receives the emission data, finishes work such as decoding, demodulation.System realizes as shown in Figure 1.

Claims (8)

1, a kind of multi antenna channel feedback method based on instantaneous and statistic channel information, it is characterized in that this method comprises that statistic channel information feeds back and instantaneous feedback of channel information dual mode is supported multiple emission mode, just determine to adopt any feedback system according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link, if instantaneous feedback of channel information, then each subframe feedback is once fed back by instantaneous channel information form; If the statistic channel information feedback, then a plurality of subframe feedbacks are once pressed statistic channel information form feedback; When the counting statistics channel information, finish statistic channel information calculating and compression, the calculating of statistics stream number, the prediction of statistic channel information and the correction of feedback error; When calculating instantaneous channel information, data flow is carried out adaptive coding and modulating, be mapped to respectively on the corresponding opposite emission orthogonal basis.
2, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1, it is characterized in that just determining to adopt corresponding feedback method to be: when Doppler frequency is lower than signal to noise ratio higher, based on feedback link, adopt the statistic channel information feedback method according to the Doppler frequency of portable terminal and the signal to noise ratio of based on feedback link; The instantaneous channel information feedback method of other situation.
3, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1 is characterized in that feedback is that layering is carried out, and instantaneous channel information is that each subframe is fed back once; Statistic channel information is that a plurality of subframes are fed back once.
4, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1, it is characterized in that multiple emission mode is: receiving terminal is judged the corresponding launching technique of employing according to channel condition, calculate corresponding launching code, modulation system, and feed back the code name and the code modulation mode code name thereof of selected launching technique.
5, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1 is characterized in that instantaneous channel feedback information form comprises feedback model sign, launching technique selection marker, list/multithread code modulation mode and data flow number.
6, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1 is characterized in that statistical channel feedback information form comprises feedback model sign, launching technique selection marker, statistic channel information and data flow number.
7, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1, when it is characterized in that finishing statistic channel information calculating with compression, the iterative computation of statistic channel information and the compression of the vector quantization of statistical information.
8, the multi antenna channel feedback method based on instantaneous and statistic channel information according to claim 1, it is characterized in that the prediction of statistic channel information and the correction of feedback error are under the statistic channel information feedback condition, realize the prediction of statistic channel information and the correction of feedback error.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009033358A1 (en) * 2007-09-12 2009-03-19 Sharp Kabushiki Kaisha Information feedback method, system, user device, and base station based on space, time and frequency domain
CN102694630A (en) * 2011-03-25 2012-09-26 华为技术有限公司 Method, device and system for link adaptation
WO2018027813A1 (en) * 2016-08-11 2018-02-15 华为技术有限公司 Method and apparatus for reporting feedback parameters

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* Cited by examiner, † Cited by third party
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US6006110A (en) * 1995-02-22 1999-12-21 Cisco Technology, Inc. Wireless communication network using time-varying vector channel equalization for adaptive spatial equalization
CN1150710C (en) * 2001-04-29 2004-05-19 信息产业部电信传输研究所 Dynamic average length regulating method and device for channel estimation
CN1156179C (en) * 2001-09-03 2004-06-30 信息产业部电信传输研究所 Dynamic regulation method and device of channel estimation everage region
KR20050081528A (en) * 2004-02-14 2005-08-19 삼성전자주식회사 Channel state information feedback method for multi-carrier communication system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009033358A1 (en) * 2007-09-12 2009-03-19 Sharp Kabushiki Kaisha Information feedback method, system, user device, and base station based on space, time and frequency domain
CN102694630A (en) * 2011-03-25 2012-09-26 华为技术有限公司 Method, device and system for link adaptation
WO2012129909A1 (en) * 2011-03-25 2012-10-04 华为技术有限公司 Method, device, and system for link adaptation
CN102694630B (en) * 2011-03-25 2015-08-05 华为技术有限公司 For the methods, devices and systems of link circuit self-adapting
WO2018027813A1 (en) * 2016-08-11 2018-02-15 华为技术有限公司 Method and apparatus for reporting feedback parameters
CN109478955A (en) * 2016-08-11 2019-03-15 华为技术有限公司 A kind of feedback parameter report method and device

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