CN102036396A - Downlink multi-antenna cooperation multipoint transmission-oriented feedback codebook bit allocation method - Google Patents

Downlink multi-antenna cooperation multipoint transmission-oriented feedback codebook bit allocation method Download PDF

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CN102036396A
CN102036396A CN2010105917150A CN201010591715A CN102036396A CN 102036396 A CN102036396 A CN 102036396A CN 2010105917150 A CN2010105917150 A CN 2010105917150A CN 201010591715 A CN201010591715 A CN 201010591715A CN 102036396 A CN102036396 A CN 102036396A
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base station
user
users
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channel
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CN102036396B (en
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侯雪颖
杨晨阳
袁方
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Beihang University
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Abstract

The invention relates to a downlink multi-antenna cooperation multipoint transmission-oriented feedback codebook bit allocation method and belongs to the technical field of wireless communication. The method comprises the following steps that: users measure average signal energy of a plurality of base stations to the users and feed the average signal energy back to a serving base station by an uplink channel; the serving base station transmits the information to a central processing unit; the central processing unit calculates a codebook bit number for each user by utilizing the positions of the users and related information according to scheduling results of a plurality of users and the communication quality requirements and transmits calculation results to the corresponding users; the users search codebooks according to the bit numbers and quantize the channel by using the codebooks; the users transmit codeword indexes which are obtained by quantization to the base stations; and the base stations transmit the codeword indexes to the central processing unit and generate precoded codes according to received code words. By the method, the position information of the users can be effectively utilized to calculate the required minimum feedback bit numbers which meet the communication quantity requirements of the users so as to meet the performance of the users and reduce the feedback overhead required by a system.

Description

Feedback code book Bit distribution method towards descending multi-antenna cooperative multicast communication
Technical field
The present invention relates to a kind of feedback code book Bit distribution method towards descending multi-antenna cooperative multicast communication, relate in particular to the method for Bit Allocation in Discrete when local channel and cross-channel are fed back of user in a kind of multi-BS (base station) multi-user Limited Feedback system, belong to wireless communication technology field.
Background technology
(Coordinated Multi-Point CoMP) can effectively improve spectrum efficiency to cooperative multipoint transmission, suppresses minizone, inter-sector interference, is one of important technology of Long Term Evolution plan (LTE-A).In the CoMP cooperative processing system, can the base station obtain the essential condition that channel information (CSI) becomes performance CoMP system advantage effectively.Frequency Division Duplexing (FDD) (FDD) down collaboration transmission system need be by limited bandwidth the up channel feedback channel information, so overhead can become serious problems, even can offset the system performance gain that CoMP brings.Therefore, in that to satisfy the feedback quantity that reduces Limited Feedback under the prerequisite of QoS of customer as far as possible most important.
Compare with its traditional non-cooperative transmission system, the CoMP system has some characteristics of self, is dynamic or semi-static variation etc. such as channel asymmetry, cooperative base station number.This causes at global channel combined optimization design codebooks and selects code word unrealistic.Based on the feedback technique of single channel (per-cell) code book because its flexibility and good backwards compatibility are more feasible in real system.
Per-cell code book feedback technique is meant that independently per-cell code book is used in each sub-district in the CoMP system, and the user quantizes the scheme fed back respectively to the channel of each sub-district.
Consider the CoMP system of N base station collaboration, there is M root antenna each base station, user side configuration single antenna, a plurality of users of CoMP system service.K user's descending global channel (global channel) can be made of the channel of each cooperative base station to this user:
g k = α k , 1 h k , 1 , α k , 2 h k , 2 , . . . α k , N c h k , N
H wherein K, iBe i base station to k serviced user's per-cell small scale channel vector, its each element is for statistics independent same distribution and average are zero, variance is 1 multiple Gaussian random variable, a K, iBe the corresponding path loss factor, i=1 ..., N.
Suppose the channel h of user k to base station i K, iThe code word that quantizes to obtain feeding back is The base station that participates in cooperation will obtain codeword information and feed back to center processor (CU) respectively, the global channel after CU finally obtains to quantize:
g ^ k = α k , 1 h ^ k , 1 , α k , 2 h ^ k , 2 , . . . α k , N h ^ k , N
Can adopt the ZF precoding technique to eliminate inter-user interference and carry out the space division multiplexing transmission.All users' that obtain according to CU compound channel
Figure BSA00000388341500022
With the ZF matrix
Figure BSA00000388341500023
K row carry out obtaining v after the normalization k=V (:, k)/|| V (:, k) || as k user's precoding vector.
The average quantization precision of considering the channel direction of per-cell channel is
Figure BSA00000388341500024
(channel direction wherein
Figure BSA00000388341500025
), and establish k user B is used in b base station K, bThe code book feedback of bit, then the upper bound of average quantization precision is
Figure BSA00000388341500026
The just simple consideration of present existing Bit Allocation in Discrete scheme waits the distribution of bit to subscriber's local channel and cross-channel, do not make full use of the asymmetric property of channel, if bit number is smaller, can not cause the CoMP systematic function not even as the performance of non-CoMP system.
Summary of the invention
The objective of the invention is to propose a kind of feedback code book Bit distribution method towards descending multi-antenna cooperative multicast communication, make full use of the asymmetric property of channel, the user carries out the method for optimum Bit Allocation in Discrete according to self large scale information and pairing user's large scale information to local channel and cross-channel when having designed multi-user's cooperation transmission, reduces the needed feedback overhead of system when satisfying the user performance demand.
The feedback code book Bit distribution method towards descending multi-antenna multi-base station cooperation transmission that the present invention proposes comprises with next step:
(1) establish cooperative transmission system and be made up of N base station, each base station configuration M antenna connects by center processing unit between each base station; Dispatch the multi-user in the cooperative transmission system base station, selects K user wherein to serve simultaneously;
(2) the long-time statistical average signal energy of channel in K user's measuring N base station being scheduled out of a plurality of base stations notice and between the user J=1 ... K, b=1 ..., N; J user by uplink feedback channel with above-mentioned long-time statistical average signal energy
Figure BSA00000388341500028
Feed back to b base station in N the base station, b base station is with the long-time statistical average signal energy that receives
Figure BSA00000388341500029
Be transferred to center processing unit;
(3) center processing unit requires γ according to the communication quality of k user's setting of above-mentioned selection k, pass through following formula:
Figure BSA000003883415000210
Calculate the bit number B that distributes between k user and b the base station K, b, wherein
Figure BSA000003883415000211
Figure BSA00000388341500031
Figure BSA00000388341500032
λ satisfies
Figure BSA00000388341500033
(0, x) computing repeats this step to expression max, obtains distributing to the bit number between all selection users and each base station;
(4) center processing unit will be distributed to all and select users and bit number between each base station to be transferred to corresponding base station in the cooperative transmission system, and by corresponding base station the bit number of distribution will be transferred to corresponding user;
(5) channel vector of establishing between k user and b the base station is h K, b, k the bit number B that the user notifies according to b base station K, bFrom this user's code library, search and bit number B K, bCorresponding code book C K, b, C K, bIn comprise
Figure BSA00000388341500034
Individual code word, k user according to
Figure BSA00000388341500035
Obtain code word c K, b, and, repeat this step to b this code word of base station feedback, all base stations obtain the code word of relative users;
(6) each base station in the cooperative transmission system is respectively with the feedback code c that receives K, bBe transferred to center processing unit;
(7) center processing unit finds corresponding code word according to the feedback code index of all base stations that receive, and reconstruct obtains each user's global channel, utilizes all users' global channel, generates the precoding of cooperative transmission system.
The feedback code book Bit distribution method that the present invention proposes towards descending multi-antenna cooperative multicast communication, its advantage is:
The user measures the long-time statistical average signal energy of a plurality of base stations to self among the present invention, and by up channel this signal energy is fed back to serving BS, and serving BS is given center processing unit with this message transmission.Center processing unit is according to scheduling result, and the user's communications quality requirement of dispatching out, quantizes the needed bit number of each BTS channel for each user calculates this user; Then the bit number that calculates is transferred to relative users, the user searches corresponding code book according to the bit number of base station notice, and utilizes corresponding code book that corresponding per-cell channel is quantized; End user is transferred to the base station with the codewords indexes of representing each BTS channel respectively that quantizes to obtain, base station transmits is given center processing unit, center processing unit finds corresponding code word according to the codewords indexes of receiving, reconstruct obtains each user's global channel, utilizes all users' global channel to generate the multi-base station cooperative transfer pre-coding.The inventive method can make full use of user's large scale information, with and the pairing user large scale information, calculate the optimum feedback code book Bit Allocation in Discrete of user to local channel and cross-channel, thereby obtain minimum feedback bits total amount under the prerequisite that guarantees the user's communications quality requirement, when satisfying the user performance demand, reduce the needed feedback overhead of system.
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method.
Fig. 2 is the system block diagram of cooperative transmission system.
Embodiment
The feedback code book Bit distribution method that the present invention proposes towards descending multi-antenna multi-base station cooperation transmission, its FB(flow block) comprises as shown in Figure 1 with next step:
(1) establish cooperative transmission system and be made up of N base station, each base station configuration M antenna connects by center processing unit between each base station; Dispatch the multi-user in the cooperative transmission system base station, selects K user wherein to serve simultaneously, and the system block diagram of cooperative transmission system as shown in Figure 2.
(2) the long-time statistical average signal energy of channel in K user's measuring N base station being scheduled out of a plurality of base stations notice and between the user
Figure BSA00000388341500041
J=1 ... K, b=1 ..., N; J user by uplink feedback channel with above-mentioned long-time statistical average signal energy
Figure BSA00000388341500042
Feed back to b base station in N the base station, b base station is with the long-time statistical average signal energy that receives Be transferred to center processing unit.
(3) center processing unit requires γ according to the communication quality of k user's setting of above-mentioned selection k, pass through following formula:
Figure BSA00000388341500044
Calculate the bit number B that distributes between k user and b the base station K, b, wherein
Figure BSA00000388341500046
Figure BSA00000388341500047
λ satisfies
Figure BSA00000388341500048
(0, x) computing repeats this step to expression max, obtains distributing to the bit number between all selection users and each base station.
(4) center processing unit will be distributed to all and select users and bit number between each base station to be transferred to corresponding base station in the cooperative transmission system, and by corresponding base station the bit number of distribution will be transferred to corresponding user;
(5) channel vector of establishing between k user and b the base station is h K, b, k the bit number B that the user notifies according to b base station K, bFrom this user's code library, search and bit number B K, bCorresponding code book C K, b, C K, bIn comprise
Figure BSA00000388341500049
Individual code word, k user according to Obtain code word c K, b, and, repeat this step to b this code word of base station feedback, all base stations obtain the code word of relative users.
(6) each base station in the cooperative transmission system is respectively with the feedback code c that receives K, bBe transferred to center processing unit.
(7) center processing unit finds corresponding code word according to the feedback code index of all base stations that receive, and reconstruct obtains each user's global channel, utilizes all users' global channel, generates the precoding of cooperative transmission system.
Describe content of the present invention in detail below in conjunction with accompanying drawing:
(1) establish cooperative transmission system and be made up of N base station, each base station configuration M antenna connects by center processing unit between each base station; The base station utilizes traditional user scheduling method, such as proportional fair dispatching method, the multi-user in the cooperative transmission system is dispatched, and selects K user wherein to serve simultaneously.
(2) the long-time statistical average signal energy of channel in K user's measuring N base station being scheduled out of a plurality of base stations notice and between the user
Figure BSA00000388341500051
J=1 ... K, b=1 ..., N; J user by uplink feedback channel with above-mentioned long-time statistical average signal energy
Figure BSA00000388341500052
Feed back to b base station in N the base station, b base station is with the long-time statistical average signal energy that receives
Figure BSA00000388341500053
Be transferred to center processing unit;
(3) center processing unit requires γ according to the communication quality of k user's setting of above-mentioned selection k, pass through following formula:
Figure BSA00000388341500054
Calculate the bit number B that distributes between k user and b the base station K, b, wherein
Figure BSA00000388341500055
Figure BSA00000388341500056
Figure BSA00000388341500057
λ satisfies
Figure BSA00000388341500058
(0, x) computing repeats this step to expression max, obtains distributing to the bit number between all selection users and each base station;
(4) center processing unit will be distributed to all and select users and bit number between each base station to be transferred to corresponding base station in the cooperative transmission system, and notify corresponding user by corresponding base station with the bit number of distribution;
(5) channel vector of establishing between k user and b the base station is h K, b, k the bit number B that the user notifies according to b base station K, bFrom this user's code library, search and bit number B K, bCorresponding code book C K, b, C K, bIn comprise Individual code word, k user according to
Figure BSA000003883415000510
Obtain code word c K, b, and, repeat this step to b this code word of base station feedback, all base stations obtain the code word of relative users;
(6) each base station in the cooperative transmission system is respectively with the feedback code c that receives K, bBe transferred to center processing unit;
(7) center processing unit finds corresponding code word according to the feedback code index of all base stations that receive, and reconstruct obtains each user's global channel, utilizes all users' global channel, generates the precoding of cooperative transmission system.

Claims (1)

1. feedback code book Bit distribution method towards descending multi-antenna multi-base station cooperation transmission is characterized in that this method comprises with next step:
(1) establish cooperative transmission system and be made up of N base station, each base station configuration M antenna connects by center processing unit between each base station; Dispatch the multi-user in the cooperative transmission system base station, selects K user wherein to serve simultaneously;
(2) the long-time statistical average signal energy of channel in K user's measuring N base station being scheduled out of a plurality of base stations notice and between the user
Figure FSA00000388341400011
J=1 ... K, b=1 ..., N; J user by uplink feedback channel with above-mentioned long-time statistical average signal energy Feed back to b base station in N the base station, b base station is with the long-time statistical average signal energy that receives
Figure FSA00000388341400013
Be transferred to center processing unit;
(3) center processing unit requires γ according to the communication quality of k user's setting of above-mentioned selection k, pass through following formula:
Figure FSA00000388341400014
Calculate the bit number B that distributes between k user and b the base station K, b, wherein
Figure FSA00000388341400016
Figure FSA00000388341400017
λ satisfies
Figure FSA00000388341400018
(x) +(0, x) computing repeats this step to expression max, obtains distributing to the bit number between all selection users and each base station;
(4) center processing unit will be distributed to all and select users and bit number between each base station to be transferred to corresponding base station in the cooperative transmission system, and by corresponding base station the bit number of distribution will be transferred to corresponding user;
(5) channel vector of establishing between k user and b the base station is h K, b, k the bit number B that the user notifies according to b base station K, bFrom this user's code library, search and bit number B K, bCorresponding code book C K, b, C K, bIn comprise
Figure FSA00000388341400019
Individual code word, k user according to
Figure FSA000003883414000110
Obtain code word c K, b, and, repeat this step to b this code word of base station feedback, all base stations obtain the code word of relative users;
(6) each base station in the cooperative transmission system is respectively with the feedback code c that receives K, bBe transferred to center processing unit;
(7) center processing unit finds corresponding code word according to the feedback code index of all base stations that receive, and reconstruct obtains each user's global channel, utilizes all users' global channel, generates the precoding of cooperative transmission system.
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Cited By (3)

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CN102497254A (en) * 2011-12-30 2012-06-13 北京航空航天大学 Channel information feedback method of wireless communication multiple-base-station multi-antenna cooperation transmission
CN103580744A (en) * 2012-08-10 2014-02-12 中兴通讯股份有限公司 Precode generating method and device for inter-cell multi-antenna cooperative system
WO2014056308A1 (en) * 2012-10-12 2014-04-17 华为技术有限公司 Code word feedback method and receiver

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CN101159462A (en) * 2007-11-01 2008-04-09 中国科学技术大学 Limiting feedback precoding interference suppression method of multi-antenna multi-cell system
US20100067604A1 (en) * 2008-09-17 2010-03-18 Texas Instruments Incorporated Network multiple antenna transmission employing an x2 interface
CN101807973A (en) * 2010-03-19 2010-08-18 北京航空航天大学 Formation method of low feedback quantity codebook for single-user multi-base station collaborated system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101159462A (en) * 2007-11-01 2008-04-09 中国科学技术大学 Limiting feedback precoding interference suppression method of multi-antenna multi-cell system
US20100067604A1 (en) * 2008-09-17 2010-03-18 Texas Instruments Incorporated Network multiple antenna transmission employing an x2 interface
CN101807973A (en) * 2010-03-19 2010-08-18 北京航空航天大学 Formation method of low feedback quantity codebook for single-user multi-base station collaborated system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102497254A (en) * 2011-12-30 2012-06-13 北京航空航天大学 Channel information feedback method of wireless communication multiple-base-station multi-antenna cooperation transmission
CN102497254B (en) * 2011-12-30 2014-01-22 北京航空航天大学 Channel information feedback method of wireless communication multiple-base-station multi-antenna cooperation transmission
CN103580744A (en) * 2012-08-10 2014-02-12 中兴通讯股份有限公司 Precode generating method and device for inter-cell multi-antenna cooperative system
CN103580744B (en) * 2012-08-10 2018-03-20 中兴通讯股份有限公司 Prelist code generating method and the device of a kind of minizone multi-antenna cooperative system
WO2014056308A1 (en) * 2012-10-12 2014-04-17 华为技术有限公司 Code word feedback method and receiver
US9319117B2 (en) 2012-10-12 2016-04-19 Huawei Technologies Co., Ltd. Codeword feedback method and receiver

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