CN102547953A - Method for obtaining beam forming gain - Google Patents

Method for obtaining beam forming gain Download PDF

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CN102547953A
CN102547953A CN2010105938566A CN201010593856A CN102547953A CN 102547953 A CN102547953 A CN 102547953A CN 2010105938566 A CN2010105938566 A CN 2010105938566A CN 201010593856 A CN201010593856 A CN 201010593856A CN 102547953 A CN102547953 A CN 102547953A
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calculate
beam forming
subband
gain
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CN102547953B (en
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张曦林
张志伟
李婧
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Potevio Institute of Technology Co Ltd
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Abstract

The invention provides a method for obtaining beam forming gain, which is characterized in that by utilizing the characteristic that a receiving end does not generate power gain when a CRS (cell-specific reference signal) is transmitted in a diversity manner, the method obtains the beam forming gain by comparing the signal-to-interference-noise ratio of a receiving end when a downlink data channel adopts a beam forming manner with the signal-to-interference-noise ratio of the receiving end when the CRS is transmitted in a diversity manner, so that processing influences of radio and medium frequencies can be effectively eliminated, and accuracy of the obtained beam forming gain is ensured.

Description

A kind of method that obtains the wave beam forming gain
Technical field
The present invention relates to the wave beam forming technology in the GSM, particularly relate to a kind of method that obtains the wave beam forming gain.
Background technology
At present, in Long Term Evolution (LTE) system, base station (eNB) need adjust the channel quality information (CQI) that subscriber equipment (UE) reports.The CQI that UE reports is based on sub-district special reference signal (Cell-Specific Reference Signal; CRS) calculate; As far as dual-polarized antenna array; CRS sends general transmission branch collection (SFBC) mode that adopts 2 ports, and promptly each group poliarizing antenna adopts fixing wave beam forming gain map to an antenna port.In the existing system, according to formula S INR CQI_Index=SINR CRS-SFBCBF_GainOffset calculates corresponding Signal to Interference plus Noise Ratio (SINR) the value SINR of adjusted CQI value CQI_Index, wherein, SINR CRS-SFBCBe that UE measures the Signal to Interference plus Noise Ratio of CRS signal, BF_Gain is the wave beam forming gain, and Offset is used to make the Block Error Rate of receiving terminal to meet the adjustment parameter of certain condition.Because CQI and SINR that UE reports CRS-SFBCTherefore correspondence, uses SINR here CRS-SFBCReplace the CQI value that UE reported, correspondingly, obtain the corresponding Signal to Interference plus Noise Ratio value SINR of adjusted CQI value according to above-mentioned formula CQI_IndexAbove-mentioned SINR CRS-SFBCIn will comprise a factor factor, this factor is to be produced by the coefficient element of pseudo channel, when suitable Offset value is set, also need consider to offset through Offset the influence of factor factor.Particularly, in practical application, the ACK/NACK that the base station will combine UE to report according to the estimated value to factor constantly adjusts the Offset value, makes Offset can balance out the influence of this factor factor, makes SINR CQI_IndexFinally being stabilized in one satisfies in the given error rate scope.
At present, in single dual-layer beam forming transmission plan of TDD-LTE, the gain of the wave beam forming of transmitting antenna end obtains according to spatial correlation matrix.Detailed process is: (Sounding Reference Signal SRS) measures up channel, according to the reciprocity of uplink and downlink channel in the TDD system, utilizes the up channel that measures to replace down channel through Sounding Reference Signal.Adopt the characteristic value decomposition algorithm, the eigenvalue of maximum (to the single current beam shaping) or the maximum of taking off the spatial correlation matrix of capable channel matrix reach time big characteristic value (to dual-layer beam forming) characteristic of correspondence vector as beam shape-endowing weight value.Be the wave beam forming gain with the corresponding characteristic value of the beam shape-endowing weight value that is obtained.Distinguishingly, in multi-user-multiple-input, multiple-output (MU-MIMO) system, no longer be characteristic vector because user pairing, beam shape-endowing weight value are arranged based on beam shaping, the wave beam forming gain also no longer is a characteristic value, but according to formula BF_Gain i=‖ H iW i‖ 2Obtain each user's wave beam forming gain BF_Gain i, wherein, H iBe i user's down channel matrix, W iIt is i user's beam shape-endowing weight value.
This shows that the calculating of wave beam figuration gain is that the up channel matrix that directly utilizes SRS to measure is realized in the existing system, is specially the characteristic value of the spatial correlation matrix of up channel matrix.And in product is realized,, can carry out a convergent-divergent to the data of antenna opening for guaranteeing to hit the range of linearity frequently.The SRS channel estimation results of the eNB end that obtains thus can receive the influence of this zoom factor, and this zoom factor does not reflect the variation of channel, and generally is to be difficult to accurate estimation.Shown in formula
Figure BSA00000389818600021
.Wherein, δ is a zoom factor;
Figure BSA00000389818600022
is the channel matrix behind the convergent-divergent, and H is the channel matrix before the convergent-divergent.This moment is if do relevant with
Figure BSA00000389818600023
; The characteristic value that spatial correlation matrix decomposes out gains as beam shaping; Differ greatly with the actual channel situation; Like this; Will inevitably make and utilize the result of this wave beam forming gain carrying out CQI adjustment that very large deviation is arranged, thereby influence eNB CQI adjustment ground accuracy.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that obtains the wave beam forming gain, and the wave beam forming that is obtained gain has higher accuracy.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of method that obtains the wave beam forming gain, this method may further comprise the steps:
A, carry out the uplink channel estimation on each subcarrier in the system or the subband, obtain the up channel matrix
Figure BSA00000389818600024
on each subcarrier or the subband
b, according to the
Figure BSA00000389818600031
to obtain each sub-carrier or sub-band downlink channel matrix
Figure BSA00000389818600032
using the
Figure BSA00000389818600033
calculate the downlink data channel using beamforming transmission of each sub-carrier or sub-band receiver SINR
Figure BSA00000389818600034
using the
Figure BSA00000389818600035
calculated for each sub- carriers or sub-band reference signal proprietary cell (CRS) transmission channel matrix
Figure BSA00000389818600036
using the
Figure BSA00000389818600037
calculate CRS using transmit diversity at each sub-carrier or sub-band receiver SINR
Figure BSA00000389818600038
C, calculate said
Figure BSA00000389818600039
relative value, gain as the wave beam forming on each subcarrier or the subband with said relative value for said
Figure BSA000003898186000310
.
In sum; The method of the acquisition wave beam forming gain that the present invention proposes; Utilize CRS to adopt when sending diversity mode and do not produce these characteristics of power gain at receiving terminal; The mode that the Signal to Interference plus Noise Ratio of the receiving terminal when downstream data channel being adopted wave beam forming send and CRS adopt the Signal to Interference plus Noise Ratio that sends the receiving terminal when dividing collection to compare obtains the wave beam forming gain, hits the influence of handling frequently thereby can effectively eliminate, and guarantees the accuracy that resulting wave beam forming gains.
Description of drawings
Fig. 1 is the schematic flow sheet of the embodiment of the invention one.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment that the present invention is done to describe in detail further below.
Core concept of the present invention is: beam shaping is gained this receiving terminal gross power with respect to the power gain of the gross power of making a start, embody with relative mode.So, can effectively eliminate through relative form of calculation and hit the influence of frequently handling channel.
Fig. 1 is the schematic flow sheet of the embodiment of the invention one.As shown in Figure 1, this embodiment may further comprise the steps:
Step 101, carry out the uplink channel estimation on each subcarrier in the system or the subband, obtain the up channel matrix
Figure BSA000003898186000311
on each subcarrier or the subband
This step is used for the up channel matrix on each subcarrier of computing system or the subband; So that after this reciprocity of down channel obtains the corresponding downstream channel matrix under the basis; And then the Signal to Interference plus Noise Ratio of the receiving terminal on each subcarrier or the subband can obtain downstream data channel respectively and adopt wave beam forming to send according to the down channel matrix time, and CRS adopts the Signal to Interference plus Noise Ratio that sends the receiving terminal on each subcarrier when dividing collection or the subband.
The concrete implementation method of this step is grasped by those skilled in the art, repeats no more at this.
Step 102, according to the to obtain each sub-carrier or sub-band downlink channel matrix
Figure BSA00000389818600042
using the
Figure BSA00000389818600043
calculate the downlink data channel using beamforming transmission of each sub-carrier or sub-band receiver SINR
Figure BSA00000389818600044
using the calculate the sub-carrier or sub-band reference signal proprietary cell (CRS) transmission channel matrix
Figure BSA00000389818600046
using the
Figure BSA00000389818600047
calculate CRS using transmit diversity at each sub-carrier or sub-band receiver SINR
Figure BSA00000389818600048
This step; The Signal to Interference plus Noise Ratio of the receiving terminal the when downstream data channel that obtains the up channel matrix that is used for utilizing step 101 to obtain adopts wave beam forming to send on each subcarrier or the subband; And the Signal to Interference plus Noise Ratio of CRS receiving terminal on each subcarrier or the subband when adopt to send dividing collection, so that in step 103, obtain the wave beam forming gain on each subcarrier or the subband through the relative value of calculating both.
Here; Utilize that
Figure BSA00000389818600049
obtains
Figure BSA000003898186000410
and utilize
Figure BSA000003898186000411
and calculate
Figure BSA000003898186000412
to be those skilled in the art and to grasp, repeat no more at this.
Here; According to the concrete wave beam forming mode that adopts in the practical application is single current or dual-stream beamforming, the method for calculating
Figure BSA000003898186000413
particularly can for:
1) when adopting the single current wave beam forming:
Utilize said
Figure BSA000003898186000414
According to
Figure BSA000003898186000415
Calculate
Figure BSA000003898186000416
Wherein, w BFForming coefficient for the transfer of data wave beam forming;
Utilize said
Figure BSA000003898186000417
According to
Figure BSA000003898186000418
Calculate said
Figure BSA000003898186000419
Wherein, σ 2Noise variance for every antenna of receiving terminal.
2) when adopting dual-stream beamforming:
Utilize said
Figure BSA000003898186000420
Calculate
Figure BSA000003898186000421
Two eigenvalue 1And λ 2, and λ 1And λ 2Difference characteristic of correspondence vector w 1And w 2
Calculate
Figure BSA00000389818600052
according to
Figure BSA00000389818600051
Utilize
Figure BSA00000389818600053
According to
Figure BSA00000389818600054
Calculate the Signal to Interference plus Noise Ratio of the corresponding receiving terminal of first stream
Figure BSA00000389818600055
Wherein, σ 2Noise variance for every antenna of receiving terminal;
Using the
Figure BSA00000389818600056
By
Figure BSA00000389818600057
to calculate the second stream corresponds to the receiving side of the signal to interference noise ratio.
Each that can obtain on subcarrier or the subband through said method flows the Signal to Interference plus Noise Ratio of corresponding receiving terminal, in subsequent step 103, to the corresponding Signal to Interference plus Noise Ratio of each stream, calculates wave beam forming gain of the respectively stream on each subcarrier or the subband with respectively.
In this step, can basis
Figure BSA00000389818600058
The Signal to Interference plus Noise Ratio of the receiving terminal when calculating CRS employing transmission branch collection on each subcarrier or the subband
Figure BSA00000389818600059
Wherein, σ 2Noise variance for every antenna of receiving terminal.
Adopt the data channel of beam shaping, generally adopt the CRS signal of two-port, under the situation that two antennas receive,
Figure BSA000003898186000510
h I, jIt is the channel coefficients between j port and the i root reception antenna.
Step 103, calculate said
Figure BSA000003898186000511
relative value, gain as the wave beam forming on each subcarrier or the subband with said relative value for said
Figure BSA000003898186000512
.
Here; Because CRS adopts when sending diversity mode and does not produce power gain at receiving terminal in practical application; Therefore; The Signal to Interference plus Noise Ratio of the receiving terminal when adopting wave beam forming to send downstream data channel and CRS adopt the Signal to Interference plus Noise Ratio that sends the receiving terminal when dividing collection to compare, and get its relative value and can obtain the beam shaping gain.And is identical owing to hit the channel frequently handled after institute influence to the coefficient that calculating produced of these two signal to noise ratios, so the relative value of getting two signal to noise ratios just can cut the influence of this coefficient, the accuracy that the wave beam forming of having guaranteed to be obtained gains.In addition, adopt the mode of relative value to obtain the wave beam forming gain, can also make the base station need not adjust the Offset value, to offset the influence of factor factor as traditional method.Because; The factor that that factor that
Figure BSA000003898186000513
contained and CQI report contained cancels out each other; Do not need to estimate again this factor, or adjust by Offset and to offset this factor.
Here need to prove, in practical application, when said With said
Figure BSA00000389818600062
When representing, calculate said with the form of non-dB
Figure BSA00000389818600063
For said
Figure BSA00000389818600064
Relative value the time, adopt the mode of ratio to realize, and when said
Figure BSA00000389818600065
With said
Figure BSA00000389818600066
When representing, then adopt the mode of difference to realize with the form of dB, promptly according to
Figure BSA00000389818600067
Calculate said BF_Gain s
In practical application; In order to make estimated CRS received signal to noise ratio more stable; Further; The Signal to Interference plus Noise Ratio of the receiving terminal in the time of can adopting transmission to divide collection to the CRS that calculates in the step 102 earlier on each subcarrier or the subband is averaged, and gains based on the wave beam forming on each subcarrier of this mean value calculation or the subband then.Specific as follows:
According to the Signal to Interference plus Noise Ratio mean value
Figure BSA00000389818600069
of the receiving terminal on all subcarriers and the subband in
Figure BSA00000389818600068
computing system wherein; S is the carrier wave sequence number, and S is all subcarriers and the number of subband in the system.
Like this; The wave beam forming that calculates on each subcarrier or the subband gains for
Figure BSA000003898186000610
wherein, and said
Figure BSA000003898186000611
and said
Figure BSA000003898186000612
representes with the form of dB.
In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. one kind obtains the method that wave beam forming gains, and it is characterized in that this method may further comprise the steps:
A, carry out the uplink channel estimation on each subcarrier in the system or the subband, obtain the up channel matrix
Figure FSA00000389818500011
on each subcarrier or the subband
b, according to the
Figure FSA00000389818500012
to obtain each sub-carrier or sub-band downlink channel matrix
Figure FSA00000389818500013
using the
Figure FSA00000389818500014
calculate the downlink data channel using beamforming sent each subcarrier or sub- Bring the receiving end SINR
Figure FSA00000389818500015
using the
Figure FSA00000389818500016
calculated for each sub-carrier or proprietary cell subband reference signals (CRS) transmission channel matrix Utilization state
Figure FSA00000389818500018
Calculation CRS when using transmit diversity sub-carriers or sub-bands of the receiving side of the SINR
Figure FSA00000389818500019
C, calculate said
Figure FSA000003898185000110
relative value, gain as the wave beam forming on each subcarrier or the subband with said relative value for said
Figure FSA000003898185000111
.
2. method according to claim 1 is characterized in that, said step c is:
When said
Figure FSA000003898185000112
With said
Figure FSA000003898185000113
When representing with the form of dB, according to
Figure FSA000003898185000114
Compute beam figuration gain BF_Gain s
3. method according to claim 1 is characterized in that, basis among the step b
Figure FSA000003898185000115
Calculate said
Figure FSA000003898185000116
Wherein, σ 2Noise variance for every antenna of receiving terminal.
4. method according to claim 3 is characterized in that, said step c is:
According to the Signal to Interference plus Noise Ratio mean value
Figure FSA000003898185000118
of the receiving terminal on all subcarriers and the subband in computing system wherein; S is the carrier wave sequence number, and S is all subcarriers and the number of subband in the system;
When said
Figure FSA000003898185000119
With said When representing with the form of dB, according to
Figure FSA000003898185000121
Calculate said BF_Gain s
5. method according to claim 1; It is characterized in that; When adopting the single current wave beam forming, calculating said
Figure FSA00000389818500021
is among the step b:
Utilize said According to Calculate
Figure FSA00000389818500024
Wherein, w BFForming coefficient for the transfer of data wave beam forming;
Utilize said
Figure FSA00000389818500025
According to
Figure FSA00000389818500026
Calculate said
Figure FSA00000389818500027
Wherein, σ 2Noise variance for every antenna of receiving terminal;
When adopting dual-stream beamforming, calculating said
Figure FSA00000389818500028
is among the step b:
Utilize said
Figure FSA00000389818500029
Calculate Two eigenvalue 1And λ 2, and λ 1And λ 2Difference characteristic of correspondence vector w 1And w 2
In accordance with the
Figure FSA000003898185000211
calculate
Use
Figure FSA000003898185000213
By
Figure FSA000003898185000214
Calculate the receiving end of a stream corresponding to the SINR
Figure FSA000003898185000215
Using the
Figure FSA000003898185000216
by calculate the second stream corresponding receiver SINR.
CN201010593856.6A 2010-12-09 2010-12-09 Method for obtaining beam forming gain Expired - Fee Related CN102547953B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015070631A1 (en) * 2013-11-15 2015-05-21 华为技术有限公司 Downlink sinr estimation method and base station
CN106162727A (en) * 2015-03-31 2016-11-23 北京邮电大学 Method, little base station and the macro base station connected set up by subscriber equipment
CN107342836A (en) * 2017-03-17 2017-11-10 深圳大学 Weighting sparse constraint robust ada- ptive beamformer method and device under impulsive noise
CN110870216A (en) * 2017-07-14 2020-03-06 华为技术有限公司 Beam forming method and device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101686071A (en) * 2008-09-28 2010-03-31 华为技术有限公司 Method for transmitting and receiving channel quality information and device thereof
CN101753190A (en) * 2008-12-09 2010-06-23 中兴通讯股份有限公司 Channel quality indictor (CQI) correcting method and device in LTE emission mode 7
CN101841357A (en) * 2009-03-16 2010-09-22 夏普株式会社 Downlink data transmission method, base station and user equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101686071A (en) * 2008-09-28 2010-03-31 华为技术有限公司 Method for transmitting and receiving channel quality information and device thereof
CN101753190A (en) * 2008-12-09 2010-06-23 中兴通讯股份有限公司 Channel quality indictor (CQI) correcting method and device in LTE emission mode 7
CN101841357A (en) * 2009-03-16 2010-09-22 夏普株式会社 Downlink data transmission method, base station and user equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015070631A1 (en) * 2013-11-15 2015-05-21 华为技术有限公司 Downlink sinr estimation method and base station
CN104639271B (en) * 2013-11-15 2017-04-26 华为技术有限公司 Downlink SINR estimation method and base station
CN106162727A (en) * 2015-03-31 2016-11-23 北京邮电大学 Method, little base station and the macro base station connected set up by subscriber equipment
CN106162727B (en) * 2015-03-31 2019-08-27 北京邮电大学 User equipment establishes method, small base station and the macro base station of connection
CN107342836A (en) * 2017-03-17 2017-11-10 深圳大学 Weighting sparse constraint robust ada- ptive beamformer method and device under impulsive noise
CN107342836B (en) * 2017-03-17 2019-04-23 深圳大学 Weighting sparse constraint robust ada- ptive beamformer method and device under impulsive noise
CN110870216A (en) * 2017-07-14 2020-03-06 华为技术有限公司 Beam forming method and device
CN110870216B (en) * 2017-07-14 2021-06-15 华为技术有限公司 Beam forming method and device
US11265054B2 (en) 2017-07-14 2022-03-01 Huawei Technologies Co., Ltd. Beamforming method and device

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