CN103457647A - Method and device for shaping double-flow wave beams - Google Patents
Method and device for shaping double-flow wave beams Download PDFInfo
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- CN103457647A CN103457647A CN201210181742XA CN201210181742A CN103457647A CN 103457647 A CN103457647 A CN 103457647A CN 201210181742X A CN201210181742X A CN 201210181742XA CN 201210181742 A CN201210181742 A CN 201210181742A CN 103457647 A CN103457647 A CN 103457647A
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Abstract
The invention provides a method for shaping double-flow wave beams. The method comprises the following steps that A, an uplink channel estimation matrix H 2*8 is acquired according to a received monitored reference signal SRS; B, the product of the uplink channel estimation matrix H 2*8 and a conjugate transpose matrix H 2*8 is calculated to obtain a middle result T 2*2; C, singular value decomposition is conducted on the T 2*2 to obtain a D matrix; D, the matrix product W 8*2 of the conjugate transpose matrix H 2*8 of the uplink channel estimation matrix and the matrix product W8*2 of the D matrix is calculated, and the formula is expressed as W8*2 = H2*8*D; E, phase taking operation is conducted on the matrix product W8*2 to obtain a wave beam shaping weight vector; F, according to the wave beam shaping weight vector obtained by calculation, the sending signals of each user are shaped, and shaped data are sent. Compared with an existing maximum power feature decomposition shaping method (EBB), the method for shaping the double-flow wave beams can obviously reduce computation.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of dual-stream beamforming method and device.
Background technology
The target of wave beam forming is according to system performance index, forms best of breed or distribution to base band (intermediate frequency) signal.Specifically, its main task is signal fadeout and the distortion of being introduced by factors such as space loss, multipath effects in compensation radio transmission process, reduces the interference between co-channel users simultaneously.The operation principle of wave beam forming technology is: the signal sent from a plurality of transmitting terminal antennas is combined at the reception antenna end.
According to the difference of application scenario, generally beam form-endowing method can be divided into to uplink application and downlink applications.No matter be which kind of situation, become the signal relation that vector (MIMO) channel is described user side and base station end in the time of always can be with one.For up link, a plurality of transmitting is in fact K the signal that subscriber equipment sends simultaneously, and base station is used a plurality of antenna elements to receive signal, and it is processed and detects, and the at this moment signal of transmitting terminal distribution is only carried out respectively at each branch road; For down link, base station still may be used a plurality of antenna elements to transmit to the specific user, but subscriber equipment uses single antenna to detect the signal relevant with it, and at this moment receiving unit is reduced to one dimension, and signal combination is also only carried out for one-channel signal.
For the wave beam forming technology, the scope of general its research is from the output of transmitting terminal spread spectrum and modulating unit, input to receiving terminal despreading and demodulating unit, and often the signal distribution unit output is merged to the part between the signal combination unit input in research process, be referred to as wireless mobile channel.Due to the extreme complexity of wireless mobile communications environment, can't obtain the definite description of its input/output relation, the general method that adopts a large amount of measurements and theoretical research to combine, used this channel of limited parametric description.After adopting this method, just can obtain being disturbed the relation of noise cancellation signal and primary signal, and restoring signal to a certain extent accordingly.
The general process of wave beam forming is:
(1) determine Optimality Criteria (cost function) according to the requirement of system performance index (as the error rate, frame error rate), generally this is the function of weight vector and some parameters;
(2) adopt certain method to obtain the parameter needed;
(3) select certain method to solve the optimum solution under this Optimality Criteria, obtain the value of weight vector.
Existing is mainly that maximum power features is decomposed shaping method (EBB) for double-current beam form-endowing method, and its concrete grammar is described below:
At first to spatial correlation matrix R
xxcarry out feature decomposition:
[V，D]=eig(R
xx) （1）
Spatial correlation matrix R
xxthe dimension array antenna unit number that is base station, be generally 8.Then find eigenvalue of maximum and time large characteristic value characteristic of correspondence vector, be required weights.
As can be seen from the above equation, the figuration effect of EBB method depends on the order of accuarcy of channel estimating fully, and without the steering vector of knowing that in advance regional is corresponding, and irrelevant with the footpath number of channel.If many footpaths are arranged in channel, and each self-corresponding arrival bearing relatively disperses, and utilizes so the EBB method can provide the figuration effect in many footpaths.
Although the EBB method can adapt to the environment of multi-path environment and multiple polarization configuration, because its implementation complexity is higher, therefore operand is large is subject to certain restrictions in actual applications.
Summary of the invention
The invention provides a kind of dual-stream beamforming method and device, can realize the wave beam forming to double-current data by lower operand, complexity is lower.
The embodiment of the present invention provides a kind of dual-stream beamforming method, comprises the steps:
A, according to the interception reference signal SRS received, obtain the uplink channel estimation matrix H
2 * 8;
B, calculating uplink channel estimation matrix H
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2;
C, to T
2 * 2carry out singular value decomposition, obtain the D matrix;
The associate matrix H of D, calculating channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D;
E, to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector;
The wave beam forming weight vector that F, basis calculate, carry out figuration and the data after figuration launched transmitting of each user.
The embodiment of the present invention also provides a kind of base station, this base station comprises Physical Uplink Shared Channel PUSCH receiver module, described PUSCH receiver module comprises grouping fast fourier transform FFT unit, reference signal generation unit, separates resource mapping unit, channel estimating unit, demodulating unit, SRS channel estimating unit, the business map unit is conciliate in weight vector computing unit, descrambling unit
The weight vector computing unit comprises:
The first subelement, for calculating the uplink channel estimation matrix H from the SRS channel estimating unit
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2;
The second subelement, for the T that described the first subelement is obtained
2 * 2carry out singular value decomposition, obtain the D matrix;
The 3rd subelement, for calculating the associate matrix H of channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D;
The 4th subelement, for to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector.
As can be seen from the above technical solutions, the present invention utilizes the feature decomposition of 2 * 2 matrixes to obtain the wave beam forming weight vector, replaces the feature decomposition of 8 * 8 matrixes in prior art EBB method, so reduced amount of calculation.
The accompanying drawing explanation
The composition schematic diagram of the PUSCH sending module that Fig. 1 provides for the embodiment of the present invention;
The composition schematic diagram of the PUSCH receiver module that Fig. 2 provides for the embodiment of the present invention;
The dual-stream beamforming method flow diagram that Fig. 3 provides for the embodiment of the present invention;
The simulation performance contrast schematic diagram that Fig. 4 is the present invention program and EBB method.
Embodiment
Clearer for the know-why, characteristics and the technique effect that make technical solution of the present invention, below in conjunction with specific embodiment, the present invention program is described in detail.
The Physical Uplink Shared Channel that the embodiment of the present invention is used (PUSCH) sending module and PUSCH receiver module are respectively as depicted in figs. 1 and 2.Wherein, the PUSCH sending module is positioned at end side, comprising: business map unit 101, scrambling unit 102, modulating unit 103, grouping discrete Fourier transform (DFT) (DFT) unit 104, reference signal generation unit 105, SRS transmitting element 106, resource mapping unit 107 and SC-FDMA baseband processing unit 108.PUSCH sending module and prior art are consistent.
The PUSCH receiver module is positioned at base station side, comprise: fast fourier transform FFT unit 201, reference signal generation unit 202, solution resource mapping unit 203, channel estimating unit 204, demodulating unit 205, SRS channel estimating unit 206, weight vector computing unit 207, descrambling unit 208, separate business map unit 209.The processing that difference with the prior art of the present invention is weight vector computing unit 207 unlike the prior art.
Weight vector computing unit 207 comprises:
The first subelement, for calculating the uplink channel estimation matrix H from SRS channel estimating unit 206
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2;
The second subelement, for the T that described the first subelement is obtained
2 * 2carry out singular value decomposition, obtain the D matrix;
The 3rd subelement, for calculating the associate matrix H of channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D;
The 4th subelement, for to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector.
The dual-stream beamforming method flow that the embodiment of the present invention provides as shown in Figure 3, comprises the steps:
Step 301: according to the interception reference signal (SRS, Sounding Reference Signal) received, obtain the uplink channel estimation matrix.
In this step, the SRS signal comprises interference signal and the noise of the useful signal ,Wai community of this community, and wherein the useful signal of ，Zhe community comprises multi-user's transmitting data and training sequence.Each antenna element of cell base station receives the SRS signal, utilizes the multi-user's who receives training sequence part to carry out the estimation of channel impulse response, forms the uplink channel estimation matrix.About utilizing the SRS signal to obtain the flow process of uplink channel estimation matrix, specifically can, referring to the correlation technique document, not repeat them here.
In the embodiment of the present invention, the uplink channel estimation matrix obtained is designated as to H
k, N, wherein, k launches the antenna element number of SRS signal, the antenna element number that N is base station for the user.Because signal in the embodiment of the present invention is double fluid, so k=2; N=8, mean that the array antenna unit number of base station is 8.
Step 302: calculate channel estimate matrix H
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2.
Step 303: to described intermediate object program T
2 * 2carry out singular value decomposition (SVD), obtain the D matrix.
Step 304: the associate matrix H that calculates channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D.
Step 305: to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector.
Step 306: according to the wave beam forming weight vector calculated, transmitting of each user carried out figuration and the data after figuration are launched.
Under equal conditions, performance is suitable with the EBB method for dual-stream beamforming method provided by the invention, and the scheme of applicable and multiple polarization configuration.Fig. 4 shows the present invention program under space channel Extended Model (SCME, Spatial Channel Model Extension), dual polarized antenna configuration condition and the simulation performance of EBB method.Wherein, abscissa is signal to noise ratio (snr), and unit is decibel (dB), and ordinate is data throughout (Throughput), and unit is bps/hertz (bit/s/Hz).As can be seen from Figure 4, in the situation that signal to noise ratio is identical, the present invention program's data throughout all is greater than the EBB method, show the present invention program on implementation complexity and operand all significantly lower than the EBB method.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (2)
1. a dual-stream beamforming method, is characterized in that, comprises the steps:
A, according to the interception reference signal SRS received, obtain the uplink channel estimation matrix H
2 * 8;
B, calculating uplink channel estimation matrix H
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2;
C, to T
2 * 2carry out singular value decomposition, obtain the D matrix;
The associate matrix H of D, calculating channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D;
E, to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector;
The wave beam forming weight vector that F, basis calculate, carry out figuration and the data after figuration launched transmitting of each user.
2. a base station, this base station comprises Physical Uplink Shared Channel PUSCH receiver module, described PUSCH receiver module comprises grouping fast fourier transform FFT unit, reference signal generation unit, separates resource mapping unit, channel estimating unit, demodulating unit, SRS channel estimating unit, the business map unit is conciliate in weight vector computing unit, descrambling unit, it is characterized in that
The weight vector computing unit comprises:
The first subelement, for calculating the uplink channel estimation matrix H from the SRS channel estimating unit
2 * 8associate matrix H with this matrix
2 * 8* product obtains intermediate object program T
2 * 2;
The second subelement, for the T that described the first subelement is obtained
2 * 2carry out singular value decomposition, obtain the D matrix;
The 3rd subelement, for calculating the associate matrix H of channel estimate matrix
2 * 8* with the matrix product W of described D matrix
8 * 2, formula table is shown W
8 * 2=H
2 * 8* * D;
The 4th subelement, for to described matrix product W
8 * 2do and get phase operation, obtain the wave beam forming weight vector.
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Cited By (6)
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| WO2015143598A1 (en) * | 2014-03-24 | 2015-10-01 | 华为技术有限公司 | Method and apparatus for channel estimation processing |
| CN105515632A (en) * | 2015-11-24 | 2016-04-20 | 航天恒星科技有限公司 | Anti-interference method and device for array antennas |
| WO2017118079A1 (en) * | 2016-01-05 | 2017-07-13 | 中兴通讯股份有限公司 | Method and device for dual-stream beamforming, and base station |
| US9755860B2 (en) | 2016-01-29 | 2017-09-05 | Industrial Technology Research Institute | Method of performing uplink channel estimation and base station using the same |
| WO2017219739A1 (en) * | 2016-06-24 | 2017-12-28 | 电信科学技术研究院 | Method and device for determining beamforming vector |
| WO2019019149A1 (en) * | 2017-07-28 | 2019-01-31 | 华为技术有限公司 | Data dimension reduction method, device and system, computer device, and storage medium |
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| CN102170303A (en) * | 2011-04-20 | 2011-08-31 | 河南省信息咨询设计研究有限公司 | Method, device and system for beamforming smart antenna |
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| CN101615937A (en) * | 2008-06-27 | 2009-12-30 | 中兴通讯股份有限公司 | A kind of multi-antenna emission method and many antennas emitter |
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| WO2015143598A1 (en) * | 2014-03-24 | 2015-10-01 | 华为技术有限公司 | Method and apparatus for channel estimation processing |
| CN105515632A (en) * | 2015-11-24 | 2016-04-20 | 航天恒星科技有限公司 | Anti-interference method and device for array antennas |
| CN105515632B (en) * | 2015-11-24 | 2019-03-08 | 航天恒星科技有限公司 | Array antenna anti-disturbance method and device |
| WO2017118079A1 (en) * | 2016-01-05 | 2017-07-13 | 中兴通讯股份有限公司 | Method and device for dual-stream beamforming, and base station |
| US9755860B2 (en) | 2016-01-29 | 2017-09-05 | Industrial Technology Research Institute | Method of performing uplink channel estimation and base station using the same |
| TWI609577B (en) * | 2016-01-29 | 2017-12-21 | 財團法人工業技術研究院 | Method of performing uplink channel estimation and base station using the same |
| CN107547117A (en) * | 2016-06-24 | 2018-01-05 | 电信科学技术研究院 | A kind of method and device for determining beam shaping vector |
| WO2017219739A1 (en) * | 2016-06-24 | 2017-12-28 | 电信科学技术研究院 | Method and device for determining beamforming vector |
| WO2019019149A1 (en) * | 2017-07-28 | 2019-01-31 | 华为技术有限公司 | Data dimension reduction method, device and system, computer device, and storage medium |
| CN110832949A (en) * | 2017-07-28 | 2020-02-21 | 华为技术有限公司 | Data dimension reduction method, device and system, computer equipment and storage medium |
| EP3641487A4 (en) * | 2017-07-28 | 2020-04-29 | Huawei Technologies Co., Ltd. | Data dimension reduction method, device and system, computer device, and storage medium |
| CN110832949B (en) * | 2017-07-28 | 2021-08-20 | 华为技术有限公司 | Data dimension reduction method, device and system, computer equipment and storage medium |
| US11234294B2 (en) | 2017-07-28 | 2022-01-25 | Huawei Technologies Co., Ltd. | Data dimension reduction method, apparatus, and system, computer device, and storage medium |
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