CN103270704A - Self-adaptive multiple streams beamforming method and base station - Google Patents

Self-adaptive multiple streams beamforming method and base station Download PDF

Info

Publication number
CN103270704A
CN103270704A CN2011800613221A CN201180061322A CN103270704A CN 103270704 A CN103270704 A CN 103270704A CN 2011800613221 A CN2011800613221 A CN 2011800613221A CN 201180061322 A CN201180061322 A CN 201180061322A CN 103270704 A CN103270704 A CN 103270704A
Authority
CN
China
Prior art keywords
base station
fluxion
beam forming
wave beam
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011800613221A
Other languages
Chinese (zh)
Inventor
张翼
周华
吴建明
郭爱煌
于洪林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of CN103270704A publication Critical patent/CN103270704A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

A self-adaptive multiple streams beamforming method and a base station are provided in the embodiments of the present invention. The method includes the following steps: the base station determines a channel matrix of a downlink according to the information transmitted by a user terminal (101); the base station calculates channel capacities corresponding to different numbers of the beamforming streams according to the channel matrix (102); according to the calculation results of the channel capacity, the base station selects the number of the beamforming streams corresponding to the maximum channel capacity to perform a downlink beamforming (103). The method and base station provided in the embodiments of the present invention, by extending a prior dual streams beamforming algorithm to the multiple streams beamforming algorithm and determines the number of the beamforming streams according to the channel capacities, realizes self-adaptive transmission of the beamforming, and increases system flexibility

Description

Adaptive multi-flow beam forming method and base station
Adaptive multi-flow beam forming method and station technology field
The present invention relates to wireless communication field, and in particular to a kind of adaptive multi-flow beam forming method of wireless communication system downlink and base station.Background technology
LTE-A (the follow-up evolution of LTE- Advanced, LTE）It is a kind of candidate scheme of 4G standards, MIMO (Multiple-Input Multiple-Out-put, multiple-input and multiple-output）It is the key technology necessarily used in LTE-A.Compared to LTE (Long Term Evolution, Long Term Evolution）, multiple antennas Enhanced Technology is the emphasis of LTE-A standardization.LTE-A introduces higher antenna configuration (8Tx DL) and more advanced multiple antennas output mode, such as multithread, multi-user, multi-flow beam forming on this basis, multiuser MIMO technology will further improve the capacity and the availability of frequency spectrum of system.
Beamforming technique can carry out Signal Pretreatment according to the characteristic of channel of user, with the ability for expanding covering, raising power system capacity, reduction interference.Channel condition information CSI (Channel State Information) is fed back to transmitting terminal by the receiving terminal of mimo system, is then carried out pre-encode operation to transmission information, can be greatly enhanced MIMO systematic functions.
In LTE agreement, MIMO/SA (Smart Antenna, smart antenna）Technology is mainly reflected on MIMO wave beam formings.From the single current wave beam forming (single beamforming) in Rel-8 to the dual-stream beamforming technology (dual-layer beamforming) in Rel-9, again to the multi-flow beam forming technology (multi-layer beamforming) in LTE-A, wave beam forming shows great advantage in lifting system performance.In LTE communication system, beamforming technique is applied to PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel）Data transfer.
Inventor has found during the present invention is realized, using single user multi-flow beam forming technology, unique user can be caused at a time to carry out multiple data stream transmittings, figuration gain and spatial multiplex gains are obtained simultaneously, so as to obtain the transmission rate bigger than traditional single current beamforming technique.Therefore, the multi-flow beam forming technology of research single user has great importance.
It should be noted that the introduction to technical background is intended merely to the convenient explanation clear, complete to technical scheme progress above, and facilitates the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be in this hair Bright background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of adaptive multi-flow beam forming method and base station, by extending existing dual-stream beamforming algorithm to multithread beamforming algorithm, and using channel capacity as foundation, determine wave beam forming fluxion, the Adaptive Transmission of wave beam forming is realized, to improve the flexibility of system.
One side according to embodiments of the present invention there is provided a kind of adaptive multi-flow beam forming method, wherein, methods described includes：
The information that base station is sent according to user terminal determines the channel matrix of downlink；
Base station calculates the different corresponding channel capacities of wave beam forming fluxion according to the channel matrix；
Base station is according to the result of calculation of channel capacity, the maximum corresponding wave beam forming fluxion progress down beam shaping of selection channel capacity.
Second aspect according to embodiments of the present invention there is provided a kind of base station, wherein, the base station includes：Determining unit, its information for being used to be sent according to user terminal determines the channel matrix of downlink；
Computing unit, its channel matrix determined according to the determining unit calculates the different corresponding channel capacities of wave beam forming fluxion；
Selecting unit, it carries out down beam shaping according to result of calculation of the computing unit to channel capacity, the maximum corresponding wave beam forming fluxion of selection channel capacity.
3rd aspect according to embodiments of the present invention is there is provided a kind of computer-readable program, wherein when performing the program in a base station, the program causes computer to perform foregoing adaptive multi-flow beam forming method in the base station.
4th aspect according to embodiments of the present invention is there is provided a kind of storage medium for the computer-readable program that is stored with, and the wherein computer-readable program causes computer to perform foregoing adaptive multi-flow beam forming method in a base station.
The beneficial effect of the embodiment of the present invention is：By extending existing dual-stream beamforming algorithm to multithread beamforming algorithm, and using channel capacity as foundation, wave beam forming fluxion is determined, the Adaptive Transmission of wave beam forming is realized, the flexibility of system is improved.
With reference to explanation hereinafter and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, the principle for specifying the present invention can be in adopted mode.It should be understood that embodiments of the present invention are not so limited in scope. In the range of the spirit and terms of appended claims, embodiments of the present invention include many changes, modifications and equivalent.Described for a kind of embodiment and/or the feature that shows can be used in same or similar mode in one or more other embodiments, it is combined with feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term " include/include " refers to the presence of feature, one integral piece, step or component when being used herein, but it is not precluded from the presence or additional of one or more further features, one integral piece, step or component.Brief description of the drawings
Many aspects of the present invention may be better understood with reference to following accompanying drawing.Part in accompanying drawing is not proportional drafting, and is intended merely to show the principle of the present invention.For the ease of showing and describing some parts of the present invention, may to be exaggerated Huo Shrink small for corresponding part in accompanying drawing.The element and feature that element and feature described in a kind of accompanying drawing or embodiment of the present invention can be shown in one or more other accompanying drawings or embodiment are combined.In addition, in the accompanying drawings, similar label represents corresponding part in several accompanying drawings, and may be used to indicate the corresponding component used in more than one embodiment.In the accompanying drawings：
Fig. 1 is a kind of flow chart of adaptive multi-flow beam forming method provided in an embodiment of the present invention；
Fig. 2 is the method flow diagram of the corresponding channel capacity of calculating different beams figuration fluxion in embodiment illustrated in fig. 1；Fig. 3 is the method flow diagram for the channel capacity that each wave beam forming fluxion is determined in embodiment illustrated in fig. 2；Fig. 4 is a kind of base station composition schematic diagram provided in an embodiment of the present invention.Embodiment
Referring to the drawings, by following specification, the foregoing and further feature of the embodiment of the present invention will be apparent.These embodiments are exemplary, are not limitations of the present invention.In order that those skilled in the art can easily understand that the principle and embodiment of the present invention, embodiments of the present invention are illustrated by taking the adaptive multi-flow beam forming method of single user in LET-A systems as an example, it is to be understood that, the embodiment of the present invention is not limited to said system, is applicable for the other systems for being related to multi-flow beam forming.
Embodiment 1
Fig. 1 is a kind of flow chart of adaptive multi-flow beam forming method provided in an embodiment of the present invention, refer to Fig. 1, this method includes：
Step 101:The information that base station is sent according to user terminal determines the channel matrix of downlink； Step 102:Base station calculates the different corresponding channel capacities of wave beam forming fluxion according to the channel matrix；Step 103:Base station is according to the result of calculation of channel capacity, the maximum corresponding wave beam forming fluxion progress down beam shaping of selection channel capacity.
In the present embodiment, after base station determines wave beam forming fluxion, it is possible to notify the wave beam forming fluxion to user terminal, so that user terminal carries out the processing of corresponding data transmit-receive according to the wave beam forming fluxion.Wherein, the wave beam forming fluxion of determination is notified the method to user terminal to have much by base station, for example, the wave beam forming fluxion determined is indicated by sending a new message to user terminal, the wave beam forming fluxion of determination is either indicated using the reserved field in the existing message sent to user terminal or by other methods.It is merely illustrative above, the present embodiment is not in this, as limitation.
In a step 101, base station, according to the up-downgoing reciprocity of LTE-A TDD systems, can calculate the channel matrix of downlink according to the channel impulse response of uplink user.For example, base station is according to detection reference signal (the Sounding Reference Signal of reporting of user, SRS), determine the channel condition information of up-link, the channel condition information of downlink is determined further according to up-downgoing reciprocity, it is possible thereby to determine the channel matrix of downlink.In a step 101, base station can also be according to the other information of reporting of user, to determine the channel matrix of downlink.For example, user can directly report the channel condition information of its downlink to base station, thus base station can also determine the channel matrix of downlink.
In one embodiment, it is assumed that base station（ENodeB) side uses N root antennas, user terminal（UE) side uses M root antennas.For up-link, UE sides use M roots antenna transmission signal in turn, and eNodeB sides are received simultaneously using N roots antenna.Shellfish, base station can using the processing mode for merging channel estimation, by continuous N ' obtained channel estimation of individual moment merges and obtains channel matrix： H = [/¾ h2 … hM].Wherein, M ' can be identical with M, can also be different.
In a step 102, base station can calculate the corresponding channel capacity of different beams figuration fluxion by the method shown in Fig. 2, refer to Fig. 2, this method includes：
Step 201:Base station determines the wave beam forming fluxion for needing to calculate channel capacity；
Wherein, base station can determine to need to calculate the fluxion of the wave beam forming of channel capacity according to channel matrix.For example, base station can be using the smaller in the antenna number of the antenna number of base station side and user side as the maximum wave beam forming fluxion of calculating channel capacity is needed, it is determined that it is single current to the maximum wave beam forming fluxion to need to calculate the wave beam forming fluxion of channel capacity.Still exemplified by foregoing, if N<M, it is determined that the wave beam forming fluxion for needing to calculate wave beam forming flow is 1 N;If N>M, it is determined that need calculate wave beam forming flow wave beam forming fluxion be 1〜M.For example, for the matrixes of 2 X 4, it is necessary to which the wave beam forming fluxion for calculating channel capacity is single current and double fluid, for the matrixes of 4 X 4, it is necessary to which the wave beam forming fluxion for calculating channel capacity is single current, double fluid, three streams and four streams, by that analogy.
Step 202:Base station is decomposed using singular value decomposition SVD (Sigular Value Decomposition) decomposition method to the channel matrix, regard the column vector of the right singular matrix after decomposition as wave beam forming weight vectors；Wherein, the channel matrix determined using SVD decomposition methods to step 101 is decomposed, and can be expressed as follows： H = U∑VH。
Wherein, H is the channel matrix that step 101 is determined,！！Two ^, ^ ...！！^ is left singular matrix, V=[vp> VAi] it is right singular matrix, ∑ is diagonal matrix, diagonal element, ^ ... ^^ is singular value.In the present embodiment, wave beam forming weight vectors are used as using the column vector of right singular matrix.
Step 203:Base station handles vector according to the weighting of the wave beam forming weight vectors and receiving terminal, calculates to the channel capacity for each the wave beam forming fluxion that should determine that.
Wherein, base station can first set up the receipt signal model of a receiving terminal, based on the receipt signal model, calculate to the channel capacity for each the wave beam forming fluxion that should determine that.
Wherein, the receipt signal model can be according to least mean-square error MMSE (Minimum Mean Square
Error) acceptance criteria is set up.In one embodiment of the receipt signal model, it is assumed that the signal that UE side joints are received is：
y = HFx + n。
Wherein, H is channel matrix, for example, can be M x N channel matrixes, and F is wave beam forming weight vectors, and X is sends signal, and n is noise.
In the receipt signal model, it is assumed that the noise average power of receiving terminal is NQ, and it is E (x to define the power of transmissionH x) = PT, power mean allocation between multiple data flows.
In step 203, the channel capacity for each wave beam forming fluxion that base station calculating correspondence step 201 is determined can realize that refer to Fig. 3, this method includes by the method shown in Fig. 3：
Step 301:Base station determines the corresponding equivalent channel matrix of current beam figuration fluxion according to the corresponding wave beam forming weight vectors of current beam figuration fluxion；
Wherein, according to wave beam forming weight vectors F, it may be determined that the equivalent channel matrix of channel matrix that step 101 is determined is：
fi = HF。 According to step 202, H can be broken down into [/ ∑ VH, then the U, ∑ and F of correspondence current beam figuration fluxion are substituted into above formula, you can obtain the equivalent channel matrix.
Step 302:Base station calculates the weighting processing vector of the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion according to the equivalent channel matrix；
Where it is assumed that receiving terminal（UE ends）Using based on least mean-square error（MMSE) receive, then the weighting processing vector of the receiving terminal can be expressed as：
Wherein, it is the equivalent channel matrix of wave beam forming, can is the equivalent channel matrix of foregoing determination in the present embodiment. N.It is the noise average power of the receiving terminal determined according to receipt signal model, is the transmission signal power determined according to receipt signal model, I=F " F are unit matrixs.
Step 303:Base station handles vector according to the weighting of the equivalent channel matrix and the receiving terminal, and the signal to noise ratio of receiving terminal, calculate the Signal to Interference plus Noise Ratio SINR (Signal to Interference plus Noise Ratio) of each circuit-switched data stream of correspondence current beam figuration fluxion；
Wherein, if to calculate single current beamf ormed channels capacity, the SINR of data flow all the way is calculated；If calculating dual-stream beamforming channel capacity, the SINR of two paths of data stream is calculated;If calculating three stream beamf ormed channels capacity, the SINR of three circuit-switched data streams is calculated, by that analogy.Wherein, to choose which circuit-switched data stream to calculate its SINR, can usually be determined according to the diagonal element in the diagonal matrix after being decomposed to the channel matrix that step 101 is determined, according to the order of diagonal element from big to small, to select corresponding data flow.
For example, when calculating the SINR of data flow all the way, the maximum corresponding right unusual column vector of diagonal element of selection diagonal matrix intermediate value calculates the SINR of the corresponding data flow of wave beam forming weight vectors as wave beam forming weight vectors;When calculating the SINR of two paths of data stream, the forward corresponding unusual column vector in two right sides of two diagonal elements of selection diagonal matrix intermediate value calculates the SINR of the corresponding each circuit-switched data stream of the wave beam forming weight vectors as wave beam forming weight vectors;By that analogy.
Step 304:Base station calculates the channel capacity of the channel of each circuit-switched data stream of correspondence according to the SINR of each circuit-switched data stream of correspondence current beam figuration fluxion；
Wherein, the SINR of each circuit-switched data stream of correspondence is obtained, you can calculate the channel capacity for the channel for obtaining this corresponding circuit-switched data stream accordingly.Circular can be realized by existing means, will not be repeated here.
Step 305:Base station calculates total channel capacity of the correspondence current beam figuration fluxion according to the channel capacity of the channel of each circuit-switched data stream of correspondence. Wherein, the channel capacity phase power mouthful of the channel to the corresponding each circuit-switched data stream of the current beam figuration fluxion is passed through, you can obtain total channel capacity under the current beam figuration fluxion.
In the present embodiment, for single current wave beam forming, because only that data flow all the way, therefore the interference between data flow will not be produced, the filtration combined weighted interference of MMSE can not be considered.And for dual-stream beamforming, either three stream wave beam formings or the wave beam forming of more beams figuration fluxion, because there is multiplex data stream, therefore can produce interference between data flow, then need to take into account the weighting processing vector of receiving terminal.Receipt signal model based on foundation, the reception signal of user side can be expressed as product of the weighting processing vector of receiving terminal with receiving signal.
In order that step 203, namely method shown in Fig. 3 is more clear understandable, individually below by single current beamf ormed channels calculation of capacity process, dual-stream beamforming channel capacity calculating process, three stream beamf ormed channels calculation of capacity processes and four stream beamf ormed channels calculation of capacity processes exemplified by, the method to the present embodiment is described in detail.
Wherein, the receipt signal model based on foundation, single current beamf ormed channels calculation of capacity process is as follows：If transmission signal c=forming vectors=νι, then equivalent channel matrix be：
H = HF：！！^ ^ 、 .
Wherein, ^ is left singular matrix first row, is maximum singular value, make ＆=CTl l, then have：
y = HFx + n = + n。
The signal SINR received is：
Therefore, single current beamf ormed channels capacity is：
C = log2(l+S Fiber）.
Wherein, the receipt signal model based on foundation, dual-stream beamforming channel capacity calculating process is as follows：If sending signal c=forming vectors=[^ ,], then equivalent channel matrix is：
H = HF = U∑VHF = a2u2 ] o
Wherein, it is maximum singular value, σ2It is second largest singular value, is left singular matrix first row, 12It is left singular matrix secondary series.
Make [σ ^ σ2η2 ] = ^ g2],
Shellfish ' J： y = HFx + n = + g2x2 + n。
In the present embodiment, eliminate inter-stream interference using MMSE detection algorithms, for data flow ^ and, the filtration combined weighted processing vectors of MMSE of receiving terminal are respectively： Corpse
io2 = (g& H+g2g2 H+^iylThen MMSE receptions signal is respectively g:
¾ = = ro1 1jc1 + ω1 (g2x2+ n)；
Useful signal interference signal and noise
x2 = co2y = (o2g2x2 + ω2 (gt + n)。
Useful signal interference signal and noise
For first =log2(l+S Fiber.
For second data flow, the SINR of reception is：
S Occupational
The channel ergodic capacity of second data flow is：
C2 =log2(l+Surface2)。
So, overall system capacity is during dual-stream beamforming：
C = C1 + C2 =log2[(l + SINR, )(1 + SINR2 )]。
Wherein, the receipt signal model based on foundation, three stream beamf ormed channels calculation of capacity processes are as follows：If transmission signal x=[^ ,], forming vectors=[, ^, ^], then equivalent channel matrix is： ίί = HF = U∑VHF = [σ^ σ2υ2 σ3ιι3]。
Wherein, it is maximum singular value, σ2It is second largest singular value, σ3It is the third-largest singular value, ^ is left singular matrix first row,《2It is left singular matrix secondary series,《3It is the row of left singular matrix the 3rd.
Make [i^ cr2u2 cr3u3] = [g1 g2 g3], then have：
y = HFx + n = g1Jc1 +g2¾ +g3¾ +n。
For data flow, x2The filtration combined weighted processing vectors of MMSE with, receiving terminal are respectively：
ω1 =(§1§1 ίί +§2§2 ίί +§3§3ίί+¾)-1 §1; ω2 =(g1 H +g2g2 H +g3g3 H +^iylg2； ω3=^+^ +^ + Ι)-〖g3So MMSE reception signals are respectively:
Χι =(»1y = oi1glxl+oi1(g2x2 +g3x3+n)；
Useful signal interference signal and noise
x2 =to2y = ro2 2jc2 + ro2( 1jc1 +g3¾ +n)；
Useful signal interference signal and noise
¾ = to3y = co3g3 + ω3 (giXi + 2¾ + n)。
Useful signal interference signal and noise
For first
It can similarly obtain, the SINR of second data flow and the 3rd data stream reception is respectively：
SINR2 = g2 H (glgl H +g3g3 H +^iylg2;Difficult3=§3+^ + 1) .So ergodic channels capacity is during the wave beam forming of three data flows of progress：
C = C1+C2 + C3 =log2 [(1 + SINR, )(1 + SINR2 )(1 + SINR3 )]。
By that analogy, the receipt signal model based on foundation, ergodic channels hold during the wave beam forming of four data flows of progress
C = Cy+C2 + C3+C = log2 [(1 + SINR, )(1 + SINR2 )(1 + SINR3 )(1 + SINR4 )]
Its towel:
SINR, gl (g2§2 + g3g3 + g4g4 )- p
AN SINR 2 — §2 + g3g3 + g4g4 p
AN SINR g3" (gig + g2g2 + g4g4 p g3;
AN SINRA §4 + g2g2" +g3g3 g4。
[gi"- g4]-[o-1u1--- c4u4]。
The method described by above example, you can obtain the corresponding letters of wave beam forming fluxion different in step 102 Number carries out down beam shaping.
Where it is assumed that determining that the maximum corresponding wave beam forming fluxion of channel capacity is n, then n stream wave beam formings are carried out to downlink, figuration formula can be：.
Wherein, (0 representative antennas port p transmission signal, v is n-th of right singular vector to ^^, is the data after wave beam forming.
The embodiments of the invention provide a kind of adaptive multi-flow beam forming method applied in TDD LTE-Advanced systems, this method is used as decision mechanism using channel capacity, consider channel condition, adaptively selected wave beam forming fluxion, the flexibility of system is added, and then improves the overall performance of TDD LTE-Advanced systems.
The embodiment of the present invention additionally provides a kind of base station, as described in the following examples 2.Due to the base station solve problem principle it is similar to the method for above-described embodiment 1, therefore the base station implementations may refer to embodiment 1 method implementation, repeatedly in place of repeat no more.
Embodiment 2
Fig. 4 is a kind of composition schematic diagram of base station provided in an embodiment of the present invention.As shown in figure 4, the base station includes：Determining unit 41, its information for being used to be sent according to user terminal determines the channel matrix of downlink；Computing unit 42, its channel matrix determined according to the determining unit 41 calculates the different corresponding channel capacities of wave beam forming fluxion；
Selecting unit 43, it carries out down beam shaping according to result of calculation of the computing unit 42 to channel capacity, the maximum corresponding wave beam forming fluxion of selection channel capacity.
In one embodiment, the base station also includes：
Notification unit 44, it is used to the selected wave beam forming fluxion of the selecting unit 43 notifying that to the user in one embodiment, computing unit 42 includes：
Determining module 421, it is used for the wave beam forming fluxion for determining to need to calculate channel capacity；
Decomposing module 422, it is used to decompose using the channel matrix that singular value decomposition SVD decomposition methods determine the determining unit 41, regard the column vector of the right singular matrix after decomposition as wave beam forming weight vectors；
Computing module 423, it is used to decompose the wave beam forming weight vectors obtained according to the decomposing module 422, and the weighting of receiving terminal handles vector, calculates the channel for each wave beam forming fluxion that correspondence determining module 421 is determined In one embodiment, determining module 421 includes：
Comparison sub-module 4211, it is used to the antenna number of the antenna number of base station side and user side being compared;Determination sub-module 4212, it is used for the comparative result according to the comparison sub-module 4211, using the smaller in the number as the maximum wave beam forming fluxion of calculating channel capacity is needed, it is determined that it is single current to the maximum wave beam forming fluxion to need to calculate the wave beam forming fluxion of channel capacity.
In one embodiment, decomposing module 422 is decomposed specifically for the channel matrix determined according to below equation to the determining unit：
H = U∑VH。
Wherein, H is channel matrix, and U is left singular matrix, and V is right singular matrix, and ∑ is diagonal matrix.
In one embodiment, computing module 423 specifically for：According to the corresponding wave beam forming weight vectors of current beam figuration fluxion, the corresponding equivalent channel matrix of current beam figuration fluxion is determined；According to the equivalent channel matrix, the weighting processing vector of the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion is calculated；The Signal to Interference plus Noise Ratio SINR of each circuit-switched data stream of current beam figuration fluxion is corresponded to according to the signal-to-noise ratio computation of the weighting of the equivalent channel matrix and receiving terminal processing vector, and receiving terminal;According to the SINR of each circuit-switched data stream of the correspondence current beam figuration fluxion, the channel capacity of the channel of correspondence each circuit-switched data stream is calculated；According to the channel capacity of the channel of correspondence each circuit-switched data stream, the total channel capacity for obtaining the correspondence current beam figuration fluxion is calculated.
Wherein, weighting of the computing module 423 specifically for calculating the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion according to below equation handles vector：
The H of ω bis-H (H H Η,.Wherein, 11 be the equivalent channel matrix of wave beam forming, N.It is noise power, is to send signal power, I=F " F are unit matrixs.
The embodiments of the invention provide a kind of base station applied in TDD LTE-Advanced systems, the base station uses adaptive multi-flow beam forming method, decision mechanism is used as using channel capacity, consider channel condition, adaptively selected wave beam forming fluxion, the flexibility of system is added, and then improves the overall performance of TDD LTE-Advanced systems.
The embodiment of the present invention additionally provides a kind of computer-readable program, wherein when performing the program in a base station, the program causes computer to perform the adaptive multi-flow beam forming method described in embodiment 1 in the base station.
The embodiment of the present invention additionally provides a kind of storage medium for the computer-readable program that is stored with, and wherein the computer can Reader causes computer to perform the adaptive multi-flow beam forming method described in embodiment 1 in a base station.
Apparatus and method more than of the invention can be realized by hardware, can also be realized by combination of hardware software.The present invention relates to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize devices described above or component parts, or the logical block is realized various methods or step described above.Logical block is such as the processor used in field programmable logic part, microprocessor, computer.The invention further relates to the storage medium for storing procedure above, such as hard disk, disk, CD, DVD, flash memory.
Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that these descriptions are all exemplary, it is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit and principles of the present invention, and these variants and modifications are also within the scope of the invention.

Claims (1)

  1. Claims
    1st, a kind of adaptive multi-flow beam forming method, wherein, methods described includes：
    The information that base station is sent according to user terminal determines the channel matrix of downlink；
    Base station calculates the different corresponding channel capacities of wave beam forming fluxion according to the channel matrix；
    Base station is according to the result of calculation of channel capacity, the maximum corresponding wave beam forming fluxion progress down beam shaping of selection channel capacity.
    2nd, the method according to claim 1, wherein, the maximum corresponding wave beam forming fluxion of selection channel capacity is carried out after down beam shaping, and methods described also includes：
    Base station notifies selected wave beam forming fluxion to the user terminal.
    3rd, the method according to claim 1, wherein, base station calculates the corresponding channel capacity of different beams figuration fluxion according to the channel matrix, including：
    Base station determines the wave beam forming fluxion for needing to calculate channel capacity；
    Base station is decomposed using singular value decomposition SVD decomposition methods to the channel matrix, regard the column vector of the right singular matrix after decomposition as wave beam forming weight vectors；
    Base station handles vector according to the weighting of the wave beam forming weight vectors and receiving terminal, calculates to the channel capacity for each the wave beam forming fluxion that should determine that.
    4th, method according to claim 3, wherein, base station determines the wave beam forming fluxion for needing to calculate channel capacity, including：
    Base station using the smaller in the antenna number of the antenna number of base station side and user side as need calculate channel capacity maximum wave beam forming fluxion；
    It is determined that it is single current to the maximum wave beam forming fluxion to need to calculate the wave beam forming fluxion of channel capacity.
    5th, method according to claim 3, wherein, base station is decomposed using singular value decomposition SVD decomposition methods to the channel matrix, is decomposed according to below equation：
    H = U∑VH
    Wherein, H is the channel matrix, and U is left singular matrix, and V is right singular matrix, and ∑ is diagonal matrix.
    6th, method according to claim 3, wherein, base station handles vector according to the weighting of the wave beam forming weight vectors and receiving terminal, calculates to the channel capacity for each the wave beam forming fluxion that should determine that, including：Base station determines the corresponding equivalent channel matrix of current beam figuration fluxion according to the corresponding wave beam forming weight vectors of current beam figuration fluxion； Base station calculates the weighting processing vector of the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion according to the equivalent channel matrix；
    Base station calculates the Signal to Interference plus Noise Ratio SINR of each circuit-switched data stream of correspondence current beam figuration fluxion according to the signal to noise ratio of the weighting of the equivalent channel matrix and receiving terminal processing vector, and receiving terminal;Base station calculates the channel capacity of the channel of correspondence each circuit-switched data stream according to the SINR of each circuit-switched data stream of the correspondence current beam figuration fluxion；
    Base station calculates the total channel capacity for obtaining the correspondence current beam figuration fluxion according to the channel capacity of the channel of correspondence each circuit-switched data stream.
    7th, method according to claim 6, wherein, base station calculates the weighting processing vector of the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion, is calculated according to below equation：
    HH (H H Η +^ΙΤι;Wherein, H is the equivalent channel matrix, N.It is noise power, is to send signal power, I=F " F are unit matrixs.
    8th, a kind of base station, wherein, the base station includes：
    Determining unit, its information for being used to be sent according to user terminal determines the channel matrix of downlink；
    Computing unit, its channel matrix determined according to the determining unit calculates the different corresponding channel capacities of wave beam forming fluxion；
    Selecting unit, it carries out down beam shaping according to result of calculation of the computing unit to channel capacity, the maximum corresponding wave beam forming fluxion of selection channel capacity.
    9th, base station according to claim 8, wherein, the base station also includes：
    Notification unit, it is used to notify the selected wave beam forming fluxion of the selecting unit to the user terminal.
    10th, base station according to claim 8, wherein, the computing unit includes：
    Determining module, it is used for the wave beam forming fluxion for determining to need to calculate channel capacity；
    Decomposing module, it is used to decompose using the channel matrix that singular value decomposition SVD decomposition methods determine the determining unit, regard the column vector of the right singular matrix after decomposition as wave beam forming weight vectors；
    Computing module, it is used to decompose the wave beam forming weight vectors obtained according to the decomposing module, and the weighting of receiving terminal handles vector, calculates the channel capacity for each wave beam forming fluxion that the correspondence determining module is determined.
    11st, base station according to claim 10, wherein, the determining module includes：
    Comparison sub-module, it is used to the antenna number of the antenna number of base station side and user side being compared； Determination sub-module, it is used for the comparative result according to the comparison sub-module, using the smaller in the number as the maximum wave beam forming fluxion of calculating channel capacity is needed, it is determined that it is single current to the maximum wave beam forming fluxion to need to calculate the wave beam forming fluxion of channel capacity.
    12nd, base station according to claim 10, wherein, the decomposing module is decomposed specifically for the channel matrix determined according to below equation to the determining unit：
    H = U∑VH
    Wherein, H is channel matrix, and U is left singular matrix, and V is right singular matrix, and ∑ is diagonal matrix.
    13rd, base station according to claim 10, wherein, the computing module specifically for：
    According to the corresponding wave beam forming weight vectors of current beam figuration fluxion, the corresponding equivalent channel matrix of current beam figuration fluxion is determined；
    According to the equivalent channel matrix, the weighting processing vector of the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion is calculated；
    The Signal to Interference plus Noise Ratio SINR of each circuit-switched data stream of current beam figuration fluxion is corresponded to according to the signal-to-noise ratio computation of the weighting of the equivalent channel matrix and receiving terminal processing vector, and receiving terminal;
    According to the SINR of each circuit-switched data stream of the correspondence current beam figuration fluxion, the channel capacity of the channel of correspondence each circuit-switched data stream is calculated；
    According to the channel capacity of the channel of correspondence each circuit-switched data stream, the total channel capacity for obtaining the correspondence current beam figuration fluxion is calculated.
    14th, base station according to claim 13, wherein, weighting of the computing module specifically for calculating the receiving terminal of each circuit-switched data stream of correspondence current beam figuration fluxion according to below equation handles vector：
    HH (H H Η +^ΙΤι;Wherein, it is the equivalent channel matrix, N.It is noise power, is to send signal power, I=F " F are unit matrixs.
    15th, a kind of computer-readable program, wherein when performing the program in a base station, the program causes computer to perform the adaptive multi-flow beam forming method as described in any one claim in claim 1 to 7 in the base station.
    16th, a kind of storage medium for the computer-readable program that is stored with, the wherein computer-readable program cause computer in a base station perform claim requirement 1 to 7 in any one claim described in adaptive multi-flow beam forming method.
CN2011800613221A 2011-05-25 2011-05-25 Self-adaptive multiple streams beamforming method and base station Pending CN103270704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/074625 WO2012159266A1 (en) 2011-05-25 2011-05-25 Self-adaptive multiple streams beamforming method and base station

Publications (1)

Publication Number Publication Date
CN103270704A true CN103270704A (en) 2013-08-28

Family

ID=47216524

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011800613221A Pending CN103270704A (en) 2011-05-25 2011-05-25 Self-adaptive multiple streams beamforming method and base station

Country Status (2)

Country Link
CN (1) CN103270704A (en)
WO (1) WO2012159266A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115065386A (en) * 2022-06-10 2022-09-16 杭州红岭通信息科技有限公司 Beamforming optimization method and device based on ZF and SVD hybrid precoding
CN115102591A (en) * 2022-08-25 2022-09-23 北京智芯微电子科技有限公司 Beam forming method, device and equipment based on water back injection and readable storage medium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110649948B (en) * 2018-06-26 2021-01-29 上海华为技术有限公司 Signal processing method, baseband unit and radio remote unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101053177A (en) * 2004-11-02 2007-10-10 松下电器产业株式会社 Mobile station device, and method of selecting communication partner
CN101521531A (en) * 2009-04-02 2009-09-02 重庆航天火箭电子技术有限公司 Method of enhancing down-link performance of TD-LTE by antenna selection
CN101854186A (en) * 2009-03-30 2010-10-06 三星电子株式会社 Pre-coding/pre-decoding method and system used for data transmission
US20110013563A1 (en) * 2008-02-28 2011-01-20 Kathiravetpillai Sivanesan Communicating a feedback data structure containing information identifying coding to be applied on wirelessly communicated signaling

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1917497B (en) * 2006-09-08 2010-05-12 清华大学 Self-adaptive method for carrying out multiple input/output OFDM link through capacity
US8135092B2 (en) * 2008-01-31 2012-03-13 Nokia Corporation MIMO-OFDM wireless communication system
CN101754347B (en) * 2008-12-19 2012-07-25 电信科学技术研究院 CQI estimation method, system and device during multi-stream beamforming transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101053177A (en) * 2004-11-02 2007-10-10 松下电器产业株式会社 Mobile station device, and method of selecting communication partner
US20110013563A1 (en) * 2008-02-28 2011-01-20 Kathiravetpillai Sivanesan Communicating a feedback data structure containing information identifying coding to be applied on wirelessly communicated signaling
CN101854186A (en) * 2009-03-30 2010-10-06 三星电子株式会社 Pre-coding/pre-decoding method and system used for data transmission
CN101521531A (en) * 2009-04-02 2009-09-02 重庆航天火箭电子技术有限公司 Method of enhancing down-link performance of TD-LTE by antenna selection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115065386A (en) * 2022-06-10 2022-09-16 杭州红岭通信息科技有限公司 Beamforming optimization method and device based on ZF and SVD hybrid precoding
CN115065386B (en) * 2022-06-10 2023-11-17 杭州红岭通信息科技有限公司 Beam forming optimization method and device based on ZF and SVD mixed precoding
CN115102591A (en) * 2022-08-25 2022-09-23 北京智芯微电子科技有限公司 Beam forming method, device and equipment based on water back injection and readable storage medium

Also Published As

Publication number Publication date
WO2012159266A1 (en) 2012-11-29

Similar Documents

Publication Publication Date Title
CN106209195B (en) Channel state information acquisition method, channel state information feedback method and device
US9473223B2 (en) Methods for optimal collaborative MIMO-SDMA
JP5406987B2 (en) Tomlinson-Harashima precoding with additional receiver processing in multi-user multi-input multi-output wireless transmission systems
KR100541285B1 (en) Signal Processing Method of Multi Input, Multi Output Mobile Communication System
CN102725967B (en) For the method and apparatus of information feed back and precoding
KR101381130B1 (en) Multi-user precoding and scheduling method and base station for implementing the method
TWI285481B (en) Interpolation in channel state feedback
JP5738581B2 (en) Multi-user MIMO transmission method and base station in wireless communication system
EP2380300B1 (en) Methods and arrangements for feeding back channel state information
CN101159466B (en) Self-adaptive accidental wavebeam forming transmission method
WO2010000568A1 (en) Method of reducing intra-cell spatial interference in a mobile cellular network
CN101369871A (en) Multi-user MIMO system precoding method and apparatus based on limited feedback
EP2795807B1 (en) Downlink transmission in a mu-mimo system
EP3907918A1 (en) Parameter configuration method and communication apparatus
CN102474324B (en) Method and device for generating pre-coding matrix codebook
CN104969496A (en) Method and device for determining precoding matrix indicator, user equipment, and base station
EP2525506A1 (en) Method and device for feeding back spatial channel state
KR101422028B1 (en) Codebook For Channel Adaptation and Precoding Method Using The Same
CN105337701B (en) A kind of chain circuit self-adaptive method and device for descending multi-user mimo system
US9479237B2 (en) Vector selection modulation-based multi-antenna transmission method, receiving method and device
WO2009075456A1 (en) Method for transmission interference cancellation for mu-mimo
CN102158270A (en) Sub-channel selecting and pre-code sending method of multi-user MIMO (Multiple Input Multiple Output) system
CN103270704A (en) Self-adaptive multiple streams beamforming method and base station
KR102373485B1 (en) Apparatus and method for channel feedback in wireless communication system
US20230412430A1 (en) Inforamtion reporting method and apparatus, first device, and second device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20130828