CN102545983B - Processing method and device for pilot frequency in multi-point cooperative transmission system - Google Patents
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Abstract
The invention provides a processing method and a device for pilot frequency in a multi-point cooperative transmission system, in order to solve the problems of occupancy of frequency spectrum resource by fully orthogonal pilot frequency and consumption of system transmission capacity. The method comprises the following steps of: generating a pilot frequency matrix set and picking out a vector of a pilot frequency matrix as the pilot frequency from the pilot frequency matrix set, wherein a row vector in each pilot frequency matrix corresponds to an antenna of a base station; emitting corresponding pilot frequency through the antenna, wherein the pilot frequency emitted between base stations is non-orthogonal; and responding by a mobile terminal according to a pilot frequency estimation channel to detect channel quality. The non-orthogonal pilot frequency is used between the base stations, so that the orthogonality of the pilot frequency between all transmitting antennas in the base station is maintained. By using the non-orthogonal pilot frequency technology, distinguishing of pilot frequency sequences transmitted by different base stations can be realized by using large-size difference of the transmission channels for different cooperative base stations to reach a terminal; and thus, the amount of the system resource integrally occupied by the pilot frequency is reduced, and the consumption of the system resource is reduced.
Description
Technical field
The application relates to the communication technology, particularly relates to a kind of processing method and device of pilot frequency in multi-point cooperative transmission system.
Background technology
Coordinated multipoint transmission (CoMP, Coordinated Multi-Point) technology has been proved to be a kind of mobile communication new technology that effectively suppresses presence of intercell interference, has obtained extensive attention in next generation mobile communication standardized process.Coordinated multipoint transmission technology is especially very effective to improving Cell Edge User hardware circuit solution.
But in multipoint cooperative transmission system, in order to realize the Combined Treatment of multiple communities, especially descending combine transmission, often require receiver can estimate and feed back the channel condition information (CSI, Channel State Information) of the transmitting antenna of the base station of all participation cooperations of base station side.Now need to launch pilot tone by base station and estimate channel response, and then detect channel quality.
For the channel quality that causes interfering with each other in anti-stop signal transmission goes wrong, usual way is to use completely orthogonal pilot tone.But along with participating in the number of base stations (N of cooperation
b) increase, and the increase of the antenna number that configures of each base station, if maintain the complete orthogonal property of the pilot frequency sequence that uses between all transmitting antennas, the needed total number of pilots of multipoint cooperative transmission system can be along with total number of transmit antennas (the N=number of base stations N of downlink end (being base station side)
b× antenna number X that each base station configures) linear growth and increasing.This demand will take very many frequency spectrum resources, the greatly transmission capacity of consumption systems in Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplexing) system.
Summary of the invention
The application provides a kind of processing method and device of pilot frequency in multi-point cooperative transmission system, takies frequency spectrum resource, the problem of consumption systems transmission capacity to solve complete orthogonal guide frequency.
In order to address the above problem, the application discloses a kind of processing method of pilot frequency in multi-point cooperative transmission system, comprising:
Generate pilot matrix set, and the vector of picking out a pilot matrix from pilot matrix set is as pilot tone;
An antenna of the row vector respective base station in each pilot matrix, by pilot tone corresponding to described antenna transmission, the pilot tone of wherein launching between each base station is non-orthogonal;
Mobile terminal is estimated channel response according to described pilot tone, detects channel quality.
Preferably, the set of described generation pilot matrix, comprising:
M set of matrices of random generation, and the feature output of calculating each set of matrices;
Select described M the minimum value in feature output, using the set of matrices at described minimum value place as pilot matrix set.
Preferably, the described vector of picking out a pilot matrix from pilot matrix set, as pilot tone, comprising:
From pilot matrix set, pick out matrix corresponding to described minimum value as pilot matrix, and using from the vector of described pilot matrix as pilot tone.
Preferably, it is characterized in that, M set of matrices of described random generation, and the feature output of calculating each set of matrices, comprising:
S11, generates N at random
bindividual matrix, wherein, line number and the columns of described matrix are L, and vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna;
S12, by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice;
S13, selects respectively the front N/N in each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L;
Repeat S11 to the process of S13 M-1 time, obtain the feature output of M set of matrices, M > 0, M is positive integer.
Preferably, the feature output of the described set of matrices of described calculating, comprising:
Calculate in described set of matrices the norm between each split-matrix as correlation number;
From described correlation number, select the feature output of maximum as described set of matrices.
Preferably, before exporting corresponding pilot tone by the antenna of respective base station, also comprise:
Search the antenna at the corresponding every foundation of the each row vector station of selected pilot matrix.
Preferably, described norm comprises: 1-norm, Infinite Norm and Frobenius norm.
Accordingly, disclosed herein as well is a kind of processing unit of pilot frequency in multi-point cooperative transmission system, comprising:
Generate pilot module, for generating pilot matrix set, and the vector of picking out a matrix from pilot matrix set is as pilot tone;
Transmitting pilot module, for an antenna of the row vector respective base station of each pilot matrix, by pilot tone corresponding to described antenna transmission, the pilot tone of wherein launching between each base station is non-orthogonal;
Estimation module, estimates channel response for mobile terminal according to described pilot tone, detects channel quality.
Preferably, described generation pilot module, comprising:
Generate and calculating sub module, generate M set of matrices for random, and calculate the feature output of each set of matrices;
The first chooser module, for selecting the minimum value of described M feature output, using the set of matrices at described minimum value place as pilot matrix set.
The second chooser module, for picking out matrix corresponding to described minimum value from pilot matrix set as pilot matrix, and using from the vector of described pilot matrix as pilot tone.
Preferably, described generation calculating sub module, comprising:
Generation unit, for the random N that generates
bindividual matrix, wherein, described matrix is that line number and columns are L, vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna;
Resolving cell, for by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice;
Computing unit, for selecting respectively the front N/N of each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L;
Preferably, described computing unit, comprising:
Computation subunit, for calculating norm between each split-matrix of described set of matrices as correlation number;
Chooser unit, for selecting the feature output of maximum as described set of matrices from described correlation number.
Compared with prior art, the application comprises following advantage:
In the application, first generate the pilot matrix set of correlation minimum, and each entry of a matrix element in pilot matrix set is converted to pilot tone, the corresponding base station of each pilot matrix, by pilot tone corresponding to the antenna transmission of described base station, the pilot tone of wherein launching between each base station is non-orthogonal, estimate channel response according to described pilot tone, detect channel quality.The application provides a kind of nonopiate pilot technique, do not ensureing in completely orthogonal situation, the correlation minimum of the pilot tone that makes the antenna output by each base station between each base station, utilize the transmission channel large scale difference of different cooperative base station incoming terminals, realize the differentiation that different base station is sent to pilot frequency sequence.And can reduce number of pilots overall in multipoint cooperative transmission system, reduce the taking of frequency spectrum resource, can reach the completely orthogonal effect of pilot tone between base station, on the basis that does not reduce systematic function, obtain cell boundary users capacity gain.
Brief description of the drawings
Fig. 1 is multipoint cooperative transmission system structure chart described in the embodiment of the present application;
Fig. 2 is the process flow figure of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application;
Fig. 3 is the flow chart that generates pilot tone in the processing method of a kind of pilot frequency in multi-point cooperative transmission system described in the application's preferred embodiment;
Fig. 4 is two multipoint cooperative transmission system structure charts that base station forms described in the embodiment of the present application;
Fig. 5 is the processing unit structure chart of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application;
Fig. 6 generates in the processing unit of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application and the structure chart of calculating sub module.
Embodiment
For the above-mentioned purpose, the feature and advantage that make the application can become apparent more, below in conjunction with the drawings and specific embodiments, the application is described in further detail.
With reference to Fig. 1, provide multipoint cooperative transmission system structure chart described in the embodiment of the present application.
Comprising processor, base station and mobile terminal.
Described processor can be the processor that single-chip microcomputer, FPGA (Field-Programmable Gate Array, i.e. field programmable gate array) or computer etc. have data processing function, and the application does not limit this.
Base station is that public mobile communication base station is a kind of form of radio station, refers in certain area of radio coverage, and by mobile switching center, and the transceiving letter radio station of carrying out information transmission between mobile telephone terminal.
Mobile terminal refers to the computer equipment that can use in movement, for example mobile phone.
In multipoint cooperative transmission system, processor is gone out pilot tone through processing by the transmission antennas transmit of multiple participation cooperative base station, make mobile terminal can receive corresponding pilot tone for estimating the channel response of respective transmissions passage.。
When pilot signal is launched by base station, can adopt time division multiplexing (TDM with data sequence, Time Division Multiplexer), frequency division multiplexing (FDM, Frequency Division Multiplexing) etc. mode multiple connection get up, be used for offering mobile phone and obtain the needed channel condition information of demodulation, comprise amplitude and the phase reference of demodulation.
In multipoint cooperative transmission system, use completely orthogonal pilot tone, take very many frequency spectrum resources, the greatly transmission capacity of consumption systems.
The application proposes a kind of processing method of pilot frequency in multi-point cooperative transmission system, uses nonopiate pilot tone between base station, and maintains in base station the orthogonality of pilot tone between all transmitting antennas.Adopt this kind of nonopiate pilot technique, can utilize the transmission channel large scale difference of different cooperative base station incoming terminals, realize the differentiation that different base station is sent to pilot frequency sequence, thereby reduce the amount that pilot tone totally takies, reduce the consumption of system resource.
With reference to Fig. 2, provide the process flow figure of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application.
Step 11, generate pilot matrix set, and the vector of picking out a matrix from pilot matrix set is as pilot tone;
Concrete steps comprise:
Step 111, generates M set of matrices at random, and calculates the feature output of each pilot matrix set;
Step 112, selects described M the minimum value in feature output, using the set of matrices at described minimum value place as pilot matrix set
Step 113 is picked out matrix corresponding to described minimum value as pilot matrix from pilot matrix set, and using from the vector of described pilot matrix as pilot tone.
In when concrete enforcement, the row vector in pilot matrix can be mapped to corresponding antenna element, send as pilot tone.
First the corresponding base station of each pilot matrix, therefore can search base station corresponding to each matrix in pilot matrix set, then by pilot tone corresponding to the antenna transmission of described base station.
The pilot tone producing in the application is orthogonal between each antenna in base station, but the pilot tone between each base station is non-orthogonal.
Estimate channel response according to described pilot tone, utilize the channel estimating to carry out data monitoring, detect channel quality.
With reference to Fig. 3, provide the flow chart that generates pilot tone in the processing method of a kind of pilot frequency in multi-point cooperative transmission system described in the application's preferred embodiment.
S11, generates N at random
bindividual matrix, wherein, described matrix is that line number and columns are L, vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna;
The matrix of supposing described L × L is K
i(i=1,2 ..., N
b), in described matrix, element is that average is 0, the independent Gauss that mean square deviation is 1 is with distribution CN (0,1), and N/N
bfor the antenna number of each base station in multipoint cooperative transmission system.Described matrix is made up of vector, and therefore each element is wherein a vector.
S12, by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice;
To each Gauss with distribution matrix K
icarry out the left singular vector matrix unitary matrice U that singular value decomposition (SVD, Singular value decomposition) obtains corresponding L × L
1i(or right singular vector matrix unitary matrice U
2i).
N
bindividual Gauss carries out respectively singular value decomposition with distribution matrix, and correspondence can obtain N
bindividual left singular vector matrix unitary matrice U
1i(or right singular vector matrix unitary matrice U
2i).
S13, selects respectively the front N/N in each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L;
From unitary matrice U
1i(or U
1i) in select respectively front N/N
boK, composition
split-matrix
described N
bindividual unitary matrice U
1i(or U
1i) can obtain N
bindividual split-matrix
by described N
bindividual split-matrix
form a set of matrices.
The step of calculating the feature output of described set of matrices comprises:
S131, calculates in described set of matrices the norm between each split-matrix as correlation number;
S132 selects the feature output of maximum as described set of matrices from described correlation number.
Each split-matrix in compute matrix set
between norm
using described norm as cross-correlation coefficient, from described correlation number, select the feature output of maximum as described set of matrices, wherein ‖ ‖
fthe norm of representing matrix.
Wherein, described norm comprises: 1-norm, Infinite Norm and Frobenius norm (being called for short F-norm).
S14, by repeating S11 to the process of S13 M-1 time, obtains the feature output of M set of matrices, M > 0, and M is positive integer.
Repeat the process of S11 to S13, generate new split-matrix
and calculate new split-matrix
characteristic of correspondence output (being maximum cross correlation coefficient), until carry out M time, obtains M feature output.
S15, selects described M the minimum value in feature output, and using set of matrices corresponding described minimum value as pilot matrix set.
Obtain M feature output by above-mentioned steps, from described M feature output, choose minimum value, and using set of matrices corresponding described minimum value as the pilot matrix set of finally choosing, the pilot matrix in described pilot matrix set is split-matrix
In subsequent treatment, each pilot matrix corresponding base station, a split-matrix
corresponding to the base station of i participation cooperation, can be by the element in pilot matrix (i.e. vector) by corresponding N/N
broot transmitting antenna sends.
With reference to Fig. 4, two multipoint cooperative transmission system structure charts that base station forms described in the embodiment of the present application are provided.
Below taking a kind of situation in specifically implementing as example, discuss the method described in the application.
Suppose, N is counted in the base station that participates in cooperation
b=2, multipoint cooperative system is now made up of two base stations.Meanwhile, suppose total number of transmit antennas N=16, terminal reception antenna number is 1, and nonopiate pilot sequence length is L=12.
Step (1): generate at random the matrix K of 2 12 × 12
i(i=1,2), in described matrix, element is that average is 0, the independent Gauss that mean square deviation is 1 is with distribution CN (0,1);
Step (2): to each matrix K
i(i=1,2) are carried out singular value decomposition (SVD) and are obtained corresponding 12 × 12 left singular vector matrix unitary matrice U
1i, to there being 2 left singular vector matrix unitary matrice;
Step (3): from each unitary matrice U
1imiddle to pick out respectively front 16/2=8 capable, the split-matrix of composition 8 × 12
described split-matrix is formed to set of matrices, then calculate the feature output of described set of matrices, i.e. cross-correlation coefficient
in this example, ‖ ‖
fthe Frobenius norm of representing matrix.
Owing to only generating 2 matrix K in this example
i, in homography set, only have 2 split-matrixes
with
the cross-correlation coefficient of described set of matrices only has one, and namely feature output, if the matrix quantity in set of matrices is greater than 2, can calculate multiple cross-correlation coefficients, therefrom select one of maximum to export as feature.
Step (4): repeated execution of steps (1), to step (3), generates new split-matrix
obtain corresponding new set of matrices, and calculate characteristic of correspondence output, i.e. cross-correlation coefficient
until carry out M=10000 time, obtain 10000 feature outputs
Step (5): choose minimum value from above-mentioned 10000 features output, by set of matrices corresponding described minimum value
as the pilot matrix set of finally choosing, the pilot matrix in described pilot matrix set is split-matrix
Follow-up can pilot tone being sent by 16 transmitting antennas altogether of corresponding 2 base stations.
Above-described embodiment is only a kind of method in concrete enforcement, should not be understood as the restriction to the application.
Said process is carried out to emulation by computer, count N in the base station of cooperation
bin=2 situations, the nonopiate pilot tone of N=16, the L=12 generating and sending in method described in the application, its channel estimating performance connects in the complete orthogonal guide frequency transmitting situation of the ectocentral band of position (being less than from base station distance in the region of 0.6 times of radius of society) and N=16, L=16 performance in each community substantially suitable, adopts this nonopiate pilot frequency sequence little on the subscriber channel estimated performance impact of center of housing estate position.
Further N is counted in the base station of contrast cooperation
bin=2 situations, the make a start channel capacity of the Cell Edge User (from base station distance in 0.8～1 times of radius of society region) that adopts high specific transmit mechanism, can find that the application adopts the nonopiate pilot tone of above-mentioned N=16, L=12, than the complete orthogonal guide frequency of available technology adopting N=16, L=16, pilot transmission can obtain higher power system capacity, even with the complete orthogonal guide frequency transmitting situation of prior art N=12, L=12 under power system capacity suitable.
Hence one can see that, adopts the nonopiate pilot schemes of above-mentioned N=16, L=12 can effectively support the associating transmitting antenna number of N=16, instead of only support N=L=12 root transmitting antenna.
In sum, in the application, first generate the pilot matrix set of correlation minimum, and each entry of a matrix element in pilot matrix set is converted to pilot tone, the corresponding base station of each pilot matrix, by pilot tone corresponding to the antenna transmission of described base station, the pilot tone of wherein launching between each base station is non-orthogonal, estimates channel response according to described pilot tone, detects channel quality.The application provides a kind of nonopiate pilot technique, do not ensureing in completely orthogonal situation, the correlation minimum of the pilot tone that makes the antenna output by each base station between each base station, utilize the transmission channel large scale difference of different cooperative base station incoming terminals, realize the differentiation that different base station is sent to pilot frequency sequence.And can reduce number of pilots overall in multipoint cooperative transmission system, reduce the taking of frequency spectrum resource, can reach the completely orthogonal effect of pilot tone between base station, on the basis that does not reduce systematic function, obtain cell boundary users capacity gain.
With reference to Fig. 5, provide the processing unit structure chart of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application.
Accordingly, the application also provides a kind of processing unit of pilot frequency in multi-point cooperative transmission system, comprises and generates pilot module 11, transmitting pilot module 12 and estimation module 13, wherein
Generate pilot module 11, for generating pilot matrix set, and the vector of picking out a matrix from pilot matrix set is as pilot tone;
Transmitting pilot module 12, for an antenna of the row vector respective base station of each pilot matrix, by pilot tone corresponding to described antenna transmission, the pilot tone of wherein launching between each base station is non-orthogonal;
Preferably, described generation pilot module 11, comprising:
Generate and calculating sub module 111, generate M set of matrices for random, and calculate the feature output of each set of matrices;
The first chooser module 112, for selecting the minimum value of described M feature output, using the set of matrices at described minimum value place as pilot matrix set;
The second chooser module 113, for picking out matrix corresponding to described minimum value from pilot matrix set as pilot matrix, and using from the vector of described pilot matrix as pilot tone.
With reference to Fig. 6, provide and in the processing unit of a kind of pilot frequency in multi-point cooperative transmission system described in the embodiment of the present application, generated and the structure chart of calculating sub module.
Preferably, described generation calculating sub module 111, comprising:
Generation unit 1111, for the random N that generates
bindividual matrix, wherein, described matrix is that line number and columns are L, vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna;
Resolving cell 1112, for by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice;
Computing unit 1113, for selecting respectively the front N/N of each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L;
Preferably, described computing unit 1113, comprising:
Computation subunit 11131, for calculating norm between each split-matrix of described set of matrices as correlation number;
Chooser unit 11132, for selecting the feature output of maximum as described set of matrices from described correlation number.
Preferably, described transmitting pilot module 12, also for searching the antenna of the corresponding each base station of each row vector of selected pilot matrix set.
Preferably, described norm comprises: 1-norm, Infinite Norm and Frobenius norm.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
The application can describe in the general context of computer executable instructions, for example program module.Usually, program module comprises and carries out particular task or realize routine, program, object, assembly, data structure of particular abstract data type etc.Also can in distributed computing environment (DCE), put into practice the application, in these distributed computing environment (DCE), be executed the task by the teleprocessing equipment being connected by communication network.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium including memory device.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, commodity or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, commodity or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, commodity or the equipment that comprises described key element and also have other identical element.
The processing method of a kind of pilot frequency in multi-point cooperative transmission system above the application being provided and device, be described in detail, applied principle and the execution mode of specific case to the application herein and set forth, the explanation of above embodiment is just for helping to understand the application's method and core concept thereof; , for one of ordinary skill in the art, according to the application's thought, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application meanwhile.
Claims (4)
1. a processing method for pilot frequency in multi-point cooperative transmission system, is characterized in that, comprising:
Generate pilot matrix set, and the vector of picking out a pilot matrix from pilot matrix set is as pilot tone;
An antenna of the row vector respective base station in each pilot matrix, by pilot tone corresponding to described antenna transmission, the pilot tone of wherein launching between each base station is non-orthogonal;
Mobile terminal is estimated channel response according to described pilot tone, detects channel quality;
The set of wherein said generation pilot matrix, comprising: generate at random M set of matrices, and calculate the feature output of each set of matrices; Select M the minimum value in feature output, using the set of matrices at described minimum value place as pilot matrix set;
The described vector of picking out a pilot matrix from pilot matrix set, as pilot tone, comprising: from pilot matrix set, pick out matrix corresponding to described minimum value as pilot matrix, and using the vector of picking out from described pilot matrix as pilot tone;
M set of matrices of described random generation, and the feature output of calculating each set of matrices, comprising: S11, generates N at random
bindividual matrix, wherein, line number and the columns of described matrix are L, and vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna; S12, by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice; S13, selects respectively the front N/N in each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L; Repeat S11 to the process of S13 M-1 time, obtain the feature output of M set of matrices, M>0, M is positive integer;
The feature output of the described set of matrices of described calculating, comprising: calculate in described set of matrices the norm between each split-matrix as correlation number; From described correlation number, select the feature output of maximum as described set of matrices.
2. method according to claim 1, is characterized in that, before exporting corresponding pilot tone, also comprises by the antenna of respective base station:
Search the antenna at the corresponding every foundation of the each row vector station of selected pilot matrix.
3. method according to claim 1, is characterized in that, described norm comprises: 1-norm, Infinite Norm and Frobenius norm.
4. a processing unit for pilot frequency in multi-point cooperative transmission system, is characterized in that, comprising:
Generate pilot module, for generating pilot matrix set, and the vector of picking out a matrix from pilot matrix set is as pilot tone;
Transmitting pilot module, for an antenna of the row vector respective base station of each pilot matrix, by pilot tone corresponding to described antenna transmission, the pilot tone of wherein launching between each base station is non-orthogonal;
Estimation module, estimates channel response for mobile terminal according to described pilot tone, detects channel quality;
Wherein, described generation pilot module, comprising: generate and calculating sub module, generate M set of matrices for random, and calculate the feature output of each set of matrices; The first chooser module, for selecting the minimum value of M feature output, using the set of matrices at described minimum value place as pilot matrix set;
Described generation pilot module, also comprises: the second chooser module, and for picking out matrix corresponding to described minimum value from pilot matrix set as pilot matrix, and using the vector of picking out from described pilot matrix as pilot tone;
Described generation calculating sub module, comprising: generation unit, and for the random N that generates
bindividual matrix, wherein, described matrix is that line number and columns are L, vectorial for average is 0 in matrix, the independent Gauss that mean square deviation is 1 is with distribution, N/N
b≤ L≤N, N
bfor the number of base station in multipoint cooperative transmission system, N is the sum of multipoint cooperative transmission system antenna; Resolving cell, for by N
bindividual matrix carries out respectively singular value decomposition, obtains corresponding N
bindividual unitary matrice; Computing unit, for selecting respectively the front N/N of each unitary matrice
brow element forms N
bindividual split-matrix, by described N
bindividual split-matrix forms a set of matrices, and calculates the feature output of described set of matrices, and the line number of wherein said split-matrix is N/N
b, columns is L;
Described computing unit, comprising: computation subunit, for calculating norm between each split-matrix of described set of matrices as correlation number; Chooser unit, for selecting the feature output of maximum as described set of matrices from described correlation number.
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| US9166764B2 (en) * | 2012-10-16 | 2015-10-20 | Qualcomm Incorporated | Methods and apparatus for feedback computation and decoding with synchronously coded subcarriers in OFDMA systems |
| EP3217567B1 (en) | 2014-12-08 | 2020-09-30 | Huawei Technologies Co., Ltd. | Method for sending pilot frequency, station and access station |
| CN105790912B (en) * | 2014-12-26 | 2018-10-19 | 上海无线通信研究中心 | The selection of ascending pilot frequency and distribution method in TDD mode m assive MIMO systems |
| CN105790913B (en) * | 2014-12-26 | 2019-01-22 | 上海无线通信研究中心 | The selection and distribution method of ascending pilot frequency in fdd mode massive-MIMO system |
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