CN104883236B - A kind of multi-input multi-output system and its transmission method and user equipment - Google Patents
A kind of multi-input multi-output system and its transmission method and user equipment Download PDFInfo
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- CN104883236B CN104883236B CN201410073464.5A CN201410073464A CN104883236B CN 104883236 B CN104883236 B CN 104883236B CN 201410073464 A CN201410073464 A CN 201410073464A CN 104883236 B CN104883236 B CN 104883236B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- 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
- H04B7/0619—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 using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
Abstract
The invention discloses a kind of transmission methods of multi-input multi-output system, applied to multi-input multi-output system, the system comprises user equipment (UE)s and base station, the described method includes: the channel measurement pilot frequency signal for the downlink that the UE is sent according to the base station estimates the channel state information of itself, and codebook information is generated according to the channel state information；The codebook information is issued the base station by uplink by the UE；UE is dispatched according to the codebook information in the base station, and sends data and data demodulation pilot tone to the UE chosen.The present invention also discloses a kind of multi-input multi-output system, base station and user equipmenies.
Description
Technical field
The present invention relates to mobile communication technology, more particularly to it is a kind of for multi-user's multiple-input and multiple-output (MU-MIMO,
Multi-User Multiple Input Multiple Output) multi-input multi-output system (MIMO, Multiple-
Input Multiple-Output) and its transmission method, base station and user equipment.
Background technique
In recent years, the direction of mobile communication technology towards higher rate, higher frequency spectrum utilization rate is developed.Multiple-input and multiple-output
Technology can double up radio channel capacity in the case where not increasing system bandwidth and antenna transmission power, become future
A key technology of wireless communication.But in a wireless communication system, a base station identical running time-frequency resource with it is multiple total
The user equipment (UE, User Equipment) of channel communicates, and certainly exists serious common-channel interference (CCI, Co-channel
Interference), simultaneously as the geographic separation of receiver, cannot share respective channel information, the joint of receiving end
Detection can not use.Therefore, the technology of AF panel transmitting terminal has been put into, transmitting terminal precoding just becomes solution CCI and asks
A kind of effective scheme of topic.Current precoding technique can be divided into linear predictive coding and nonlinear precoding, nonlinear precoding
There is the lower bit error rate and higher capacity compared to linear predictive coding, wherein modular algebra precoding is also known as Tomlinson-
It is a kind of current practical downlink chain that Harrar, which wishes Ma precoding (THP, Tomlinson Harashima Precoding),
The nonlinear precoding scheme on road can obtain good system performance while approach the upper limit of channel capacity.
But the design scheme of this nonlinear precoding is can to obtain perfect channel state information in transmitting terminal
It is derived in the case of (CSI, Channel State Information), unfortunately, in systems in practice, transmitting terminal is not
It may obtain perfection CSI's.If wireless communication system uses time division duplex (TDD, Time Division Duplex) Working mould
Formula, transmitting terminal can be by heterogeneite principles, and the uplink traffic channel information that base station is estimated is as the letter of downlink
Road information, but uplink and downlink are not complete equity, and downstream transmission is under TDD working method
Different transmission times, thus inevitably there is error in the channel state information that obtains by heterogeneite of base station.
If wireless communication system uses frequency division duplex (FDD, Frequency Division Duplex) operating mode, need
The end UE feedback channel information is wanted, and channel resource is limited, the channel information of feedback must be quantified.In the multi-user case,
Since UE cannot cooperate in the case where not knowing other UE channel situations, between UE so quantifying necessary complete independently.
The relevant technologies that UE selection about base station end has are the algorithms based on minimum capacity loss, and this method is with minimum letter
Road quantization error is selection gist；The relevant technologies also be based on Signal to Interference plus Noise Ratio (abbreviation Signal to Interference plus Noise Ratio, i.e.,
SINR, Signal to Interference plus Noise Ratio) estimator proposes to carry out being incremented by choosing using greedy method
It selects, since SINR evaluated error is larger, preferable performance can only be obtained in the SNR ranges of part, while because being related to a large amount of capacity
It calculates and causes complexity higher.Based on SINR estimator although power system capacity but complexity are improved using tree search method
Du Genggao.Under the premise of the same increment method using greediness, some algorithms are using mentioned estimated expression to the user selected
Pool-size is estimated, and can not only avoid a large amount of calculation of capacity according to another simple method of estimation formula when selecting UE, and
And it can reduce complexity.
Vector quantization, scalar quantization, matrix quantization etc. have been used for the CSI for quantifying single user and single data stream.Due to
In the case where identical feedback overhead, vector quantization performance is better than scalar quantization, and vector quantization is tended in technical research at present.
In vector quantization, the index number that UE returns to codebook vectors gives base station (base station, Basic Station), wherein is indicated with B
Length, that is, bit number of codebook vectors index number, then the size of code book is 2B.Random vector quantifies (RVQ, Radom Vector
Quantization) commonly used in the case where multi-user transmission.
For mimo system, by joint receiving antenna by mimo channel be converted into equivalent multiple input single output (MISO,
Multiple Input Single Output) channel.Due to that cannot cooperate between user, quantifying must complete independently.Believing
When making an uproar more lower than (SNR, Signal to Noise Ratio), MIMO channel, which is projected to the direction maximum eigenvector MET, is
Optimal solution.In SNR high, using the merging algorithm QBC of quantization, i.e., selection generate quantization error it is the smallest it is equivalent to
Measure down channel.Trivellato proposes that the greatest hope Signal to Interference plus Noise Ratio for maximizing SINR merges algorithm (MESC, Maximum
Expected Signal Combining) method.This scheme is better than QBC and MET, restrains in low SNR and high SNR
In MET and QBC.The discussion of above-mentioned all schemes assumes that each UE only receives a data flow, if some UE receiving is extra
When one data flow, due to needing the Line independent information of each stream that feedback procedure can be made to become complicated.It is discussed below several existing
There is technology.
The prior art one
MU-MIMO receiver under the conditions of a kind of existing limited uplink feedback, zero is forced to the UE use selected (ZF,
Zero Forcing) wave beam forming, and the most data flows of each UE.The co-design receiver that this method is proposed,
To maximize expectation SINR as principle feedback information；This utilizes the spatial coherence of transmitting antenna and receiving antenna, and uses
The code book of hierarchical tree structure design, therefore be suitable in identical feedback bits and the case where be low speed UE.
The prior art two
It is feasible using traditional modular algebra method for precoding for the MU-MIMO system of UE multiple antennas, but sends out
It penetrates end and needs known entire channel state matrix, each UE needs to feed back the channel information of itself to transmitting terminal, the feedback needed
Measure it is larger, especially in the case where UE channel matrix not full rank, to whole channel matrix informations carry out feedback will cause it is some not
Necessary expense.It needs to improve traditional precoding algorithms at this time, under the premise of guaranteeing that pre-encode operation is gone on smoothly
Effectively reduce the information content for needing to feed back.
Using matrix singular value decomposition (SVD, Singular Value Decomposition), to k-th of UE channel
Matrix OkCarrying out SVD isWherein, subscript H indicates to carry out matrix k-th conjugate transposition, subscript k expression of use
Family, UkFor left characteristic vector, VkFor right characteristic vector SkIt is characterized value.By increasing receiving matrix in receiving end
Wherein ΡKTo receive weight, the right characteristic vector S of UE channel matrix is only fed backkTo transmitting terminal, right characteristic vector S is utilizedkComposition
Unitary matrice carry out QR decomposition, feedback matrix needed for obtaining modular algebra precoding, feedforward matrix and weighting matrix.The method with
The method of direct fed-back channel status matrix is compared, and required feedback quantity substantially reduces, and practicability is higher.
The prior art three
The it is proposed of least mean-square error (MMSE, Minimum Mean Square Error) is for solving when base station attempts
Cause serious CCI when in identical frequency with multiple UE communications, but it is assuming that base station end knows perfect channel information
In the case where, combine effective UE selection algorithm and obtains high-performance.Accurate CSI can not be obtained in reality system, CSI is first
It is broken down into channel direction information CDI and channel quality information CQI, then CDI is based on codebook quantification, and call number is transmitted to base
It stands.Some MMSE precodings, missing and quantization error bring channel uncertainty to CMI have robustness, but do not examine
Consider user's selection.
Problems of the prior art are: (1) under user's multi-stream case, when the end UE is received, generally using
SVD decomposes channel matrix, this complexity for terminal UE is excessively high；(2) multi-user (MU, the Multi- of Limited Feedback
User) system is largely limited to transmitting antenna number greater than receiving antenna number, or receives antenna number equal to fluxion；(3) base station and
The complexity of UE selection is higher；(4) robust MMSE is not bound with user's selection.
Summary of the invention
In view of this, the main purpose of the embodiment of the present invention is to provide a kind of multi-input multi-output system and its transmission side
Method, base station and user equipment can save user terminal and carry out the higher SVD channel matrix decomposition of complexity, and reduce base station end
In the complexity for carrying out user's selection.
In order to achieve the above objectives, the technical solution of the embodiment of the present invention is achieved in that
A kind of transmission method of multi-input multi-output system, which comprises
The channel measurement pilot frequency signal for the downlink that user equipment (UE) is sent according to base station estimates the channel status of itself
Information, and codebook information is generated according to the channel state information；
The codebook information is issued the base station by uplink by the UE；
UE is dispatched according to the codebook information in the base station, and sends data and data demodulation pilot tone to the UE chosen.
Preferably, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is multiuser mimo system MU-MIMO, the UE is by the multi input of estimation
Multi output mimo channel is converted to equivalent multiple input single output MISO channel, and the codebook information of efficient channel is issued described
Base station；
When determining the system is multi-user's MISO system MU-MISO, the UE believes the code book of channel
Breath issues the base station.
Preferably, the UE merges MESC algorithm for the multiple-input and multiple-output MIMO of estimation according to greatest hope Signal to Interference plus Noise Ratio
Channel is converted to equivalent multiple input single output MISO channel.
Preferably, the UE generates codebook information using square inner product MSIP vector quantization VQ criterion offline.
Preferably, the method also includes:
The UE detects the data demodulation pilot tone and data carry out least mean-square error MMSE reception.
A kind of transmission method of multi-input multi-output system, which comprises
The channel measurement pilot frequency signal for the downlink that user equipment (UE) is sent according to base station estimates the channel status of itself
Information, and codebook information is generated according to the channel state information；
The codebook information is issued the base station by uplink by the UE.
A kind of transmission method of multi-input multi-output system, which comprises
UE is dispatched according to the codebook information that UE is sent in the base station, and leads to the UE transmission data and data demodulation chosen
Frequently.
A kind of multi-input multi-output system, the system comprises user equipment (UE)s and base station, in which:
The UE, the channel measurement pilot frequency signal for the UE downlink sent according to the base station estimate itself
Channel state information, and according to the channel state information generate codebook information；And the code book is believed by uplink
Breath issues the base station；
The base station for dispatching UE according to the codebook information, and leads the UE transmission data and data demodulation chosen
Frequently.
A kind of user equipment, the UE include estimation unit and transmission unit, in which:
The channel measurement pilot frequency signal of the estimation unit, the downlink for being sent according to the base station estimates itself
Channel state information, and according to the channel state information generate codebook information；
The transmission unit, for the codebook information to be issued the base station by uplink.
A kind of base station, the base station for dispatching UE according to the codebook information, and send data sum number to the UE chosen
According to demodulation pilot tone.
In the embodiment of the present invention, the channel measurement pilot frequency signal for the downlink that the UE is sent according to the base station is estimated
The channel state information of itself, and codebook information is generated according to the channel state information；The UE passes through uplink for institute
It states codebook information and issues the base station；UE is dispatched according to the codebook information in the base station, and to the UE that chooses send data and
Data demodulation pilot tone so, it is possible to save the user terminal progress higher SVD channel matrix decomposition of complexity, and reduce base station end
In the complexity for carrying out user's selection.
Detailed description of the invention
Fig. 1 is the implementation process schematic diagram of the transmission method of multi-input multi-output system of the embodiment of the present invention；
Fig. 2 is the composed structure schematic diagram of multi-input multi-output system of the embodiment of the present invention；
Fig. 3 is the composed structure schematic diagram of UE of the embodiment of the present invention；
Fig. 4 is MU-MIMO of embodiment of the present invention downlink system block diagram；
Fig. 5 is MU-MIMO of embodiment of the present invention up-link block diagram.
Specific embodiment
The technical solution of the present invention is further elaborated in the following with reference to the drawings and specific embodiments.
Fig. 1 is the implementation process schematic diagram of the transmission method of multi-input multi-output system of the embodiment of the present invention, such as Fig. 1 institute
Show, be applied to multi-input multi-output system, the system comprises UE and base station, this method comprises:
Step 101, the channel measurement pilot frequency signal for the downlink that the UE is sent according to the base station estimates itself
Channel state information, and codebook information is generated according to the channel state information；
Here, channel state information described in the UE uses square inner product (MSIP, Mean Squared Inner
Product) vector quantization (VQ, Vector Quantization) criterion generates codebook information offline.
Step 102, the codebook information is issued the base station by uplink by the UE；
Here, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is multiuser mimo system MU-MIMO, the UE is by the multi input of estimation
Multi output mimo channel is converted to equivalent multiple input single output MISO channel, and the codebook information of efficient channel is issued described
Base station；
When determining the system is multi-user's MISO system MU-MISO, the UE believes the code book of channel
Breath issues the base station.
Here, the user equipment merges MESC algorithm for the multiple-input and multiple-output of estimation according to greatest hope Signal to Interference plus Noise Ratio
Mimo channel is converted to equivalent multiple input single output MISO channel.
Step 103, UE is dispatched according to the codebook information in the base station, and sends data and data demodulation to the UE chosen
Pilot tone.
In the embodiment of the present invention, the method also includes: the UE detects the data demodulation pilot tone and data carry out
MMSE is received.
The embodiment of the present invention also provides a kind of transmission method of multi-input multi-output system, is applied to multiple-input and multiple-output system
System, the system comprises user equipment (UE)s and base station, this method comprises:
Step A1, the UE estimate that the channel status of itself is believed according to the downlink pilot signal that the base station is sent
Breath, and codebook information is generated according to the channel state information；
Here, channel state information described in the UE generates code book using square inner product MSIP vector quantization VQ criterion offline
Information.
The codebook information is issued the base station by uplink by step A2, the UE.
Here, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is MU-MIMO, the multiple-input and multiple-output MIMO channel of estimation is converted to by the UE
The multiple input single output MISO channel of effect, and the codebook information of efficient channel is issued into the base station；
When determining the system is MU-MISO, the codebook information of channel is issued the base station by the UE.
Here, the UE merges MESC algorithm according to greatest hope Signal to Interference plus Noise Ratio and believes the multiple-input and multiple-output MIMO of estimation
Road is converted to equivalent multiple input single output MISO channel.
In the embodiment of the present invention, the method also includes: the UE detects the data demodulation pilot tone and data carry out
MMSE is received.
A kind of transmission method of multi-input multi-output system provided in an embodiment of the present invention is applied to multiple-input and multiple-output system
System, the system comprises UE and base station, this method comprises:
UE is dispatched according to the codebook information that UE is sent in step B, the base station, sends data and data demodulation to the UE chosen
Pilot tone.
A kind of multi-input multi-output system provided in an embodiment of the present invention, Fig. 2 are multiple-input and multiple-output of the embodiment of the present invention
The composed structure schematic diagram of system, as shown in Fig. 2, the system includes UE 21 and base station 22, in which:
The UE 21 estimates certainly for the UE according to the downlink channel measurement pilot signals that the base station is sent
The channel state information of body, and codebook information is generated according to the channel state information；And pass through uplink for the code book
Information issues the base station；
The base station 22 for dispatching UE according to the codebook information, and sends data and data demodulation to the UE chosen
Pilot tone.
Here, channel state information described in the UE generates code book using square inner product MSIP vector quantization VQ criterion offline
Information.
Here, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is MU-MIMO, the multiple-input and multiple-output MIMO channel of estimation is converted to by the UE
The multiple input single output MISO channel of effect, and the codebook information of efficient channel is issued into the base station；
When determining the system is MU-MISO, the codebook information of channel is issued the base station by the UE.
Here, the UE merges MESC algorithm according to greatest hope Signal to Interference plus Noise Ratio and believes the multiple-input and multiple-output MIMO of estimation
Road is converted to equivalent multiple input single output MISO channel.
Here, the UE, is also used to detect the data demodulation pilot tone and data carry out least mean-square error MMSE and connect
It receives.
A kind of user equipment provided in an embodiment of the present invention, Fig. 3 are the composed structure schematic diagram of UE of the embodiment of the present invention, such as
Shown in Fig. 3, the UE includes estimation unit 31 and transmission unit 32, in which:
The estimation unit 31, the channel measurement pilot frequency signal estimation of the downlink for being sent according to the base station is certainly
The channel state information of body, and codebook information is generated according to the channel state information；
The transmission unit 32, for the codebook information to be issued the base station by uplink.
Here, the UE further includes receiving unit 33, carries out minimum for detecting the data demodulation pilot tone and data
Square error MMSE is received.
A kind of base station provided in an embodiment of the present invention, the base station, for dispatching UE according to the codebook information, to choosing
UE send data and data demodulation pilot tone.
The transmission method of multi-input multi-output system provided in an embodiment of the present invention is applied to MU-MIMO system, the system
It receives and designs using two steps, including MESC receiver and MMSE receiver, wherein MESC receiver is served only for quantifying, often
A UE maximizes the quantization codebook vectors of the SINR of data flow using the selection of MESC receiver；MMSE receiver is for receiving number
According to because the data processing performance of MMSE receiver is better than for mutually mutually non-orthogonal reporting channel and limited UE
MESC receiver.It is assumed that UE according to itself data flow and can estimate effective channel.
Embodiment one
The transmission method of multi-input multi-output system provided in an embodiment of the present invention, in case where MU-MIMO multithread,
This approach includes the following steps, and the UE estimates the channel status of itself according to the downlink pilot signal that the base station is sent
Information, and MU-MIMO is converted into equivalent MU-MISO；Here, which it is higher can to save the end UE progress complexity
SVD channel matrix decomposition.
As shown in figure 4, k-th of UE is to be added to a N in receiving endk×LkDecoding matrix Vk, V=diag (V1,...,
VK) it is whole decoding matrix.At this point, the signal that UE termination receives can be expressed as: Wherein, x is input signal x=[x1,
x2,…,xk,…,xL], wherein L indicates to have L UE altogether；Indicate the estimation signal of k-th of UE；Indicate the estimation of the 1st UE
Signal；n1Indicate the noise signal of the 1st UE；nkIndicate the noise signal of k-th of UE；P indicates power；U indicates transmitting terminal
Demodulation matrix；Indicate that the reception signal of downlink, subscript DL indicate downlink, accordingly, subscript UL indicates uplink
Road,；Indicate the reception weight matrix of k-th of user；O1For the 1st UE channel matrix；OkFor k-th of UE channel matrix.
As shown in figure 5, x1Indicate the input signal of the 1st UE, xkIndicate the input signal of l-th UE, F=HV=
[f1,...,fL], f1Indicate the logic channel of the 1st UE, xkIndicate that the logic channel of l-th UE, n indicate noise signal；U1Table
Show the demodulation matrix of the 1st UE；ULIndicate the demodulation matrix of l-th UE；Vector f1,...,fLBe to data flow be equivalent to M ×
1 MISO channel.For the reception signal of downlink, the change of this problem, which is converted into, solves V=diag (V1,...,VK) ask
Topic.
To minimize the total SMSE for receiving the multiple streams of signal as criterion, and combine the confined condition of actual power | | p | |1
≤Pmax,||vi| |=| | ui| |=1, | | indicate norm, PmaxIndicate maximum power, then by the symmetry principle of virtual uplink,
It can solve:Wherein, Q
For launch channel correlation matrix, IMFor unit battle array, σ2For noise power, qiFor the aid in treatment parameter of i-th of UE, specific real
It is related with the gain of antenna etc. during applying, therefore the SMSE of uplink signal can be expressed as:Wherein,What is indicated is i-th
Uplink mean square error (MSE, Mean Square Error) error of UE, L indicate the number of UE,Indicate jamming power；
Due toBe it is fixed, the equation of SMSE expression formula is the function of Q, and solution obtains:And tr [Q]≤Pmax,qk>=0,P=Q；Wherein, opt expression asks optimal, and tr expression carries out matrix to ask mark operation, the end UE
MESC receiver the MISO channel f of equivalent matrix dimension M × 1 of data flow is quantified.
First assume before a quantization the quantized channel of different UE be it is completely orthogonal, i.e.,It is availableSince each UE knows the inner product of different codebook vectors in its code book, so two streams without assuming same UE
Quantized channel be orthogonal.
The SINR of i-th of data flow of downlink are as follows:Wherein,
Due to uiAnd BiStructureIt is viWithEquation,In code bookMiddle choosing
It takes.Therefore, decoded vector vjWithIt can be as follows by Combination selection:It is detected, can be solved using MMSEUE makes
It is calculated with above formula each'sAnd select quantized channelMakeIt maximizes.
Finally, base station end carries out UE selection by uplink feedback information；Here uplink feedback information includes channel status letter
Breath；Decomposition of the following theory deduction based on channel matrixWith one
The MMSE pre-coding matrix of kind robustDefinitionThe then sum-MSE of MMSE precoding are as follows:
It enables
All UE be Ω=1,2 ..., Kt,It is the subset for possessing any K UE, ω is the UE collection selected, that is, is met
When there are many quantity of UE, complete search complexity is too high, it is therefore desirable to find a kind of algorithm of low complex degree.
It is the quantized channel of all UE, removes the remaining K of non-selected i-th of UEtThe channel of -1 UE isAnd meetTherefore, remaining Kt- 1UE'sWhereinAre as follows:
At this moment,
Therefore, j-th of UE being not selected meets following formulaIt is removed one by one, remaining K
UE seeks to the UE of selection.
In the present embodiment, algorithm complexity includes three parts: initialization, user's search, matrix update.Wherein initialize
Possess fixed complexity with matrix update, and because each search phase includes that different UE number user search is modified
Complexity.Search time and energy consumption search UE quantity are proportional；The primary weighing apparatus that complexity is defined with the quantity of search UE
The UE of amount standard, such user choosing method selected is total up to K (2K for several timest- K+1)/2, and common user's search time
Number isSignificantly reduce complexity.
Embodiment two
The transmission method of multi-input multi-output system provided in an embodiment of the present invention, in case where MU-MISO multithread；
Equivalent without carrying out channel for the system of MU-MISO multithread, corresponding equivalent matrix is set as unit matrix in base station end.Often
A UE quantifies the channel of itself, and code book index number is issued base station.
To minimize the SMSE for receiving signal as criterion, and the confined condition of combining response | p | |1≤Pmax,||vi| |=|
|ui| |=1；Again by the symmetry principle of virtual uplink, can solve:Therefore the SMSE of uplink signal can
To be expressed as:Due toBe it is fixed,
The equation of SMSE expression formula is the function of Q, and solution obtains:And tr
[Q]≤Pmax,qk>=0,P=Q；Then, the MESC receiver at the end UE is to the equivalent of data flow
Quantified for the MISO channel f of matrix dimension M × 1.
Before a quantization first, it is assumed that the quantized channel of different UE be it is completely orthogonal, i.e.,It is availableSince each UE knows in its code book the inner product of different codebook vectors, so it is not assumed that two of same UE are flowed
Quantized channel is orthogonal.
The SINR of i-th of data flow of downlink:
Wherein,
Due to uiAnd BiStructureIt is viWithEquation,In code book
Middle selection, therefore, decoded vector vjWithIt can be as follows by Combination selection:It is detected, can be solved using MMSE:UE uses above formula meter
It calculates each'sAnd select quantized channelMakeIt maximizes.
Finally, base station end carries out UE selection by uplink feedback information.Decomposition of the following theory deduction based on channel matrixWith a kind of MMSE pre-coding matrix of robust:DefinitionThen
The sum-MSE of MMSE precoding are as follows:
Enable all UE be Ω=1,2 ..., Kt,It is the subset for possessing any K UE, ω is the UE collection selected, i.e., full
Foot
When there are many quantity of UE, complete search complexity is too high, it is therefore desirable to find a kind of algorithm of low complex degree.
It is the quantized channel of all UE, removes the remaining K of non-selected i-th of usertThe channel of -1 UE isAnd it is full
FootTherefore, remaining Kt- 1 UE'sAt this moment,
Therefore, j-th of user being not selected meets following formula:It is removed one by one, remaining K
A UE seeks to the UE of selection.
In the present embodiment, algorithm complexity includes three parts: initialization, user's search, matrix update.Wherein initialize
Possess fixed complexity with matrix update, and because each search phase includes that different number of users user search is modified
Complexity.Search time and energy consumption search number of users are proportional；The measurement of complexity is once defined with search number of users
The user of standard, such user choosing method selected is total up to K (2K for several timest- K+1)/2, and common user's search time
Number isSignificantly reduce complexity.
Embodiment three
The transmission method of multi-input multi-output system provided in an embodiment of the present invention, in case where the mono- stream of MU-MIMO,
This approach includes the following steps, and the UE estimates the channel status of itself according to the downlink pilot signal that the base station is sent
Information；MU-MIMO is converted into equivalent MU-MISO；Here the step of, is similar to embodiment one, therefore repeats no more.
To minimize the SMSE for receiving signal as criterion, and the confined condition of combining response | p | |1≤Pmax, | | v | |=|
| u | |=1；Again by the symmetry principle of virtual uplink, can solve:Therefore the SMSE of uplink signal can be expressed as:Due toBe it is fixed, the equation of SMSE expression formula is the letter of Q
Number.Solution obtains:And tr [Q]≤Pmax, q >=0,
P=Q；Then, the MESC receiver at the end UE quantifies the MISO channel f of equivalent matrix dimension M × 1 of data flow.
Before a quantization first assume: assuming that the quantized channel of different UE be it is completely orthogonal, i.e.,It is availableThe SINR of downlink:Decoded vector can be as follows by Combination selection:It can be solved using MMSE detection: UE is calculated each using above formulaSINRDL, and select quantized channelMake SINRDL
It maximizes.
Finally, base station end carries out UE selection by uplink feedback information.Decomposition of the following theory deduction based on channel matrixWith a kind of MMSE pre-coding matrix of robustWherein defineThen MMSE is pre-
CodingWhereinAre as follows:
It enables all
UE be Ω=1,2 ..., Kt,It is the subset for possessing any K user, ω is the user's collection selected, that is, meets:
When there are many quantity of UE, complete search complexity is too high, therefore finds a kind of algorithm of low complex degree.It is institute
There is the quantized channel of UE, removes the remaining K of non-selected i-th of UEtThe channel of -1 UE isAnd meetTherefore, remaining Kt- 1 UE'sWhereinAre as follows:
At this moment,
, therefore, j-th of UE being not selected meets following formula:It is removed one by one, remaining K
A UE seeks to the UE of selection.
In the present embodiment, algorithm complexity includes three parts: initialization, user's search, matrix update.Wherein initialize
Possess fixed complexity with matrix update, and because each search phase includes that different number of users user search is modified
Complexity.Search time and energy consumption search number of users are proportional；The measurement of complexity is once defined with search number of users
Standard.The user of such user choosing method selected is total up to K (2K for several timest- K+1)/2, and common user's search time
Number isSignificantly reduce complexity.
Example IV
The transmission method of multi-input multi-output system provided in an embodiment of the present invention, in case where MU-MISO multithread；
Equivalent without carrying out channel for the system of MU-MISO multithread, corresponding equivalent matrix is set as unit matrix in base station end.Often
A UE quantifies the channel of itself, and code book index number is issued base station.Due to only one data flow of UE, there is no other streams
Interference；Because being single user, the interference of other UE is also not present.
To minimize the SMSE for receiving signal as criterion, and the confined condition of combining response | p | |1≤Pmax, | | v | |=|
| u | |=1.Again by the symmetry principle of virtual uplink, can solve
Therefore the SMSE of uplink signal can be expressed as:Due toIt is fixed
, the equation of SMSE expression formula is the function of Q.Solution obtains:And tr [Q]≤
Pmax, q >=0,P=Q；Then, the MESC receiver at the end UE to the equivalent M of data flow ×
1MISO channel f is quantified.
Before a quantization first assume: assuming that the quantized channel of different UE be it is completely orthogonal, i.e.,It is availableThe SINR of downlink is SINRDL, thenDecoded vector can be combined
It selects as follows:It is detected, can be solved using MMSEUE is calculated each using above formulaSINRDL, and select
Select quantized channelMake SINRDLIt maximizes.
Finally, base station end carries out user's selection by uplink feedback information.Point of the following theory deduction based on channel matrix
SolutionWith a kind of MMSE pre-coding matrix of robustWherein defineThen MMSE is pre-
The sum-MSE of coding are as follows:
Separately
All UE be Ω=1,2 ..., Kt,It is the subset for possessing any K UE, ω is the UE collection selected, that is, is met
When there are many quantity of UE, complete search complexity is too high, it is therefore desirable to find a kind of algorithm of low complex degree.
It is the quantized channel of all UE, removes the remaining K of non-selected i-th of UEtThe channel of -1 UE isAnd meetTherefore, remaining KtThe sum-MSE of -1 UE are as follows: At this moment,Therefore,
The user j being not selected meets following formulaIt is removed one by one, remaining K UE is exactly
The UE to be selected.
In the embodiment of the present invention, algorithm complexity includes three parts: initialization, user's search, matrix update.Wherein just
Beginningization and matrix update possess fixed complexity, and because each search phase includes that different number of users user search has change
The complexity of change.Search time and energy consumption search number of users are proportional.Once complexity is defined with search number of users
Measurement standard.The user of such user choosing method selected is total up to K (2K for several timest- K+1)/2, and common user searches
Rope number isSignificantly reduce complexity.
If the above-mentioned integrated unit of the present invention is realized in the form of software function module and is sold as independent product
Or it in use, also can store in a computer readable storage medium.Based on this understanding, the embodiment of the present invention
Substantially the part that contributes to existing technology can be embodied in the form of software products technical solution in other words, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute all or part of each embodiment the method for the present invention.And it is preceding
The storage medium stated includes: movable storage device, read-only memory (ROM, Read-Only Memory), magnetic or disk etc.
The various media that can store program code.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (7)
1. a kind of transmission method of multi-input multi-output system, which is characterized in that the described method includes:
The channel measurement pilot frequency signal for the downlink that user equipment (UE) is sent according to base station estimates the channel state information of itself,
And codebook information is generated according to the channel state information；
The codebook information is issued the base station by uplink by the UE；
UE is dispatched according to the codebook information in the base station, and sends data and data demodulation pilot tone to the UE chosen；
Wherein, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is multiuser mimo system MU-MIMO, how defeated the UE is by the multi input of estimation
Mimo channel is converted to equivalent multiple input single output MISO channel out, and the codebook information of efficient channel is issued the base
It stands；
When determining the system is multi-user's MISO system MU-MISO, the UE sends out the codebook information of channel
To the base station.
2. being calculated the method according to claim 1, wherein the UE merges MESC according to greatest hope Signal to Interference plus Noise Ratio
The multiple-input and multiple-output mimo channel of estimation is converted to equivalent multiple input single output MISO channel by method.
3. the method according to claim 1, wherein the UE uses square inner product MSIP vector quantization VQ criterion
It is offline to generate codebook information.
4. method according to any one of claims 1 to 3, which is characterized in that the method also includes:
The UE detects the data demodulation pilot tone and data carry out least mean-square error MMSE reception.
5. a kind of transmission method of multi-input multi-output system, which is characterized in that the described method includes:
The channel measurement pilot frequency signal for the downlink that user equipment (UE) is sent according to base station estimates the channel state information of itself,
And codebook information is generated according to the channel state information；
The codebook information is issued the base station by uplink by the UE；
Wherein, the codebook information is issued the base station by uplink by the UE, comprising:
When determining the system is multiuser mimo system MU-MIMO, how defeated the UE is by the multi input of estimation
Mimo channel is converted to equivalent multiple input single output MISO channel out, and the codebook information of efficient channel is issued the base
It stands；
When determining the system is multi-user's MISO system MU-MISO, the UE sends out the codebook information of channel
To the base station.
6. a kind of multi-input multi-output system, which is characterized in that the system comprises user equipment (UE)s and base station, in which:
The UE, the channel measurement pilot frequency signal for the UE downlink sent according to the base station estimate the letter of itself
Channel state information, and codebook information is generated according to the channel state information；And the codebook information is sent out by uplink
To the base station；
The base station for dispatching UE according to the codebook information, and sends data and data demodulation pilot tone to the UE chosen；
Wherein, the codebook information is issued by the base station by uplink, comprising:
When determining the system is multiuser mimo system MU-MIMO, how defeated the UE is by the multi input of estimation
Mimo channel is converted to equivalent multiple input single output MISO channel out, and the codebook information of efficient channel is issued the base
It stands；
When determining the system is multi-user's MISO system MU-MISO, the UE sends out the codebook information of channel
To the base station.
7. a kind of user equipment, which is characterized in that UE includes estimation unit and transmission unit, in which:
The channel measurement pilot frequency signal of the estimation unit, the downlink for being sent according to base station estimates the channel shape of itself
State information, and codebook information is generated according to the channel state information；
The transmission unit, for the codebook information to be issued the base station by uplink；
Wherein, the codebook information is issued by the base station by uplink, comprising:
When the system that determines is multiuser mimo system MU-MIMO, the UE is by the multiple-input and multiple-output of estimation
Mimo channel is converted to equivalent multiple input single output MISO channel, and the codebook information of efficient channel is issued the base station；
When determining the system is multi-user's MISO system MU-MISO, the UE sends out the codebook information of channel
To the base station.
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