CN106330273A - Pre-coding method and device - Google Patents
Pre-coding method and device Download PDFInfo
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- CN106330273A CN106330273A CN201510388477.6A CN201510388477A CN106330273A CN 106330273 A CN106330273 A CN 106330273A CN 201510388477 A CN201510388477 A CN 201510388477A CN 106330273 A CN106330273 A CN 106330273A
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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
- H04B7/0452—Multi-user MIMO systems
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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
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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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Abstract
The invention discloses a pre-coding method and device. The method comprises: an approximate channel h is outputted at a terminal; according to the approximate channel h, each codebook vector in a codebook is evaluated, wherein the codebook is one known by a base station and the terminal; and on the basis of the evaluation result, the codebook vectors are fed back to the base station. The base station side receives the codebook vectors fed back by the terminal, wherein the codebook vectors are obtained by evaluation on the codebook vectors in the codebook based on the approximate channel h; an analog pre-coding matrix is formed based on the codebook vectors; and an equivalent channel is obtained according to the analog pre-coding matrix. Therefore, the terminal can adjust the number of the fed-back codebook vectors dynamically to realize adaption to base stations with different digital channel numbers, so that all digital channel resources can be utilized fully. Moreover, analog and digital pre-coding precision during the analog-digital two-stage pre-coding process can be improved and the channel feedback costs are reduced.
Description
Technical field
The present invention relates to wireless communication technology field, particularly to a kind of method for precoding and device.
Background technology
Realize cost and equipment complexity in order to reduce Massive MIMO technology, and reduce a large amount of receipts
Transmission rate requirements that sender is brought and substantial amounts of CSI-RS (channel state information
Reference signal, channel state information reference signals) resource overhead that brought, someone carries in recent years
Go out to use numerical model analysis precoding technique.
Fig. 1 is numerical model analysis precoding structural representation, as it can be seen, so-called numerical model analysis precoding, is
Refer to the numeric field precoding D at traditional DBF (Digital Beam Forming, digital beam froming)
On the basis of, in the front end near antenna system, in ABF (Analog Beam Forming, analog beam
Formed) radiofrequency signal on increase one-level simulation precoding A.Simulation precoding can be by relatively simple
Mode, makes transmission signal realize the most rough mating with channel.The equivalence letter formed after simulation precoding
The dimension in road is less than actual antenna amount, AD/DA (A:Analog, simulation the most required；
D:Digital, numeral) switching device, digital channel number and corresponding Base-Band Processing complexity can
It is greatly lowered.The interference of simulation precoding portion of residual can carry out single treatment again at numeric field, thus
Ensure the quality that MU-MIMO (MultipleUsers-MIMO, multiuser MIMO) transmits.
For digital precoding, numerical model analysis precoding is a kind of compromise side of performance and complexity
Case, has higher practical prospect in the system that the big bandwidth of high band or antenna amount are the biggest.
In prior art, numerical model analysis precoding at least have the disadvantage that the scheme used in practice
Lower mold near-field precoding accuracy is limited, and as improved precision, then analog domain precoding feedback resource overhead is relatively
Greatly.
Summary of the invention
The invention provides a kind of method for precoding and device, in order in numerical model analysis precoding processing process
In ensure analog-and digital-precoding precision time, reduce channel feedback expense.
The embodiment of the present invention provides method for precoding, including:
Terminal exports approximated channel h；
Being estimated the codebook vectors in code book according to approximated channel h, described code book is base station and terminal institute
The code book known altogether；
According to assessment result to base station feedback codebook vectors.
It is preferred that described approximated channel h is approximated channel h based on Los footpath angle-determining, or, based on
Approximated channel h that the mode that descending code book is measured determines.
It is preferred that being estimated the codebook vectors in code book is to carry out based on SNR criterion or SINR criterion
Assessment.
It is preferred that terminal has maximum SNR value or the codebook vectors of SINR value to base station feedback.
It is preferred that farther include: when to base station feedback codebook vectors, feed back these vector correspondences
SNR value or SINR value.
It is preferred that feed back M codebook vectors when base station feedback codebook vectors, M is digital channel number.
The embodiment of the present invention provides a kind of method for precoding, including:
Receive terminal feedback codebook vectors, described codebook vectors be terminal according to approximated channel h in code book
Codebook vectors be estimated after obtain；
Simulation pre-coding matrix is constituted according to described codebook vectors；
Equivalent channel is obtained according to simulation pre-coding matrix.
Pre-coding matrix is simulated according to the output of described codebook vectors it is preferred that described, including:
After receiving the codebook vectors of terminal feedback, determine that described codebook vectors is by the number of times of terminal feedback；
Front M the codebook vectors selecting number of times most constitutes simulation pre-coding matrix, and M is digital channel number.
It is preferred that farther include: when receiving terminal to base station feedback codebook vectors, receive described code book
The SNR value of vector correspondence or SINR value.
It is preferred that receiving the terminal codebook vectors to base station feedback and SNR corresponding to described codebook vectors
After value or SINR value, the SNR value corresponding according to codebook vectors or SINR value number determine the appearance of codebook vectors
Amount, front M the codebook vectors selecting capacity maximum is simulation pre-coding matrix, and M is digital channel number.
It is preferred that obtain equivalent channel according to simulation pre-coding matrix, including:
Obtain approximated channel h of each terminal, and form approximated channel h；
Equivalent channel is obtained with approximated channel h according to simulation pre-coding matrix.
The embodiment of the present invention provides a kind of pre-coding apparatus, including:
Channel module, for exporting approximated channel h in terminal；
Evaluation module, for the codebook vectors in code book being estimated according to approximated channel h, described code book
It is the base station code book well known with terminal；
Feedback module, is used for according to assessment result to base station feedback codebook vectors.
It is preferred that channel module is further used for based on Los footpath angle-determining approximated channel h, or, based on
The mode that descending code book is measured determines approximated channel h.
It is preferred that evaluation module is further used for based on SNR criterion or SINR criterion the code book in code book
Vector is estimated.
It is preferred that feedback module is further used for having maximum SNR value or SINR value to base station feedback
Codebook vectors.
It is preferred that feedback module is further used for when to base station feedback codebook vectors, feed back described code book to
The SNR value of amount correspondence or SINR value.
It is preferred that feedback module be further used for when to base station feedback codebook vectors feeding back M code book to
Amount, M is digital channel number.
The embodiment of the present invention provides a kind of pre-coding apparatus, including:
Receiver module, for receiving the codebook vectors of terminal feedback, described codebook vectors is that terminal is according to approximation
Channel h obtains after being estimated the codebook vectors in code book；
Simulation precoding matrix module, for constituting simulation pre-coding matrix according to described codebook vectors；
Equivalent channel module, for obtaining equivalent channel according to simulation pre-coding matrix.
It is preferred that simulation precoding matrix module is further used for receiving the codebook vectors of terminal feedback
After, determine that codebook vectors is constituted by the number of times of terminal feedback, front M the codebook vectors selecting number of times most
Simulation pre-coding matrix, M is digital channel number.
It is preferred that receiver module is further used for, when receiving terminal to base station feedback codebook vectors, receiving institute
State SNR value corresponding to codebook vectors or SINR value.
It is preferred that simulation precoding matrix module be further used for receive terminal to the code book of base station feedback to
After amount and SNR value corresponding to described codebook vectors or SINR value, according to the SNR value that codebook vectors is corresponding
Or SINR value number determines the capacity of codebook vectors, front M the codebook vectors selecting capacity maximum is pre-for simulation
Encoder matrix, M is digital channel number.
It is preferred that equivalent channel module is further used for obtaining equivalent channel according to simulation pre-coding matrix
Time, obtain approximated channel h of each terminal, and form approximated channel h；According to simulation pre-coding matrix with
Approximated channel h obtains equivalent channel.
The present invention has the beneficial effect that:
In currently existing scheme, the method that analog domain is searched for based on space angle, the code book to all angles direction
Vector is estimated, the information of terminal feedback assessment.For 3D-MIMO system, the 3D of search
Space is very big, and vertical dimension needs 0-90, level dimension to need 0-180 degree.If in order to realize searching for accurately,
Feedback resources expense and delay that little step-length introduces are the biggest.Such as, 0-180 in the range of level is tieed up
Degree search, if step-length is 1 degree, needs to feed back for 180 times, and the codebook vectors of the most each user can essence
Really to 1 degree.
In the technical scheme that the embodiment of the present invention provides, terminal determine that codebook vectors is pre-as final analog domain
Coding, and it is supplied directly to base station；Base station determines simulation pre-coding matrix accordingly, and obtains equivalent channel.
Owing to same code book is shared in terminal and base station, terminal is carried out for all codebook vectors based on approximated channel h
Assessment.If the code book of terminal comprises 180 codebook vectors, the most just water can be covered with the interval of 1 degree
Flat dimension 0-180 degree.Although approximated channel h assessment code book possibly cannot guarantee that codebook vectors is accurate to 1 degree,
But the terminal code book assessment mode provided by this programme and base station end determine simulation precoding mode, can
Disturb between code book to reduce on the whole, make up the deficiency of degree of accuracy.And after completing all of assessment, only need
Feed back 1 assessment result, that is, disturb minimizing to make degree of accuracy and existing side between this programme is because of code book
In the case of case is roughly the same, with currently existing scheme need feedback repeatedly compared with, considerably reduce feedback and open
Pin and delay.Meanwhile, the technical scheme terminal using the embodiment of the present invention to provide can dynamically adjust feedback mould
Intend codebook vectors number, be so adapted to the digital channel number of different base station end, make full use of different institute
Some digital channel resources.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes of the present invention
Point, the schematic description and description of the present invention is used for explaining the present invention, is not intended that to the present invention not
Work as restriction.In the accompanying drawings:
Fig. 1 is numerical model analysis precoding structural representation in prior art；
Fig. 2 is Limited Feedback modulus framework precoding algorithms implementing procedure schematic diagram in the embodiment of the present invention；
Fig. 3 is the method for precoding implementing procedure schematic diagram of end side in the embodiment of the present invention；
Fig. 4 is base station side method for precoding implementing procedure schematic diagram in the embodiment of the present invention；
Fig. 5 is end side pre-coding apparatus structural representation in the embodiment of the present invention；
Fig. 6 is base station side pre-coding apparatus structural representation in the embodiment of the present invention；
Fig. 7 is terminal structure schematic diagram in the embodiment of the present invention；
Fig. 8 is architecture of base station schematic diagram in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is illustrated.
Inventor note that during invention
In view of MIMO (Multiple Input Multiple Output, multiple-input, multiple-output) technology is for improving peak
Value speed and the important function of system spectrum utilization rate, LTE (Long Term Evolution, Long Term Evolution)
The wireless access technology standards such as/LTE-A (LTE-Advanced, long-term evolution upgrading) be all with
MIMO+OFDM (Orthogonal Frequency Division Multiplexing, OFDM)
Construct based on technology.The performance gain of MIMO technology comes from multiaerial system and can be obtained with
Spatial degrees of freedom, the therefore a MIMO technology most important evolution tendency during Standardization Development
It it is the extension of dimension.
In order to promote MIMO technology further, mobile communication system introduces extensive antenna technology
(Massive MIMO).Academic research shows with preliminary channel measured result, Massive MIMO skill
Art can greatly promote band system band utilization ratio, supports greater amount of access user.The most each greatly
Massive MIMO technology is all considered as in 5G mobile communication system of future generation most potential by research tissue
One of physical-layer techniques.
If Massive MIMO base station system uses tradition PAS (Passive Antenna System, quilt
Dynamic antenna system) antenna structure, in this framework, (each port correspond to independent multiple antenna ports
Radio frequency-intermediate frequency-Baseband Channel) horizontally arranged, and between multiple a period of time of vertical dimension corresponding to each port by
Radio-frequency cable connects.Now, can only tie up by the adjustment to the relative amplitude/phase place between different port in level
Realize each terminal signaling in the optimization of horizontal dimension space characteristic, then can only use unified fan in vertical dimension
District's level precoding.So, will be serious limit systematic vertical dimension space resolution and then constrain and be
The enhancing of system overall performance.So, PAS structure is not appropriate for following Massive mimo system.
If mobile communication system introduces AAS (Active Antenna System, active antenna system)
Technology, then base station antenna system can obtain bigger degree of freedom in vertical dimension, it is possible to real at three dimensions
The now signal optimization to UE (User Equipment, subscriber equipment) level.Can although with AAS technology
To realize maximized spatial resolution and optimum MU-MIMO performance, but this structure needs big
The ad/da converter of amount and the most complete radio frequency-Base-Band Processing passage, either for equipment cost
Or Base-Band Processing complexity will be all huge burden.This problem seems outstanding when high band, big bandwidth
It is prominent.If it addition, compared with PAS structure, under same antenna a period of time number premise, AAS structure
Correspond to more reference signal port.Spatial resolution in view of channel condition information directly depends on this
Port number, if obtaining the channel information of each antenna port, then AAS structure needs more CSI-RS,
Now will consume a large amount of running time-frequency resource.These are all difficult problems for AAS technology application.
Realize cost and equipment complexity in order to reduce Massive MIMO technology, and reduce a large amount of receipts
Transmission rate requirements that sender is brought and substantial amounts of CSI-RS (channel state information
Reference signal, channel state information reference signals) resource overhead that brought, for opening in recent years
Begin the numerical model analysis precoding technique used.For digital precoding, numerical model analysis precoding is
Performance and a kind of half-way house of complexity, have in the system that the big bandwidth of high band or antenna amount are the biggest
Higher practical prospect.In MIMO technology, especially for MU-MIMO technology, network side energy
Enough channel condition information precision obtained will directly determine the precision of precoding/precoding and the effect of dispatching algorithm
Can, thus have influence on overall system performance.Therefore, the acquisition of channel condition information is always MIMO skill
One of problem most crucial in art standardization.
In mixed architecture, the difficult point of channel condition information and precoding is, according to current LTE signal node
Structure, the reference signal of use all assigns into base band, therefore can estimate that obtaining numeral prelists by channel
Channel status needed for Ma.In mixed architecture, due to the process of front end analogue precoding, the equivalence of formation
Digital channel number is less than actual antennas number, and the dimension of the channel matrix obtained by reference signal is the lowest
Dimension in the complete channel matrix that antenna end is experienced.Therefore, digital precode can be obtained with space and divides
Resolution is limited to digital channel number dimension, and compared to complete channel matrix dimension, interference rejection capability is subject to
Arrive certain loss.It addition, for simulation precoding part, its processing procedure is closer to physics sky
Line side, for digital precode, its mimo channel has higher degree of freedom.But,
The reference signal that base band is inserted matching dimensionality owing to having no idea is estimated, because of regardless of whether to FDD
(Frequency Division Duplex, FDD) or TDD (Time Division Duplex,
Time division duplex), its simulation precoding part all cannot directly obtain complete channel condition information.
Based on the above-mentioned analysis for mixed architecture and corresponding difficult point, present stage has had some feasible
Solution.Main thought is: the first step first realizes numeric field precoding, and it is pre-that second step realizes analog domain
Coding.In the first step, analog domain initialize fixing (as above modulus of periodicity intend weights continue to use or
Fixing angle weights etc.), owing to numeric field dimension is relatively low, the reference signal of base band can realize now
Channel estimate accurately, carry out numeric field precoding based on the channel accurately estimated.At second step,
Now numeric field precoding is it has been determined that the weights of analog domain use based on fixing step-length at vertical dimension and water
The method scanned in flat dimension angular range, the result that terminal feedback is searched for each time, finally select optimum
Analog domain precoding vector.
But, this method has the disadvantage that first, and analog domain scans for based on a certain step-length, step
The precision of then analog domain of growing up is limited, and the little then feedback resources of step-length consumes big.Second, numeric field measurement is joined
Examine signal and solution to call the simulation figuration mode that reference signal used and there may be difference.Such as, numeric field
Measurement reference signal be according to initialize fixing weights be simulated figuration (as used certain to fix
Angle of declination), and the solution in final service data is called reference signal and is used through second step simulation figuration
Weights afterwards.This difference can cause the inaccurate of channel quality measurement, thus to multi-subscriber dispatching, money
Source distribution brings impact with the performance of link circuit self-adapting.Additionally, numeric field needs channel to estimate to will also result in one
Fixed resource consumption.
Based on this, the embodiment of the present invention provides the method for precoding of a kind of end side and base station side, under
Face is first illustrated by the enforcement order the most first enforcement to end side of two benches precoding, surveys base station the most again
Enforcement illustrate, then two stage enforcement is carried out overall description.In declarative procedure, respectively from
Terminal illustrates to be not meant to that the two must coordinate enforcement with the enforcement of base station side, it practice, when terminal and base
When station is performed separately, it the most each solves the problem of end side, base station side, when simply the two is used in combination,
Superior technique effect can be obtained.
Separately below the enforcement in terminal, base station side is illustrated, in explanation if no special instructions, all false
If number of users is K, digital channel number is M, and antenna array subnumber is Ntx.
Fig. 2 is the method for precoding implementing procedure schematic diagram of end side, as it can be seen, may include that
Step 201, in terminal export approximated channel h；
Step 202, being estimated the codebook vectors in code book according to approximated channel h, described code book is base
Stand the code book well known with terminal；
Step 203, according to assessment result to base station feedback codebook vectors.
In enforcement, described approximated channel h is approximated channel h based on Los footpath angle-determining, or, based on
Approximated channel h that the mode that descending code book is measured determines.
Approximated channel h described in step 201 obtains mode, is embodied as can be such that
1, directly utilize LOS footpath (nearly LOS footpath) and obtain approximated channel h.
Before system precoding and channel are estimated, between base station and terminal, pass through some reference
Signal, can substantially determine the azimuth information of each terminal, thus can obtain approximating the vertical angle in Los footpath
θkAnd level angle
Utilize existing Los footpath channel model, approximated channel h can be obtained.
Such as, for user k, the approximated channel of definition user k is hk, if it is considered that Saleh-Valebzuela
Channel model, it is known that the Los footpath propagation angle of user kBased on following Los footpath channel architecture
Can be obtained by approximated channel h of user kk:
Here 0≤m≤W, 0≤n≤H, W and H are respectively dimension horizontally and vertically, and Ntx is
Main aerial number, and Ntx=WH.
2, mode based on descending measurement.
One total code book of systemic presupposition, corresponding to one group of codebook vectors.Code book concrete is constituted and wave beam
Numbering is well known by base station and terminal before a communication.
Base station end analog domain to all users one by one (such as time-division, frequency division or other terminal can be made to distinguish
Mode) send the codebook vectors in code book, the y that user k receivesk,iCan be expressed as:
yk,i=hkvi+nk
Here viRepresent i the codebook vectors in ground, select one and hkThe codebook vectors mated most:
Now can be approximately consideredThus obtain approximated channel hk。
In the enforcement of step 202, according to approximated channel h, the codebook vectors in code book is estimated permissible
It is estimated based on SNR criterion or SINR criterion.
In being embodied as, the mode that codebook vectors in code book is estimated by terminal according to channel h can use
Following either a program:
1, code book assessment mode based on SNR criterion (energy criteria).
Base station and all terminals share same code book, and the concrete composition of code book and the numbering of wave beam are logical
Before letter well known by base station and terminal.
For all of code book, in the case of power is identical, calculate each codebook vectors corresponding
SNRk,i=ρ | hkvi|2, ρ represents the normalization factor of noise and power here.
2, code book assessment mode based on SINR criterion.
Base station and all terminals share same code book, and the concrete composition of code book and the numbering of wave beam are logical
Before letter well known by base station and terminal.
For all of code book, in the case of power is identical, calculate each codebook vectors correspondingHere ρ represents the normalization factor of noise and power.
In enforcement, it is also possible to farther include: when to base station feedback codebook vectors, feed back these vectors right
The SNR value answered or SINR value.
In enforcement, feeding back M codebook vectors when base station feedback codebook vectors, M is digital channel number.
In the enforcement of step 203, specifically can be as follows to base station feedback codebook vectors.
The mode of terminal feedback can use any one in below scheme.Equally, it is assumed here that, terminal has
Ntx antenna, has M digital channel, has K user.
The mode of a, only M codebook vectors numbering of feedback.
The mode that each terminal, the mode calculated based on previous step SNR or SINR calculate, selects M
Maximum SNR value or codebook vectors corresponding to SINR value.
Each terminal is to this M codebook vectors numbering of base station feedback.Accordingly, base station, if code book
Middle codebook vectors by user feedback the most then weights+1, otherwise+0.Select in code book, the M of maximum weight
Codebook vectors is as analog domain precoding A.
For example, it is contemplated that K=5 user, Ntx=10 antenna, the framework of M=7 digital channel.Then such as table 1 institute
Show.
Table 1. only feeds back the simulation precoding example of code book vector numbers
| Code book is numbered | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | v9 | v10 |
| User1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 |
| User2 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 |
| User3 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 1 |
| User4 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 |
| User5 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 1 |
| Weights and | 5 | 2 | 4 | 3 | 4 | 3 | 3 | 3 | 4 | 4 |
As shown in table 1, each user only feeds back M the code having maximum S/N R (SINR) value in code book
This vector numbers, if certain vector is fed back, is designated as 1, in the codebook not by feedback marks position 0.So
After weights corresponding for vector each in code book are added, select M has maximum weights and (adds bold Italic
Mark part) vector composition analog domain precoding A.
B, M codebook vectors numbering of feedback, and the mode of corresponding SINR (SNR) value.
The mode that each terminal, the mode calculated based on previous step SNR or SINR calculate, selects M
The codebook vectors that maximum SNR value (or SINR value) is corresponding.
Each terminal is to this M vector numbers of base station feedback, and corresponding SNR (SINR) value.Base
Stand place, utilize SNR (SINR) value of feedback, calculate corresponding capacity, be not 0 by feedback capacity.
Each code book calculate the capacity that can provide of each user and, it may be assumed that
Or
Selecting in code book, M codebook vectors of capacity maximum is as analog domain precoding A.
For example, it is contemplated that K=5 user, Ntx=10 antenna, the framework of M=7 digital channel.Base station is right
In each vector, SNR (SINR) value for K user feedback calculates corresponding capacity, as follows
Shown in table:
Table 2. feedback vector numbering and the simulation precoding example of SNR (SINR) value
| Code book is numbered | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | v9 | v10 |
| User1 | 51 | 67 | 15 | 72 | 0 | 92 | 78 | 0 | 40 | 0 |
| User2 | 15 | 40 | 57 | 5 | 0 | 0 | 1 | 0 | 25 | 36 |
| User3 | 0 | 2 | 65 | 95 | 77 | 60 | 4 | 0 | 0 | 69 |
| User4 | 0 | 26 | 10 | 88 | 0 | 38 | 60 | 2 | 64 | 0 |
| User5 | 16 | 0 | 56 | 0 | 54 | 0 | 11 | 58 | 23 | 20 |
| Capacity and | 82 | 135 | 203 | 260 | 131 | 190 | 154 | 60 | 152 | 125 |
As shown in table 2, each user only feeds back M the vector numbers having maximum S/N R (SINR) value,
And SNR or SINR value.If certain vector is fed back, the capacity marking its correspondence in the codebook is (logical
Cross SNR/SINR to be calculated in above-mentioned formula), it is not 0 by feedback flag.Then by each in code book
The capacity that vector is corresponding is added, and selects M the codebook vectors composition analog domain having heap(ed) capacity sum to prelist
Code A.
Fig. 3 is base station side method for precoding implementing procedure schematic diagram, as it can be seen, may include that
Step 301, the codebook vectors of reception terminal feedback, described codebook vectors is that terminal is according to approximated channel
H obtains after being estimated the codebook vectors in code book；
Step 302, according to described codebook vectors constitute simulation pre-coding matrix；
Step 303, according to simulation pre-coding matrix obtain equivalent channel.
In enforcement, in being embodied as, the mode according to described codebook vectors output simulation pre-coding matrix is permissible
Use any one in below scheme.Equally, it is assumed here that, base station end has Ntx antenna, has M numeral
Passage, has K user.
The mode of a, only M codebook vectors numbering of feedback.
In enforcement, can be after receiving the codebook vectors of terminal feedback, determine that described codebook vectors is by end
The number of times of end feedback；
Front M the codebook vectors selecting number of times most constitutes simulation pre-coding matrix, and M is digital channel number.
Concrete, each terminal, the mode that the mode calculated based on previous step SNR or SINR calculate, choosing
Go out M maximum SNR value or codebook vectors corresponding to SINR value.
Each terminal is to this M codebook vectors numbering of base station feedback.Accordingly, base station, if code book
Middle codebook vectors by user feedback the most then weights+1, otherwise+0.Select in code book, the M of maximum weight
Codebook vectors is as analog domain precoding A.
For example, it is contemplated that K=5 user, Ntx=10 antenna, the framework of M=7 digital channel.Then such as table 3 institute
Show.
Table 3. only feeds back the simulation precoding example of code book vector numbers
| Code book is numbered | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | v9 | v10 |
| User1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 |
| User2 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 |
| User3 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 1 |
| User4 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 |
| User5 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 1 |
| Weights and | 5 | 2 | 4 | 3 | 4 | 3 | 3 | 3 | 4 | 4 |
As shown in table 3, each user only feeds back M the code having maximum S/N R (SINR) value in code book
This vector numbers, if certain vector is fed back, is designated as 1, in the codebook not by feedback marks position 0.So
After weights corresponding for vector each in code book are added, select M has maximum weights and (adds bold Italic
Mark part) vector composition analog domain precoding A.
B, M codebook vectors numbering of feedback, and the mode of corresponding SINR (SNR) value.
In enforcement, receive the terminal codebook vectors to base station feedback and SNR value corresponding to these vectors or
After SINR value, the SNR value corresponding according to codebook vectors or SINR value number determine the appearance that codebook vectors is corresponding
Amount, front M the codebook vectors selecting capacity maximum is simulation pre-coding matrix, and M is digital channel number.
It is what end side was fed back due to what base station side received, is therefore embodied as being referred to as above-mentioned
Terminal lateral base station feedback codebook vectors and these vectorial corresponding SNR value or the enforcement of SINR value.
Concrete, each terminal, the mode that the mode calculated based on previous step SNR or SINR calculate, choosing
Go out M codebook vectors corresponding to maximum SNR value (or SINR value).
Each terminal is to this M vector numbers of base station feedback, and corresponding SNR (SINR) value.Base
Stand place, utilize SNR (SINR) value of feedback, calculate corresponding capacity, be not 0 by feedback capacity.
Each code book calculate the capacity that can provide of each user and, it may be assumed that
Or
Selecting in code book, M codebook vectors of capacity maximum is as analog domain precoding A.
For example, it is contemplated that K=5 user, Ntx=10 antenna, the framework of M=7 digital channel.Base station is right
In each vector, SNR (SINR) value for K user feedback calculates corresponding capacity, as follows
Shown in table:
Table 4. feedback vector numbering and the simulation precoding example of SNR (SINR) value
| Code book is numbered | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | v9 | v10 |
| User1 | 51 | 67 | 15 | 72 | 0 | 92 | 78 | 0 | 40 | 0 |
| User2 | 15 | 40 | 57 | 5 | 0 | 0 | 1 | 0 | 25 | 36 |
| User3 | 0 | 2 | 65 | 95 | 77 | 60 | 4 | 0 | 0 | 69 |
| User4 | 0 | 26 | 10 | 88 | 0 | 38 | 60 | 2 | 64 | 0 |
| User5 | 16 | 0 | 56 | 0 | 54 | 0 | 11 | 58 | 23 | 20 |
| Capacity and | 82 | 135 | 203 | 260 | 131 | 190 | 154 | 60 | 152 | 125 |
As shown in table 4, each user only feeds back M the vector numbers having maximum S/N R (SINR) value,
And SNR or SINR value.If certain vector is fed back, the capacity marking its correspondence in the codebook is (logical
Cross SNR/SINR to be calculated in above-mentioned formula), it is not 0 by feedback flag.Then by each in code book
The capacity that vector is corresponding is added, and selects M the codebook vectors composition analog domain having heap(ed) capacity sum to prelist
Code A.
In the enforcement of step 303, obtain equivalent channel according to simulation pre-coding matrix, may include that
Obtain approximated channel h of each terminal, and form approximated channel h；
Equivalent channel is obtained with approximated channel h according to simulation pre-coding matrix.
In being embodied as, during numeric field precoding processing, it is contemplated that have determined that analog domain prelists
Code A, takes Heq=HA, the equivalent channel model seen for numeric field.Now the process model of numeric field can
To be expressed as: Y=HeqDs+N, D represents numeric field pre-coding matrix here.
Due to the process of analog domain A, the H of high latitude is changed into equivalent channel H of low latitudeseq.So,
The method for precoding of numeric field can directly utilize method for precoding relative complex in tradition here.
Then numeric field is for equivalent channels HeqAcquisition mode, in enforcement can with use following two mode appoint
Meaning one:
A, traditional approach obtain accurate channel.
Can by directly with reference to before in the way of MIMO, e.g., in a tdd system, based on channel reciprocity,
Uplink reference signals is utilized to obtain down channel Heq.In FDD system, base station end transmission pilot tone (or
Code book) form, user detects and feeds back to base station.
B, utilize approximated channel hk。
In implementing such as aforementioned terminals side, be given two kinds determine based on Los footpath angle or based on descending code book measurement
Approximated channel hkAcquisition mode.Base station obtains approximated channel h of each userk, approximated channel H can be formed.
Now base station is it is also known that simulate A, and then just can obtain Heq=HA.
For the mode of numeric field precoding, the now precoding of numeric field, it is also possible to directly utilize traditional
Mode, owing to the dimension of computing is low, it is possible to utilizes the algorithm that some complexities are slightly higher, as ZF algorithm,
MMSE algorithm etc..
In view of the capacity-constrained of inter-user interference in MU-MIMO, and analog domain precoding is eliminating use
The deficiency of interference between family, recommends to use ZF precoding algorithms at numeric field, it may be assumed that
Below the combination embodiment of terminal with base station is illustrated.
Fig. 4 is Limited Feedback modulus framework precoding algorithms implementing procedure schematic diagram, whole during, front four
Individual block diagram (step 401-404) representative simulation territory precoding, last block diagram (step 405) represents
Numeric field precoding.Assuming in explanation that number of users is K, digital channel number is M, and antenna array subnumber is Ntx.
As it can be seen, the technical scheme that the embodiment of the present invention provides is predominantly:
End side:
Step 401, terminal output approximated channel h；
Wherein, obtaining approximated channel h can have two ways, obtains approximated channel h based on Los footpath angle,
Or the mode measured based on descending code book obtains approximated channel h, above-described embodiment illustrates, this
Place repeats no more.
Codebook vectors in code book is estimated by step 402, terminal, exports codebook vectors, and SNR
(Signal-to-Noise Ratio, signal to noise ratio) or SINR (Signal to Interference plus Noise
Ratio, signal and interference and noise ratio) value；
Wherein, the mode of terminal assessment can have two kinds, is estimated based on SNR criterion or SINR criterion,
Having illustrated in above-described embodiment, here is omitted.
Step 403, terminal select M codebook vectors code book to base station feedback from code book；
Wherein, selection mode can have two kinds: selects code book or selection that M maximum SNR value is corresponding
The code book that M maximum SINR value is corresponding；Feedback system can have two kinds: feeds back M codebook vectors numbering
Or feed back M codebook vectors numbering and SNR (SINR) value thereof.Above-described embodiment has been said
Bright, here is omitted.
Share identical code book in end side, base station and terminal, utilize channel to estimate to obtain approximation full latitude letter
Channel state information, codebook vectors all in code book are estimated, then feed back to base station code book by each terminal
Assessment information.
Base station side:
Step 404, base station determine analog domain precoding, output simulation pre-coding matrix A；
Wherein it is determined that analog domain precoding can have two ways: calculate weights and take M code book of maximum
Vector or calculate capacity and take maximum M codebook vectors.Determination herein and aforementioned terminals side step rapid 403
Codebook vectors select relevant, above-described embodiment has illustrated, here is omitted.
Step 405, numeric field precoding；
Wherein: the mode obtaining equivalent channel can have two kinds: obtain accurate channel Heq in a traditional way,
Or utilize two kinds of approximated channel h provided in step 401, obtain further according to A: Heq=HA.Above-mentioned
Having illustrated in embodiment, here is omitted.
Finally equivalent channel Heq just can be utilized to do numeric field wave beam forming, such as ZF etc..Here numeral
Territory method for precoding can directly utilize existing method, repeats no more here.
In base station side, after terminal feedback is to base station code book assessment information, codebook vectors is selected as in base station
Whole analog domain precoding A, analog domain precoding is the most fixing, based on the equivalent channel through simulation precoding,
Numeric field does numeric field precoding.Equivalent channel can utilize baseband reference signal to enter real equivalent channel
Row estimation obtains, or approximated channel h information step 401 be given obtains with simulation precoding Combined Treatment
Arrive.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of pre-coding apparatus, due to these
The principle that device solves problem is similar to method for precoding, and therefore the enforcement of these devices may refer to method
Implement, repeat no more in place of repetition.
Fig. 5 is end side pre-coding apparatus structural representation, as it can be seen, may include that
Channel module 501, for exporting approximated channel h in terminal；
Evaluation module 502, for the codebook vectors in code book being estimated according to approximated channel h, described
Code book is the code book that base station is well known with terminal；
Feedback module 503, is used for according to assessment result to base station feedback codebook vectors.
In enforcement, channel module can also be further used for based on Los footpath angle-determining approximated channel h, or,
The mode measured based on descending code book determines approximated channel h.
In enforcement, evaluation module can also be further used for based on SNR criterion or SINR criterion in code book
Codebook vectors be estimated.
In enforcement, feedback module can also be further used for base station feedback have maximum SNR value or
The codebook vectors of SINR value.
In enforcement, feedback module can also be further used for when to base station feedback codebook vectors, and feedback is described
SNR value that codebook vectors is corresponding or SINR value.
In enforcement, feedback module can also be further used for when to base station feedback codebook vectors feeding back M
Codebook vectors, M is digital channel number.
Fig. 6 is base station side pre-coding apparatus structural representation, as it can be seen, may include that
Receiver module 601, for receiving the codebook vectors of terminal feedback, described codebook vectors be terminal according to
Approximated channel h obtains after being estimated the codebook vectors in code book；
Simulation precoding matrix module 602, for constituting simulation pre-coding matrix according to described codebook vectors；
Equivalent channel module 603, for obtaining equivalent channel according to simulation pre-coding matrix.
In enforcement, simulation precoding matrix module is further used for receiving the codebook vectors of terminal feedback
After, determine that codebook vectors is constituted by the number of times of terminal feedback, front M the codebook vectors selecting number of times most
Simulation pre-coding matrix, M is digital channel number.
In enforcement, receiver module can also be further used for when receiving terminal to base station feedback codebook vectors,
Receive SNR value corresponding to described codebook vectors or SINR value.
In enforcement, simulation precoding matrix module be further used for receive terminal to the code book of base station feedback to
After amount and SNR value corresponding to described codebook vectors or SINR value, according to the SNR value that codebook vectors is corresponding
Or SINR value number determines the capacity of codebook vectors, front M the codebook vectors selecting capacity maximum is pre-for simulation
Encoder matrix, M is digital channel number.
In enforcement, equivalent channel module can also be further used for obtaining equivalence according to simulation pre-coding matrix
During channel, obtain approximated channel h of each terminal, and form approximated channel h；According to simulation precoding square
Battle array obtains equivalent channel with approximated channel h.
For convenience of description, each several part of apparatus described above is divided into various module or unit respectively with function
Describe.Certainly, can be the function of each module or unit at same or multiple softwares when implementing the present invention
Or hardware realizes.
When implementing the technical scheme that the embodiment of the present invention provides, can implement as follows.
Fig. 7 is terminal structure schematic diagram, as it can be seen, subscriber equipment includes:
Processor 700, for reading the program in memorizer 720, performs following process:
Terminal exports approximated channel h；
Being estimated the codebook vectors in code book according to approximated channel h, described code book is base station and terminal institute
The code book known altogether；
Transceiver 710, for sending data under the control of processor 700, performs following process:
According to assessment result to base station feedback codebook vectors.
In enforcement, described approximated channel h is approximated channel h based on Los footpath angle-determining, or, based on
Approximated channel h that the mode that descending code book is measured determines.
In enforcement, it is estimated the codebook vectors in code book being to carry out based on SNR criterion or SINR criterion
Assessment.
In enforcement, terminal has maximum SNR value or the codebook vectors of SINR value to base station feedback.
In enforcement, farther include: when to base station feedback codebook vectors, feed back described codebook vectors corresponding
SNR value or SINR value.
In enforcement, feeding back M codebook vectors when base station feedback codebook vectors, M is digital channel number.
Wherein, in the figure 7, bus architecture can include bus and the bridge of any number of interconnection, specifically by
The various electrical chains of the memorizer that one or more processors of processor 700 representative and memorizer 720 represent
It is connected together.Bus architecture can also be by such as ancillary equipment, manostat and management circuit or the like
Other electrical chains various are connected together, and these are all to it is known in the art, therefore, the most no longer enter it
Row further describes.EBI provides interface.Transceiver 710 can be multiple element, i.e. includes sending
Machine and receiver, it is provided that for the unit communicated with other devices various over a transmission medium.For different
Subscriber equipment, user interface 730 can also is that can external in connect the interface needing equipment, the equipment of connection
Include but not limited to keypad, display, speaker, mike, stick etc..
Processor 700 is responsible for bus architecture and common process, and memorizer 720 can store processor
700 data used when performing operation.
Fig. 8 is architecture of base station schematic diagram, as it can be seen, base station includes:
Processor 800, for reading the program in memorizer 820, performs following process:
Simulation pre-coding matrix is constituted according to described codebook vectors；
Equivalent channel is obtained according to simulation pre-coding matrix；
Transceiver 810, for sending data under the control of processor 800, performs following process:
Receive terminal feedback codebook vectors, described codebook vectors be terminal according to approximated channel h in code book
Codebook vectors be estimated after obtain.
In enforcement, described output according to described codebook vectors simulates pre-coding matrix, including:
After receiving the codebook vectors of terminal feedback, determine that described codebook vectors is by the number of times of terminal feedback；
Front M the codebook vectors selecting number of times most constitutes simulation pre-coding matrix, and M is digital channel number.
In enforcement, when receiving terminal to base station feedback codebook vectors, receive described codebook vectors corresponding
SNR value or SINR value.
In enforcement, receive the terminal codebook vectors to base station feedback and SNR value corresponding to these vectors or
After SINR value, the SNR value corresponding according to codebook vectors or SINR value number determine the appearance that codebook vectors is corresponding
Amount, front M the codebook vectors selecting capacity maximum is simulation pre-coding matrix, and M is digital channel number.
In enforcement, obtain equivalent channel according to simulation pre-coding matrix, including:
Obtain approximated channel h of each terminal, and form approximated channel h；
Equivalent channel is obtained with approximated channel h according to simulation pre-coding matrix.
Wherein, in fig. 8, bus architecture can include bus and the bridge of any number of interconnection, specifically by
The various electrical chains of the memorizer that one or more processors of processor 800 representative and memorizer 820 represent
It is connected together.Bus architecture can also be by such as ancillary equipment, manostat and management circuit or the like
Other electrical chains various are connected together, and these are all to it is known in the art, therefore, the most no longer enter it
Row further describes.EBI provides interface.Transceiver 810 can be multiple element, i.e. includes sending
Machine and transceiver, it is provided that for the unit communicated with other devices various over a transmission medium.Processor 800
Being responsible for bus architecture and common process, memorizer 820 can store processor 800 and perform operation
Time the data that used.
In sum, in the embodiment of the present invention, provide the estimation of analog domain channel, the assessment of terminal code book, mould
Intend precoding, embodiment based on equivalent channel precoding with numeric field.This programme can improve simulation and
The precision of digital precode, reduces channel feedback expense.Meanwhile, terminal can also dynamically adjust the mould of feedback
Intend the number of codebook vectors, be so adapted to the digital channel number of different base station end, make full use of difference
All of digital channel resource.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot
The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (include but not limited to disk memory and
Optical memory etc.) form of the upper computer program implemented.
The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (22)
1. a method for precoding, it is characterised in that including:
Terminal exports approximated channel h；
Being estimated the codebook vectors in code book according to approximated channel h, described code book is base station and terminal institute
The code book known altogether；
According to assessment result to base station feedback codebook vectors.
Method the most according to claim 1, it is characterised in that described approximated channel h is based on Los
Approximated channel h of footpath angle-determining, or, approximated channel h that the mode measured based on descending code book determines.
Method the most according to claim 1, it is characterised in that the codebook vectors in code book is carried out
Assessment is estimated based on SNR criterion or SINR criterion.
Method the most according to claim 3, it is characterised in that terminal has maximum to base station feedback
SNR value or the codebook vectors of SINR value.
5. according to the method described in claim 3 or 4, it is characterised in that farther include: to base
During feedback codebook vectors of standing, feed back SNR value corresponding to described codebook vectors or SINR value.
6. according to the arbitrary described method of claim 1 to 5, it is characterised in that to base station feedback code book
M codebook vectors of feedback during vector, M is digital channel number.
7. a method for precoding, it is characterised in that including:
Receive terminal feedback codebook vectors, described codebook vectors be terminal according to approximated channel h in code book
Codebook vectors be estimated after obtain；
Simulation pre-coding matrix is constituted according to described codebook vectors；
Equivalent channel is obtained according to simulation pre-coding matrix.
Method the most according to claim 7, it is characterised in that described defeated according to described codebook vectors
Go out to simulate pre-coding matrix, including:
After receiving the codebook vectors of terminal feedback, determine that described codebook vectors is by the number of times of terminal feedback；
Front M the codebook vectors selecting number of times most constitutes simulation pre-coding matrix, and M is digital channel number.
Method the most according to claim 7, it is characterised in that farther include: receiving terminal
When base station feedback codebook vectors, receive SNR value corresponding to described codebook vectors or SINR value.
Method the most according to claim 9, it is characterised in that receiving terminal to base station feedback
After codebook vectors and SNR value corresponding to described codebook vectors or SINR value, corresponding according to codebook vectors
SNR value or SINR value number determine the capacity of codebook vectors, select front M the codebook vectors that capacity is maximum
For simulation pre-coding matrix, M is digital channel number.
11. according to the arbitrary described method of claim 7 to 10, it is characterised in that prelist according to simulation
Code matrix obtains equivalent channel, including:
Obtain approximated channel h of each terminal, and form approximated channel h；
Equivalent channel is obtained with approximated channel h according to simulation pre-coding matrix.
12. 1 kinds of pre-coding apparatus, it is characterised in that including:
Channel module, for exporting approximated channel h in terminal；
Evaluation module, for the codebook vectors in code book being estimated according to approximated channel h, described code book
It is the base station code book well known with terminal；
Feedback module, is used for according to assessment result to base station feedback codebook vectors.
13. devices according to claim 12, it is characterised in that channel module is further used for base
In Los footpath angle-determining approximated channel h, or, the mode measured based on descending code book determines approximated channel h.
14. devices according to claim 12, it is characterised in that evaluation module is further used for base
In SNR criterion or SINR criterion, the codebook vectors in code book is estimated.
15. devices according to claim 14, it is characterised in that feedback module be further used for
Base station feedback has maximum SNR value or the codebook vectors of SINR value.
16. according to the device described in claims 14 or 15, it is characterised in that feedback module is used further
In when to base station feedback codebook vectors, feed back SNR value corresponding to described codebook vectors or SINR value.
17. according to the arbitrary described device of claim 12 to 15, it is characterised in that feedback module enters one
Step is for feeding back M codebook vectors when to base station feedback codebook vectors, and M is digital channel number.
18. 1 kinds of pre-coding apparatus, it is characterised in that including:
Receiver module, for receiving the codebook vectors of terminal feedback, described codebook vectors is that terminal is according to approximation
Channel h obtains after being estimated the codebook vectors in code book；
Simulation precoding matrix module, for constituting simulation pre-coding matrix according to described codebook vectors；
Equivalent channel module, for obtaining equivalent channel according to simulation pre-coding matrix.
19. devices according to claim 18, it is characterised in that simulation precoding matrix module enters
One step for after receiving the codebook vectors of terminal feedback, determine codebook vectors by the number of times of terminal feedback,
Front M the codebook vectors selecting number of times most constitutes simulation pre-coding matrix, and M is digital channel number.
20. devices according to claim 18, it is characterised in that receiver module is further used for
Reception terminal, when base station feedback codebook vectors, receives SNR value corresponding to described codebook vectors or SINR value.
21. devices according to claim 20, it is characterised in that simulation precoding matrix module enters
One step for receive the terminal codebook vectors to base station feedback and SNR value corresponding to described codebook vectors or
After SINR value, the SNR value corresponding according to codebook vectors or SINR value number determine the capacity of codebook vectors,
Front M the codebook vectors selecting capacity maximum is simulation pre-coding matrix, and M is digital channel number.
22. according to the arbitrary described device of claim 18 to 21, it is characterised in that equivalent channel module
It is further used for, when obtaining equivalent channel according to simulation pre-coding matrix, obtaining the approximated channel of each terminal
H, and form approximated channel h；Equivalent channel is obtained with approximated channel h according to simulation pre-coding matrix.
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| CN109245803B (en) * | 2018-11-16 | 2020-06-30 | 西安科技大学 | Fast channel estimation and hybrid precoding method and system |
| CN110011712B (en) * | 2019-03-27 | 2020-07-28 | 西北工业大学 | Millimeter wave large-scale multi-input multi-output-oriented hybrid precoding method |
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