CN108242943A - The method and apparatus of precoding is used in communication - Google Patents
The method and apparatus of precoding is used in communication Download PDFInfo
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- CN108242943A CN108242943A CN201611209487.XA CN201611209487A CN108242943A CN 108242943 A CN108242943 A CN 108242943A CN 201611209487 A CN201611209487 A CN 201611209487A CN 108242943 A CN108242943 A CN 108242943A
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The method and apparatus that embodiment of the disclosure is related to being used for precoding in communication.The network equipment sends the pilot signal for utilizing the predetermined matrices for meeting RIP and being modeled precoding at least one terminal device.Terminal device persistently receives the pilot signal from the network equipment, and obtain angle domain channel response information using compressed sensing algorithm, based on the pilot signal having received, channel space correlation matrix is determined, and the information of channel space correlation matrix is sent to the network equipment based on angle domain channel response information.The network equipment receives the information of the channel space correlation matrix from all terminal devices, then stops pilot signal transmitted, and determine pre-coding matrix based on the information of channel space correlation matrix.It is possible thereby to realize determining for channel space correlation matrix with the use of minimum pilot signal, so as to save pilot signal overhead, system complexity is reduced, while quick determine mixing pre-coding scheme.
Description
Technical field
Embodiment of the disclosure is related to wireless communication field, the method and apparatus for more particularly relating to precoding.
Background technology
With universal and mobile Internet business the development of intelligent terminal, the 5th third-generation mobile communication technology (5G) is to data
Transmission rate proposes higher requirement.Multiple-input and multiple-output (MIMO) aerial array or " extensive MIMO " technology are as 5G's
A key technology just increasingly attracts attention.
The essential characteristic of MIMO is on a large scale：Tens of even hundreds of or more antennas are configured in base station coverage area,
Increase more than a magnitude compared with 4 (or 8) root antenna numbers in fourth generation mobile communication technology (4G) system, these antenna is to advise greatly
The mode of mode array concentrates placement.Extensive MIMO technology can more fully utilize Spatial Dimension as a result, significantly be promoted
Spectrum efficiency and power efficiency help operator to utilize existing resource to greatest extent.
However, due to disposing a large amount of antenna element in extensive mimo system, traditional complete digital precode is not
It is applicable in again, because it can cause almost infeasible high hardware cost and implementation complexity.Currently, mixing is precoded into receive
That attractes attention is directed to the solution of cost and complexity issue.
Invention content
Generally, embodiment of the disclosure provides the method and apparatus for precoding.
In one aspect of the present disclosure, a kind of method for precoding implemented at the network equipment is provided.This method
Including：To at least one terminal device pilot signal transmitted, the pilot signal utilizes the predetermined of satisfaction limitation isometry (RIP)
Matrix and be modeled precoding；The information of the channel space correlation matrix from least one terminal device is received, it is described
Channel space correlation matrix is to utilize to believe by compressed sensing algorithm, the angle domain channel response obtained based on the pilot signal
It ceases and determines；And pre-coding matrix for mixing precoding is determined based on the information of the channel space correlation matrix.
In another aspect of the present disclosure, a kind of method for precoding implemented at terminal device is provided.This method
Including：Pilot signal is received from the network equipment, the pilot signal is modeled precoding using the predetermined matrices for meeting RIP；
Channel is determined using by compressed sensing algorithm, the angle domain channel response information obtained based on the pilot signal received
Spatial correlation matrix；And the information of the channel space correlation matrix is sent to the network equipment so that the network is set
The standby pre-coding matrix determined for mixing precoding.
In another aspect of the present disclosure, a kind of network equipment is provided.The equipment includes：Transceiver is configured for extremely
A few terminal device pilot signal transmitted, the pilot signal are modeled precoding using the predetermined matrices for meeting RIP, with
And the information of the channel space correlation matrix from least one terminal device is received, the channel space correlation matrix is
It is determined using the angle domain channel response information obtained by compressed sensing algorithm, based on the pilot signal；And control
Device, the information for being configured for the channel space correlation matrix determine pre-coding matrix for mixing precoding.
In another aspect of the present disclosure, a kind of terminal device is also provided.The equipment includes：Transceiver, be configured for from
The network equipment receives pilot signal, and the pilot signal is modeled precoding using the predetermined matrices for meeting RIP and will letter
The information of road spatial correlation matrix is sent to the network equipment so that the network equipment is used to determine to mix precoding
Pre-coding matrix；And controller, it is configured for utilizing and believe by compressed sensing algorithm, based on the pilot tone received
Number obtained angle domain channel response information determines the channel space correlation matrix.
According to the scheme of the embodiment of the present disclosure, mixing pre-coding scheme can be quickly determined, and substantially reduce pilot tone letter
Number expense and complexity.
It should be appreciated that the content described in Summary is not intended to limit the key or again of the embodiment of the present disclosure
Feature is wanted, it is also non-to be used to limit the scope of the present disclosure.The other feature of the disclosure will be easy to understand by following description.
Description of the drawings
With reference to attached drawing and with reference to described further below, above and other feature, advantage and the aspect of each embodiment of the disclosure
It will be apparent.In the accompanying drawings, the same or similar reference numeral represents the same or similar element, wherein：
Fig. 1 shows the schematic diagram of mixing precoding framework that the embodiment of the present disclosure can be implemented within；
Fig. 2 shows the signals for the example communication and processing procedure that precoding is used in the communication according to the embodiment of the present disclosure
Figure；
Fig. 3 shows the flow of the method for precoding implemented at the network equipment according to the embodiment of the present disclosure
Figure；
Fig. 4 shows the flow of the method for precoding implemented at terminal device according to the embodiment of the present disclosure
Figure；
Fig. 5 shows curve graph of the method according to the embodiment of the present disclosure compared with the performance of conventional method；
Fig. 6 shows the curve graph of the performance evaluation of the method for precoding according to the embodiment of the present disclosure；
Fig. 7 shows the structural frames of the device for precoding implemented at the network equipment according to the embodiment of the present disclosure
Figure；
Fig. 8 shows the structural frames of the device for precoding implemented at terminal device according to the embodiment of the present disclosure
Figure；And
Fig. 9 shows the structure diagram of the equipment according to the embodiment of the present disclosure.
Specific embodiment
Embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although shown in the drawings of some of the disclosure
Embodiment, it should be understood that, the disclosure can be realized, and should not be construed as being limited to this by various forms
In the embodiment that illustrates, it is in order to more thorough and be fully understood by the disclosure to provide these embodiments on the contrary.It should be understood that
It is being given for example only property of the accompanying drawings and embodiments effect of the disclosure, is not intended to limit the protection domain of the disclosure.
Term " network equipment " as used herein refers to other realities in base station or communication network with specific function
Body or node." base station " (BS) can represent node B (NodeB either NB), evolution node B (eNodeB or eNB), long-range nothing
Line electric unit (RRU), radio-frequency maser (RH), remote radio heads (RRH), repeater or such as femto base station, femto base
Low power nodes stood etc. etc..In the context of the disclosure, to discuss convenient purpose, term " network equipment " and " base
Stand " it may be used interchangeably.
Term " terminal device " as used herein or " user equipment " (UE) be refer between base station or each other it
Between any terminal device for carrying out wireless communication.As an example, terminal device can include mobile terminal (MT), subscriber stations
(SS), portable subscriber platform (PSS), mobile station (MS) or access terminal (AT) and vehicle-mounted above equipment.In the disclosure
Context in, to discuss convenient purpose, term " terminal device " and " user equipment " may be used interchangeably.
Term " comprising " as used herein and its deformation are that opening includes, i.e., " include but not limited to ".Term "based"
It is " being based at least partially on ".Term " one embodiment " expression " at least one embodiment "；Term " another embodiment " represents
" at least one other embodiment ".The related definition of other terms provides in will be described below.
As previously mentioned, mixing is precoded into the solution party for cost and complexity issue to attract attention
Case.Fig. 1 shows the schematic diagram of mixing precoding framework 100 that the embodiment of the present disclosure can be implemented within.It as shown in Figure 1, should
Framework 100 can include base-band digital precoder 110, multiple (as an example, 4 are shown in figure) radio frequency (RF) link 120,
Simulate the array 140 of precoder 130 and multiple (as an example, 64 are shown in figure) antennas.Data flow to be sent via
Digital precode device 110 performs time domain to the conversion of frequency domain so as to be mapped on each subcarrier.Each RF in RF links 120
Link is connected to each antenna in aerial array 140 via the simulation precoder 130 by multiple phase shifter configurations.Thus
In precoding framework 100 is mixed, the use of expensive RF links is reduced using cheap phase shifter.
However, the value for determining mixing pre-coding scheme and a large amount of phase shifters is a huge challenge.Current one kind
Scheme is to perform beam scanning to determine analog domain beam forming.The process needs to expend a large amount of training wave beams, to select
Having in wave beam has the wave beam of maximal received power as analog domain beam forming.For having the extensive of a large amount of antenna elements
For mimo system, the quantity of training wave beam can be extremely huge.Existing wave beam training process is often in each OFDM
A trained wave beam is sent in symbol.For extensive mimo system, which often causes high pilot signal overhead, because
A large amount of training wave beams are transmitted to need to send a large amount of OFDM symbols.Therefore, wave beam alignment procedures will occupy a considerable amount of money
Source.What this high expense was even bound to arouse fear in multi-user's cell equipped with mutiple antennas.In this case, base station
It will need to distribute resource for each single user for uplink beam scanning process.
Alternatively, can mixing precoding be determined based on channel space correlation matrix, is based on instantaneous
The information of channel state information (CSI).However, the program is also required to send a large amount of OFDM symbols for including a large amount of training wave beams,
Its number is at least identical with antenna element number.Therefore, high pilot signal overhead and complexity can also be caused.
In view of the foregoing, the basic conception of the embodiment of the present disclosure is, instead of obtaining instantaneous CSI information, utilizes angle
Domain channel response it is openness, estimate that power perspective is distributed using compressed sensing (CS) algorithm (or continuous CS algorithms)
(PAP) so that can be led in the case where complete channel estimation (obtaining instantaneous CSI information) need not be performed based on a small amount of
Frequency signal quickly determines channel space correlation matrix, then determines mixing pre-coding scheme.Wherein by way of Step wise approximation,
Determining for channel space correlation matrix, so as to save pilot signal overhead, drop are realized with the use of minimum pilot signal
Low system complexity.For ease of understanding, it is described in more detail with reference to Fig. 2.
Fig. 2 shows the example communications and processing procedure 200 that precoding is used in the communication according to the embodiment of the present disclosure
Schematic diagram.Interaction between the network equipment and terminal device can be passed through according to the method for precoding of the embodiment of the present disclosure
To implement.The example using base station as the example of the network equipment and using UE as terminal device is described in more detail below.
It is understood that embodiment of the disclosure is suitable for the other kinds of network equipment and/or terminal device, whether at present
It is knowing or exploitation in the future.
As shown in Fig. 2, base station 210 sends 211 at least one UE 220 (UE for simplicity, is only shown in figure)
Pilot signal.Correspondingly, UE 220 receives 212 pilot signals.
In accordance with an embodiment of the present disclosure, which is modeled precoding using the predetermined matrices for meeting RIP.This is pre-
Set matrix is in order to which application PAP estimates and is pre-designed, the training matrix for simulating precoding for pilot signal.
In embodiment of the disclosure, which can be random matrix.It, can be with for example, in one embodiment
Generate the predetermined matrices in the following way.First, independent identically distributed complex random variable is randomly choosed from Gaussian function
As matrix element, the mean value of the wherein complex random variable is 0 and variance is 1.It next, can be by making each matrix element
The norm of element is 1.
In an alternative embodiment, the predetermined matrices can be generated in the following way：Matrix element selected as is referred to again
Number Sequence ejω, wherein ω be from set [0,2 π) it is randomly selected.It will be appreciated that predetermined matrices are not limited to above-mentioned listed shape
Formula, can be known in the art or the arbitrary matrix for meeting RIP of following exploitation.It will be described in detail later about RIP.At this
In disclosed embodiment, base station can sequentially send the OFDM symbol for carrying pilot signal (one by one).
In embodiment of the disclosure, base station can monitor the number of transmitted OFDM symbol, and if transmitted OFDM symbol
Number reach predetermined threshold, then stop pilot signal transmitted.It is possible thereby to reduce unnecessary pilot signal overhead.
As shown in Fig. 2, after 212 pilot signals are received, UE 220 can determine 213 using angle domain channel response information
Channel space correlation matrix, the angle domain channel response information are obtained using CS algorithms, based on the pilot signal received.
In embodiment of the disclosure, predetermined matrices are all previously known for both base station 210 and UE 220.In the reality of the disclosure
It applies in example, at least one UE can include multiple UE.Each UE just utilizes compressed sensing whenever an OFDM symbol is received
Algorithm is estimated to characterize angle domain channel response information for the pilot signal in all OFDM symbols received until current
Channel gain, until the channel gain that estimates can be used for determining channel space correlation matrix.Then, UE 220 will be true
The information of fixed channel space correlation matrix sends 214 to base station 210.
Correspondingly, base station 210 receives the 215 channel space correlation matrixes from UE 220.In embodiment of the disclosure,
At least one UE can include multiple UE.Base station 210 may determine whether to receive the channel space Correlation Moment from all UE
Battle array, and if having been received by the channel space correlation matrix from all UE, stop pilot signal transmitted.It therefore ensures that
Minimum pilot-frequency expense.Then base station 210 can be determined based on the channel space correlation matrix received 216 for mix prelist
The pre-coding matrix of code.In embodiment of the disclosure, after channel space correlation matrix determines, base station can be estimated to be used for
Mix the pre-coding matrix of precoding.About the estimation procedure of pre-coding matrix, which is not described herein again, in order to avoid obscure the present invention.
It is described in detail in the method for precoding implemented respectively at base station and UE respectively with reference to Fig. 3 and Fig. 4
More specific example embodiment.Fig. 3 shows the method 300 for precoding implemented in base station according to the embodiment of the present disclosure
Flow chart.This method can be implemented at the base station of such as Fig. 2 210.As shown in figure 3,310, base station 210 can send and lead
Frequency signal.In accordance with an embodiment of the present disclosure, base station 210 can sequentially send the OFDM symbol of carrying pilot signal.
320, base station 210 may determine whether to receive the information of the channel space correlation matrix from all UE.
In embodiment of the disclosure, base station 210 can for example monitor the data receiver of uplink in real time or periodically, so that it is determined that
Whether the information of channel space correlation matrix from all UEs is received.
If determining to receive the information of the channel space correlation matrix from all UE not yet 320,330,
Base station 210 can determine whether the number of transmitted OFDM symbol reaches predetermined threshold.In embodiment of the disclosure, base station
210 for example can monitor in real time or periodically the number of transmitted OFDM symbol, so that it is determined that transmitted OFDM symbol
Number whether reach predetermined threshold.
If the number for determining transmitted OFDM symbol 330 reaches predetermined threshold not yet, continue to send 310
Pilot signal.If the number for determining transmitted OFDM symbol 330 has reached predetermined threshold, stop sending 340 and lead
Frequency signal.Unnecessary pilot signal overhead is avoided as a result,.
On the other hand, if the information for determining to receive the channel space correlation matrix from all UE 320,
350, the pre-coding matrix for mixing precoding is determined based on the channel space correlation matrix received.The processing class of the step
It is similar to above in conjunction with the processing described in the 216 of Fig. 2, which is not described herein again.
Fig. 4 shows the flow chart for the method 400 for precoding implemented at UE implemented according to the disclosure.The party
Method can be implemented at the UE 220 of Fig. 2.As shown in figure 4,410, UE 220 can receive pilot signal.According to the disclosure
Embodiment, UE 220 can be sequentially received the OFDM symbol of carrying pilot signal.
420, based on the pilot signal and predetermined matrices carried in the OFDM symbol received until current, UE 220 is true
Settled preceding channel gain (present channel gain vector).As mentioned by above in conjunction with the 213 of Fig. 2, each UE is whenever receiving
Until being directed to currently using compressed sensing algorithm during one OFDM symbol in all OFDM symbols received
Pilot signal estimates channel gains vector, channel gains vector characterization angle domain channel response information and PAP, then base
Channel space correlation matrix can be determined in channel gains vector.This point be the present inventor structure geometry channel model and obtain
It arrives, is explained below.
The extensive mimo system of multi-user of downlink is considered in embodiment of the disclosure.For example, within the system
It can include the UE of base station BS and two single antenna.For example, BS can include NRFA RF links, the NRFA RF link connections NtIt is a
Transmitting antenna, it is assumed that the NtA transmitting antenna is uniform linear array (ULA) and the NtIt is separated for example between a transmitting antenna
Half wavelength.
For ofdm system, signal s passes through precoding vector before transmissionWeighting.The precoding to
Amount is base-band digital precoding vectorWith simulation precoding vectorCombination.Then
The signal r that k subcarrier receiveskIt can be written as：
Wherein, h represents Nt× 1 channel vector, e represent white Gaussian noise.
The geometry channel model represented by formula (1) is considered in embodiment of the disclosure.In the geometry channel model, letter
Road vector can be written as：
Wherein, αlRepresent the multiple array gain of l-th of propagation path, L is the sum of propagation path.Represent array
Response vector,It is wave of the path in aximuthpiston from direction (DoD).For the ULA with N number of antenna element, array
Response vectorWith following form：
Wherein, k=2 π/λ and d are the distance between antenna element.
Assuming thatRepresent discrete Fourier transform (DFT) matrix, WlIt is l-th of column vector.Here it is possible to use W
In column vector represent the N in aximuthpistontA difference DoD, that is,Assuming that
Then channel vector can be written as：
Wherein, 1/N is utilizedtResolution quantisation angle domain, and h is NtN on a DoDtThe summation in a path.Pay attention to
It arrives, vectorial α is sparse, because the number in strong reflection path is limited.
In embodiment of the disclosure, the signal from different RF links occupies orthogonal sub-carriers.Thus, in single sub- load
Signal on wave is mapped to only one RF links.Therefore, by the digital precode vector f on each subcarrierBB, kIt is designed as
All 0 but at the index corresponding to mapped RF links be 1, that is, fBB, k=[0 ..., 0,1,0 ..., 0]T.It is then pre-
Coding vector fkFor in FRFOne column vector f of middle selectionRF, indicate to be connected to the value of the phase shifter of single RF links.Total band
Width is bisected into NRFA RF links.Therefore, each OFDM symbol can transmit NRFA trained wave beam, so as to the number of training wave beam
Mesh is proportional to the number of RF links.Assuming thatFor FRFIn NRFA column vector, then for each OFDM symbol
For, the signal received can be written as：
Wherein,N=1,2 ..., NRFIt represents wherein using the t easet ofasubcarriers of same precoding vector.
For the sake of simplicity it is assumed that signal s is a unit on all subcarriers, andIt represents in t easet ofasubcarriers
Subcarrier sum.It is overall aboveThe signal received can formA vector：
WhereinIf receiving m OFDM symbol, the signal and transmitted training wave that receive
Beam will increase m times.Each received signal vectorSize be mNRF×1.Assuming thatAs
The precoding vector of stacking, then received signal vector can be written as：
Wherein F=[FRF, 1；FRF, 2；...；FRF, m], and FRF, i, i=1,2 ..., m are passed in i-th of OFDM symbol
The pre-coding matrix sent.
It then can be from rnEstimate complex gain vector α using suitable training beamforming matrix F.When obtaining on all DoD
Channel gains vector when, can estimate that channel space correlation matrix R is as follows：
WhereinIt is from received signal vector rnThe complex gain vector of estimation, referred to herein as channel gains vector.
Channel gains vector can characterize the angle domain channel response information for receiving signal, therefore R remains angle domain channel response letter
Breath, and can be used for accurately generating the pre-coding matrix for simulating precoding.
Due to channel gains vector α have it is openness, in embodiment of the disclosure can be using CS algorithms come only
Using than NtThe reception signal of much less quickly estimates α.It it is desirable that can be in the number (mN of training wave beamRF) not less than Nt
Shi Huifu vectors α.Received signal vector in formula (7) can be further written as：
Wherein mNRF×NtMatrix A=FTW.Assuming that it is dilute to be considered as q- there is only q main nonzero values in vectorial α
It dredges.It can be using appropriately designed matrix A come from mN using CS algorithmsRFRestore the vector α, wherein cqlog in a reception signal
(Nt/ q) ＜ mNRF＜ ＜ NtAnd c ＞ 0.
Matrix A needs are carefully designed to restore high-dimensional vector α from low dimensional vector r.Matrix A is dilute for retaining q-
The nonzero information for dredging vector α and the sufficient and necessary condition for realizing reconstruct are to meet RIP.If meeting following formula (10), claim matrix A
Meet RIP.
Any of which vector v all has up to 2q nonzero element and constant ε ＞ 0.
It, in embodiment of the disclosure thus will be for the simulation precoding of pilot signal based on the geometry channel model
Predetermined matrices F is designed as meeting RIP, as described in above in conjunction with the 210 of Fig. 2, be applied to the transmission of base station side pilot signal with
And the channel gains vector of characterization angle domain channel response information is determined in CS algorithms in UE side groups, so as to estimate channel space phase
Close matrix.
Then, predetermined matrices F, which is multiplied by DFT matrix Ws, can also meet RIP.Therefore, it can estimate that q- is dilute by following formula (11)
Dredge vector α：
Wherein μ is bundled in noise magnitude and is ordinarily selected to μ ＞ | | e | |2.Then estimated vector can be utilizedTo estimate channel space correlation matrix from above formula (8).
With continued reference to Fig. 4, present channel gain vector can be determined relative to previously received in 430, UE 220
All OFDM symbols determined by change between earlier channel gain vector whether below predetermined threshold.For example, it determines
Whether following formula (12) is true：
WhereinRepresent present channel gain vector,Represent earlier channel gain vector, τ represents predetermined threshold.
If change between 430 determining present channel gain vectors and earlier channel gain vector predetermined threshold with
Under, then 440, channel space correlation matrix is determined based on present channel gain vector.In embodiment of the disclosure, it is determining
In the case that change between present channel gain vector and earlier channel gain vector is below predetermined threshold, UE can stop
Continue to estimate channel gains vector, and channel space correlation matrix is determined based on present channel gain vector, such as based on above formula
(8) shown in.
If the change between 430 determining present channel gain vectors and earlier channel gain vector is more than predetermined threshold
Value then continues the pilot signal for receiving next OFDM symbol 410, and utilizes leading in all OFDM symbols so far received
Frequency signal determines subsequent channel gain vector, with compared with present channel gain vector, until meeting the condition in 430.
From there through the mode of Step wise approximation, determining for channel space correlation matrix is realized with the use of minimum pilot signal, from
And pilot signal overhead is saved, reduce system complexity.
After channel space correlation matrix is determined, channel space correlation matrix can be fed back to base in 450, UE 220
It stands so that base station is used to determine the pre-coding matrix for mixing precoding.The processing of the step is similar to above in conjunction with Fig. 2's
Processing described in 216, which is not described herein again.
So far the method for precoding according to the embodiment of the present disclosure is described.Process provides sequentially trained
On the one hand journey may insure to transmit minimal number of OFDM symbol so that pilot signal overhead minimizes, on the other hand can be fast
Speed determines mixing pre-coding matrix so that system complexity reduces.
Fig. 5 shows curve graph 500 of the method according to the embodiment of the present disclosure compared with the performance between conventional method.Such as
Shown in Fig. 5,510 represent the performance of the conventional method based on true CSI, and 520 represent the property of the conventional method based on instantaneous CSI
Can, 530 represent the performance of the method (being based on CS) based on the embodiment of the present disclosure.The wherein side of conventional method and the embodiment of the present disclosure
Method all uses the identical mixing precoding algorithms based on channel space correlation matrix.As it can be seen that the method for the embodiment of the present disclosure can be with
Realize the capacity similar with conventional method.But according to the method for the embodiment of the present disclosure, it is only necessary to the number of OFDM symbol is 5,
Including 20 trained wave beams, and 16 OFDM symbols is needed to transmit 64 trained wave beams in conventional methods where.As it can be seen that according to this public affairs
The method for opening embodiment can significantly reduce the number of required training wave beam so that pilot signal overhead is greatly reduced.
In addition, the number using the training wave beam needed for the method for the embodiment of the present disclosure depends on channel condition, that is, power
Angular distribution it is openness.Fig. 6 shows the curve of the performance evaluation of the method for precoding according to the embodiment of the present disclosure
Figure 60 0.It is shown using true by the method for the embodiment of the present disclosure in the case where receiving different number of OFDM symbol
The performance curve of fixed precoding.Wherein signal-to-noise ratio is 15dB.As shown in fig. 6, since the 4th OFDM symbol, performance is basic
Become stable.This shows that angle domain channel response information can be restored using 4 OFDM symbols (16 trained wave beams).According to
Embodiment of the disclosure, for LoS scenes or channel with strong reflection path, the number of OFDM symbol can smaller.
With the above-mentioned method for precoding according to the embodiment of the present disclosure correspondingly, embodiment of the disclosure also provides phase
The device for precoding answered.It is described in detail with reference to Fig. 7 and Fig. 8.
Fig. 7 shows the structural frames of the device 700 for precoding implemented in base station according to the embodiment of the present disclosure
Figure.It will be appreciated that device 700 can be realized in the base station 210 of base station, such as Fig. 2.Alternatively, device 700 can be base station
Itself.
As shown in fig. 7, device 700 can include the first transmitting element 710, the first receiving unit 720 and first determines list
Member 730.First transmitting element 710 can be configured for at least one UE pilot signal transmitteds, and the pilot signal utilizes
Meet the predetermined matrices of RIP and be modeled precoding.First receiving unit 720 can be configured for receiving from least one
The information of the channel space correlation matrix of UE, the channel space correlation matrix are to be based on utilizing compressed sensing algorithm, base by UE
It is determined respectively in the angle domain channel response information that pilot signal obtains.First determination unit 730 can be configured for
Pre-coding matrix for mixing precoding is determined based on the information of channel space correlation matrix.
In accordance with an embodiment of the present disclosure, predetermined matrices generate in the following manner：It is independent same from Gaussian function random selection
The complex random variable of distribution is as matrix element, and the mean value of the complex random variable is 0 and variance is 1；And make each
The norm of matrix element is 1.In an alternative embodiment, predetermined matrices generate in the following manner：Matrix element selected as is answered
Exponential sequence ejω, wherein ω be from set [0,2 π) randomly selected radian value.
In accordance with an embodiment of the present disclosure, at least one UE can include multiple UE.In the present embodiment, the first determination unit
730 may be further configured for：Determine whether to have received the channel space correlation matrix of each in the multiple UE
Information and the information in response to receiving the channel space correlation matrix of each in multiple UE, based on the letter
The information of road spatial correlation matrix determines the pre-coding matrix.
In accordance with an embodiment of the present disclosure, device 700 can also include monitoring unit (not shown), the monitoring unit quilt
It is configured to：The transmitted number for being used to carry the OFDM symbol of the pilot signal of monitoring；And in response to transmitted
The number of OFDM symbol reaches predetermined threshold, stops pilot signal transmitted.
Fig. 8 shows the structure diagram of the device 800 for precoding implemented at UE according to the embodiment of the present disclosure.
It will be appreciated that device 800 can be realized at UE, such as the UE 220 of Fig. 2.Alternatively, device 800 can be UE in itself.
As shown in figure 8, device 800 can include the second receiving unit 810, the second determination unit 820 and second sends list
Member 830.Second receiving unit 810 can be configured for receiving pilot signal from base station, and the pilot signal, which utilizes, meets RIP
Predetermined matrices and be modeled precoding.Second determination unit 820 can be configured for angle domain channel response information
Determine channel space correlation matrix, angle domain channel response information is believed using compressed sensing algorithm, based on the pilot tone received
Number and obtain.Second transmitting element 830 can be configured for by the information of channel space correlation matrix be sent to base station for
Base station is used to determine the pre-coding matrix for mixing precoding.
In accordance with an embodiment of the present disclosure, predetermined matrices generate in the following manner：It is independent same from Gaussian function random selection
The complex random variable of distribution is as matrix element, and the mean value of the complex random variable is 0 and variance is 1；And make each
The norm of matrix element is 1.In an alternative embodiment, predetermined matrices generate in the following manner：Matrix element selected as is answered
Exponential sequence ejω, wherein ω be from set [0,2 π) randomly selected radian value.
In accordance with an embodiment of the present disclosure, the second determination unit 820 may be further configured for：Based on receiving until current
OFDM symbol on the pilot signal and predetermined matrices that carry, determine present channel gain vector；Determine present channel gain to
Amount is relative to the change of earlier channel gain vector, and earlier channel gain vector in previously received OFDM symbol based on carrying
Pilot signal and predetermined matrices and determine；And change in response to described in predetermined threshold hereinafter, based on present channel gain
Vector determines channel space correlation matrix.
In accordance with an embodiment of the present disclosure, the second determination unit 820 may be further configured for：It is more than in response to the change
Predetermined threshold receives consecutive OFDM-symbols；And based on the pilot signal and predetermined matrices carried in the OFDM symbol received,
Determine subsequent channel gain vector so as to compared with present channel gain vector.
It should be appreciated that each unit method 300 with being described with reference to figure 3 to Fig. 4 respectively described in device 700 and 800
Each action into 400 is corresponding.Also, the operation of device 700,800 and unit wherein included and feature both correspond to
It above in association with Fig. 3 to Fig. 4 operations described and feature, and has same effect, detail repeats no more.
Fig. 9 shows the block diagram for the equipment 900 for being suitable for realizing embodiment of the disclosure.Equipment 900 can be used for realizing
Base station (such as base station 210 of Fig. 2) and/or for realizing UE (such as base station 220 of Fig. 2).
As shown in the figure, equipment 900 includes controller 910.The operation of 910 control device 900 of controller and function.For example,
In certain embodiments, controller 910 can be performed by means of the instruction 930 stored in coupled memory 920
Various operations.Memory 920 can apply to any suitable type of local technical environment, and can utilize any conjunction
Suitable data storage technology realizes that including but not limited to the memory device based on semiconductor, magnetic memory device and system, light are deposited
Memory device and system.Although illustrate only a memory cell in Fig. 9, there can be multiple physics in equipment 900
Different memory cells.
Controller 910 can apply to any suitable type of local technical environment, and can include but unlimited
In all-purpose computer, special purpose computer, microcontroller, digital signal controller (DSP) and based on controller multinuclear control
At least one of device framework is multiple.Equipment 900 can also include multiple controllers 910.Controller 910 and 940 coupling of transceiver
It closes, transceiver 940 can realize sending and receiving for information by means of at least one antenna 950 and/or other component.Note
Meaning, transceiver 940 can be individual device, can also include being respectively used to the individual devices sent and received.
When equipment 900 serves as base station, controller 910 and transceiver 940 can be with compounding practices, to realize above with reference to figure
The method 300 of 3 descriptions.When equipment 900 serves as UE, controller 910 and transceiver 940 for example can be in memories 920
Compounding practice under the control of instruction 930, to realize the method 400 described above with reference to Fig. 4.For example, transceiver 940 can be realized
The related operation of reception and/or transmission with data/information, and controller 910 performs or triggers processing, the operation to data
And/or other operations.It is suitable for equipment 900 above with reference to the described all features of Fig. 2 to Fig. 4, details are not described herein.
In general, the various example embodiments of the disclosure can hardware or special circuit, software, logic or its
What implements in combining.Some aspects can be implemented within hardware, and other aspect can by controller, microprocessor or
Implement in firmware or software that other computing devices perform.When the various aspects of embodiment of the disclosure are illustrated or described as frame
When figure, flow chart or other certain figures of use represent, it will be understood that box described herein, device, system, techniques or methods can
Using in terms of as unrestricted example in hardware, software, firmware, special circuit or logic, common hardware or controller or other
It calculates and implements in equipment or its certain combination.The example that can be used to realize the hardware device of the embodiment of the present disclosure includes but not limited to：
Field programmable gate array (FPGA), application-specific integrated circuit (ASIC), application specific standard product (ASSP), system on chip (SOC), complexity
Programmable logic device (CPLD), etc..
As an example, embodiment of the disclosure can be described in the context of machine-executable instruction, machine can be held
Row instruction is such as included in the program module performed in the device on the true or virtual processor of target.In general,
Program module includes routine, program, library, object, class, component, data structure etc., performs specific task or realizes specific
Abstract data structure.In embodiments, the function of program module can merge between described program module or
Segmentation.It can be performed in local or distributed apparatus for the machine-executable instruction of program module.In distributed apparatus
In, program module can be located locally in remote medium storage the two.
The computer program code of method for implementing the present disclosure can be write with one or more programming languages.These
Computer program code can be supplied to the processing of all-purpose computer, special purpose computer or other programmable data processing units
Device so that program code by computer or other programmable data processing units execution when, cause flow chart and/
Or function/operation is carried out specified in block diagram.Program code can completely on computers, part on computers, conduct
Independent software package, part are on computers and part is held on a remote computer or server on the remote computer or completely
Row.
In the context of the disclosure, machine readable media can include or store to be used for or perform system about instruction
Any tangible medium of the program of system, device or equipment.Machine readable media can be that machine-readable signal medium or machine can
Read storage medium.Machine readable media can include but is not limited to electronics, magnetic, it is optical, electromagnetism, infrared or partly lead
System system, device or equipment or its any appropriate combination.The more detailed example of machine readable storage medium is included with one
Or the electrical connections of multiple conducting wires, portable computer diskette, hard disk, random access memories (RAM), read-only memory
(ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), light storage device, magnetic storage apparatus or its is any appropriate
Combination.
In addition, although operation is depicted with particular order, this simultaneously should not be construed this generic operation is required to show
The operation of all diagrams with sequential order is completed or performed to particular order to obtain expected result.In some cases, it is more
Task or parallel processing can be beneficial.Similarly, although discussed above contain certain specific implementation details, this is not
It should be interpreted that any invention of limitation or the scope of the claims, and should be interpreted that the specific embodiment to specific invention can be directed to
Description.Certain features in this specification described in the context of separated embodiment can also combined implementation in single reality
It applies in example.Conversely, various features described in the context of single embodiment can also discretely multiple embodiments or
Implement in any appropriate sub-portfolio.
Although with specific to the language description of structural features and or methods of action theme, but it is to be understood that institute
The theme limited in attached claim is not limited to above-described special characteristic or action.On the contrary, above-described specific spy
Action of seeking peace is disclosed as the exemplary forms for realizing claim.
Claims (20)
1. a kind of method for precoding implemented at the network equipment, including：
To at least one terminal device pilot signal transmitted, the pilot signal utilizes the predetermined of satisfaction limitation isometry (RIP)
Matrix and be modeled precoding；
Receive the information of the channel space correlation matrix from least one terminal device, the channel space correlation matrix
It is to be determined using the angle domain channel response information obtained by compressed sensing algorithm, based on the pilot signal；And
Pre-coding matrix for mixing precoding is determined based on the information of the channel space correlation matrix.
2. according to the method described in claim 1, wherein described at least one terminal device includes multiple terminal devices, and institute
Determining pre-coding matrix is stated to include：
Determine whether to have received the information of the channel space correlation matrix of each in the multiple terminal device；
And
In response to determining to have been received by the channel space correlation matrix of each in the multiple terminal device
Information determines the pre-coding matrix based on the information of the channel space correlation matrix.
3. it according to the method described in claim 1, further includes：
The transmitted number for being used to carry Orthogonal Frequency Division Multiplexing (OFDM) symbol of the pilot signal of monitoring；And
Reach predetermined threshold in response to the number of transmitted OFDM symbol, stop sending the pilot signal.
4. the predetermined matrices are generated as follows according to the method described in claim 1, further including：
Independent identically distributed complex random variable is randomly choosed as matrix element from Gaussian function, the complex random variable
Mean value is 0 and variance is 1；And
The norm for making each matrix element is 1.
5. the predetermined matrices are generated as follows according to the method described in claim 1, further including：
By matrix element selected as complex exponential sequence ejω, wherein ω represent from set [0,2 π) randomly selected radian value.
6. a kind of method for precoding implemented at terminal device, including：
Receive pilot signal from the network equipment, the pilot signal using the predetermined matrices for meeting limitation isometry (RIP) and by
Simulate precoding；
Using the angle domain channel response information obtained by compressed sensing algorithm, based on the pilot signal received come really
Determine channel correlation matrix；And
The information of the channel space correlation matrix is sent to the network equipment so that the network equipment determines to mix
Close the pre-coding matrix of precoding.
7. according to the method described in claim 6, wherein described determining channel space correlation matrix includes：
Based on the pilot signal that is carried on Orthogonal Frequency Division Multiplexing (OFDM) symbol received until current and described predetermined
Matrix determines present channel gain；And
The present channel gain is determined relative to the change between earlier channel gain, the earlier channel gain is based on previous
The pilot signal and the predetermined matrices that are carried in the OFDM symbol received and determine；
In response to the change in predetermined threshold hereinafter, determining the channel space Correlation Moment based on the present channel gain
Battle array.
8. it according to the method described in claim 7, further includes：
It is more than the predetermined threshold in response to described change, receives consecutive OFDM-symbols；And
Based on subsequently received OFDM symbol and it is described it is current until the pilot tone letter that carries in the OFDM symbol that receives
Number and the predetermined matrices, determine subsequent channel gain so as to compared with the present channel gain.
9. the predetermined matrices are generated as follows according to the method described in claim 6, further including：
Randomly choose independent identically distributed complex random variable as matrix element from Gaussian function, the complex random variable it is equal
It is 1 to be worth for 0 and variance；And
The norm for making each matrix element is 1.
10. the predetermined matrices are generated as follows according to the method described in claim 6, further including：
By matrix element selected as complex exponential sequence ejω, wherein ω represent from set [0,2 π) randomly selected radian value.
11. a kind of network equipment, including：
Transceiver is configured for at least one terminal device pilot signal transmitted, and the pilot signal is limited using satisfaction
The predetermined matrices of isometry (RIP) and be modeled precoding and to receive channel from least one terminal device empty
Between correlation matrix information, the channel space correlation matrix by compressed sensing algorithm, based on the pilot signal using obtaining
The angle domain channel response information that arrives and determine；And
Controller, the information for being configured for the channel space correlation matrix determine precoding for mixing precoding
Matrix.
12. equipment according to claim 11, wherein at least one terminal device includes multiple terminal devices, and
The controller is additionally configured to：
Determine whether to receive the channel space correlation matrix that may be from each at least one terminal device
Information；And
In response to determining to have been received by the channel space correlation matrix of each in the multiple terminal device
Information determines the pre-coding matrix based on the channel space correlation matrix.
13. equipment according to claim 11, wherein the controller is additionally configured to：
The transmitted number for being used to carry Orthogonal Frequency Division Multiplexing (OFDM) symbol of the pilot signal of monitoring；And
Reach predetermined threshold in response to the number of transmitted OFDM symbol, stop sending the pilot signal.
14. equipment according to claim 11, wherein the predetermined matrices generate as follows：
Independent identically distributed complex random variable is randomly choosed as matrix element from Gaussian function, the complex random variable
Mean value is 0 and variance is 1；And
The norm for making each matrix element is 1.
15. equipment according to claim 11, wherein the predetermined matrices generate as follows：
By matrix element selected as complex exponential sequence ejω, wherein ω represent from set [0,2 π) randomly selected radian value.
16. a kind of terminal device, including：
Transceiver is configured for receiving pilot signal from the network equipment, and the pilot signal utilizes satisfaction limitation isometry
(RIP) predetermined matrices and be modeled precoding and the information of channel space correlation matrix be sent to the network equipment
So that the network equipment is used to determine the pre-coding matrix for mixing precoding；And
Controller is configured for utilizing through compressed sensing algorithm, the angle obtained based on the pilot signal received
Domain channel response information determines the channel space correlation matrix.
17. equipment according to claim 16, wherein the controller is additionally configured to：
Based on the pilot signal that is carried on Orthogonal Frequency Division Multiplexing (OFDM) symbol received until current and described predetermined
Matrix determines present channel gain；
Determine change of the present channel gain relative to earlier channel gain, the earlier channel gain is based on previous receipt
To OFDM symbol on the pilot signal that carries and the predetermined matrices and determine；And
In response to the change in predetermined threshold hereinafter, determining the channel space Correlation Moment based on the present channel gain
Battle array.
18. equipment according to claim 17, wherein the controller is additionally configured to：
It is more than the predetermined threshold in response to described change, receives consecutive OFDM-symbols；And
Based on subsequently received OFDM symbol and it is described it is current until the pilot tone letter that carries in the OFDM symbol that receives
Number and the predetermined matrices, determine subsequent channel gain so as to compared with the present channel gain.
19. equipment according to claim 16, wherein the predetermined matrices generate as follows：
Randomly choose independent identically distributed complex random variable as matrix element from Gaussian function, the complex random variable it is equal
It is 1 to be worth for 0 and variance；And
The norm for making each matrix element is 1.
20. equipment according to claim 16, wherein the predetermined matrices generate as follows：
By matrix element selected as complex exponential sequence ejω, wherein ω represent from set [0,2 π) randomly selected radian value.
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