CN105959046A - Wave beam forming method, signal emission equipment and signal reception equipment - Google Patents
Wave beam forming method, signal emission equipment and signal reception equipment Download PDFInfo
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- CN105959046A CN105959046A CN201610367706.0A CN201610367706A CN105959046A CN 105959046 A CN105959046 A CN 105959046A CN 201610367706 A CN201610367706 A CN 201610367706A CN 105959046 A CN105959046 A CN 105959046A
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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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
Abstract
The invention discloses a wave beam forming method. The wave beam forming method comprises steps that a downlink pilot frequency symbol sequence and an MUB codebook are acquired by the signal emission equipment, the downlink pilot frequency symbol sequence is weighted according to the MUB codebook to acquire a downlink pilot frequency symbol set, the downlink pilot frequency symbol set is sent on all antennas in a pilot frequency weighting period, a pre-coding matrix indication set sent by the signal reception equipment is received, a reconstruction channel characteristic vector is calculated according to the pre-coding matrix indication set, wave beam forming of the downlink data is carried out according to the reconstruction channel characteristic vector, precision of directive wave beams can be improved, and wave beam leakage among users can be reduced. The invention further provides the signal emission equipment and the signal reception equipment capable of realizing the wave beam forming method.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of beam form-endowing method, signal transmitting equipment and signal and receive and set
Standby.
Background technology
Beamforming technique is a kind of multiple antenna transmission technique, and its cardinal principle is to utilize the principle of interference of ripple to produce strong side
Tropism antenna pattern so that the main lobe of antenna pattern points to mobile terminal direction adaptively.Beamforming technique is permissible
The signal fadeout introduced by the factor such as space loss, multipath effect during compensating radio transmission and distortion, reduce with letter simultaneously
Interference between road user, reaches improve communication link performance and improve the purpose of power system capacity.In multiple antenna communication,
Evolved base station (Evolved Node B is called for short eNB) and subscriber equipment (User Equipment is called for short UE) are respectively arranged with
If dry aerial, between the antenna port of each transmission antenna to the antenna port of each reception antenna, form a channel.
At the multiple antenna communication using FDD (Frequency Division Duplexing is called for short FDD)
In, existing beam form-endowing method approximately as: eNB sends descending pilot frequency symbol sebolic addressing on all transmitting antennas, and UE passes through
Different reception antennas receive descending pilot frequency symbol sebolic addressing, carry out the channel between eNB to UE according to descending pilot frequency symbol sebolic addressing
Pilot channel estimation, selects the precoding mated the most with current channel condition from precoding codebook according to default Optimality Criteria
Matrix, indicates (Precoding Matrix Indicator is called for short PMI) to feed back to by feedback link by pre-coding matrix
After eNB, eNB receive PMI, with PMI for reference to selecting precoding codebook, downlink data being carried out wave beam forming.
In MU-MIMO system, the 4 dimension complex vector spaces at characteristic vector place main for channel, at Long Term Evolution (Long
Term Evolution, is called for short LTE) in R11 and version before, define only 16 pre-coding matrixes, according to above-mentioned pre-
Exist between the calculated main characteristic vector of encoder matrix and the main characteristic vector of real channel and compare significant error, for
The directional wave beam that different user produces easily intersects, and wave beam intersection can cause strong inter-user interference.
Summary of the invention
This application provides a kind of beam form-endowing method, signal launches equipment and signal receiver, it is possible to increase refer to
The precision of directional antenna beam, reduces the wave beam between user and reveals.
First aspect provides the beam form-endowing method being applied to multiple antenna communication, signal in multiple antenna communication
Transmitting equipment and signal receiver are respectively provided with aerial array, and aerial array comprises NTIndividual antenna, the method includes: signal is sent out
Jet device obtains descending pilot frequency symbol sebolic addressing and mutual unbiased base MUB code book；According to MUB code book, to descending pilot frequency symbol sequence
Row are weighted obtaining descending pilot frequency assemble of symbol；Within the pilot weighted cycle, send descending pilot frequency symbol on all antennas
Set, so that signal receiver obtains pre-coding matrix instruction group according to descending pilot frequency assemble of symbol, wherein, by each
Antenna port sends N in each pilot tone subframeTIndividual descending pilot frequency symbol；Receive the pre-coding matrix that signal receiver sends
Instruction group, calculates reconstruct channel eigenvectors according to pre-coding matrix instruction group, according to reconstruct channel eigenvectors to lower line number
According to carrying out wave beam forming.In this embodiment, signal launches equipment can carry out uniform linear transformation to channel, and signal receives
Equivalent channel after these linear transformations is quantified by equipment, and signal is launched equipment and equalled multiple different quantized result
All, the error between reconstruct channel eigenvectors and the main characteristic vector of real channel can be reduced, thus improve directivity ripple
The precision of bundle, reduces the wave beam between user and reveals.
In a kind of possible implementation, at signal transmitting equipment according to MUB code book, descending pilot frequency symbol sebolic addressing is carried out
During weighting obtains descending pilot frequency assemble of symbol, computing formula is as follows:Wherein,For
The descending pilot frequency symbol that in the s subframe, the l pilot resources of i-th antenna port maps, XlFor descending pilot frequency symbol sebolic addressing
In the l descending pilot frequency symbol,For the element of l+1 row i+1 row in the s MUB matrix in MUB code book, l is for being more than
Equal to 0 and less than NTNatural number, i is more than or equal to 0 and less than NTNatural number.
Further, signal is launched equipment and is calculated reconstruct channel eigenvectors according to pre-coding matrix instruction group, including:
Signal is launched equipment and is determined pre-coding matrix group according to pre-coding matrix instruction group；
Signal is launched equipment and is reconstructed channel matrix according to pre-coding matrix group and MUB matrix calculus, and computing formula is as follows:
Wherein, Z (t) is the reconstruct channel matrix that the t subframe is corresponding, Qs(t-τ)It is MUB square corresponding to τ subframe of t-
Battle array, wt-τIt is pre-coding matrix corresponding to τ subframe of t-,For wt-τConjugation symmetrical matrix,For Qs(t-τ)'s
Conjugation symmetrical matrix；
Signal is launched equipment and reconstruct channel matrix is carried out singular value decomposition, chooses eigenvalue of maximum characteristic of correspondence vector
As reconstruct channel eigenvectors.
In alternatively possible implementation, MUB code book is Kerdock code book.
In alternatively possible implementation, aerial array comprises 4 antennas, and MUB code book includes:
In alternatively possible implementation, aerial array comprises at least two group cross polarised antennas, and MUB code book includes:
Wherein, QkFor kth matrix in MUB code book,For kth Kerdock in the Kerdock code book that double antenna is corresponding
Matrix, 02×2The element that the matrix of expression 2 × 2 comprises is 0.
In alternatively possible implementation, aerial array comprises at least two group cross polarised antennas, and MUB matrix includes:
Wherein, QkFor kth matrix in MUB code book,It it is kth in the Kerdock code book that four antennas are corresponding
Kerdock matrix.
In alternatively possible implementation, signal is launched equipment acquisition MUB code book and is included: signal is launched equipment and obtained letter
Number receive equipment translational speed, determine the speed interval that translational speed is corresponding, according to speed interval and default corresponding relation
Determine matrix quantity；Signal launches equipment according to matrix quantity, chooses MUB matrix as MUB code book, preset from default code book
Code book comprises NT+ 1 MUB matrix.
Second aspect provides a kind of beam form-endowing method being applied to multiple antenna communication, believes in multiple antenna communication
Number transmitting equipment and signal receiver are respectively provided with aerial array, and aerial array comprises NTIndividual antenna, the method includes: signal
Reception equipment according to signal launch equipment send descending pilot frequency assemble of symbol, to transmission antenna array to receiving antenna array it
Between channel carry out channel estimation；Signal receiver obtains precoding according to the channel estimation results of each pilot tone subframe respectively
Matrix indicates, and using the pre-coding matrix that obtains in pilot period as pre-coding matrix instruction group；Signal receiver will be pre-
Encoder matrix instruction group is sent to signal and launches equipment, so that signal is launched equipment and calculated weight according to pre-coding matrix instruction group
Structure channel eigenvectors, and according to reconstruct channel eigenvectors, downlink data is carried out wave beam forming.
The third aspect provides a kind of signal to launch equipment, has and realizes the function of signal transmitting equipment in first aspect.Should
Function can be realized by hardware, it is also possible to performs corresponding software by hardware and realizes.Described hardware or software include one
Or the multiple module corresponding with above-mentioned functions.
In a kind of possible implementation, this signal is launched equipment and is included: aerial array, processor, memorizer and bus；
Being connected with each other communication by bus between aerial array, processor and memorizer, aerial array includes NTIndividual antenna is wherein, logical
Crossing the operational order calling memorizer storage, processor is used for performing following method: obtain descending pilot frequency symbol sebolic addressing and phase
Unbiased base MUB code book mutually；According to MUB code book, it is weighted obtaining descending pilot frequency assemble of symbol to descending pilot frequency symbol sebolic addressing；?
In the pilot weighted cycle, send descending pilot frequency assemble of symbol on all antennas, so that signal receiver is led according to descending
Frequency symbol set obtains pre-coding matrix instruction group, wherein, sends N by each antenna port in each pilot tone subframeTIndividual
Descending pilot frequency symbol；Receive the pre-coding matrix instruction group that signal receiver sends, calculate according to pre-coding matrix instruction group
Reconstruct channel eigenvectors, carries out wave beam forming according to reconstruct channel eigenvectors to downlink data.
Fourth aspect provides a kind of signal receiver, has and realizes the function of signal receiver in second aspect.Should
Function can be realized by hardware, it is also possible to performs corresponding software by hardware and realizes.Described hardware or software include one
Or the multiple module corresponding with above-mentioned functions.
In a kind of possible implementation, this signal receiver includes: aerial array, processor, memorizer and bus；
Being connected with each other communication by bus between aerial array, processor and memorizer, aerial array includes NTIndividual antenna is wherein, logical
Crossing the operational order calling memorizer storage, processor is used for performing following method: launch the descending of equipment transmission according to signal
Pilot symbols set, carries out channel estimation, wherein, by each to the channel between transmission antenna array to receiving antenna array
N is received in antenna port row pilot tone subframe in each of the lowerTIndividual descending pilot frequency symbol；Respectively according to the channel of each pilot tone subframe
Estimated result obtains pre-coding matrix instruction, and the pre-coding matrix obtained in pilot period instruction is referred to as pre-coding matrix
Show group；Pre-coding matrix indicates group be sent to signal and launches equipment, so that signal is launched equipment and referred to according to pre-coding matrix
Show that group calculates reconstruct channel eigenvectors, and according to reconstruct channel eigenvectors, downlink data is carried out wave beam forming.
In the technical scheme that the application provides, signal is launched equipment and is used MUB code book to enter descending pilot frequency symbol sebolic addressing
Row weighting obtains descending pilot frequency assemble of symbol, and signal receiver carries out channel according to descending pilot frequency assemble of symbol to channel and estimates
Meter, and obtain precoding instruction group, signal is launched equipment and is calculated reconstruct channel eigenvectors according to precoding instruction group, according to this
Reconstruct channel eigenvectors carries out wave beam forming to downlink data.Owing to matrix each in MUB code book is by equidistant basal orientation
Amount composition, therefore signal transmitting equipment can carry out uniform linear transformation to channel, and signal receiver is linear to these
Equivalent channel after conversion quantifies, and signal is launched equipment and is averaged multiple different quantized result, can reduce weight
Error between structure channel eigenvectors and the main characteristic vector of real channel, thus improve the precision of directional wave beam, reduce
Wave beam between user is revealed.
Accompanying drawing explanation
Fig. 1 is a schematic diagram of beam form-endowing method in prior art；
Fig. 2 is the schematic diagram that prior art arranges downlink precoding；
Fig. 3 (a) is a schematic diagram of application scenarios in the embodiment of the present invention；
Fig. 3 (b) is another schematic diagram of application scenarios in the embodiment of the present invention；
Fig. 3 (c) is another schematic diagram of application scenarios in the embodiment of the present invention；
Fig. 3 (d) is another schematic diagram of application scenarios in the embodiment of the present invention；
Fig. 4 is the principle schematic of beam form-endowing method in the embodiment of the present invention；
Fig. 5 is a signaling process figure of beam form-endowing method in the embodiment of the present invention；
Fig. 6 (a) is a schematic diagram of pilot symbol transmitted in prior art；
Fig. 6 (b) is a schematic diagram of pilot symbol transmitted in the embodiment of the present invention；
Fig. 7 is another schematic diagram of cycle pilot symbol transmitted in the embodiment of the present invention；
Fig. 8 is a schematic diagram of cross polarised antenna array in the embodiment of the present invention；
Fig. 9 is a schematic diagram of multiple antenna communication in the embodiment of the present invention.
Detailed description of the invention
For ease of understanding, the most first the technical term in the application is introduced:
1, channel quantitative code book: that communication protocol standard has been set, for quantifying matrix or the vector of mimo channel, right
It is precoding codebook (Precoding Codebook), Signal to Interference plus Noise Ratio (Signal to for LTE system
Interference plus Noise Ratio, is called for short SINR) quantify table.
2, PMI code word: in LTE system, the PMI of UE feedback is as follows at precoding codebook:
The pre-coding matrix of middle correspondence
R, i ∈ 0 ..., B-1}, B are precoding codebook sizes, line number N of matrixTBeing the antenna number of eNB, columns r is
The order of pre-coding matrix；PMI itself is the index (i) of each code word in precoding codebook.
3, the order (Rank) of feedback: the order of the precoding codebook W that UE feedback is based on.Order when being 1 each PMI code word be
One NTDimension complex column vector.The order of feedback can explicitly be limited UE by eNB in downlink signaling, it is also possible to by UE according to current
Channel quality selects voluntarily, feeds back its order used at feedback PMI simultaneously.
4, pilot weighted code book: what the present invention proposed is used for the set of matrices Q=to the weighting of multiple antennas descending pilot frequency symbol
{Q0,Q1,...,QL-1, L is pilot weighted codebook size；Wherein, each matrix Qj, j ∈ 0 ..., L-1} is also referred to as one
Pilot weighted code word.
5, channel condition information (Channel State Information is called for short CSI): real channel status information is anti-
Reflect is instantaneous channel state accurately, for mimo channel, including channel coefficient matrix, channel correlation matrix, channel characteristics
Vector etc.；The channel condition information of reconstruct refers to the above-mentioned parameter reconstruction calculations result in base station side；In LTE system, UE feeds back
CSI refer in particular to PMI, channel quality instruction (Channel Quality Indicator, be called for short CQI).
6, the main characteristic vector of channel: channel coefficient matrix is made singular value decomposition (Singular Value
Decomposition, is called for short SVD), the main characteristic vector of the i.e. channel of right singular vector that its maximum singular value is corresponding.
7, base (Mutually Unbiased Bases, the be called for short MUB) code book of unbiased each other.
The system architecture applied the technical scheme of the application below is introduced, as shown in Fig. 3 (a)～Fig. 3 (d).
Fig. 3 (a) is single community, the application of single user Multiinputoutput (Single-User MIMO is called for short SU-MIMO)
Scene schematic diagram；
Fig. 3 (b) is single community, the application of multi-user's Multiinputoutput (Multiple-User MIMO is called for short MU-MIMO)
Scene schematic diagram；
Fig. 3 (c) is collaborative multicast communication (Coordinated Multiple Points is called for short CoMP), SU-MIMO's
Application scenarios；
Fig. 3 (d) is CoMP, the application scenarios of MU-MIMO.
Wherein, eNB can include that one or more signal launches equipment, and UE can include that one or more signal receives and set
Standby, signal is launched the aerial array of equipment setting and is also referred to as transmission antenna array, and its antenna can be described as transmission antenna, and signal receives
The aerial array that equipment is put is also referred to as receiving antenna array, and its antenna can be described as reception antenna.
Owing to FDD system up-downgoing channel does not have reciprocity, LTE protocol uses the mode quantifying feedback, i.e. UE will survey
The pre-coding matrix that the down channel of amount is quantified as in limited precoding codebook, owing to precoding codebook is small,
The eNB with 4 antenna ports is only had 16 matrixes, therefore between quantized result and real channel, there is error, and this
Quantization error may be the biggest, it is also possible to less, has randomness.On the other hand, wave beam forming vector is according to down channel shape
State information calculates, and larger quantization error will cause wave beam precision poor.
Causing, in order to solve quantization error, the problem that wave beam precision is the highest, the present invention uses pilot weighted code book to lead descending
Frequency symbol is weighted, and is multiple equivalent channel by the channel conversion between base station to terminal, and multiple equivalent channel are entered by terminal
Row channel is estimated, it is thus achieved that corresponding quantization code word (PMI), and base station carries out channel reconstruction meter according to the quantization code word of terminal feedback
Calculate, it is thus achieved that reconstruct channel eigenvectors, beam shape-endowing weight value is set further according to reconstruct channel eigenvectors, downlink data is carried out
Wave beam forming.Owing to single quantization result may be big with the quantization error of real channel, it is also possible to little, therefore multiple channels are estimated
Meter result is averaging, and the result obtained is more nearly real channel.
The beam form-endowing method provided the application below describes in detail, refers to Fig. 5, and the method includes:
501, signal launches equipment acquisition descending pilot frequency symbol sebolic addressing and MUB matrix；
In existing LTE protocol, the pilot signal of antenna port is on the orthogonal transfer resource of time domain, frequency domain or code domain
Send, as shown in Figure 6.At pilot resources Rl(l=0,1 ..., NT-1), on, descending pilot frequency symbol sebolic addressing can be designated as xl(l=
0,1,...,NT-1), signal transmitting equipment can obtain descending pilot frequency symbol sebolic addressing.
Signal launches equipment can also obtain MUB code book, and MUB code book at most can comprise (NT+ 1) individual MUB matrix, MUB
Every column element of matrix is corresponding with one group of orthonormal basis.
For example, complex vector space, its two standard sets orthogonal basis ε={ e are tieed up for d1,e2,...,edAnd F={f1,
f2,...,fdIt is referred to as MUB, when space dimensionality is precisely the integral number power of certain prime number, the maximum number of MUB is (d+1).Due to
ENB antenna port number is the integral number power of 2: NT=2m, therefore equipment is launched for the signal in the present embodiment, it is possible to obtain NT+
1 group of MUB, as follows:
By the vector of each group of MUB by row composition matrix:
These matrixes i.e. constitute the MUB code book of pilot weighted:
Wherein, NTFor antenna port sum, NT=2m, m is natural number.QsIt is the s pilot weighted matrix.
It should be noted thatIt is (l+1) of s the matrix element that arranges (i+1) row, such asIt it is s
The element of the first row the first row of matrix,Being the element of the secondary series the first row of s matrix, other matrix elements can depend on
This analogizes, and here is omitted.
It is understood that obtaining descending pilot frequency symbol sebolic addressing and obtaining MUB matrix is two independent processes, there is no solid
Determining sequencing, concrete execution sequence is not construed as limiting herein.
502, signal transmitting equipment is according to MUB matrix, is weighted descending pilot frequency symbol sebolic addressing obtaining descending pilot frequency symbol
Number set；
Wherein, step 502 specifically can be accomplished by:
Descending pilot frequency symbol sebolic addressing, according to MUB matrix, is weighted obtaining descending pilot frequency glossary of symbols by signal transmitting equipment
Closing, computing formula is as follows:
Wherein,The descending pilot frequency mapped for the l pilot resources of i-th antenna port in the s subframe
Symbol, XlFor the l descending pilot frequency symbol in descending pilot frequency symbol sebolic addressing,For l+ in the s MUB matrix in MUB code book
The element of 1 row i+1 row, l is more than or equal to 0 and less than NTNatural number, i is more than or equal to 0 and less than NTNatural number.
503, within the pilot weighted cycle, signal is launched equipment and is sent descending pilot frequency assemble of symbol on all antennas；
In the present embodiment, signal launches each antenna port of equipment corresponding N in each pilot tone subframeTIndividual transmission money
Source, each transfer resource can serve as pilot resources, can send a descending pilot frequency symbol on each transfer resource.Letter
Number launching equipment obtains after descending pilot frequency assemble of symbol, and descending pilot frequency symbol therein can be respectively mapped to pilot tone money
Source.Descending pilot frequency assemble of symbol, in the way of framing transmission, is sent to signal receiver by signal transmitting equipment.Each descending
The descending pilot frequency symbol that pilot tone subframe comprises may be considered a subset of descending pilot frequency assemble of symbol.
It is understood that in a pilot tone subframe, signal launches equipment can send N by all antennasT×NTIndividual
Descending pilot frequency symbol.If the pilot weighted cycle comprises S pilot tone subframe, then signal launches the descending pilot frequency glossary of symbols that equipment sends
In conjunction, descending pilot frequency symbol quantity is NT×NT× S, S are 0 to NTBetween integer.
For example, when signal transmitting equipment has 4 antenna port, Fig. 6 (a) is the pilot tone that existing LTE standard specifies
Transmission mode, each antenna port is difference pilot symbol transmitted x0, x1, x2, x3 on orthogonal pilot resources.Fig. 6 (b) is this
The pilot tone of invention sends mode, and first row square represents R0, secondary series square represents R1, the 3rd row square represents R2, the 4th row side
Block represents R3.Each antenna port can send weighting on each pilot resources after frequency pilot sign, weights are with antenna end
Mouth serial number line order number, pilot resources serial number row sequence number, select corresponding element, i.e. from pilot weighted matrix
Send the subframe of pilot tone with tn,tn+1,tn+2... as a example by, for subframe tn+s, signal launches equipment can use Qs
Being weighted, specific as follows shown: on antenna port (Port), the mapping relations of pilot resources and descending pilot frequency symbol are such as
Shown in following table:
Above the pilot resources of the s subframe heaven line cap is described with the mapping relations of frequency pilot sign, under
In the face of frequency pilot sign mapping relations with pilot resources in pilot period are introduced, referring to Fig. 7, the first row square represents
R0, the second row square represents R1, the third line square represents R2, fourth line square represents R3.In subframe tnUse Q0Make pilot weighted,
In subframe tn+1Use Q1Make pilot weighted, in subframe tn+2Use Q2Make pilot weighted, be weighted successively, in subframeMake
WithMake pilot weighted.In above process, employ all matrix in code book and carry out taking turns time a length of pilot tone of weighting
The weighting cycle.It follows that in the next pilot weighted cycle, in subframeUse Q1Make pilot weighted, in subframeUse Q2Making pilot weighted, other subframes can the rest may be inferred, and here is omitted.It should be noted that pilot weighted
Matrix is not fixing corresponding relation with subframe weighting order, is not construed as limiting the most herein.
504, signal receiver launches, according to signal, the descending pilot frequency assemble of symbol that equipment sends, to transmission antenna array
Channel between receiving antenna array carries out channel estimation；
Signal launches equipment by sending N on each antenna port in each of the lower row pilot tone subframeTIndividual descending pilot frequency symbol,
Corresponding, signal receiver is by receiving N on each antenna port in each of the lower row pilot tone subframeTIndividual descending
Frequency pilot sign.It follows that in each of the lower in row pilot tone subframe, signal receiver can be received by all antenna ports
NT×NTIndividual descending pilot frequency symbol, then carries out channel estimation according to each descending pilot frequency subframe to the channel between antenna port,
A channel matrix, the i.e. channel estimation results of this pilot tone subframe can be obtained.When pilot period comprises S subframe, signal
The channel matrix group that reception equipment obtains can be expressed as H1, H2..., HS.Signal receiver is carried out according to descending pilot frequency symbol
The process of channel estimating is similar to prior art, and here is omitted.
It should be noted that in note prior art, transmission antenna array is H ' to the channel matrix of receiving antenna array, then
Channel matrix in the present embodiment is H with the relation of above-mentioned channel matrixs=H ' Qs。
505, signal receiver obtains pre-coding matrix instruction according to the channel estimation results of each pilot tone subframe respectively,
And the pre-coding matrix obtained in pilot period is indicated as pre-coding matrix instruction group；
Concrete, signal receiver can calculate pre-coding matrix according to channel matrix, and computing formula is as follows:
Wherein, wsIt is pre-coding matrix corresponding to the s subframe, wiFor i-th pre-coding matrix in precoding codebook, W is
Precoding codebook, HsIt is channel matrix corresponding to the s subframe,For HsConjugation symmetrical matrix,For wiConjugate pair
Claim matrix.
It should be noted that signal receiver obtains the process of pre-coding matrix instruction and existing skill according to channel matrix
Art is similar.
After obtaining pre-coding matrix, signal receiver may determine that the pre-coding matrix that pre-coding matrix is corresponding refers to
Show, and using obtain in pilot period precoding indicate as pre-coding matrix instruction group.Wherein, pilot period and above-mentioned pilot tone
The weighting cycle is corresponding, if pilot period comprises S pilot tone subframe, then pre-coding matrix instruction group comprises S precoding instruction.
It should be noted that the matrix used due to pilot weightedSeparate, so PMI amount every time
The error changed also is independent.
506, pre-coding matrix is indicated group to be sent to signal transmitting equipment by signal receiver；
507, signal launches equipment according to pre-coding matrix instruction group calculating reconstruct channel eigenvectors；
Step 507 specifically can be accomplished by:
Signal is launched equipment and is determined pre-coding matrix according to pre-coding matrix instruction group, according to pre-coding matrix group and
MUB matrix calculus reconstruct channel matrix, carries out singular value decomposition by reconstruct channel matrix, chooses eigenvalue of maximum characteristic of correspondence
Vector is as reconstruct channel eigenvectors.
Concrete, signal is launched equipment and is reconstructed channel matrix according to pre-coding matrix group and MUB matrix calculus, calculates public affairs
Formula is as follows:
Z (t) is the reconstruct channel matrix that the t subframe is corresponding, Qs(t-τ)It is MUB matrix corresponding to τ subframe of t-, wt-τ
Be τ subframe of t-corresponding pre-coding matrix instruction,For wt-τConjugation symmetrical matrix,For Qs(t-τ)Conjugation
Symmetrical matrix.
It should be noted that second equation shows to reconstruct between channel matrix and real channel characteristic vector in this step
Error relationship, specifically described below:
Wherein,
Due to esWithOrthogonal, ZveT () is 0；Error accumulation item ZeeSize (the N of (t) and pilot weighted code bookT+ 1) become
Inverse ratio, thereforeImpact on Z (t) is maximum.Z (t) is carried out singular value decomposition, obtains eigenvalue of maximum characteristic of correspondence
Vector V (t), the error between itself and the characteristic vector of real channel and (NT+ 1) it is inversely proportional to.
508, signal transmitting equipment carries out wave beam forming according to reconstruct channel eigenvectors to downlink data.
Signal launches the reconstruct channel eigenvectors that equipment utilization obtains, and calculates beam shape-endowing weight value, according to wave beam forming
Weights carry out wave beam forming to downlink data.It should be noted that this reconstruct channel eigenvectors can be also used for descending scheduling.
In the present embodiment, signal receiver can carry out the estimation of many secondary channels to down channel, obtains multiple channel square
Battle array, after signal transmitting equipment carries out channel reconstruction calculating to multiple channel matrixes, can make channel reconstruction with lower quantization error
Result is close to real channel, thus improves the precision of directional wave beam, reduces inter-user interference.
Optionally, in an embodiment of the application, MUB code book is Kerdock code book.
Concrete, when antenna amount is 2, MUB code book includes following MUB matrix:
When antenna amount is 4, MUB code book includes following MUB matrix:
The advantage of Kerdock code book is that it only comprises 0,1, these elements of-1, j ,-j, and memory space requirements is little, uses
This code book adds temporary, and pilot weighted computing overhead is little.
Optionally, in another embodiment of the application, transmission antenna array comprises 4 antennas, and MUB code book comprises
Matrix is as follows:
System emulation result shows, compared with Kerdock code book, this code book two users match under throughput performance more
Good.
The base station of 4 antenna ports typically configures two groups of cross-polarized antenna elements (element).3GPP Rel.8 is extremely
The design of the descending 4 antenna Rank=1 precoding codebooks of Rel.11 considers the channel characteristics under this antenna configurations, it is believed that right
In the array of two antenna elements (representative value is 1/2 wavelength) close together, channel coefficients between two antennas that polarised direction is identical
Dependency is higher, and the channel coefficients dependency between orthogonal two polarised direction antennas is relatively low.Referring to Fig. 8, Fig. 8 is 4
Antenna port, cross polarised antenna array schematic diagram, wherein, antenna 0 and antenna 2 intersect, and antenna 1 and antenna 3 intersect, antenna 0
Being same polarization antenna with antenna 1, antenna 2 and antenna 3 are same polarization antenna.Channel coefficients between two antennas that polarised direction is identical
Dependency is higher, and the channel coefficients dependency between orthogonal two polarised direction antennas is relatively low.Pre-at 4 antenna Rank=1
In coding code book, 12 code words are had to have a following structure:
Referring to following table, precoding codebook is for phase contrast α between same polarization antennaiQuantified precision, and to cross-pole
Phase difference beta between changeiQuantified precision different, the former minimum interval is π/4, and the latter minimum interval is pi/2.
In order to improve the quantified precision of phase contrast between cross polarised antenna, optionally, in another enforcement of the application
In example, the matrix that MUB code book includes is as follows:
Wherein, QkFor kth matrix in MUB code book,For kth Kerdock in the Kerdock code book that double antenna is corresponding
Matrix, 02×2The element that the matrix of expression 2 × 2 comprises is 0.
Concrete, use the code book of the present embodiment that channel is carried out linear transformation, be equivalent to have exchanged antenna port 1 and sky
The channel (antenna port is 0,1,2,3) of line cap 2, makes the α of PMI code bookiBecome quantifying from the channel quantifying same polarization antenna
The channel of cross polarised antenna, due to αiCompare βiQuantified precision higher, therefore can reduce channel estimation errors, thus improve
The accuracy that channel is estimated.
Optionally, in another embodiment of the application, MUB code book includes:
Wherein, QkFor kth matrix in MUB code book,It it is kth in the Kerdock code book that four antennas are corresponding
Kerdock matrix.
Concrete, use the code book of the present embodiment that channel is carried out linear transformation, with the code book using previous embodiment
Channel being carried out linear transformation similar, here is omitted.Compared with the code book of previous embodiment, the MUB that this code book comprises
Matrix is more, and signal receiver can obtain more channels estimated result, and therefore quantization error is less.
In actual applications, along with the translational speed of terminal is accelerated, the speed of channel variation can accelerate, if pilot weighted is all
Phase crosses over multiple channel coherency time, then measure gained channel estimation results substantial deviation within the pilot weighted cycle and truly believe
Road.In order to solve, translational speed is too fast causes channel estimation results distortion, the invention provides following methods:
Optionally, in another embodiment of the application, signal launch equipment obtain MUB code book specifically can by with
Under type realizes: signal is launched equipment and obtained the translational speed of signal receiver, determines the speed interval that translational speed is corresponding,
Matrix quantity is determined according to speed interval and default corresponding relation；Signal transmitting equipment is according to matrix quantity, from default code book
In choose MUB matrix and comprise N as MUB code book, default code bookT+ 1 MUB matrix.
Concrete, signal transmitting equipment can obtain the mobility information of signal receiver and (such as position information, open loop
Link circuit self-adapting information etc.), so that it is determined that its translational speed, determine matrix quantity further according to the speed interval that translational speed is corresponding
S, then chooses S matrix as MUB code book from default code book.Optionally, signal transmitting equipment can choose front S MUB
Matrix is as MUB code book.Accordingly, the length of PMI buffer queue can be revised as S, according to S PMI by signal transmitting equipment
And S MUB matrix calculus reconstruct channel matrix, computing formula is as follows:
It should be noted that speed is the fastest, matrix quantity S is the fewest；Speed is the slowest, and matrix quantity S is the most.
For example, speed interval can be as shown in the table with the corresponding relation of MUB code book:
| Speed interval | MUB code book |
| [0km/h,10km/h) | Q0、Q1、Q2、Q3、Q4 |
| [10km/h～20km/h) | Q0、Q1、Q2、Q3 |
| [20km/h～49km/h) | Q0、Q1、Q2 |
| [50km/h～120km/h] | Q0、Q1 |
It is understood that the corresponding relation of speed interval and MUB code book is not limited to above citing, do not limit
Fixed.
Above beam form-endowing method in the embodiment of the present invention is described, below to many days in the embodiment of the present invention
Line communication system is introduced, and refers to Fig. 9, and this multiple antenna communication includes that signal launches equipment and signal receives and sets
Standby, this signal launches equipment and signal receiver has the function realizing embodiment illustrated in fig. 5 or alternative embodiment.
Signal is launched equipment and is included: aerial array 901, processor 902, memorizer 903 and bus；Aerial array 901, place
It is connected with each other communication by bus between reason device 902 and memorizer 903, wherein, refers to by calling the operation of memorizer 903 storage
Order, processor 902 is used for performing following method:
Obtain descending pilot frequency symbol sebolic addressing and MUB code book；According to MUB code book, descending pilot frequency symbol sebolic addressing is added
Power obtains descending pilot frequency assemble of symbol；Within the pilot weighted cycle, send descending pilot frequency assemble of symbol on all antennas, with
Signal receiver is made to obtain pre-coding matrix instruction group according to descending pilot frequency assemble of symbol, wherein, by each antenna end
Mouth sends N in each pilot tone subframeTIndividual descending pilot frequency symbol；Receive the pre-coding matrix instruction that signal receiver sends
Group, calculates reconstruct channel eigenvectors according to pre-coding matrix instruction group, enters downlink data according to reconstruct channel eigenvectors
Row wave beam forming.
Optionally, in one embodiment of the invention, processor 902 is specifically for according to MUB code book, to descending pilot frequency
Symbol sebolic addressing is weighted obtaining descending pilot frequency assemble of symbol, and computing formula is as follows:
Wherein,The descending pilot frequency symbol mapped for the l antenna port i-th pilot resources in the s subframe
Number, XlFor the l descending pilot frequency symbol in descending pilot frequency symbol sebolic addressing,For l+1 in the s MUB matrix in MUB code book
The element of row i+1 row, l is more than or equal to 0 and less than NTNatural number, i is more than or equal to 0 and less than NTNatural number.
Optionally, in one embodiment of the invention, processor 902 is specifically for true according to pre-coding matrix instruction group
Determine pre-coding matrix group, reconstruct channel matrix according to pre-coding matrix group and MUB matrix calculus, reconstruct channel matrix is carried out
Singular value decomposition, choose eigenvalue of maximum characteristic of correspondence vector as reconstruct channel eigenvectors, wherein, calculate reconstruct channel
The formula of matrix is as follows:
Wherein, Z (t) is the reconstruct channel matrix that the t subframe is corresponding, Qs(t-τ)It is MUB square corresponding to τ subframe of t-
Battle array, wt-τBe τ subframe of t-corresponding pre-coding matrix instruction,For wt-τConjugation symmetrical matrix,For Qs(t-τ)
Conjugation symmetrical matrix.
Optionally, in one embodiment of the invention, MUB code book is Kerdock code book.
Optionally, in one embodiment of the invention, aerial array comprises 4 antennas, and MUB code book includes:
Optionally, in one embodiment of the invention, aerial array 901 comprises at least two group cross polarised antennas,
MUB code book includes:
Wherein, QkFor kth matrix in MUB code book,For kth Kerdock in the Kerdock code book that double antenna is corresponding
Matrix, 02×2The element that the matrix of expression 2 × 2 comprises is 0.
Optionally, in one embodiment of the invention, aerial array 901 comprises at least two group cross polarised antennas, MUB
Matrix includes:
Wherein, QkFor kth matrix in MUB code book,It it is kth in the Kerdock code book that four antennas are corresponding
Kerdock matrix.
Optionally, in one embodiment of the invention, processor 902 is specifically for obtaining the movement of signal receiver
Speed, determines the speed interval that translational speed is corresponding, determines matrix quantity according to speed interval and default corresponding relation, according to
Matrix quantity is chosen MUB matrix from default code book and is comprised N as MUB code book, default code bookT+ 1 MUB matrix.
Signal receiver includes:
Aerial array 904, processor 905, memorizer 906 and bus；Aerial array 904, processor 905 and memorizer
Being connected with each other communication by bus between 906, wherein, by calling the operational order of memorizer 906 storage, processor 905 is used
In performing following method:
According to signal launch equipment send descending pilot frequency assemble of symbol, to transmission antenna array to receiving antenna array it
Between channel carry out channel estimation, wherein, by receiving N on each antenna port in each of the lower row pilot tone subframeTIndividual descending lead
Frequency symbol；Obtain pre-coding matrix instruction according to the channel estimation results of each pilot tone subframe respectively, and obtain in pilot period
The pre-coding matrix obtained indicates as pre-coding matrix instruction group；Pre-coding matrix indicates group be sent to signal and launches equipment,
So that signal is launched equipment and calculated reconstruct channel eigenvectors according to pre-coding matrix instruction group, and according to reconstruct channel characteristics
Vector carries out wave beam forming to downlink data.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method are permissible
Realize by another way.Such as, device embodiment described above is only schematically, such as, and described unit
Dividing, be only a kind of logic function and divide, actual can have other dividing mode, the most multiple unit or assembly when realizing
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or
The coupling each other discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit
Close or communication connection, can be electrical, machinery or other form.
The above, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to front
State embodiment the present invention has been described in detail, it will be understood by those within the art that: it still can be to front
State the technical scheme described in each embodiment to modify, or wherein portion of techniques feature is carried out equivalent；And these
Amendment or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (18)
1. being applied to a beam form-endowing method for multiple antenna communication, in described multiple antenna communication, signal launches equipment
Being respectively provided with aerial array with signal receiver, aerial array comprises NTIndividual antenna, it is characterised in that described method includes:
Signal is launched equipment and is obtained descending pilot frequency symbol sebolic addressing and mutual unbiased base MUB code book；
Described descending pilot frequency symbol sebolic addressing, according to described MUB code book, is weighted obtaining descending leading by described signal transmitting equipment
Frequency symbol set；
Within the pilot weighted cycle, described signal is launched equipment and is sent described descending pilot frequency assemble of symbol on all antennas, with
Described signal receiver is made to obtain pre-coding matrix instruction group, wherein, described letter according to described descending pilot frequency assemble of symbol
Number launch equipment in each pilot tone subframe, send N by each antenna portTIndividual descending pilot frequency symbol；
Described signal is launched equipment and is received the pre-coding matrix instruction group that described signal receiver sends, according to described precoding
Matrix instruction group calculates reconstruct channel eigenvectors, according to described reconstruct channel eigenvectors, downlink data is carried out wave beam tax
Shape.
Method the most according to claim 1, it is characterised in that at described signal transmitting equipment according to described MUB code book, right
During described descending pilot frequency symbol sebolic addressing is weighted obtaining descending pilot frequency assemble of symbol, computing formula is as follows:
Wherein,The descending pilot frequency symbol mapped for the l pilot resources of i-th antenna port in the s subframe, Xl
For the l descending pilot frequency symbol in described descending pilot frequency symbol sebolic addressing,For in the s MUB matrix in described MUB code book
The element of l+1 row i+1 row, l is more than or equal to 0 and less than NTNatural number, i is more than or equal to 0 and less than NTNatural number.
Method the most according to claim 1, it is characterised in that described signal is launched equipment and referred to according to described pre-coding matrix
Show that group calculates reconstruct channel eigenvectors, including:
Described signal is launched equipment and is determined pre-coding matrix group according to pre-coding matrix instruction group；
Described signal is launched equipment and is reconstructed channel matrix, computing formula according to pre-coding matrix group and described MUB matrix calculus
As follows:
Wherein, Z (t) is the reconstruct channel matrix that the t subframe is corresponding, Qs(t-τ)It is MUB matrix corresponding to τ subframe of t-,
wt-τIt is pre-coding matrix corresponding to τ subframe of t-,For wt-τConjugation symmetrical matrix,For Qs(t-τ)Conjugation
Symmetrical matrix；
Described signal is launched equipment and described reconstruct channel matrix is carried out singular value decomposition, chooses eigenvalue of maximum characteristic of correspondence
Vector is as reconstruct channel eigenvectors.
The most according to the method in any one of claims 1 to 3, it is characterised in that described MUB code book is Kerdock code book.
The most according to the method in any one of claims 1 to 3, it is characterised in that described aerial array comprises 4 antennas,
Described MUB code book includes:
The most according to the method in any one of claims 1 to 3, it is characterised in that described aerial array comprises at least two groups
Cross polarised antenna, described MUB code book includes:
Wherein, QkFor kth matrix in described MUB code book, describedFor kth in the Kerdock code book that double antenna is corresponding
Kerdock matrix, 02×2The element that the matrix of expression 2 × 2 comprises is 0.
The most according to the method in any one of claims 1 to 3, it is characterised in that described aerial array comprises at least two groups
Cross polarised antenna, described MUB matrix includes:
Wherein, QkFor kth matrix in described MUB code book,It it is kth Kerdock in the Kerdock code book that four antennas are corresponding
Matrix.
The most according to the method in any one of claims 1 to 3, it is characterised in that described signal is launched equipment and obtained MUB code
Originally include:
Described signal is launched equipment and is obtained the translational speed of described signal receiver, determines the speed that described translational speed is corresponding
Interval, determines matrix quantity according to described speed interval and default corresponding relation；
Described signal launches equipment according to described matrix quantity, chooses MUB matrix as MUB code book from default code book, described
Default code book comprises NT+ 1 MUB matrix.
9. being applied to a beam form-endowing method for multiple antenna communication, in described multiple antenna communication, signal launches equipment
Being respectively provided with aerial array with signal receiver, aerial array comprises NTIndividual antenna, it is characterised in that including:
Signal receiver launches, according to signal, the descending pilot frequency assemble of symbol that equipment sends, to transmission antenna array to receiving sky
Channel between linear array carries out channel estimation, and described signal receiver is by each antenna port row pilot tone in each of the lower
N is received on frameTIndividual descending pilot frequency symbol；
Described signal receiver obtains pre-coding matrix instruction according to the channel estimation results of each pilot tone subframe respectively, and will
The pre-coding matrix obtained in pilot period indicates as pre-coding matrix instruction group；
Described pre-coding matrix instruction group is sent to described signal and launches equipment by described signal receiver, so that described letter
Number launch equipment according to described pre-coding matrix instruction group calculate reconstruct channel eigenvectors, and according to reconstruct channel eigenvectors
Downlink data is carried out wave beam forming.
10. a signal launches equipment, it is characterised in that including:
Aerial array, processor, memorizer and bus；Bus is passed through mutual between described aerial array, processor and memorizer
Connecting communication, described aerial array includes NTIndividual antenna, wherein, by calling the operational order of described memorizer storage, described
Processor is used for performing following method:
Obtain descending pilot frequency symbol sebolic addressing and mutual unbiased base MUB code book；
According to described MUB code book, it is weighted obtaining descending pilot frequency assemble of symbol to described descending pilot frequency symbol sebolic addressing；
Within the pilot weighted cycle, send described descending pilot frequency assemble of symbol on all antennas, so that described signal receives
Equipment obtains pre-coding matrix instruction group according to described descending pilot frequency assemble of symbol, wherein, by each antenna port each
N is sent in pilot tone subframeTIndividual descending pilot frequency symbol；
Receive the pre-coding matrix instruction group that described signal receiver sends, calculate weight according to described pre-coding matrix instruction group
Structure channel eigenvectors, carries out wave beam forming according to described reconstruct channel eigenvectors to downlink data.
11. signals according to claim 10 launch equipment, it is characterised in that described processor is specifically for according to described
MUB code book, is weighted obtaining descending pilot frequency assemble of symbol to described descending pilot frequency symbol sebolic addressing, and computing formula is as follows:
Wherein,The descending pilot frequency symbol mapped for the l pilot resources of i-th antenna port in the s subframe, Xl
For the l descending pilot frequency symbol in described descending pilot frequency symbol sebolic addressing,For in the s MUB matrix in described MUB code book
The element of l+1 row i+1 row, l is more than or equal to 0 and less than NTNatural number, i is more than or equal to 0 and less than NTNatural number.
12. signals according to claim 10 launch equipment, it is characterised in that described processor is specifically for according to prelisting
Code matrix instruction group determines pre-coding matrix group, reconstructs channel matrix according to pre-coding matrix group and described MUB matrix calculus,
Described reconstruct channel matrix is carried out singular value decomposition, chooses eigenvalue of maximum characteristic of correspondence vector as reconstruct channel characteristics
Vector, wherein, the formula calculating reconstruct channel matrix is as follows:
Wherein, Z (t) is the reconstruct channel matrix that the t subframe is corresponding, Qs(t-τ)It is MUB matrix corresponding to τ subframe of t-,
wt-τIt is pre-coding matrix corresponding to τ subframe of t-,For wt-τConjugation symmetrical matrix,For Qs(t-τ)Conjugation
Symmetrical matrix.
13. launch equipment according to the signal according to any one of claim 10 to 12, it is characterised in that described MUB code book is
Kerdock code book.
14. launch equipment according to the signal according to any one of claim 10 to 12, it is characterised in that described aerial array bag
Containing 4 antennas, described MUB code book includes:
15. launch equipment according to the signal according to any one of claim 10 to 12, it is characterised in that described aerial array bag
Containing at least two group cross polarised antennas, described MUB code book includes:
Wherein, QkFor kth matrix in described MUB code book, describedFor kth in the Kerdock code book that double antenna is corresponding
Kerdock matrix, 02×2The element that the matrix of expression 2 × 2 comprises is 0.
16. launch equipment according to the signal according to any one of claim 10 to 12, it is characterised in that described aerial array bag
Containing at least two group cross polarised antennas, described MUB matrix includes:
Wherein, QkFor kth matrix in described MUB code book,It it is kth in the Kerdock code book that four antennas are corresponding
Kerdock matrix.
17. launch equipment according to the signal according to any one of claim 10 to 12, it is characterised in that described processor is concrete
For obtaining the translational speed of described signal receiver, determine the speed interval that described translational speed is corresponding, according to described speed
Spend interval and default corresponding relation and determine matrix quantity, from default code book, choose MUB matrix according to described matrix quantity and make
For MUB code book, described default code book comprises NT+ 1 MUB matrix.
18. 1 kinds of signal receivers, it is characterised in that including:
Aerial array, processor, memorizer and bus；Bus is passed through mutual between described aerial array, processor and memorizer
Connecting communication, described aerial array includes NTIndividual antenna, wherein, by calling the operational order of described memorizer storage, described
Processor is used for performing following method:
The descending pilot frequency assemble of symbol that equipment sends is launched, between transmission antenna array to receiving antenna array according to signal
Channel carries out channel estimation, wherein, by receiving N on each antenna port in each of the lower row pilot tone subframeTIndividual descending pilot frequency accords with
Number；
Pre-coding matrix instruction is obtained respectively according to the channel estimation results of each pilot tone subframe, and by acquisition in pilot period
Pre-coding matrix indicates as pre-coding matrix instruction group；
Described pre-coding matrix instruction group is sent to described signal and launches equipment, so that described signal launches equipment according to institute
State pre-coding matrix instruction group and calculate reconstruct channel eigenvectors, and according to reconstruct channel eigenvectors, downlink data is carried out ripple
Bundle figuration.
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| PCT/CN2017/071714 WO2017206527A1 (en) | 2016-05-30 | 2017-01-19 | Beam-forming method, signal transmitter and signal receiver |
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| WO2017206527A1 (en) * | 2016-05-30 | 2017-12-07 | 华为技术有限公司 | Beam-forming method, signal transmitter and signal receiver |
| CN109845154A (en) * | 2017-01-03 | 2019-06-04 | 华为技术有限公司 | Communication means, base station and terminal device |
| CN113328769A (en) * | 2020-02-28 | 2021-08-31 | 上海华为技术有限公司 | Data processing method and apparatus thereof |
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| CN112118035B (en) * | 2019-06-21 | 2023-09-26 | 中兴通讯股份有限公司 | Method and device for realizing beam forming |
| CN111917671B (en) * | 2020-08-07 | 2023-11-14 | 北京信息科技大学 | Apparatus and method for wireless communication |
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