CN105812044B - A kind of dual-stream beamforming method and device - Google Patents
A kind of dual-stream beamforming method and device Download PDFInfo
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- CN105812044B CN105812044B CN201410855885.3A CN201410855885A CN105812044B CN 105812044 B CN105812044 B CN 105812044B CN 201410855885 A CN201410855885 A CN 201410855885A CN 105812044 B CN105812044 B CN 105812044B
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- 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
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Abstract
The invention discloses a kind of dual-stream beamforming method and devices.Its method includes: to carry out Eigenvalues Decomposition to the channel correlation matrix of ascending pilot frequency, obtains the corresponding feature vector of maximum eigenvalue, and determine corresponding first forming coefficient of each antenna respectively according to it；The angle of arrival computing array response vector obtained using estimation；According to array response vector, the second figuration vector is determined, and according to the second figuration vector, determine corresponding second forming coefficient of each antenna respectively；On each antenna, wave beam forming is carried out using the first data flow that its corresponding first beamformin coefficient opposite direction user equipment is sent, carries out wave beam forming using the second data flow that the opposite user equipment of its corresponding second beamformin coefficient is sent.Estimate angle of arrival, according to angle of arrival computing array response vector, and then obtains figuration vector, operand and computational complexity and obtain time corresponding feature vector of big characteristic value well below to channel correlation matrix progress Eigenvalues Decomposition.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of dual-stream beamforming method and devices.
Background technique
Wave beam forming makes wave beam have pointing clearly to property, can increase coverage distance, improves signal quality, and raising penetrates
The ability of building, and the handling capacity of Cell Edge User can be increased, to be widely used.
Existing dual-stream beamforming scheme obtains channel matrix as uplink channel estimation using ascending pilot frequency, according to
The channel matrix calculating channel correlation matrix arrived carries out Eigenvalues Decomposition to channel correlation matrix, and decomposition obtains maximum and secondary big
The corresponding two groups of feature vectors of characteristic value, used on the transmitting antenna of base station the conjugation of this two groups of feature vectors as figuration to
Amount realizes dual-stream beamforming.
Existing dual-stream beamforming scheme, two groups of feature vectors of characteristics of needs value decomposition computation obtain figuration vector,
Computational complexity is higher.In addition, ascending pilot frequency is sent with an antenna since user equipment is fixed, channel correlation matrix
The corresponding feature vector of secondary big characteristic value cannot be matched with actual channel condition, cause to carry out wave using obtained figuration vector
The performance of beam figuration is poor.
Summary of the invention
The object of the present invention is to provide a kind of dual-stream beamforming method and devices, to solve existing dual-stream beamforming
The problem that computational complexity is high, performance is poor.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of dual-stream beamforming method, comprising:
Eigenvalues Decomposition is carried out to the channel correlation matrix of ascending pilot frequency, obtains the corresponding feature vector of maximum eigenvalue；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively；
The angle of arrival computing array response vector obtained using estimation, the angle of arrival are estimated according to the ascending pilot frequency
It obtains；
According to the array response vector, the second figuration vector is determined, and according to the second figuration vector, determine respectively
Corresponding second forming coefficient of each antenna；
On each antenna, the first data flow of its corresponding first beamformin coefficient opposite direction user equipment transmission is used
Wave beam forming is carried out, is carried out using the second data flow that the opposite user equipment of its corresponding second beamformin coefficient is sent
Wave beam forming.
Preferably, determining the second figuration vector according to the array response vector, comprising:
Array response vector feature vector corresponding with the maximum eigenvalue is orthogonalized processing, obtains
Two figuration vectors.
Preferably, determining that each antenna corresponding first is assigned respectively according to the corresponding feature vector of the maximum eigenvalue
Shape coefficient, comprising:
According to the power factor in the corresponding feature vector of the maximum eigenvalue and each antenna being calculated, respectively
Determine that corresponding first forming coefficient of each antenna, the power factor make the transmission power on every antenna be no more than system
Limit power；
According to the second figuration vector, corresponding second forming coefficient of each antenna is determined respectively, comprising:
According to power factor described in the second figuration vector sum, each antenna corresponding second figuration system is determined respectively
Number.
Preferably, this method further include:
Calculate separately the transmitting total work for sending the first data flow and the second data flow on every antenna to the user equipment
Rate；
Power factor thereon is determined according to the total emission power on every antenna respectively.
Preferably, determining corresponding second forming coefficient of each antenna respectively according to the second figuration vector, comprising:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, each antenna corresponding second figuration system is determined respectively
Number.
Based on above-mentioned any means embodiment, preferably, the channel correlation matrix to ascending pilot frequency carries out Eigenvalues Decomposition,
Obtain the corresponding feature vector of maximum eigenvalue, comprising: to channel correlation matrix of the ascending pilot frequency on each subband respectively into
Row Eigenvalues Decomposition obtains the corresponding feature vector of maximum eigenvalue on each subband；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively,
It include: to determine each antenna in each subband respectively according to the corresponding feature vector of maximum eigenvalue on each subband
Upper corresponding first forming coefficient；
The angle of arrival computing array response vector obtained using estimation, comprising: on each subband obtained using estimation
Angle of arrival calculates separately the array response vector on each subband；
According to the array response vector, the second figuration vector is determined, and according to the second figuration vector, determine respectively
Corresponding second forming coefficient of each antenna, comprising: according to the array response vector on each subband, determine each subband respectively
On the second figuration vector determine each antenna each from taking respectively and according to the second figuration vector on each subband
Corresponding second forming coefficient；
On each antenna, the first data flow of its corresponding first beamformin coefficient opposite direction user equipment transmission is used
Wave beam forming is carried out, is carried out using the second data flow that the opposite user equipment of its corresponding second beamformin coefficient is sent
Wave beam forming, comprising: on each antenna, using its on each subband corresponding first beamformin coefficient respectively to each
On subband to user equipment send the first data flow carry out wave beam forming, using it on each subband corresponding second wave beam
Forming coefficient carries out wave beam forming to the second data flow sent on each subband to user equipment respectively.
Based on inventive concept same as method, the embodiment of the present invention also provides a kind of dual-stream beamforming device, comprising:
First figuration vector generation module carries out Eigenvalues Decomposition for the channel correlation matrix to ascending pilot frequency, obtains
The corresponding feature vector of maximum eigenvalue；According to the corresponding feature vector of the maximum eigenvalue, each antenna pair is determined respectively
The first forming coefficient answered；
Second figuration vector generation module, the angle of arrival computing array response vector for being obtained using estimation are described to arrive
It up to angle is estimated according to the ascending pilot frequency；According to the array response vector, the second figuration vector is determined, and according to
The second figuration vector determines corresponding second forming coefficient of each antenna respectively；
Wave beam forming module, for being set using its corresponding first beamformin coefficient opposite direction user in each antenna
The first data flow that preparation is sent carries out wave beam forming, is sent out using the opposite user equipment of its corresponding second beamformin coefficient
The second data flow sent carries out wave beam forming.
Preferably, when determining the second figuration vector, the second figuration vector generates mould according to the array response vector
Block is used for:
Array response vector feature vector corresponding with the maximum eigenvalue is orthogonalized processing, obtains
Two figuration vectors.
Preferably, determining that each antenna corresponding first is assigned respectively according to the corresponding feature vector of the maximum eigenvalue
When shape coefficient, the first figuration vector generation module is used for: according to the corresponding feature vector of the maximum eigenvalue and calculating
The obtained power factor on each antenna determines that corresponding first forming coefficient of each antenna, the power factor make respectively
It obtains the transmission power on every antenna and is no more than system limitation power；
According to the second figuration vector, when determining corresponding second forming coefficient of each antenna respectively, described second is assigned
Shape vector generation module is used for: according to power factor described in the second figuration vector sum, determining that each antenna is corresponding respectively
Second forming coefficient.
Preferably, further including power factor determining module, it is used for:
Calculate separately the transmitting total work for sending the first data flow and the second data flow on every antenna to the user equipment
Rate；
Power factor thereon is determined according to the total emission power on every antenna respectively.
It is described when determining corresponding second forming coefficient of each antenna respectively preferably, according to the second figuration vector
Second figuration vector generation module is used for:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, each antenna corresponding second figuration system is determined respectively
Number.
Based on above-mentioned any device embodiment, preferably, the first figuration vector generation module is used for: to ascending pilot frequency
Channel correlation matrix on each subband carries out Eigenvalues Decomposition respectively, and the maximum eigenvalue obtained on each subband is corresponding
Feature vector；According to the corresponding feature vector of maximum eigenvalue on each subband, determine each antenna each respectively
Corresponding first forming coefficient on subband；
The second figuration vector generation module is used for: the angle of arrival on each subband obtained using estimation is calculated separately
Array response vector on each subband；According to the array response vector on each subband, on each subband is determined respectively
Two figuration vectors, and according to the second figuration vector on each subband, determine each antenna each corresponding from taking respectively
Second forming coefficient；
The wave beam forming module is used for: in each antenna, using it, corresponding first wave beam is assigned on each subband
Shape coefficient carries out wave beam forming to the first data flow sent on each subband to user equipment respectively, using it in each subband
Upper corresponding second beamformin coefficient carries out wave beam tax to the second data flow sent on each subband to user equipment respectively
Shape.
Based on inventive concept same as method, the embodiment of the present invention also provides a kind of base station, comprising:
Processor executes following process for reading the program in memory:
Eigenvalues Decomposition is carried out to the channel correlation matrix of ascending pilot frequency, obtains the corresponding feature vector of maximum eigenvalue；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively；
The angle of arrival computing array response vector obtained using estimation, the angle of arrival are estimated according to the ascending pilot frequency
It obtains；According to the array response vector, the second figuration vector is determined, and according to the second figuration vector, determine respectively
Corresponding second forming coefficient of each antenna；
On each antenna, sent to by transceiver to user equipment using its corresponding first beamformin coefficient
First data flow carries out wave beam forming, using its corresponding second beamformin coefficient to by transceiver to the user equipment
The second data flow sent carries out wave beam forming；
Transceiver, for sending and receiving data under the control of a processor；
Memory is executing the data used when operation for saving processor.
Preferably, when determining the second figuration vector, processor reads the journey in memory according to the array response vector
Sequence executes following process:
Array response vector feature vector corresponding with the maximum eigenvalue is orthogonalized processing, obtains
Two figuration vectors.
Preferably, determining that each antenna corresponding first is assigned respectively according to the corresponding feature vector of the maximum eigenvalue
When shape coefficient, processor read memory in program, execute following process: according to the corresponding feature of the maximum eigenvalue to
The power factor on each antenna measured and be calculated, determines corresponding first forming coefficient of each antenna, the function respectively
The rate factor makes the transmission power on every antenna be no more than system limitation power；
According to the second figuration vector, when determining corresponding second forming coefficient of each antenna respectively, processor is read
Program in memory executes following process: according to power factor described in the second figuration vector sum, determining each day respectively
Corresponding second forming coefficient of line.
Preferably, processor also reads the program in memory, following process is executed:
Calculate separately the transmitting total work for sending the first data flow and the second data flow on every antenna to the user equipment
Rate；
Power factor thereon is determined according to the total emission power on every antenna respectively.
Preferably, according to the second figuration vector, when determining corresponding second forming coefficient of each antenna respectively, processing
Device reads the program in memory, executes following process:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, each antenna corresponding second figuration system is determined respectively
Number.
Following process is executed preferably, processor reads the program in memory based on above-mentioned any device embodiment:
Eigenvalues Decomposition is carried out to channel correlation matrix of the ascending pilot frequency on each subband respectively, is obtained on each subband
The corresponding feature vector of maximum eigenvalue；According to the corresponding feature vector of maximum eigenvalue on each subband, respectively
Determine each antenna corresponding first forming coefficient on each subband；
The angle of arrival on each subband obtained using estimation calculates separately the array response vector on each subband；According to
Array response vector on each subband determines the second figuration vector on each subband respectively, and according on each subband
Second figuration vector determines that each antenna takes corresponding second forming coefficient each certainly respectively；
On each antenna, using its on each subband corresponding first beamformin coefficient respectively on each subband
To user equipment send the first data flow carry out wave beam forming, using it on each subband corresponding second wave beam forming system
Number carries out wave beam forming to the second data flow sent on each subband to user equipment respectively.
Detailed description of the invention
Fig. 1 is dual-stream beamforming method flow diagram provided by one embodiment of the present invention；
Fig. 2 is the dual-stream beamforming method flow diagram that another embodiment of the present invention provides；
Fig. 3 is dual-stream beamforming schematic device provided in an embodiment of the present invention；
Fig. 4 is architecture of base station schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical solution provided in an embodiment of the present invention is described in detail.
Dual-stream beamforming method provided in an embodiment of the present invention is as shown in Figure 1, specifically include following operation:
Step 100 carries out Eigenvalues Decomposition to the channel correlation matrix of ascending pilot frequency, obtains the corresponding spy of maximum eigenvalue
Levy vector.
Wherein, the corresponding feature vector of the maximum eigenvalue obtained is norm normalizing.
Specifically, estimating channel matrix H first with ascending pilot frequency, channel correlation matrix R=H is calculatedHH；To channel phase
It closes matrix R and carries out Eigenvalues Decomposition, obtain the corresponding feature vector of maximum eigenvalue.
Step 110, according to the corresponding feature vector of above-mentioned maximum eigenvalue, determine that each antenna corresponding first is assigned respectively
Shape coefficient.
Step 120, angle of arrival (DOA) the computing array response vector obtained using estimation.
Assuming that the DOA that estimation obtains is θ, array response vector Vtmp,2Can with but be not limited only to calculate by following formula
It arrives:
Wherein, NtFor the transmitting antenna number of base station, d is antenna spacing, and λ is the wavelength of signal.
Step 130, according to above-mentioned array response vector, determine the second figuration vector, and according to the second figuration vector, point
Corresponding second forming coefficient of each antenna is not determined.
Step 140, on each antenna, sent using its corresponding first beamformin coefficient opposite direction user equipment the
One data flow carries out wave beam forming, the second data sent using the opposite user equipment of its corresponding second beamformin coefficient
Stream carries out wave beam forming.
In the embodiment of the present invention, " first " and " second " is only used for distinguishing the two data streams sent to user equipment.
Technical solution provided in an embodiment of the present invention, the figuration vector of a data flow according further to ascending pilot frequency channel
The corresponding feature vector of the maximum eigenvalue of correlation matrix obtains, and the figuration vector of another data flow is calculated according to angle of arrival
To array response vector obtain.On the one hand, estimate angle of arrival, according to angle of arrival computing array response vector, and then assigned
Shape vector, operand and computational complexity obtain time big characteristic value well below to channel correlation matrix progress Eigenvalues Decomposition
Corresponding feature vector.On the other hand, the angle of arrival estimated can the actual channel condition of fuzzy matching, therefore, according to
The performance that the figuration vector that angle of arrival is calculated carries out wave beam forming gets a promotion.
In above-mentioned treatment process, to avoid interfering with each other between the first data flow and the second data flow, it is preferred that will be upper
State array response vector Vtmp,2Feature vector V corresponding with above-mentioned maximum eigenvalue1It is orthogonalized processing, obtains the second figuration
Vector V2.It can with but be not limited only to realize by following formula:
In above-mentioned treatment process, for the transmitting function for making the first data flow using the first figuration vector progress wave beam forming
Rate is not exceeded, it is preferred that is according to the corresponding spy of above-mentioned maximum eigenvalue when determining corresponding first forming coefficient of each antenna
The power factor on each antenna that sign vector sum is calculated, determines corresponding first forming coefficient of each antenna, function respectively
The rate factor makes the transmission power on every antenna be no more than system limitation power.
Assuming that the transmitting antenna number of base station is Nt, the corresponding first forming coefficient W of n-th antenna1,nIt can be expressed as W1,n
=V1,nρn.Wherein, n=1,2 ... ..., Nt, V1,nIt is corresponding for n-th antenna in the corresponding feature vector of above-mentioned maximum eigenvalue
Component, ρnFor the power factor on n-th antenna.
In above-mentioned treatment process, for the transmitting function for making the second data flow using the second figuration vector progress wave beam forming
Rate is not exceeded, it is preferred that when determining corresponding second forming coefficient of each antenna, according to the above-mentioned above-mentioned function of second figuration vector sum
The rate factor determines corresponding second forming coefficient of each antenna respectively.
Assuming that the transmitting antenna number of base station is Nt, the corresponding second forming coefficient W of n-th antenna2,nIt can be expressed as W2,n
=V2,nρn.Wherein, n=1,2 ... ..., Nt, V2,nFor the corresponding component of n-th antenna, ρ in the second figuration vectornFor n-th day
Power factor on line.
Wherein, the power factor on every antenna is only used for determining corresponding first forming coefficient of this antenna and the second figuration
Coefficient.
In above-mentioned treatment process, before determining corresponding first forming coefficient of each antenna and the second forming coefficient, also
It may include the step of calculating power factor: calculating separately and send the first data flow and the to above-mentioned user equipment on every antenna
The total emission power of two data flows；Power factor thereon is determined according to the total emission power on every antenna respectively.
Wherein, the total emission power P of the first data flow and the second data flow is sent on n-th antenna to user equipmentnIt can
With but be not limited only to be calculated by following formula:
Pn=∑ | Vi|2
Wherein, i=1,2.
Power factor on n-th antenna can with but be not limited only to be calculated by following formula:
It should be pointed out that the present invention illustrates the calculation of power factor only with preferred embodiment, but be not excluded for using
Other calculations obtain power factor, such as calculate the figuration vector maximum transmission power on all antennas, and then calculate function
The rate factor guarantees that maximum transmission power is no more than system and limits power.
Power in order to guarantee two data streams is identical, it is preferred that carries out norm normalization to above-mentioned second figuration vector
Processing；According to the second figuration vector after norm normalized, the corresponding second figuration vector of each antenna is determined respectively.Such as
Fruit considers the limitation of transmission power, specifically according to the function on each antenna of the second figuration vector sum after norm normalized
The rate factor determines corresponding second forming coefficient of each antenna respectively.
Wherein it is possible to but be not limited only to carry out norm normalized to the second figuration vector by following formula:
Above-mentioned treatment process can be realized on the full bandwidth of Antenna Operation.In order to further decrease computational complexity,
Above-mentioned treatment process can be realized according to certain forming granularity molecular band.Correspondingly, above-mentioned process flow can be described as:
Eigenvalues Decomposition is carried out to channel correlation matrix of the ascending pilot frequency on each subband respectively, is obtained on each subband
The corresponding feature vector of maximum eigenvalue；
According to the corresponding feature vector of maximum eigenvalue on above-mentioned each subband, determine each antenna in every height respectively
Take corresponding first forming coefficient；
The angle of arrival on each subband obtained using estimation calculates separately the array response vector on each subband；
According to the array response vector on each subband, the second figuration vector on each subband is determined respectively, and according to
The second figuration vector on each subband determines that each antenna takes corresponding second forming coefficient each certainly respectively；
On each antenna, using its on each subband corresponding first beamformin coefficient respectively on each subband
To user equipment send the first data flow carry out wave beam forming, using it on each subband corresponding second wave beam forming system
Number carries out wave beam forming to the second data flow sent on each subband to user equipment respectively.
Wherein, subband is divided according to determining forming granularity.
It should be pointed out that the implementation that can cooperate between each preferred embodiment of aforementioned present invention, to form
New embodiment.
Below with long term evolution (LTE) system base-station 4+4 dual polarized antenna, for the scene that antenna number is 8, to the present invention
The dual-stream beamforming method that embodiment provides is described in detail.Its process flow is as shown in Fig. 2, specifically include following behaviour
Make:
Step 200 is done up channel with uplink detection reference signal (Sounding Reference Signal, SRS) and is estimated
Meter, obtains each sub-carrier channels estimated matrix Hi(i=1,2 ..., 6*NPRB)。
Wherein, HiDimension be 1*8, NPRBFor Physical Resource Block shared by ascending pilot frequency (PRB) number, provided according to agreement
SRS is that pectination is placed, and the subcarrier number that SRS is accounted in a PRB is 6.
It should be pointed out that the present embodiment is only illustrated by taking uplink SRS as an example, other ascending pilot frequencies can also be used for this hair
It is bright.
Step 210, to HiIt is extracted, the third sub-carrier channels estimated value of each PRB is taken to obtain Hj(j=1,
2,...,NPRB), dimension 1*8.
Step 220 utilizes HjObtain each PRB channel correlation matrixDimension is 8*8, with nPRBIt (need to be whole
Number) it is granularity to RjAveragely obtainedM=1,2 ..., NPRB/nPRB。
It is step 230, rightIt carries out Eigenvalues Decomposition and obtains the corresponding feature vector V of maximum eigenvalue1,m, dimension 1*8.
Step 240 estimates DOA (being set as θ) using DOA algorithm for estimating, and computing array response vector
Wherein, NtFor the transmitting antenna number (being equal to 8) of base station, d is antenna spacing (for example, 0.65 times of wavelength), and λ is wave
It is long.
Step 250, by V1,mAnd Vtmp,2,mProcessing is orthogonalized to obtain:
Step 260, by V2,mNorm normalized is carried out to obtain:
Step 270, V1,mAnd V2,mCombine the processing for taking phase, completes power protection processing.
That is: the total emission power for sending two data streams in single antenna to user equipment is calculated, according to the transmitting total work
Rate calculates power factor, and then obtains the W on every antenna1And W2.Its specific implementation is referred to retouching for above-described embodiment
It states, details are not described herein again.
Based on inventive concept same as method, the embodiment of the present invention also provides a kind of dual-stream beamforming device, such as Fig. 3
It is shown, it specifically includes:
First figuration vector generation module 301 carries out Eigenvalues Decomposition for the channel correlation matrix to ascending pilot frequency, obtains
To the corresponding feature vector of maximum eigenvalue；According to the corresponding feature vector of the maximum eigenvalue, each antenna is determined respectively
Corresponding first forming coefficient；
Second figuration vector generation module 302, the angle of arrival computing array response vector for being obtained using estimation are described
Angle of arrival is estimated according to the ascending pilot frequency；According to the array response vector, the second figuration vector, and root are determined
According to the second figuration vector, corresponding second forming coefficient of each antenna is determined respectively；
Wave beam forming module 303, for using its corresponding first beamformin coefficient opposite direction user in each antenna
The first data flow that equipment is sent carries out wave beam forming, uses the opposite user equipment of its corresponding second beamformin coefficient
The second data flow sent carries out wave beam forming.
Preferably, according to the array response vector, when determining the second figuration vector, the second figuration vector generates mould
Block is used for:
Array response vector feature vector corresponding with the maximum eigenvalue is orthogonalized processing, obtains
Two forming coefficients.
Based on above-mentioned any device embodiment, it is preferred that true respectively according to the corresponding feature vector of the maximum eigenvalue
When corresponding first forming coefficient of fixed each antenna, the first figuration vector generation module is used for: according to the maximum feature
The power factor being worth on corresponding feature vector and each antenna being calculated determines that each antenna corresponding first is assigned respectively
Shape coefficient, the power factor make the transmission power on every antenna be no more than system limitation power.
Based on above-mentioned any device embodiment, it is preferred that according to the second figuration vector, determine each antenna pair respectively
When the second forming coefficient answered, the second figuration vector generation module is used for: according to function described in the second figuration vector sum
The rate factor determines corresponding second forming coefficient of each antenna respectively.
Preferably, further include power factor determining module, be used for:
Calculate separately the transmitting total work for sending the first data flow and the second data flow on every antenna to the user equipment
Rate；
Power factor thereon is determined according to the total emission power on every antenna respectively.
Based on above-mentioned any device embodiment, it is preferred that according to the second figuration vector, determine each antenna pair respectively
When the second forming coefficient answered, the second figuration vector generation module is used for:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, each antenna corresponding second figuration system is determined respectively
Number.
Based on above-mentioned any device embodiment, it is preferred that the first figuration vector generation module is used for: to ascending pilot frequency
Channel correlation matrix on each subband carries out Eigenvalues Decomposition respectively, and the maximum eigenvalue obtained on each subband is corresponding
Feature vector；According in the corresponding feature vector of maximum eigenvalue on each subband and each antenna being calculated
Power factor determines each antenna corresponding first forming coefficient on each subband respectively；
The second figuration vector generation module is used for: the angle of arrival on each subband obtained using estimation is calculated separately
Array response vector on each subband；According to the array response vector on each subband, on each subband is determined respectively
Two figuration vectors, and according to the power factor on each antenna of the second figuration vector sum on each subband, it determines respectively
Each antenna takes corresponding second forming coefficient each certainly；
The wave beam forming module is used for: in each antenna, using it, corresponding first wave beam is assigned on each subband
Shape coefficient carries out wave beam forming to the first data flow sent on each subband to user equipment respectively, using it in each subband
Upper corresponding second beamformin coefficient carries out wave beam tax to the second data flow sent on each subband to user equipment respectively
Shape.
Based on inventive concept same as method, the embodiment of the present invention also provides a kind of base station, as shown in figure 4, specific packet
It includes:
Processor 400 executes following process for reading the program in memory 420:
Eigenvalues Decomposition is carried out to the channel correlation matrix of ascending pilot frequency, obtains the corresponding feature vector of maximum eigenvalue；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively；Utilize estimation
Obtained angle of arrival computing array response vector, the angle of arrival are estimated according to the ascending pilot frequency；According to described
Array response vector determines the second figuration vector, and according to the second figuration vector, determines each antenna corresponding respectively
Two forming coefficients；Through transceiver 410 on each antenna, its corresponding first wave beam forming vector opposite direction user equipment is used
The first data flow sent carries out wave beam forming, is sent using the opposite user equipment of its corresponding second wave beam forming vector
The second data flow carry out wave beam forming
Transceiver 410, for sending and receiving data under the control of processor 400.
Wherein, in Fig. 4, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor 400
The various circuits for the memory that the one or more processors and memory 420 of representative represent link together.Bus architecture is also
Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can be linked together, these are all
It is it is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 410 can
To be multiple element, that is, includes transmitter and receiver, the list for communicating over a transmission medium with various other devices is provided
Member.Processor 400, which is responsible for management bus architecture and common processing, memory 420, can store processor 400 and is executing operation
When used data.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of dual-stream beamforming method characterized by comprising
Eigenvalues Decomposition is carried out to the channel correlation matrix of ascending pilot frequency, obtains the corresponding feature vector of maximum eigenvalue；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively；
The angle of arrival computing array response vector obtained using estimation, the angle of arrival is to estimate to obtain according to the ascending pilot frequency
's；
According to the array response vector, the second figuration vector is determined, and according to the second figuration vector, determine each respectively
Corresponding second forming coefficient of antenna；
On each antenna, carried out using the first data flow that its corresponding first beamformin coefficient opposite direction user equipment is sent
Wave beam forming carries out wave beam using the second data flow that the opposite user equipment of its corresponding second beamformin coefficient is sent
Figuration；
Wherein, according to the array response vector, determine the second figuration vector, comprising: by the array response vector with it is described
The corresponding feature vector of maximum eigenvalue is orthogonalized processing, obtains the second figuration vector.
2. the method according to claim 1, wherein being divided according to the corresponding feature vector of the maximum eigenvalue
Corresponding first forming coefficient of each antenna is not determined, comprising:
According to the power factor in the corresponding feature vector of the maximum eigenvalue and each antenna being calculated, determine respectively
Corresponding first forming coefficient of each antenna, the power factor limit the transmission power on every antenna no more than system
Power；
According to the second figuration vector, corresponding second forming coefficient of each antenna is determined respectively, comprising:
According to power factor described in the second figuration vector sum, corresponding second forming coefficient of each antenna is determined respectively.
3. according to the method described in claim 2, it is characterized in that, this method further include:
Calculate separately the total emission power for sending the first data flow and the second data flow on every antenna to the user equipment；
Power factor thereon is determined according to the total emission power on every antenna respectively.
4. the method according to claim 1, wherein determining each day respectively according to the second figuration vector
Corresponding second forming coefficient of line, comprising:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, corresponding second forming coefficient of each antenna is determined respectively.
5. method according to any one of claims 1 to 4, which is characterized in that the channel correlation matrix of ascending pilot frequency into
Row Eigenvalues Decomposition obtains the corresponding feature vector of maximum eigenvalue, comprising: to channel phase of the ascending pilot frequency on each subband
It closes matrix and carries out Eigenvalues Decomposition respectively, obtain the corresponding feature vector of maximum eigenvalue on each subband；
According to the corresponding feature vector of the maximum eigenvalue, corresponding first forming coefficient of each antenna is determined respectively, comprising:
According to the corresponding feature vector of maximum eigenvalue on each subband, determine that each antenna is corresponding on each subband respectively
The first forming coefficient；
The angle of arrival computing array response vector obtained using estimation, comprising: the arrival on each subband obtained using estimation
Angle calculates separately the array response vector on each subband；
According to the array response vector, the second figuration vector is determined, and according to the second figuration vector, determine each respectively
Corresponding second forming coefficient of antenna, comprising: according to the array response vector on each subband, determined on each subband respectively
Second figuration vector, and according to the second figuration vector on each subband, determine that each antenna takes correspondence each certainly respectively
The second forming coefficient；
On each antenna, carried out using the first data flow that its corresponding first beamformin coefficient opposite direction user equipment is sent
Wave beam forming carries out wave beam using the second data flow that the opposite user equipment of its corresponding second beamformin coefficient is sent
Figuration, comprising: on each antenna, using its on each subband corresponding first beamformin coefficient respectively to each subband
On to user equipment send the first data flow carry out wave beam forming, using it on each subband corresponding second wave beam forming
Coefficient carries out wave beam forming to the second data flow sent on each subband to user equipment respectively.
6. a kind of dual-stream beamforming device characterized by comprising
First figuration vector generation module carries out Eigenvalues Decomposition for the channel correlation matrix to ascending pilot frequency, obtains maximum
The corresponding feature vector of characteristic value；According to the corresponding feature vector of the maximum eigenvalue, determine that each antenna is corresponding respectively
First forming coefficient；
Second figuration vector generation module, the angle of arrival computing array response vector for being obtained using estimation, the angle of arrival
It is to be estimated according to the ascending pilot frequency；According to the array response vector, the second figuration vector is determined, and according to described
Second figuration vector determines corresponding second forming coefficient of each antenna respectively；
Wave beam forming module, for being sent out using its corresponding first beamformin coefficient opposite direction user equipment in each antenna
The first data flow sent carries out wave beam forming, is sent using the opposite user equipment of its corresponding second beamformin coefficient
Second data flow carries out wave beam forming；
Wherein, according to the array response vector, when determining the second figuration vector, the second figuration vector generation module is used
In: array response vector feature vector corresponding with the maximum eigenvalue is orthogonalized processing, obtains the second tax
Shape vector.
7. device according to claim 6, which is characterized in that according to the corresponding feature vector of the maximum eigenvalue, divide
When not determining corresponding first forming coefficient of each antenna, the first figuration vector generation module is used for: according to the maximum
Power factor on the corresponding feature vector of characteristic value and each antenna being calculated determines each antenna corresponding the respectively
One forming coefficient, the power factor make the transmission power on every antenna be no more than system limitation power；
According to the second figuration vector, when determining corresponding second forming coefficient of each antenna respectively, second figuration to
Amount generation module is used for: according to power factor described in the second figuration vector sum, determining each antenna corresponding second respectively
Forming coefficient.
8. device according to claim 7, which is characterized in that further include power factor determining module, be used for:
Calculate separately the total emission power for sending the first data flow and the second data flow on every antenna to the user equipment；
Power factor thereon is determined according to the total emission power on every antenna respectively.
9. device according to claim 6, which is characterized in that according to the second figuration vector, determine each day respectively
When corresponding second forming coefficient of line, the second figuration vector generation module is used for:
Norm normalized is carried out to the second figuration vector；
According to the second figuration vector after norm normalized, corresponding second forming coefficient of each antenna is determined respectively.
10. according to the described in any item devices of claim 6~9, which is characterized in that the first figuration vector generation module is used
In: Eigenvalues Decomposition is carried out to channel correlation matrix of the ascending pilot frequency on each subband respectively, is obtained on each subband most
The corresponding feature vector of big characteristic value；According to the corresponding feature vector of maximum eigenvalue on each subband, determine respectively
Each antenna corresponding first forming coefficient on each subband；
The second figuration vector generation module is used for: the angle of arrival on each subband obtained using estimation calculates separately each
Array response vector on subband；According to the array response vector on each subband, determine that second on each subband is assigned respectively
Shape vector, and according to the second figuration vector on each subband, determine that each antenna takes corresponding second each certainly respectively
Forming coefficient；
The wave beam forming module is used for: in each antenna, using it on each subband corresponding first wave beam forming system
Number respectively on each subband to user equipment send the first data flow carry out wave beam forming, using its on each subband it is right
The second beamformin coefficient answered carries out wave beam forming to the second data flow sent on each subband to user equipment respectively.
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| PCT/CN2015/093796 WO2016107279A1 (en) | 2014-12-31 | 2015-11-04 | Dual-current beam-forming method and device |
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