The content of the invention
The present invention provides a kind of method and apparatus of signal processing, is done to solve existing in the prior art mitigate at presentThe scheme disturbed is unable to lifting system capacity and Signal to Interference plus Noise Ratio, and can not be suppressed or coordinated for co-frequency cell farther outProblem.
The embodiment of the present invention provides a kind of method of signal processing, and this method includes：
Determine the matrix of the statistical property for representing interference source；
To determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, obtaining interference source justHand over complementary space matrix；
According to the orthogonal complement space matrix of the interference source, the estimate of received signal is normalized.
It is preferred that determine the matrix of the statistical property for representing interference source, including：
Determine the channel estimation value of cell；
According to the channel estimation value, the matrix of the statistical property for representing interference source is determined.
It is preferred that before the matrix for determining the statistical property for representing interference source, further include：
Determine to receive signal.
It is preferred that to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, doneThe orthogonal complement space matrix in source is disturbed, including：
Decomposed using Eigenvalues Decomposition or singular value SVD, to the statistical property that is used to described in determining represent interference sourceMatrix carries out matrix decomposition, obtains the orthogonal complement space matrix of interference source.
It is preferred that the estimate of received signal is normalized according to following equation：
Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is that the channel of cell is estimatedEvaluation.
The embodiment of the present invention provides a kind of equipment of signal processing, including：
First determining module, for determining the matrix of the statistical property for representing interference source；
Second determining module, for being used to described in determining representing the matrix of the statistical property of interference source into row matrix pointSolution, obtains the orthogonal complement space matrix of interference source；
Normalize module, for the orthogonal complement space matrix according to the interference source, to the estimate of received signal intoRow normalized.
It is preferred that first determining module is specifically used for：
Determine the channel estimation value of cell；According to the channel estimation value, the statistical property for representing interference source is determinedMatrix.
It is preferred that first determining module is additionally operable to：
Upon receipt of the signals, the matrix of the statistical property for representing interference source is determined.
It is preferred that second determining module is specifically used for：
Decomposed using Eigenvalues Decomposition or singular value SVD, to the statistical property that is used to described in determining represent interference sourceMatrix carries out matrix decomposition, obtains the orthogonal complement space matrix of interference source.
It is preferred that the normalization module is specifically used for, the estimate of received signal is returned according to following equationOne change is handled：
Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is that the channel of cell is estimatedEvaluation.
The embodiment of the present invention to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, obtainTo the orthogonal complement space matrix of interference source；According to the orthogonal complement space matrix of the interference source, to the estimate of received signalIt is normalized；And the embodiment of the present invention is based on signal subspace theory, is disturbed and/or made an uproar by matrix decompositionThe orthogonal complement space of sound, so as to form zero limit in interference radiating way, and forms equivalent wave beam in desired signal direction, can greatlyImprove the Signal to Interference plus Noise Ratio of desired signal.
Embodiment
The embodiment of the present invention to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, obtainTo the orthogonal complement space matrix of interference source；According to the orthogonal complement space matrix of the interference source, to the estimate of received signalIt is normalized.
Theory of the embodiment of the present invention based on subspace, constructs the orthogonal complement space matrix of interference source, in the sky of interference sourceBetween it is upper form zero limit, wave beam is formed in desired signal space, so as to achieve the purpose that to suppress interference.Due to being not required to；And thisIt is theoretical that inventive embodiments are based on signal subspace, is disturbed by matrix decomposition and/or the orthogonal complement space of noise, so thatInterference radiating way forms zero limit, and equivalent wave beam is formed in desired signal direction, and the letter that can greatly improve desired signal dry is made an uproarThan.
Wherein, the interference source of the embodiment of the present invention can be noise；Can also be noise and interference, interference here includesBut it is not limited to：There is the signal source of same characteristic features, such as LTE signals etc., the letter different from interference source statistical property with interference sourceNumber source, such as burst pulse etc..
The embodiment of the present invention is described in further detail with reference to Figure of description.
As shown in Figure 1, the method for one signal processing of the embodiment of the present invention includes：
Step 101, the matrix for determining statistical property for representing interference source；
Step 102, to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, doneDisturb the orthogonal complement space matrix in source；
Step 103, the orthogonal complement space matrix according to the interference source, are normalized the estimate of received signalProcessing.
Wherein, the executive agent of the method for the embodiment of the present invention can be network side equipment or user equipment.
The network side equipment of the embodiment of the present invention can be base station（Such as macro base station, micro-base station, Home eNodeB etc.）, also may be usedTo be RN（Relaying）Equipment, can also be other network side equipments
If network side equipment, then the signal received is uplink signal；
If user equipment, the signal received is downlink signal.
The embodiment of the present invention upon receipt of the signals, can perform the matrix for determining the statistical property for representing interference sourceThe step of.
It is preferred that in the matrix for determining the statistical property for representing interference source, it can first determine that the channel of cell is estimatedEvaluation；Then according to the channel estimation value, the matrix of the statistical property for representing interference source is determined.
Specifically, when determining the channel estimation value of cell, LS or the Wiener filtering algorithm of complexity can be used to obtain.Here cell is one in the cell of multiple area interferences, for example executive agent is UE（User equipment）, then cell be exactlyThe cell of UE access；
If executive agent is network side equipment, cell is exactly the cell for the UE access for sending uplink signal.
Wherein, the matrix for being used to represent the statistical property of interference source of the embodiment of the present invention can be covariance matrix；Can be autocorrelation matrix, cross-correlation matrix, second moment etc.
In force, the embodiment of the present invention can use direct or indirect method to determine the statistics spy for representing interference sourceThe matrix of property.
Direct method refers to the channel estimation value H for obtaining interfered cell or user equipmenti（If executive agent is networkSide apparatus, then that obtain is the channel estimation value δ of interfered cell2；If executive agent is user equipment, that obtain is userThe channel estimation value of equipment）, and noise power, then according to channel estimation value and noise power, determine to be used to represent interferenceThe matrix Φ of the statistical property in source, such as using formula one；
Round-about way refers to the channel estimation value using interfered cell or user equipment（If executive agent is networkSide apparatus, then what is obtained is the channel estimation value of interfered cell；If executive agent is user equipment, what is obtained is that user setsStandby channel estimation value）, the desired signal of this cell or user equipment is reconstructed, and by its estimate from received signalSubtract r-HiSi, further calculate the matrix Φ that can obtain the statistical property for representing interference source；Wherein r is the letter receivedNumber estimate, HiSiFor this cell or the desired signal of user equipment.
It is preferred that during using direct method, statistical property for representing interference source can be determined according to formula oneMatrix：
... ... formula one；
Wherein, E is expressed as the desired value of signal；I is unit matrix；N is noise, and it is that 0 variance is δ to obey average2AnswerGaussian Profile,Represent the performance number of j-th of interference；J is the subscript value of all interference sources（index）；I is expectation cell markKnow, i cannot be equal to j, but i is the subset of j；H is expressed as channel estimate matrix；HjFor the channel estimation value of j-th of cell；K isThe total quantity of interference source；SjFor the transmission signal of j-th of cell.
It is preferred that to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, doneWhen disturbing the orthogonal complement space matrix in source, Eigenvalues Decomposition or SVD can be used（Singular value）Decompose, to determine described in be used for tableShow that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source, that is, obtain characteristic valueFor 0 feature vector wH, wHΦ w=0 or wHΦw→0。
It is preferred that according to the orthogonal complement space matrix of the interference source, the estimate of received signal is normalizedDuring processing, the estimate of received signal can be normalized according to formula two：
... ... formula two；
Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is that the channel of cell is estimatedEvaluation.
The embodiment of the present invention is based on signal subspace theory, and the orthogonal complement space of interference source is obtained by matrix decomposition, fromAnd zero limit is formed in interference radiating way, and wave beam is formed in desired signal direction, the SINR of desired signal can greatly be improved.
As shown in Fig. 2, the method for binary signal of embodiment of the present invention processing includes：
Step 201, receive signal；
Step 202, the channel estimation value for determining cell；
Step 203, according to the channel estimation value, determine the matrix of the statistical property for representing interference source；
Step 204, to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, doneDisturb the orthogonal complement space matrix in source；
Step 205, the orthogonal complement space matrix according to the interference source, are normalized the estimate of received signalProcessing.
Based on same inventive concept, a kind of equipment of signal processing is additionally provided in the embodiment of the present invention, due to the equipmentThe principle solved the problems, such as is similar to the method for signal processing of the embodiment of the present invention, therefore the implementation of the equipment may refer to methodImplement, overlaps will not be repeated.
As shown in figure 3, the equipment of three signal processing of the embodiment of the present invention includes：
First determining module 300, for determining the matrix of the statistical property for representing interference source；
Second determining module 310, for determine described in be used for represent interference source statistical property matrix carry out squareBattle array is decomposed, and obtains the orthogonal complement space matrix of interference source；
Module 320 is normalized, for the orthogonal complement space matrix according to the interference source, to the estimate of received signalIt is normalized.
It is preferred that first determining module 300 is specifically used for：
Determine the channel estimation value of cell；According to the channel estimation value, the statistical property for representing interference source is determinedMatrix.
It is preferred that first determining module 300 is additionally operable to：
Upon receipt of the signals, the matrix of the statistical property for representing interference source is determined.
It is preferred that second determining module 310 is specifically used for：
Decomposed using Eigenvalues Decomposition or SVD, to be used to described in determining representing the matrix of the statistical property of interference source intoRow matrix is decomposed, and obtains the orthogonal complement space matrix of interference source.
It is preferred that the normalization module 320 is specifically used for, the estimate of received signal is carried out according to following equationNormalized：
Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is that the channel of cell is estimatedEvaluation.
As shown in figure 4, the equipment of four signal processing of the embodiment of the present invention includes：
Processor 400, for determining the matrix of the statistical property for representing interference source；To determine described in be used for representThe matrix of the statistical property of interference source carries out matrix decomposition, obtains the orthogonal complement space matrix of interference source；According to the interference sourceOrthogonal complement space matrix, the estimate by 410 received signal of transceiver is normalized；
Transceiver 410, for data to be received and sent under the control of processor 400.
It is preferred that processor 400 is specifically used for：
Determine the channel estimation value of cell；According to the channel estimation value, the statistical property for representing interference source is determinedMatrix.
It is preferred that processor 400 is additionally operable to：
After signal is received by transceiver 410, the matrix of the statistical property for representing interference source is determined.
It is preferred that processor 400 is specifically used for：
Decomposed using Eigenvalues Decomposition or SVD, to be used to described in determining representing the matrix of the statistical property of interference source intoRow matrix is decomposed, and obtains the orthogonal complement space matrix of interference source.
It is preferred that processor 400 is specifically used for, place is normalized to the estimate of received signal according to following equationReason：
Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is that the channel of cell is estimatedEvaluation.
Wherein, in Fig. 4, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor 400The various circuits for the memory that the one or more processors and memory 420 of representative represent link together.Bus architecture is alsoVarious other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like can be linked together, these are allIt is it is known in the art, therefore, no longer it is described further herein.Bus interface provides interface.Transceiver 410 canTo be multiple element, i.e., including transmitter and receiver, there is provided for the list with various other equipment communications over a transmission mediumMember.Processor 400 is responsible for bus architecture and common processing, and memory 420 can store processor 400 and perform operationWhen used data.
Processor 400 is responsible for bus architecture and common processing, and memory 420 can store processor 400 and holdUsed data during row operation.
It can be seen from the above：Theory of the embodiment of the present invention based on subspace, constructs the orthogonal short covering of interference sourceBetween matrix, limited in the spatially formation zero of interference source, wave beam formed in desired signal space, thus reach suppress interference mesh's；And it is theoretical that the embodiment of the present invention is based on signal subspace, disturbed by matrix decomposition and/or the orthogonal short covering of noiseBetween, so as to form zero limit in interference radiating way, and equivalent wave beam is formed in desired signal direction, desired signal can greatly be improvedSignal to Interference plus Noise Ratio.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer programProduct.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardwareApply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or moreUsable storage medium（Including but not limited to magnetic disk storage, CD-ROM, optical memory etc.）The computer program production of upper implementationThe form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, equipment（System）And the flow of computer program productFigure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagramThe combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be providedThe processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produceA raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in factThe equipment for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spyDetermine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring toMake the manufacture of equipment, the commander equipment realize in one flow of flow chart or multiple flows and/or one square frame of block diagram orThe function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that countedSeries of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer orThe instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram oneThe step of function of being specified in a square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creationProperty concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellentSelect embodiment and fall 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 artGod and scope.In this way, if these modifications and changes of the present invention belongs to the scope of the claims in the present invention and its equivalent technologiesWithin, then the present invention is also intended to comprising including these modification and variations.