CN104836633B - A kind of method and apparatus of signal processing - Google Patents
A kind of method and apparatus of signal processing Download PDFInfo
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- CN104836633B CN104836633B CN201410049168.1A CN201410049168A CN104836633B CN 104836633 B CN104836633 B CN 104836633B CN 201410049168 A CN201410049168 A CN 201410049168A CN 104836633 B CN104836633 B CN 104836633B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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Abstract
The present embodiments relate to wireless communication technology field, more particularly to a kind of method and apparatus of signal processing, the problem of lifting system capacity and Signal to Interference plus Noise Ratio being unable to solve the scheme existing in the prior art for mitigating interference at present, and can not being suppressed or be coordinated for co-frequency cell farther out.The method of the embodiment of the present invention 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, obtain the orthogonal complement space matrix of interference source；According to the orthogonal complement space matrix of the interference source, the estimate of received signal is normalized.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of method and apparatus of signal processing.
Background technology
LTE（Long Term Evolution, Long Term Evolution）Be between the same intra-cell users of system it is orthogonal, therefore
Disturb co-channel interference caused by the user for being mainly derived from other cells and channeling.In being studied early stage LTE, enumerate
Various once considered inter-cell interference mitigation techniques, mainly include：
Inter-cell interference is randomized（Inter-Cell Interference Randomization）Assisted with inter-cell interference
Adjust/avoid（Inter-Cell Interference Coordination/avoidance）.
The basic thought of inter-cell interference randomized technique is that interference signal is converted into random white noise, common means
Including scrambling, interweaving, frequency hopping etc.；
The basic thought for Inter-Cell Interference Coordination/avoid is the resource point passed through in mutually coordinated method to each cell
Avoid causing strong jamming to neighbor cell as far as possible to reach with being limited.
At system networking initial stage, since user and cell are all fewer, it is all noise limited system that interference signal, which can wait,
But with the expansion of network size and the increase of user, people having a common goal caused by the interference and channeling between user equipment does
Disturbing to play a leading role.
Inter-cell interference randomization is by the means such as scrambling, intertexture, frequency hopping, although interference signal can be converted into white noise
Sound, but jamming power is not lowered, therefore will not lifting system capacity and Signal to Interference plus Noise Ratio（SINR).
Inter-Cell Interference Coordination/avoid technology by the resource allocation to each cell, transmit power etc. limited come
The interference of minizone is avoided or mitigates, but as the increase of number of user equipment, the complexity of scheduling exponentially increase,
In addition in the case where scheduling resource is limited it is difficult to ensure that between different districts resources for user equipment it is orthogonal, the interference of minizone is also
It is inevitable, and the technology is also merely able to carry out interference coordination for the several cells closed on, it is small for same frequency farther out
Area can not be suppressed or be coordinated.
In conclusion the scheme for mitigating interference at present is unable to lifting system capacity and Signal to Interference plus Noise Ratio, and for farther out
Co-frequency cell can not be suppressed or be coordinated.
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 present
The 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 out
Problem.
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 just
Hand 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, done
The 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 source
Matrix 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 estimated
Evaluation.
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 point
Solution, 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 into
Row 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 determined
Matrix.
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 source
Matrix 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 equation
One 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 estimated
Evaluation.
The embodiment of the present invention to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, obtain
To the orthogonal complement space matrix of interference source；According to the orthogonal complement space matrix of the interference source, to the estimate of received signal
It is normalized；And the embodiment of the present invention is based on signal subspace theory, is disturbed and/or made an uproar by matrix decomposition
The 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 greatly
Improve the Signal to Interference plus Noise Ratio of desired signal.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram of one signal processing of the embodiment of the present invention；
Fig. 2 is the method flow schematic diagram of binary signal of embodiment of the present invention processing；
Fig. 3 is the device structure schematic diagram of three signal processing of the embodiment of the present invention；
Fig. 4 is the device structure schematic diagram of four signal processing of the embodiment of the present invention.
Embodiment
The embodiment of the present invention to determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, obtain
To the orthogonal complement space matrix of interference source；According to the orthogonal complement space matrix of the interference source, to the estimate of received signal
It 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 source
Between 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 this
It is theoretical that inventive embodiments are based on signal subspace, is disturbed by matrix decomposition and/or the orthogonal complement space of noise, so that
Interference 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 uproar
Than.
Wherein, the interference source of the embodiment of the present invention can be noise；Can also be noise and interference, interference here includes
But 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 source
Number 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, done
Disturb 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 signal
Processing.
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 used
To 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 source
The 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 estimated
Evaluation；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 exactly
The 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 source
The matrix of property.
Direct method refers to the channel estimation value H for obtaining interfered cell or user equipmenti（If executive agent is network
Side apparatus, then that obtain is the channel estimation value δ of interfered cell2；If executive agent is user equipment, that obtain is user
The channel estimation value of equipment）, and noise power, then according to channel estimation value and noise power, determine to be used to represent interference
The 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 network
Side 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 sets
Standby channel estimation value）, the desired signal of this cell or user equipment is reconstructed, and by its estimate from received signal
Subtract r-HiSi, further calculate the matrix Φ that can obtain the statistical property for representing interference source；Wherein r is the letter received
Number 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 one
Matrix：
... ... 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 average2Answer
Gaussian Profile,Represent the performance number of j-th of interference；J is the subscript value of all interference sources（index）；I is expectation cell mark
Know, 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 is
The 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, done
When 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 table
Show 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 value
For 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 normalized
During 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 estimated
Evaluation.
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, from
And 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, done
Disturb 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 signal
Processing.
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 equipment
The 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 method
Implement, 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 square
Battle 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 signal
It 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 determined
Matrix.
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 into
Row 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 equation
Normalized：
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 estimated
Evaluation.
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 represent
The 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 source
Orthogonal 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 determined
Matrix.
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 into
Row 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 equation
Reason：
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 estimated
Evaluation.
Wherein, in Fig. 4, bus architecture can 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 ancillary 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, no longer it is described further herein.Bus interface provides interface.Transceiver 410 can
To be multiple element, i.e., including transmitter and receiver, there is provided for the list with various other equipment communications over a transmission medium
Member.Processor 400 is responsible for bus architecture and common processing, and memory 420 can store processor 400 and perform operation
When used data.
Processor 400 is responsible for bus architecture and common processing, and memory 420 can store processor 400 and hold
Used 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 source
Between 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 noise
Between, 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 improved
Signal 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 program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
Usable storage medium（Including but not limited to magnetic disk storage, CD-ROM, optical memory etc.）The computer program production of upper implementation
The 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 product
Figure 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 diagram
The 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 provided
The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact
The 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 spy
Determine 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 to
Make 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 or
The 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 counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The 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 one
The 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 creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
Select 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 art
God 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 technologies
Within, then the present invention is also intended to comprising including these modification and variations.
Claims (10)
- A kind of 1. method of signal processing, it is characterised in that 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, obtain the orthocomplement, orthogonal complement of interference source Space matrix；According to the orthogonal complement space matrix of the interference source, the estimate of received signal is normalized.
- 2. the method as described in claim 1, it is characterised in that determine the matrix of the statistical property for representing interference source, wrap Include：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.
- 3. method as claimed in claim 1 or 2, it is characterised in that determine the matrix of the statistical property for representing interference source Before, further include：Determine to receive signal.
- 4. method as claimed in claim 1 or 2, it is characterised in that to being used to represent that the statistics of interference source is special described in determining Property matrix carry out matrix decomposition, obtain the orthogonal complement space matrix of interference source, including：Decomposed using Eigenvalues Decomposition or singular value SVD, to being used for the matrix for representing the statistical property of interference source described in determining Matrix decomposition is carried out, obtains the orthogonal complement space matrix of interference source.
- 5. method as claimed in claim 2, it is characterised in that returned according to following equation to the estimate of received signal One change is handled：<mrow> <msub> <mover> <mi>S</mi> <mo>~</mo> </mover> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <mi>w</mi> <mi>H</mi> </msup> <mi>r</mi> </mrow> <mrow> <msup> <mi>w</mi> <mi>H</mi> </msup> <msub> <mi>H</mi> <mi>i</mi> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is the channel estimation of cell Value.
- 6. a kind of equipment of signal processing, it is characterised in that the equipment includes：First determining module, for determining the matrix of the statistical property for representing interference source；Second determining module, for determine described in be used for represent interference source statistical property matrix carry out matrix decomposition, Obtain the orthogonal complement space matrix of interference source；Module is normalized, for the orthogonal complement space matrix according to the interference source, the estimate of received signal is returned One change is handled.
- 7. equipment as claimed in claim 6, it is characterised in that first determining module is specifically used for：Determine the channel estimation value of cell；According to the channel estimation value, the square of the statistical property for representing interference source is determined Battle array.
- 8. equipment as claimed in claims 6 or 7, it is characterised in 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.
- 9. equipment as claimed in claims 6 or 7, it is characterised in that second determining module is specifically used for：Decomposed using Eigenvalues Decomposition or singular value SVD, to being used for the matrix for representing the statistical property of interference source described in determining Matrix decomposition is carried out, obtains the orthogonal complement space matrix of interference source.
- 10. equipment as claimed in claim 7, it is characterised in that the normalization module is specifically used for, according to following equation pair The estimate of received signal is normalized：<mrow> <msub> <mover> <mi>S</mi> <mo>~</mo> </mover> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <mi>w</mi> <mi>H</mi> </msup> <mi>r</mi> </mrow> <mrow> <msup> <mi>w</mi> <mi>H</mi> </msup> <msub> <mi>H</mi> <mi>i</mi> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>Wherein, wHIt is the orthogonal complement space matrix of interference source；R is the estimate of received signal；HiIt is the channel estimation of cell Value.
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| CN1593030A (en) * | 2001-10-02 | 2005-03-09 | 张量通讯公司 | Interference cancellation in a signal |
| CN101436893A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | Beam size enlargement apparatus and method for restraining interference of intelligent antenna |
| CN102393525A (en) * | 2011-10-28 | 2012-03-28 | 西安电子科技大学 | Navigation interference suppression and signal amplification method for subspace projection |
| CN102970256A (en) * | 2012-11-26 | 2013-03-13 | 清华大学 | Zero-space-based interference elimination method for multi-antenna device-to-device (D2D) communication system |
| CN102984100A (en) * | 2012-12-07 | 2013-03-20 | 汕头大学 | Multi-cell zero-forcing interference suppression method |
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|---|---|---|---|---|
| CN1593030A (en) * | 2001-10-02 | 2005-03-09 | 张量通讯公司 | Interference cancellation in a signal |
| CN101436893A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | Beam size enlargement apparatus and method for restraining interference of intelligent antenna |
| CN102393525A (en) * | 2011-10-28 | 2012-03-28 | 西安电子科技大学 | Navigation interference suppression and signal amplification method for subspace projection |
| CN102970256A (en) * | 2012-11-26 | 2013-03-13 | 清华大学 | Zero-space-based interference elimination method for multi-antenna device-to-device (D2D) communication system |
| CN102984100A (en) * | 2012-12-07 | 2013-03-20 | 汕头大学 | Multi-cell zero-forcing interference suppression method |
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