CN104836633A - Signal processing method and equipment - Google Patents

Signal processing method and equipment Download PDF

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Publication number
CN104836633A
CN104836633A CN201410049168.1A CN201410049168A CN104836633A CN 104836633 A CN104836633 A CN 104836633A CN 201410049168 A CN201410049168 A CN 201410049168A CN 104836633 A CN104836633 A CN 104836633A
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China
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matrix
interference source
representing
statistical property
interference
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CN201410049168.1A
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CN104836633B (en
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陆会贤
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention relates to the technical field of wireless communication, specially relates to a signal processing method and equipment, and is used to solve the problems that a current interference reduction scheme existing in the prior art cannot improve the system capacity and the signal-interference and noise ratio and cannot perform inhibition or coordination relative to a remote same-frequency cell. The method of the embodiment comprises determining a matrix for representing statistical characteristics of a reference source, performing matrix decomposition on the determined matrix for representing the statistical characteristics of the reference source to obtain an orthogonal complement space matrix, and performing normalized processing on an estimated value of a received signal according to the orthogonal complement space matrix of the reference source.

Description

A kind of method and apparatus of signal transacting
Technical field
The present invention relates to wireless communication technology field, particularly a kind of method and apparatus of signal transacting.
Background technology
LTE(Long Term Evolution, Long Term Evolution) be orthogonal between the same intra-cell users of system, therefore interference is mainly derived from the co-channel interference that the user of other communities and channeling cause.In the early stage research of LTE, enumerate the various inter-cell interference mitigation technique be once considered, mainly comprise:
Presence of intercell interference randomization (Inter-Cell Interference Randomization) and Inter-Cell Interference Coordination/avoid (Inter-Cell Interference Coordination/avoidance).
The basic thought of presence of intercell interference randomized technique is that interference signal is converted into random white noise, and conventional means comprise scrambling, intertexture, frequency hopping etc.;
The basic thought of Inter-Cell Interference Coordination/avoid is that the method mutually coordinated is by carrying out restriction to reach to the Resourse Distribute of each community avoiding causing strong jamming to neighbor cell as far as possible.
At the system networking initial stage, because user and community are all fewer, interference signal can wait and be all noise limited system, but along with the expansion of network size and the increase of user, the co-channel interference that the interference between subscriber equipment and channeling cause will play a leading role.
Presence of intercell interference randomization is by means such as scrambling, intertexture, frequency hoppings, although interference signal can be converted into white noise, interference power is not lowered, therefore can not capacity and Signal to Interference plus Noise Ratio (SINR).
Inter-Cell Interference Coordination/avoid technology to limit the interference of avoiding or alleviating minizone by the Resourse Distribute to each community, transmitted power etc., but along with the increase of number of user equipment, the complexity exponentially level growth of scheduling, be difficult to ensure the orthogonal of resources for user equipment between different districts in addition when scheduling resource is limited, the interference of minizone is still inevitable, and interference coordination is carried out in several communities that this technology is also merely able to for closing on, cannot carry out suppressing or coordinating for co-frequency cell far away.
In sum, the scheme alleviating interference at present can not capacity and Signal to Interference plus Noise Ratio, and cannot carry out suppressing or coordinating for co-frequency cell far away.
Summary of the invention
The invention provides a kind of method and apparatus of signal transacting, can not capacity and Signal to Interference plus Noise Ratio in order to solve the scheme alleviating interference at present that exists in prior art, and the problem that suppresses or coordinate cannot be carried out for co-frequency cell far away.
The embodiment of the present invention provides a kind of method of signal transacting, and the method comprises:
Determine the matrix of the statistical property representing interference source;
To described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
According to the orthogonal complement space matrix of described interference source, the estimated value of the signal received is normalized.
Preferably, determine the matrix of the statistical property representing interference source, comprising:
Determine the channel estimation value of community;
According to described channel estimation value, determine the matrix of the statistical property representing interference source.
Preferably, before determining the matrix of the statistical property representing interference source, also comprise:
Determine to receive signal.
Preferably, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source, comprising:
Adopt Eigenvalues Decomposition or singular value SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
Preferably, be normalized according to the estimated value of following formula to the signal received:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
The embodiment of the present invention provides a kind of equipment of signal transacting, comprising:
First determination module, for determining the matrix of the statistical property representing interference source;
Second determination module, for described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
Normalization module, for the orthogonal complement space matrix according to described interference source, is normalized the estimated value of the signal received.
Preferably, described first determination module specifically for:
Determine the channel estimation value of community; According to described channel estimation value, determine the matrix of the statistical property representing interference source.
Preferably, described first determination module also for:
Upon receipt of the signals, the matrix of the statistical property representing interference source is determined.
Preferably, described second determination module specifically for:
Adopt Eigenvalues Decomposition or singular value SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
Preferably, described normalization module specifically for, according to following formula, the estimated value of signal received is normalized:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
The embodiment of the present invention to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source; According to the orthogonal complement space matrix of described interference source, the estimated value of the signal received is normalized; And the embodiment of the present invention is theoretical based on signal subspace, the orthogonal complement space of interference and/or noise is obtained by matrix decomposition, thus form zero limit at interference radiating way, and equivalent wave beam is formed in desired signal direction, the Signal to Interference plus Noise Ratio of desired signal can greatly be improved.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram of the embodiment of the present invention one signal transacting;
Fig. 2 is the method flow schematic diagram of embodiment of the present invention binary signal process;
Fig. 3 is the device structure schematic diagram of the embodiment of the present invention three signal transacting;
Fig. 4 is the device structure schematic diagram of the embodiment of the present invention four signal transacting.
Embodiment
The embodiment of the present invention to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source; According to the orthogonal complement space matrix of described interference source, the estimated value of the signal received is normalized.
The embodiment of the present invention is based on the theory of subspace, and the orthogonal complement space matrix of structure interference source, limits in the spatially formation zero of interference source, spatially form wave beam at desired signal, thus reaches the object suppressing interference.Owing to not needing; And the embodiment of the present invention is theoretical based on signal subspace, the orthogonal complement space of interference and/or noise is obtained by matrix decomposition, thus form zero limit at interference radiating way, and equivalent wave beam is formed in desired signal direction, the Signal to Interference plus Noise Ratio of desired signal can greatly be improved.
Wherein, the interference source of the embodiment of the present invention can be noise; Also can be Noise and Interference, interference here includes but not limited to: have the signal source of same characteristic features with interference source, such as LTE signal etc., the signal source different from interference source statistical property, such as burst pulse etc.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As shown in Figure 1, the method for the embodiment of the present invention one signal transacting comprises:
Step 101, determine the matrix of statistical property representing interference source;
Step 102, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
Step 103, orthogonal complement space matrix according to described interference source, be normalized the estimated value of the signal received.
Wherein, the executive agent of the method for the embodiment of the present invention can be network equipment, also can be subscriber equipment.
The network equipment of the embodiment of the present invention can be base station (such as macro base station, micro-base station, Home eNodeB etc.), also can be RN(relaying) equipment can also be other network equipment
If network equipment, then the signal received is upward signal;
If subscriber equipment, the signal received is downstream signal.
The embodiment of the present invention upon receipt of the signals, can perform the step of the matrix determining the statistical property representing interference source.
Preferably, when determining the matrix of the statistical property representing interference source, the channel estimation value of community can first be determined; Then according to described channel estimation value, the matrix of the statistical property representing interference source is determined.
Concrete, when determining the channel estimation value of community, the Wiener filtering algorithm of LS or complexity can be adopted to obtain.Here community is one in the community of multiple area interference, and such as executive agent is UE(subscriber equipment), then community is exactly the community of UE access;
If executive agent is network equipment, then community is exactly the community of the UE access sending upward signal.
Wherein, the matrix of the statistical property for representing interference source of the embodiment of the present invention can be covariance matrix; Also can be autocorrelation matrix, cross-correlation matrix, second moment etc.
In force, the embodiment of the present invention can adopt direct or indirect method to determine the matrix of the statistical property representing interference source.
Direct method refers to the channel estimation value H obtaining interfered cell or subscriber equipment iif (executive agent is network equipment, then that obtain is the channel estimation value δ of interfered cell 2; If executive agent is subscriber equipment, then what obtain is the channel estimation value of subscriber equipment), and noise power, then according to channel estimation value and noise power, determine the matrix Φ of the statistical property representing interference source, such as adopt formula one;
Round-about way refers to and utilizes the channel estimation value of interfered cell or subscriber equipment (if executive agent is network equipment, then what obtain is the channel estimation value of interfered cell; If executive agent is subscriber equipment, then what obtain is the channel estimation value of subscriber equipment), reconstruct the desired signal of this community or subscriber equipment, and it is deducted r-H from the estimated value of the signal received is i, calculate the matrix Φ of the statistical property that can obtain for representing interference source further; Wherein r is the estimated value of the signal received, H is ifor the desired signal of this community or subscriber equipment.
Preferably, when adopting direct method, the matrix of the statistical property representing interference source can be determined according to formula one:
Φ = E [ ( I + N ) ( I + N ) H ]
= E [ ( Σ j = 0 , j ≠ i K - 1 H j s j + N ) ( Σ j = 0 , j ≠ i K - 1 H j s j + N ) H ]
= Σ j = 0 , j ≠ i K - 1 H j R s j s j H j H + δ 2 I
= Σ j = 0 , j ≠ i K - 1 δ j 2 H j H j H + δ 2 I Formula one;
Wherein, E is expressed as the desired value of signal; I is unit matrix; N is noise, and obedience average is 0 variance is δ 2multiple Gaussian Profile, represent the performance number of a jth interference; J is the subscript value (index) of all interference sources; I is for expecting cell ID, and i can not equal j, but i is the subset of j; H is expressed as channel estimate matrix; H jfor the channel estimation value of jGe community; K is the total quantity of interference source; S jfor the transmission signal of jGe community.
Preferably, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, when obtaining the orthogonal complement space matrix of interference source, Eigenvalues Decomposition or SVD(singular value can be adopted) decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source, namely obtain the characteristic vector w that characteristic value is 0 h, w hΦ w=0 or w hΦ w → 0.
Preferably, according to the orthogonal complement space matrix of described interference source, when the estimated value of the signal received is normalized, can be normalized according to the estimated value of formula two to the signal received:
S ~ i = w H r w H H i Formula two;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
The embodiment of the present invention is theoretical based on signal subspace, is obtained the orthogonal complement space of interference source by matrix decomposition, thus forms zero limit at interference radiating way, and forms wave beam in desired signal direction, can greatly improve the SINR of desired signal.
As shown in Figure 2, the method for embodiment of the present invention binary signal process comprises:
Step 201, receive signal;
Step 202, determine the channel estimation value of community;
Step 203, according to described channel estimation value, determine the matrix of statistical property representing interference source;
Step 204, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
Step 205, orthogonal complement space matrix according to described interference source, be normalized the estimated value of the signal received.
Based on same inventive concept, a kind of equipment of signal transacting is additionally provided in the embodiment of the present invention, the principle of dealing with problems due to this equipment is similar to the method for embodiment of the present invention signal transacting, and therefore the enforcement of this equipment see the enforcement of method, can repeat part and repeat no more.
As shown in Figure 3, the equipment of the embodiment of the present invention three signal transacting comprises:
First determination module 300, for determining the matrix of the statistical property representing interference source;
Second determination module 310, for described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
Normalization module 320, for the orthogonal complement space matrix according to described interference source, is normalized the estimated value of the signal received.
Preferably, described first determination module 300 specifically for:
Determine the channel estimation value of community; According to described channel estimation value, determine the matrix of the statistical property representing interference source.
Preferably, described first determination module 300 also for:
Upon receipt of the signals, the matrix of the statistical property representing interference source is determined.
Preferably, described second determination module 310 specifically for:
Adopt Eigenvalues Decomposition or SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
Preferably, described normalization module 320 specifically for, according to following formula, the estimated value of signal received is normalized:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
As shown in Figure 4, the equipment of the embodiment of the present invention four signal transacting comprises:
Processor 400, for determining the matrix of the statistical property representing interference source; To described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source; According to the orthogonal complement space matrix of described interference source, the estimated value of the signal received by transceiver 410 is normalized;
Transceiver 410, for receiving and sending data under the control of processor 400.
Preferably, processor 400 specifically for:
Determine the channel estimation value of community; According to described channel estimation value, determine the matrix of the statistical property representing interference source.
Preferably, processor 400 also for:
After receiving signal by transceiver 410, determine the matrix of the statistical property representing interference source.
Preferably, processor 400 specifically for:
Adopt Eigenvalues Decomposition or SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
Preferably, processor 400 specifically for, according to following formula, the estimated value of signal received is normalized:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
Wherein, in the diagram, bus architecture can comprise interconnected bus and the bridge of any amount, and the various electrical chains of the memory that the one or more processor specifically represented by processor 400 and memory 420 represent are connected together.Other electrical chains various of such as ancillary equipment, pressurizer and management circuit etc. and so on can also be connected together by bus architecture, and these are all known in the field, therefore, are no longer described further it herein.Bus interface provides interface.Transceiver 410 can be multiple element, namely comprises transmitter and receiver, be provided for over a transmission medium with the unit of other devices communicatings various.Processor 400 is in charge of bus architecture and common process, and memory 420 can the data that use when executable operations of storage of processor 400.
Processor 400 is in charge of bus architecture and common process, and memory 420 can the data that use when executable operations of storage of processor 400.
It can be seen from the above: the embodiment of the present invention is based on the theory of subspace, and the orthogonal complement space matrix of structure interference source, limits in the spatially formation zero of interference source, spatially form wave beam at desired signal, thus reaches the object suppressing interference; And the embodiment of the present invention is theoretical based on signal subspace, the orthogonal complement space of interference and/or noise is obtained by matrix decomposition, thus form zero limit at interference radiating way, and equivalent wave beam is formed in desired signal direction, the Signal to Interference plus Noise Ratio of desired signal can greatly be improved.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce equipment for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising commander equipment, and this commander equipment realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (10)

1. a method for signal transacting, is characterized in that, the method comprises:
Determine the matrix of the statistical property representing interference source;
To described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
According to the orthogonal complement space matrix of described interference source, the estimated value of the signal received is normalized.
2. the method for claim 1, is characterized in that, determines the matrix of the statistical property representing interference source, comprising:
Determine the channel estimation value of community;
According to described channel estimation value, determine the matrix of the statistical property representing interference source.
3. method as claimed in claim 1 or 2, is characterized in that, before determining the matrix of the statistical property representing interference source, also comprises:
Determine to receive signal.
4. method as claimed in claim 1 or 2, is characterized in that, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source, comprising:
Adopt Eigenvalues Decomposition or singular value SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
5. method as claimed in claim 2, is characterized in that, is normalized according to the estimated value of following formula to the signal received:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
6. an equipment for signal transacting, is characterized in that, this equipment comprises:
First determination module, for determining the matrix of the statistical property representing interference source;
Second determination module, for described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source;
Normalization module, for the orthogonal complement space matrix according to described interference source, is normalized the estimated value of the signal received.
7. equipment as claimed in claim 6, is characterized in that, described first determination module specifically for:
Determine the channel estimation value of community; According to described channel estimation value, determine the matrix of the statistical property representing interference source.
8. equipment as claimed in claims 6 or 7, is characterized in that, described first determination module also for:
Upon receipt of the signals, the matrix of the statistical property representing interference source is determined.
9. equipment as claimed in claims 6 or 7, is characterized in that, described second determination module specifically for:
Adopt Eigenvalues Decomposition or singular value SVD to decompose, to described in determining for representing that the matrix of the statistical property of interference source carries out matrix decomposition, obtain the orthogonal complement space matrix of interference source.
10. equipment as claimed in claim 7, is characterized in that, described normalization module specifically for, be normalized according to the estimated value of following formula to the signal received:
S ~ i = w H r w H H i ;
Wherein, w hit is the orthogonal complement space matrix of interference source; R is the estimated value of the signal received; H iit is the channel estimation value of community.
CN201410049168.1A 2014-02-12 2014-02-12 A kind of method and apparatus of signal processing Active CN104836633B (en)

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CN115441907A (en) * 2021-06-02 2022-12-06 大唐移动通信设备有限公司 Method and network equipment for beamforming transmission of MU-MIMO system

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CN115441907B (en) * 2021-06-02 2023-06-20 大唐移动通信设备有限公司 Method and network equipment for beamforming transmission of MU-MIMO system

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