WO2015165403A1 - 一种干扰抑制方法及装置 - Google Patents

一种干扰抑制方法及装置 Download PDF

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Publication number
WO2015165403A1
WO2015165403A1 PCT/CN2015/077806 CN2015077806W WO2015165403A1 WO 2015165403 A1 WO2015165403 A1 WO 2015165403A1 CN 2015077806 W CN2015077806 W CN 2015077806W WO 2015165403 A1 WO2015165403 A1 WO 2015165403A1
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prb
interference
ofdm symbol
subcarriers corresponding
interference matrix
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French (fr)
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刘昊
任斌
李琼
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China Academy of Telecommunications Technology CATT
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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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an interference suppression method and apparatus.
  • the Long Term Evolution (LTE) system basically adopts the F-band (1880-1920MHz), and the LTE system uplinks mainly have the following kinds of different system interferences in this frequency band: Global System for Mobile communication (GSM) 900 Interference in the second-order intermodulation interference of the frequency band, GSM1800 third-order intermodulation interference, and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) in the F-band blocking capability, personal hand-held telephone System (Personal Handy-phone System, PHS) network adjacent frequency interference.
  • GSM Global System for Mobile communication
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • PHS Personal Handy-phone System
  • the interference of the LTE uplink in the F-band is generally performed by Interference Rejection Combining (IRC) for interference suppression.
  • IRC Interference Rejection Combining
  • the interference matrix is calculated by using the uplink pilot symbols, and then the IRC equalization detection is performed on the uplink data symbols according to the calculated interference matrix, and the weighting value is obtained by the IRC equalization detection, thereby implementing interference suppression.
  • the inter-system interference is generally narrow-band interference, and the interference characteristics on different Orthogonal Frequency Division Multiplexing (OFDM) symbols have no regularity, once the pilot symbols are interfered.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the interference characteristics received on the data symbols are inconsistent, the desired interference matrix cannot be obtained, and the interference on the data symbols is difficult to suppress, resulting in a Cyclic Redundancy Check (CRC) check error.
  • CRC Cyclic Redundancy Check
  • An interference suppression method includes:
  • Performing interference suppression on the OFDM symbol for transmitting the data signal on the subcarrier set corresponding to each victim PRB according to the interference matrix on the subcarrier set corresponding to each of the victim PRBs, and the set of subcarriers corresponding to the victim PRB is subject to
  • the set of subcarriers corresponding to the PRB in which the interference of the interfered OFDM symbol is located, and the interference matrix on the set of subcarriers corresponding to the interfered PRB is the interference matrix of the interfered OFDM symbol on the set of subcarriers.
  • An interference suppression device includes:
  • the interference judging module is configured to determine whether each orthogonal frequency division multiplexing OFDM symbol of the current time slot is interfered on the subcarrier set corresponding to each physical resource block PRB;
  • An interference matrix determining module configured to determine, for the interfered OFDM symbol, an interference matrix on a set of subcarriers corresponding to each PRB where the interference is located;
  • the interference suppression processing module is configured to perform interference suppression on the OFDM symbol for transmitting the data signal on the subcarrier set corresponding to each victim PRB according to the interference matrix on the subcarrier set corresponding to each of the victim PRBs, and the interfered PRB
  • the corresponding subcarrier set is a set of subcarriers corresponding to the PRB in which the interference of the interfered OFDM symbol is located, and the interference matrix on the set of subcarriers corresponding to the interfered PRB is an interference matrix of the interfered OFDM symbol on the set of subcarriers.
  • the embodiment of the present invention further provides a base station, where the base station includes a processor and a memory.
  • the processor is configured to execute a computer program that determines whether an OFDM symbol of a current time slot is interfered with a set of subcarriers corresponding to each PRB; is an interfered OFDM symbol for transmitting a pilot signal or a data signal Determining an interference matrix on a set of subcarriers corresponding to each PRB in which the interference is located; and using the interference matrix on the set of subcarriers corresponding to each of the victim PRBs, for transmitting data on a set of subcarriers corresponding to each of the victim PRBs
  • the OFDM symbol of the signal performs interference suppression, and the set of subcarriers corresponding to the victim PRB is the set of subcarriers corresponding to the PRB in which the interference of the interfered OFDM symbol is located, and the interference matrix on the set of subcarriers corresponding to the victim PRB is the interfered OFDM.
  • the memory is configured to hold code for the computer program described above.
  • the technical solution provided by the embodiment of the present invention determines a corresponding interference matrix for each pilot symbol and data symbol that is interfered, instead of determining the interference matrix only for the interfered pilot symbols.
  • interference suppression may be performed on the data symbols according to the interference matrix of the pilot symbols and/or the data symbols on the subcarrier set corresponding to the same PRB. Since the interference characteristics of the data symbols are considered, the data can be effectively suppressed. Interference on the symbol.
  • FIG. 1 is a flowchart of a method according to an embodiment of the present invention
  • FIG. 3 is a frequency domain waveform diagram of each OFDM symbol of a first slot of a current subframe in a scenario according to an embodiment of the present invention
  • FIG. 4 is a constellation diagram of a first OFDM symbol demodulated by a conventional equalization detection algorithm in the scenario of FIG. 3;
  • 5 is a conventional equalization detection algorithm on a second OFDM symbol in the scenario related to FIG. Demodulated constellation
  • FIG. 6 is a constellation diagram of a third OFDM symbol demodulated by a conventional equalization detection algorithm in the scenario of FIG. 3;
  • FIG. 7 is a constellation diagram of the first OFDM symbol in the scenario of FIG. 3 after performing equalization detection and demodulation using the embodiment of the present invention
  • FIG. 8 is a constellation diagram of the second OFDM symbol in the scenario of FIG. 3 after performing equalization detection and demodulation according to an embodiment of the present invention.
  • FIG. 9 is a constellation diagram of the third OFDM symbol in the scenario of FIG. 3 after performing equalization detection and demodulation according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an interference suppression apparatus according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the interference suppression method provided by the embodiment of the present invention specifically includes the following operations:
  • Step 100 Determine whether each OFDM symbol of the current slot is interfered on the set of subcarriers corresponding to each PRB.
  • the symbols in each slot include two types of OFDM symbols, a pilot symbol and a data symbol.
  • Whether the OFDM symbol is interfered on the set of subcarriers corresponding to one PRB refers to whether there is interference in the time domain position defined by the OFDM symbol and the frequency domain position defined by the set of subcarriers corresponding to the PRB.
  • Step 110 Determine interference matrices on the set of subcarriers corresponding to each PRB where the interference is located, respectively, for the interfered OFDM symbols.
  • Step 120 Perform interference suppression on an OFDM symbol for transmitting a data signal on a set of subcarriers corresponding to each victim PRB according to an interference matrix on a set of subcarriers corresponding to each of the victim PRBs.
  • the subcarrier set corresponding to the victim PRB is the interference of the interfered OFDM symbol.
  • the set of subcarriers corresponding to the PRB is the interference of the interfered OFDM symbol.
  • the interference matrix on the set of subcarriers corresponding to the victim PRB is the interference matrix of the interfered OFDM symbol on the set of subcarriers.
  • the technical solution provided by the embodiment of the present invention determines a corresponding interference matrix for each pilot symbol and data symbol that is interfered, instead of determining the interference matrix only for the interfered pilot symbols.
  • interference suppression may be performed on the data symbols according to the interference matrix of the pilot symbols and/or the data symbols on the subcarrier set corresponding to the same PRB. Since the interference characteristics of the data symbols are considered, the data can be effectively suppressed. Interference on the symbol.
  • the IRC traditional interference matrix calculation method may be adopted.
  • the interfered data symbols there are many ways to determine the interference matrix. Some of them are listed below:
  • Manner 1 For a data symbol, determining, in a set of subcarriers corresponding to the PRB in which the interference is located, a subcarrier having the highest received signal strength on the data symbol; if the received signal strength on the subcarrier having the largest received signal strength is greater than Setting a threshold, determining, according to the received signal, an interference matrix on the set of subcarriers corresponding to the PRB for the data symbol; if the strength of the received signal is not greater than a set threshold, the data symbol is in the PRB The interference matrix on the set of subcarriers corresponding to the adjacent victim PRBs is used as the interference matrix on the set of subcarriers corresponding to the PRB.
  • the strength of the received signal may be reflected by the amplitude of the received signal, or may be reflected by the received power of the received signal, and the strength of the received signal may be reflected by other parameters, which is not limited by the present invention.
  • the specific value of the foregoing threshold value may be determined according to requirements in the actual application process, and may also be determined by simulation.
  • the method for determining the threshold value and the specific value thereof are not limited in the embodiment of the present invention.
  • the specific implementation manner of determining the interference matrix on the set of subcarriers corresponding to the PRB according to the received signal for the data symbol may be, but is not limited to:
  • the interference matrix on the set of subcarriers corresponding to the N PRBs is determined according to the following manner:
  • Manner 2 determining a subcarrier with the highest received signal strength on the data symbol in the set of subcarriers corresponding to the N PRBs; determining an interference matrix according to the received signal on the subcarrier with the highest received signal strength, and determining the interference The matrix acts as an interference matrix for the OFDM symbol on the set of subcarriers corresponding to each PRB of the N PRBs.
  • the interference on the set of subcarriers corresponding to the PRB is determined for the M data symbols according to the following manner 3 matrix:
  • Manner 3 determining a subcarrier with the highest received signal strength on the M data symbols in the set of subcarriers corresponding to the PRB; determining an interference matrix according to the received signal on the subcarrier with the highest received signal strength, and determining The interference matrix is used as the interference matrix of the M data symbols on the set of subcarriers corresponding to the PRB.
  • interference suppression is performed on data symbols on a set of subcarriers corresponding to each victim PRB according to an interference matrix on a set of subcarriers corresponding to each of the victim PRBs, but may be, but is not limited to, It is achieved as follows:
  • the IRC obtaining, by the IRC, the data on the subcarrier set corresponding to the first type of the victim PRB according to the interference matrix of the pilot symbols on the subcarrier set corresponding to the first type of the victim PRB.
  • the symbol performs interference suppression; wherein, the set of subcarriers corresponding to the first type of the victim PRB is a set of subcarriers corresponding to the PRB on which only the pilot symbol has an interference matrix;
  • the interference symbol on the set of subcarriers corresponding to the second type of victim PRB and the data symbol on the set of subcarriers corresponding to the second type of victim PRB according to the pilot symbols on the set of subcarriers corresponding to the second type of victim PRB are
  • the interference matrix on the set of subcarriers corresponding to the second type of the victim PRB is subjected to interference suppression by the IRC on the data symbols on the set of subcarriers corresponding to the second type of the victim PRB; wherein the subcarriers corresponding to the second type of the victimized PRB And a set of subcarriers corresponding to the PRBs of the interference matrix on which the pilot symbols and the data symbols are present;
  • the data on the subcarrier set corresponding to the third type of the victim PRB on the subcarrier set corresponding to the third type of the victim PRB performs interference suppression; wherein, the set of subcarriers corresponding to the third type of victim PRB is a set of subcarriers corresponding to the PRB on which only the data symbol has an interference matrix.
  • the technical solution provided by the embodiment of the present invention may interfere with the interference of the two types of symbols according to the interference matrix of the data symbols and the interference matrix of the pilot symbols.
  • the matrix suppresses interference of data symbols on the set of subcarriers by means of IRC, and since interference characteristics of data symbols are considered, interference on data symbols can be effectively suppressed. If there is only an interference matrix of data symbols on a set of subcarriers corresponding to one PRB, the existing scheme will not perform interference suppression on the existing scheme, and the technical solution provided by the embodiment of the present invention will interfere with such data symbols according to the interference characteristics. inhibition. If there is only the interference matrix of the pilot symbol on the set of subcarriers corresponding to one PRB, the interference matrix can reflect the interference characteristics on the corresponding data symbols, so the interference matrix on the pilot symbols can effectively suppress the interference on the data symbols. .
  • interference suppression is performed on the data symbols thereon by MRC (Maximum Radio Conbining).
  • the technical solution provided by the embodiment of the present invention is applicable to suppressing uplink interference of an LTE system, and is particularly suitable for suppressing narrowband interference of different systems.
  • the base station receives the baseband time domain symbols (ie, OFDM symbols), and after the cyclic prefix of the time domain symbols, transforms the time domain symbols into the frequency domain by FFT (Fast Fourier Transformation).
  • FFT Fast Fourier Transformation
  • whether or not the interference is affected is determined based on whether the calculated IOT value exceeds the threshold V 0 on the set of subcarriers corresponding to each PRB.
  • interference refers to neighbor interference and/or different system interference, where IOT is defined as the ratio of noise interference value to noise floor.
  • H i is an 8 ⁇ 1 channel matrix
  • s i is a pilot symbol on the ith subcarrier
  • I i is an interference symbol.
  • the pilot symbols are subject to neighbor interference and/or inter-system interference on the set of subcarriers corresponding to the current PRB. Otherwise, the pilot symbols are not interfered on the set of subcarriers corresponding to the current PRB.
  • the IOT value calculated by the pilot symbol on the subcarrier set corresponding to each PRB is between 1 and 2, and V 0 is greater than 2, it is determined that the current pilot symbol is not received on the subcarrier set corresponding to all PRBs. Interference, only the noise floor.
  • the interference they receive is heterogeneous system interference.
  • a method for judging whether there is interference in the data symbol is: calculating a mean value of received signal strength of the data symbol on the sub-carrier set corresponding to each PRB (that is, the former user equipment allocates each PRB) The average amplitude of the symbols above, and then remove the PRB where the sub-carriers of the first N maximum received signal strengths are located, and average the average strengths of the received signals on the set of subcarriers corresponding to all remaining PRBs, and determine each subcarrier. Whether the ratio of the intensity of the received signal to the average exceeds the threshold V 1 . If it is exceeded, it is judged that the data symbol is interfered on the current subcarrier, and the PRB where the current subcarrier is located is recorded as the victim PRB. Otherwise, it is considered that there is no interference.
  • the PRB where the current subcarrier is located is recorded as the victim PRB, otherwise it is considered that there is no interference.
  • the interference of the first three data symbols is performed.
  • the PRB is identified.
  • the interference matrix on the set of subcarriers corresponding to the PRB where the interference is located is determined.
  • the interference matrix can be referred to as a first interference matrix.
  • the first interference matrix is calculated as follows:
  • H i is an 8 ⁇ 1 channel matrix
  • s i is a symbol of the pilot symbol on the ith subcarrier.
  • I i is an interference symbol.
  • noise interference estimation Is the channel estimation result.
  • the first interference matrix identity is invalid.
  • the interference matrix can be referred to as a second interference matrix.
  • the sub-carrier with the largest received signal strength is selected from a PRB where the interference of the data symbol is located (the interference amplitude on the sub-carrier is considered to be the largest), if the strength of the received signal is determined as described above.
  • the ratio of the average amplitude value exceeds a certain threshold value V 2 , and the second interference matrix is calculated using the received signal.
  • H i is an 8 ⁇ 1 channel matrix
  • s i is a symbol of the data symbol on the ith subcarrier
  • I i is an interference symbol.
  • the second interference matrix R 2 E[(Y imax )(Y imax ) H ] of the data symbols on the set of subcarriers corresponding to the above PRB.
  • the second interference matrix calculated on the adjacent victim PRB may be used as the second interference matrix on the PRB.
  • the adjacent PRBs refer to PRBs adjacent in the frequency domain. If the data symbols are not interfered on the PRB adjacent to the PRB, the second interference matrix on the set of subcarriers corresponding to the PRB may not be calculated, or the second interference matrix calculated on the closest PRB in the frequency domain may be used. As the second interference matrix on the PRB, the second interference matrix may also be calculated in other ways. If both adjacent PRBs are interfered, a second interference matrix of one of the PRBs may be selected.
  • the second interference matrix calculated for the largest interfering subcarriers on all the victim PRBs may also be shared.
  • the foregoing processing process Specifically, first, it is determined whether the received signal strength on the maximum interference subcarrier exceeds a set threshold. If it is exceeded, the interference matrix is calculated according to the received signal. If not, the calculation may not be performed. The interference matrix on these several PRBs.
  • the second interference matrix calculated by the largest interference subcarriers on the data symbols may be shared.
  • the foregoing processing process Specifically, first, it is determined whether the received signal strength on the maximum interference subcarrier exceeds a set threshold. If it is exceeded, the interference matrix is calculated according to the received signal. If not, the calculation may not be performed. The interference matrix on these several PRBs.
  • the second interference matrix identifier is invalid for the PRB on the data symbol that is judged not to be interfered by the different system and the PRB that does not calculate the second interference matrix.
  • the final equalization detection adopts IRC or MRC.
  • the data symbol uses IRC in the equalization detection of the PRB.
  • the data symbol uses IRC in the equalization detection of the PRB.
  • the data symbol uses the MRC in the equalization detection of the PRB. .
  • the frequency domain waveforms of the respective OFDM symbols of the first time slot on the current subframe are shown in FIG. Among them, the first three OFDM symbols are obviously interfered by GSM intermodulation, and there are obvious peaks.
  • the fourth OFDM symbol is a pilot symbol distribution waveform.
  • 4 to 6 are constellation diagrams demodulated by the conventional equalization detection algorithm on the first three data symbols of the interference, respectively. Since there is no interference on the pilot, the default is to use MRC detection. However, the first three symbols are interfered by GSM, so the constellation of the first three symbols is cluttered.
  • FIG. 7 to FIG. 9 are constellation diagrams for demodulating the first three data symbols by using an equalization detection algorithm according to an embodiment of the present invention. From the figure, the constellation diagrams of the first three interfered data symbols are significantly improved. . It shows that with this scheme, even in the case of high interference, the constellation diagram can be significantly improved and the system performance can be improved.
  • the embodiment of the invention performs interference cancellation from the perspective of the physical layer algorithm, and optimizes the traditional IRC matrix to make interference suppression for the characteristics of GSM interference. From the simulation results, the system performance can be improved to some extent.
  • the embodiment of the present invention further provides an interference suppression device based on the same inventive concept as the method.
  • the device includes:
  • the interference judging module 101 is configured to determine whether each OFDM symbol of the current slot is interfered on the subcarrier set corresponding to each PRB;
  • the interference matrix determining module 102 is configured to determine, for the interfered OFDM symbol, an interference matrix on a set of subcarriers corresponding to each PRB where the interference is located;
  • the interference suppression processing module 103 is configured to perform interference suppression on the OFDM symbol for transmitting the data signal on the subcarrier set corresponding to each of the victim PRBs according to the interference matrix on the subcarrier set corresponding to each of the victim PRBs.
  • the subcarrier set corresponding to the PRB is the set of subcarriers corresponding to the PRB in which the interference of the interfered OFDM symbol is located, and the interference matrix on the set of subcarriers corresponding to the interfered PRB is the interference of the interfered OFDM symbol on the set of subcarriers. matrix.
  • the technical solution provided by the embodiment of the present invention determines a corresponding interference matrix for each pilot symbol and data symbol that is interfered, instead of determining the interference matrix only for the interfered pilot symbols.
  • interference suppression is performed, not only the interference symbol of the pilot symbol and/or the data symbol on the subcarrier set corresponding to the same PRB interferes with the data symbol, and since the interference characteristic of the data symbol is considered, the data can be effectively suppressed. Interference on the symbol.
  • the interference suppression processing module 103 is specifically configured to:
  • the interference matrix of the OFDM symbol used for transmitting the pilot signal on the set of subcarriers corresponding to the first type of the victim PRB according to the interference carrier of the first type of the received PRB Interference suppression is performed on an OFDM symbol for transmitting a data signal on a set of subcarriers corresponding to the perturbed PRB, and the set of subcarriers corresponding to the first type of the victim PRB is an OFDM symbol for transmitting only the pilot signal.
  • a set of subcarriers corresponding to the PRB of the interference matrix
  • An interference matrix of the OFDM symbol for transmitting the data signal on the set of subcarriers corresponding to the second type of the victimized PRB, and the subcarrier corresponding to the second type of the victimized PRB is combined by interference suppression Interference suppression is performed on an OFDM symbol for transmitting a data signal, and the set of subcarriers corresponding to the second type of victim PRB is an OFDM symbol for transmitting a pilot signal.
  • the OFDM symbols used for transmitting the data signal are each having a set of subcarriers corresponding to the PRB of the interference matrix;
  • the interference matrix on the set of subcarriers corresponding to the third type of the victim PRB according to the OFDM symbol for transmitting the data signal on the set of subcarriers corresponding to the third type of the victim PRB, and the third class is merged by interference suppression Interference suppression is performed on the OFDM symbol for transmitting the data signal on the set of subcarriers corresponding to the interfered PRB, and the set of subcarriers corresponding to the third type of the victim PRB is an OFDM symbol only used for transmitting the data signal, and the interference matrix exists thereon.
  • the set of subcarriers corresponding to the PRB is an OFDM symbol only used for transmitting the data signal, and the interference matrix exists thereon.
  • the interference matrix determining module 102 determines, according to the interference, the interference matrix on the set of subcarriers corresponding to one PRB in which the interference is located, for the OFDM symbol for transmitting the data signal:
  • the strength of the received signal is greater than a set threshold, determining, according to the received signal, an interference matrix on the set of subcarriers corresponding to the PRB for the interfered OFDM symbol for transmitting a data signal;
  • the interference matrix of the interfered OFDM symbol for transmitting a data signal on a set of subcarriers corresponding to the PRB adjacent to the PRB is used as The interference matrix on the set of subcarriers corresponding to the PRB.
  • the interference matrix determining module 102 determines an interference matrix on the set of subcarriers corresponding to the N PRBs:
  • an interference matrix as an interference matrix of the OFDM symbol on a set of subcarriers corresponding to each PRB of the N PRBs.
  • the interference matrix determining module 102 determining the interference matrix on the set of subcarriers corresponding to the PRB for the M OFDM symbols according to the following manner: :
  • an interference matrix as an interference matrix of the M OFDM symbols on a set of subcarriers corresponding to the PRB.
  • the interference suppression processing module 103 is further configured to:
  • interference suppression is performed on the OFDM symbols for transmitting the data signals on the set of subcarriers corresponding to the PRB by maximum ratio combining.
  • the interference suppression apparatus provided in the foregoing embodiment of the present invention may be a base station, or may be a function module built in the base station.
  • the embodiment of the present invention further provides a base station.
  • the base station includes a processor 111 and a memory 112.
  • the processor 111 is configured to execute a computer program having the function of determining whether an OFDM symbol of a current time slot is interfered on a set of subcarriers corresponding to each PRB; being an interfered OFDM for transmitting a pilot signal or a data signal
  • the symbol determines an interference matrix on a set of subcarriers corresponding to each PRB in which the interference is located; and uses an interference matrix on a set of subcarriers corresponding to each victim PRB for transmission on a set of subcarriers corresponding to each of the victim PRBs
  • the OFDM symbol of the data signal performs interference suppression, and the set of subcarriers corresponding to the victim PRB is the set of subcarriers corresponding to the PRB in which the interference of the interfered OFDM symbol is located, and the interference matrix on the set of subcarriers corresponding to the victim PRB is interfered.
  • the memory 112 is configured to store code for the computer program described above.
  • the technical solution provided by the embodiment of the present invention determines a corresponding interference matrix for each pilot symbol and data symbol that is interfered, instead of determining the interference matrix only for the interfered pilot symbols.
  • interference suppression is performed, not only subcarrier sets corresponding to pilot symbols and/or data symbols in the same PRB
  • the closed interference matrix performs interference suppression on the data symbols, and since the interference characteristics of the data symbols are considered, the interference on the data symbols can be effectively suppressed.
  • the base station in the embodiment of the present invention may be a macro base station, a home base station, a micro base station, a relay, or the like.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种干扰抑制方法及装置。其方法包括：确定当前时隙中每个OFDM符号在各个PRB对应的子载波集合上是否受到干扰；为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上的数据符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。由于考虑了数据符号的干扰特性，因此可以有效抑制数据符号上的干扰。

Description

一种干扰抑制方法及装置
本申请要求在2014年4月29日提交中国专利局、申请号为201410178853.4、发明名称为“一种干扰抑制方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域，尤其涉及一种干扰抑制方法及装置。
背景技术
长期演进(Long Term Evolution，LTE)系统基本上采用F频段(1880-1920MHz)，LTE系统上行在这个频段主要存在以下几种异系统干扰：全球移动通信系统(Global System for Mobile communication，GSM)900频段二阶互调干扰、GSM1800三阶互调干扰、时分同步码分多址接入(Time Division-Synchronous Code Division Multiple Access，TD-SCDMA)在F频段阻塞能力不强引入的干扰，个人手持电话系统(Personal Handy-phone System，PHS)网络邻频干扰等。
LTE上行在F频段的干扰一般通过干扰抑制合并(Interference Rejection Combining，IRC)进行干扰抑制。具体是通过上行导频符号计算得到干扰矩阵，然后根据计算得到的干扰矩阵在上行数据符号上进行IRC均衡检测，通过IRC均衡检测得到加权值，进而实现干扰抑制。
在一个LTE上行子帧内，异系统干扰一般为窄带干扰，且在不同正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)符号上的干扰特征没有一定的规律，一旦导频符号受到的干扰和数据符号上受到的干扰特性不一致时，无法得到期望的干扰矩阵，数据符号上的干扰就很难抑制，造成循环冗余(Cyclic Redundancy Check，CRC)校验错误。
发明内容
本发明的目的是提供一种干扰抑制方法及装置，以解决目前采用IRC进行干扰抑制存在的问题。
本发明的目的是通过以下技术方案实现的：
一种干扰抑制方法，包括：
确定当前时隙的每个正交频分复用OFDM符号在各个物理资源块PRB对应的子载波集合上是否受到干扰；
为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；
根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
一种干扰抑制装置，包括：
干扰判断模块，用于确定当前时隙的每个正交频分复用OFDM符号在各个物理资源块PRB对应的子载波集合上是否受到干扰；
干扰矩阵确定模块，用于为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；
干扰抑制处理模块，用于根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
基于与方法同样的发明构思，本发明实施例还提供一种基站，该基站包括处理器和存储器。
该处理器被配置为执行具备下列功能的计算机程序：确定当前时隙的OFDM符号在各个PRB对应的子载波集合上是否受到干扰；为受干扰的用于传输导频信号或数据信号的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
该存储器被配置为保存上述计算机程序的代码。
本发明实施例提供的技术方案，针对受干扰的每个导频符号和数据符号都确定相应的干扰矩阵，而不是仅对受干扰的导频符号确定干扰矩阵。在进行干扰抑制时，可根据导频符号和/或数据符号在同一个PRB对应的子载波集合上的干扰矩阵对数据符号进行干扰抑制，由于考虑了数据符号的干扰特性，因此可以有效抑制数据符号上的干扰。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一个实施例提供的方法流程图；
图2为本发明另一个实施例提供的方法流程图；
图3为本发明一个实施例的场景中当前子帧的第一个时隙的各个OFDM符号的频域波形图；
图4为图3涉及的场景中的第一个OFDM符号上采用传统均衡检测算法解调后的星座图；
图5为图3涉及的场景中的第二个OFDM符号上采用传统均衡检测算法 解调后的星座图；
图6为图3涉及的场景中的第三个OFDM符号上采用传统均衡检测算法解调后的星座图；
图7为图3涉及的场景中的第一个OFDM符号上采用本发明实施例进行均衡检测解调后的星座图；
图8为图3涉及的场景中的第二个OFDM符号上采用本发明实施例进行均衡检测解调后的星座图；
图9为图3涉及的场景中的第三个OFDM符号上采用本发明实施例进行均衡检测解调后的星座图；
图10为本发明实施例提供的一种干扰抑制装置的结构示意图；
图11为本发明实施例提供的一种基站的结构示意图。
具体实施方式
下面将结合附图，对本发明实施例提供的技术方案进行详细说明。
如图1所示，本发明实施例提供的干扰抑制方法具体包括如下操作：
步骤100、确定当前时隙的每个OFDM符号在各个PRB对应的子载波集合上是否受到干扰。
每个时隙中的符号包括导频符号和数据符号两类OFDM符号。
OFDM符号在一个PRB对应的子载波集合上是否受到干扰，是指该OFDM符号限定的时域位置以及该PRB对应的子载波集合限定的频域位置上是否存在干扰。
步骤110、为受干扰的OFDM符号分别确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵。
步骤120、根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制。
其中，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的 PRB对应的子载波集合。
其中，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在该子载波集合上的干扰矩阵。
本发明实施例提供的技术方案，针对受干扰的每个导频符号和数据符号都确定相应的干扰矩阵，而不是仅对受干扰的导频符号确定干扰矩阵。在进行干扰抑制时，可根据导频符号和/或数据符号在同一个PRB对应的子载波集合上的干扰矩阵对数据符号进行干扰抑制，由于考虑了数据符号的干扰特性，因此可以有效抑制数据符号上的干扰。
本发明实施例中，对于受干扰的导频符号，可以采用IRC传统的干扰矩阵计算方法。对于受干扰的数据符号，其干扰矩阵的确定方式有多种，下面例举其中几种：
可以按照如下方式一为受干扰的数据符号确定在干扰所在的一个PRB对应的子载波集合上的干扰矩阵：
方式一：对于一个数据符号，在干扰所在的PRB对应的子载波集合中，确定在该数据符号上的接收信号强度最大的子载波；如果该接收信号强度最大的子载波上的接收信号强度大于设定的阈值，则根据该接收信号为该数据符号确定在该PRB对应的子载波集合上的干扰矩阵；如果该接收信号的强度不大于设定的阈值，则将该数据符号在与该PRB相邻的受扰PRB对应的子载波集合上的干扰矩阵作为在该PRB对应的子载波集合上的干扰矩阵。
上述方式一中，接收信号的强度可以通过接收信号的幅度体现，也可以通过接收信号的接收功率体现，还可以通过其他参数体现接收信号的强度，本发明对此不作限定。
上述方式一中，上述阈值的具体取值可以在实际应用过程中根据需要确定，也可以通过仿真进行确定，本发明实施例对上述阈值的确定方式及其具体取值不作限定。
上述方式一中，根据该接收信号为该数据符号确定在该PRB对应的子载波集合上的干扰矩阵的具体实现方式可以但不仅限于是：
如果数据符号在连续N个PRB对应的子载波集合上受到干扰，N为不小于2的整数，则按照如下方式二为该数据符号确定在这N个PRB对应的子载波集合上的干扰矩阵：
方式二：确定上述N个PRB对应的子载波集合中在该数据符号上的接收信号强度最大的子载波；根据该接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为该OFDM符号在这N个PRB中每个PRB对应的子载波集合上的干扰矩阵。
如果连续M个数据符号在同一个PRB对应的子载波集合上受到干扰，M为不小于2的整数，则按照如下方式三为这M个数据符号确定在该PRB对应的子载波集合上的干扰矩阵：
方式三：确定该PRB对应的子载波集合中，在上述M个数据符号上的接收信号强度最大的子载波；根据所述接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为这M个数据符号在该PRB对应的子载波集合上的干扰矩阵。
基于上述任意方法实施例，较佳地，根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上的数据符号进行干扰抑制，可以但不仅限于通过如下方式实现：
根据第一类受扰PRB对应的子载波集合上导频符号在第一类受扰PRB对应的子载波集合上的干扰矩阵，通过IRC对第一类受扰PRB对应的子载波集合上的数据符号进行干扰抑制；其中，第一类受扰PRB对应的子载波集合为仅导频符号在其上存在干扰矩阵的PRB对应的子载波集合；
根据第二类受扰PRB对应的子载波集合上的导频符号在第二类受扰PRB对应的子载波集合上的干扰矩阵、第二类受扰PRB对应的子载波集合上的数据符号在第二类受扰PRB对应的子载波集合上的干扰矩阵，通过IRC对第二类受扰PRB对应的子载波集合上的数据符号进行干扰抑制；其中，第二类受扰PRB对应的子载波集合为导频符号和数据符号均在其上存在干扰矩阵的PRB对应的子载波集合；
根据第三类受扰PRB对应的子载波集合上的数据符号在第三类受扰PRB对应的子载波集合上的干扰矩阵，通过IRC对第三类受扰PRB对应的子载波集合上的数据符号进行干扰抑制；其中，第三类受扰PRB对应的子载波集合为仅数据符号在其上存在干扰矩阵的PRB对应的子载波集合。
其中，如果一个PRB对应的子载波集合上既有数据符号的干扰矩阵，又有导频符号的干扰矩阵，本发明实施例提供的技术方案会根据这两类符号在该子载波集合上的干扰矩阵，通过IRC的方式对数据符号在该子载波集合上的干扰进行抑制，由于考虑到数据符号的干扰特性，因此能够有效抑制数据符号上的干扰。如果一个PRB对应的子载波集合上仅有数据符号的干扰矩阵，现有方案将不会对其进行干扰抑制，而本发明实施例提供的技术方案会对这类数据符号根据其干扰特性进行干扰抑制。如果一个PRB对应的子载波集合上仅有导频符号的干扰矩阵，该干扰矩阵能够反映相应的数据符号上的干扰特性，因此使用导频符号上的干扰矩阵就能够有效抑制数据符号上的干扰。
基于上述任意方法实施例，对于没有OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合，对其上的数据符号通过MRC(Maximum Radio Conbining，最大比合并)进行干扰抑制。
本发明实施例提供的技术方案适用于对LTE系统的上行干扰进行抑制，尤其适用于抑制异系统窄带干扰。
下面结合图2，对本发明实施例提供的方法进行详细描述。
其中，基站接收基带时域符号(即OFDM符号)，对时域符号去循环前缀后，通过FFT(Fast Fourier Transformation，快速傅里叶变换)将时域符号变换到频域。
对每个子帧上变换到频域上的符号，按照如下方式进行分析及干扰抑制：
分别判断每个导频符号和数据符号在其所在时隙的各个PRB对应的子载波集合上是否受到干扰。
对于导频符号，在每个PRB对应的子载波集合上根据计算的IOT值是否 超过门限V0来判断是否受到干扰。
对导频符号而言，干扰指的是邻区干扰和/或异系统干扰，其中IOT定义为噪声干扰值与底噪的比值。
假设导频符号在当前PRB的第i个子载波上的接收信号Yi＝Hisi+Ii。Hi是8×1的信道矩阵，si是第i个子载波上导频符号，Ii是干扰符号。
其中噪声干扰估计
Figure PCTCN2015077806-appb-000001
Figure PCTCN2015077806-appb-000002
是信道估计结果。
IOT＝mean(diag(R))/P_noise
其中diag表示对矩阵取对角元素，P_noise是设备底噪。
如果IOT>V0，则导频符号在当前PRB对应的子载波集合上受到邻区干扰和/或异系统干扰，否则，导频符号在当前PRB对应的子载波集合上没有受到干扰。
例如，导频符号在各个PRB对应的子载波集合上计算得到的IOT值均在1～2之间，V0大于2，则判断当前导频符号在所有PRB对应的子载波集合上均没有受到干扰，只有底噪。
对数据符号，其受到的干扰为异系统干扰。
由于异系统干扰特性表现为窄带高强度干扰，一种判断数据符号是否存在干扰的方法为：计算数据符号在各个PRB对应的子载波集合上的接收信号强度均值(即前用户设备分配每个PRB上的符号平均幅度)，然后去掉前N个最大接收信号强度的子载波所在的PRB，将剩下的所有PRB对应的子载波集合上的接收信号的平均强度再取平均值，判断每个子载波上接收信号的强度与该平均值的比值是否超过门限V1。如果超过则判断数据符号在当前子载波受到干扰，并记录当前子载波所在的PRB为受扰PRB。否则认为没有受到干扰。
假设数据符号在第i个PRB的第j个子载波接收信号为rj，其幅度(即信号强度)bj＝abs(rj)。
数据符号在第i个PRB的子载波集合上符号平均幅度
Figure PCTCN2015077806-appb-000003
其中j＝(i-1)*12:i*12。
对
Figure PCTCN2015077806-appb-000004
从大到小排序，找出前N个最大幅度值(N取值可取1～5)，并去掉，对剩下的
Figure PCTCN2015077806-appb-000005
再取平均，得到
Figure PCTCN2015077806-appb-000006
然后计算数据符号在每个子载波上的接收符号幅度与
Figure PCTCN2015077806-appb-000007
的比值，如果比值超过门限V1，就记录当前子载波所在的PRB为受扰PRB，否则认为没有受到干扰。
本实施例中，假设当前子帧的前三个数据符号在至少一个PRB对应的子载波集合上均检测到干扰，后九个数据符号没有检测到干扰，则对前三个数据符号的受扰PRB进行标识。
对于受到干扰的每个导频符号及数据符号，分别确定其在干扰所在的PRB对应的子载波集合上的干扰矩阵。
对于导频符号，其干扰矩阵可以称为第一干扰矩阵。
第一干扰矩阵的计算方式如下：
假设导频符号在一个存在干扰的PRB的第i个子载波上的接收符号Yi＝Hisi+Ii。Hi是8×1的信道矩阵，si是导频符号在第i个子载波上的符号。Ii是干扰符号。
其中，噪声干扰估计
Figure PCTCN2015077806-appb-000008
Figure PCTCN2015077806-appb-000009
是信道估计结果。
导频符号在该PRB对应的子载波集合上的第一干扰矩阵
Figure PCTCN2015077806-appb-000010
对于导频符号在其上没有受干扰的PRB，第一干扰矩阵标识无效。
对于数据符号，其干扰矩阵可以称为第二干扰矩阵。
在存在异系统干扰数据符号上，从数据符号的干扰所在的一个PRB上挑选出接收信号强度最大的子载波(认为该子载波上的干扰幅度最大)，如果该接收信号的强度与上述确定的平均幅度值的比值超过某一门限值V2，就用该接收信号计算第二干扰矩阵。
具体的，假设选择的上述PRB的子载波上的接收信号Yimax＝Hisi+Ii。Hi是8×1的信道矩阵，si是该数据符号在第i个子载波上的符号，Ii是干扰符号。
数据符号在上述PRB对应的子载波集合上的第二干扰矩阵R2＝E[(Yimax)(Yimax)H]。
如果上述接收信号的强度与上述确定的平均幅度值的比值没有超过V2，可采用相邻受扰PRB上计算的第二干扰矩阵，作为该PRB上的第二干扰矩阵。其中，相邻PRB是指在频域上相邻的PRB。如果数据符号在该PRB相邻的PRB上没有受到干扰，可以不计算在该PRB对应的子载波集合上的第二干扰矩阵，也可以采用频域上最接近的PRB上计算的第二干扰矩阵作为该PRB上的第二干扰矩阵，也可以采用其他方式计算第二干扰矩阵。如果相邻的两个PRB都受到干扰，则可以选择其中一个PRB的第二干扰矩阵。
如果数据符号在连续几个PRB上受异系统干扰，也可共用所有受扰PRB上最大干扰子载波计算的第二干扰矩阵。其具体实现方式可以参照上述处理过程，具体的，首先判断最大干扰子载波上的接收信号强度是否超过设定的阈值，如果超过，根据该接收信号计算干扰矩阵，如果未超过，可以不计算在这几个PRB上的干扰矩阵。
如果同一个PRB上连续几个数据符号受异系统干扰，可共用这几个数据符号上的最大干扰子载波计算的第二干扰矩阵。其具体实现方式可以参照上述处理过程，具体的，首先判断最大干扰子载波上的接收信号强度是否超过设定的阈值，如果超过，根据该接收信号计算干扰矩阵，如果未超过，可以不计算在这几个PRB上的干扰矩阵。
对于数据符号上判断没有受异系统干扰的PRB以及没有计算第二干扰矩阵的PRB，第二干扰矩阵标识无效。
根据第一干扰矩阵和第二干扰矩阵，决定最终均衡检测采用IRC或者MRC。
如果数据符号的干扰所在的PRB中的导频符号在该PRB上存在第一干扰 矩阵，而数据符号在该PRB上不存在第二干扰矩阵，则该数据符号在该PRB的均衡检测采用IRC，且采用的干扰矩阵R＝R1；
如果数据符号的干扰所在的PRB中的导频符号在该PRB上不存在第一干扰矩阵，而数据符号在该PRB上存在第二干扰矩阵，则该数据符号在该PRB的均衡检测采用IRC，且采用的干扰矩阵R＝R2；
如果数据符号的干扰所在的PRB中的导频符号在该PRB上存在第一干扰矩阵，数据符号在该PRB上存在第二干扰矩阵，则该数据符号在该PRB的均衡检测采用IRC，且采用的干扰矩阵R＝R1+R2；
如果数据符号的干扰所在的PRB中的导频符号在该PRB上不存在第一干扰矩阵，数据符号在该PRB上也不存在第二干扰矩阵，则该数据符号在该PRB的均衡检测采用MRC。
当前子帧上第一个时隙的各个OFDM符号的频域波形图3所示。其中，前三个OFDM符号明显受到了GSM互调干扰，有明显的峰值出现。第四个OFDM符号是导频符号分布波形。采用本发明实施例提供的技术方案可以准确检测到干扰并进行干扰抑制。
图4至图6分别是受干扰的前三个数据符号上采用传统的均衡检测算法解调后的星座图。由于导频上没有受到干扰，默认是采用MRC检测。但前三个符号受到GSM干扰，因此前三个符号的星座图比较杂乱。
图7至图9是采用本发明实施例对前三个数据符号上进行均衡检测算法解调后的星座图，从图上看，前三个受干扰的数据符号的星座图有了明显的改善。说明采用本方案，即使在高干扰情况下，也能使星座图得到明显的改善，提高系统性能。
本发明实施例从物理层算法角度进行干扰消除，通过对传统的IRC矩阵进行优化，使之更针对GSM干扰的特性进行干扰抑制，从仿真结果看，能在一定程度上提高系统性能。
基于与方法同样的发明构思，本发明实施例还提供一种干扰抑制装置， 如图10所示，该装置包括：
干扰判断模块101，用于确定当前时隙的每个OFDM符号在各个PRB对应的子载波集合上是否受到干扰；
干扰矩阵确定模块102，用于为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；
干扰抑制处理模块103，用于根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
本发明实施例提供的技术方案，针对受干扰的每个导频符号和数据符号都确定相应的干扰矩阵，而不是仅对受干扰的导频符号确定干扰矩阵。在进行干扰抑制时，不是仅导频符号和/或数据符号在同一个PRB对应的子载波集合上的干扰矩阵对数据符号进行干扰抑制，由于考虑了数据符号的干扰特性，因此可以有效抑制数据符号上的干扰。
较佳地，干扰抑制处理模块103具体用于：
根据第一类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第一类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第一类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，所述第一类受扰PRB对应的子载波集合为仅用于传输导频信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合；
根据第二类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵、和所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，所述第二类受扰PRB对应的子载波集合为用于传输导频信号的OFDM符号和 用于传输数据信号的OFDM符号均在其上存在干扰矩阵的PRB对应的子载波集合；
根据第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第三类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，所述第三类受扰PRB对应的子载波集合为仅用于传输数据信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合。
较佳地，所述干扰矩阵确定模块102按照如下方式为受干扰的用于传输数据信号的OFDM符号确定在干扰所在的一个PRB对应的子载波集合上的干扰矩阵：
确定干扰所在的所述PRB对应的子载波集合中，在所述受干扰的用于传输数据信号的OFDM符号上的接收信号强度最大的子载波；
如果所述接收信号的强度大于设定的阈值，根据所述接收信号为所述受干扰的用于传输数据信号的OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵；
如果所述接收信号的强度不大于设定的阈值，将所述受干扰的用于传输数据信号的OFDM符号在与所述PRB相邻的PRB对应的子载波集合上的干扰矩阵作为在所述PRB对应的子载波集合上的干扰矩阵。
较佳地，如果用于传输数据信号的OFDM符号在连续N个PRB对应的子载波集合上受到干扰，所述N为不小于2的整数，所述干扰矩阵确定模块102按照如下方式为所述OFDM符号确定在所述N个PRB对应的子载波集合上的干扰矩阵：
确定所述N个PRB对应的子载波集合中在所述OFDM符号上的接收信号强度最大的子载波；
根据所述接收信号确定干扰矩阵作为所述OFDM符号在所述N个PRB中每个PRB对应的子载波集合上的干扰矩阵。
较佳地，如果连续M个用于传输数据信号的OFDM符号在同一个PRB 对应的子载波集合上受到干扰，所述M为不小于2的整数，所述干扰矩阵确定模块102按照如下方式为所述M个OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵：
确定所述PRB对应的子载波集合中，在所述M个OFDM符号上的接收信号强度最大的子载波；
根据所述接收信号确定干扰矩阵作为所述M个OFDM符号在所述PRB对应的子载波集合上的干扰矩阵。
基于上述任意装置实施例，较佳地，所述干扰抑制处理模块103还用于：
对于没有OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合，对所述PRB对应的子载波集合上用于传输数据信号的OFDM符号通过最大比合并进行干扰抑制。
上述本发明实施例提供的干扰抑制装置可以是基站，也可以是内置于基站中的功能模块。
基于与方法同样的发明构思，本发明实施例还提供一种基站，如图11所示，该基站包括处理器111和存储器112。
该处理器111被配置为执行具备下列功能的计算机程序：确定当前时隙的OFDM符号在各个PRB对应的子载波集合上是否受到干扰；为受干扰的用于传输导频信号或数据信号的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
该存储器112被配置为保存上述计算机程序的代码。
本发明实施例提供的技术方案，针对受干扰的每个导频符号和数据符号都确定相应的干扰矩阵，而不是仅对受干扰的导频符号确定干扰矩阵。在进行干扰抑制时，不是仅导频符号和/或数据符号在同一个PRB对应的子载波集 合上的干扰矩阵对数据符号进行干扰抑制，由于考虑了数据符号的干扰特性，因此可以有效抑制数据符号上的干扰。
本发明实施例中的基站，可以是宏基站、家庭基站、微基站、中继等等。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权 利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (12)

  1. 一种干扰抑制方法，其特征在于，包括：
    确定当前时隙的每个正交频分复用OFDM符号在各个物理资源块PRB对应的子载波集合上是否受到干扰；
    为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；
    根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
  2. 根据权利要求1所述的方法，其特征在于，根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，包括：
    根据第一类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第一类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第一类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，所述第一类受扰PRB对应的子载波集合为仅用于传输导频信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合；
    根据第二类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵、所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制；其中，所述第二类受扰PRB对应的子载波集合为用于传输导频信号的OFDM符号和用于传输数据信号的OFDM符号均在其上存在干扰矩阵的PRB对应的子 载波集合；
    根据第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第三类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制；其中，所述第三类受扰PRB对应的子载波集合为仅用于传输数据信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合。
  3. 根据权利要求1或2所述的方法，其特征在于，按照如下方式为受干扰的用于传输数据信号的OFDM符号确定在干扰所在的一个PRB对应的子载波集合上的干扰矩阵：
    确定干扰所在的PRB对应的子载波集合中，在受干扰的用于传输数据信号的OFDM符号上的接收信号强度最大的子载波；
    如果所述接收信号强度最大的子载波上的接收信号的强度大于设定的阈值，则根据所述接收信号为所述受干扰的用于传输数据信号的OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵；
    如果所述接收信号强度最大的子载波上的接收信号的强度不大于设定的阈值，则将所述受干扰的用于传输数据信号的OFDM符号在与所述PRB相邻的受扰PRB对应的子载波集合上的干扰矩阵作为在所述PRB对应的子载波集合上的干扰矩阵。
  4. 根据权利要求1或2所述的方法，其特征在于，如果用于传输数据信号的OFDM符号在连续N个PRB对应的子载波集合上受到干扰，所述N为不小于2的整数，则按照如下方式为所述OFDM符号确定在所述N个PRB对应的子载波集合上的干扰矩阵：
    确定所述N个PRB对应的子载波集合中在所述OFDM符号上的接收信号强度最大的子载波；
    根据所述接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为所述OFDM符号在所述N个PRB中每个PRB对应的子载波集合上的干扰矩阵。
  5. 根据权利要求1或2所述的方法，其特征在于，如果连续M个用于传输数据信号的OFDM符号在同一个PRB对应的子载波集合上受到干扰，所述M为不小于2的整数，则按照如下方式为所述M个OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵：
    确定所述同一个PRB对应的子载波集合中，在所述M个OFDM符号上的接收信号强度最大的子载波；
    根据所述接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为所述M个OFDM符号在所述PRB对应的子载波集合上的干扰矩阵。
  6. 根据权利要求1或2所述的方法，其特征在于，该方法还包括：
    对于没有OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合，对所述PRB对应的子载波集合上用于传输数据信号的OFDM符号通过最大比合并进行干扰抑制。
  7. 一种干扰抑制装置，其特征在于，包括：
    干扰判断模块，用于确定当前时隙的每个正交频分复用OFDM符号在各个物理资源块PRB对应的子载波集合上是否受到干扰；
    干扰矩阵确定模块，用于为受干扰的OFDM符号确定在干扰所在的每个PRB对应的子载波集合上的干扰矩阵；
    干扰抑制处理模块，用于根据每个受扰PRB对应的子载波集合上的干扰矩阵，为每个受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，受扰PRB对应的子载波集合为受干扰的OFDM符号的干扰所在的PRB对应的子载波集合，受扰PRB对应的子载波集合上的干扰矩阵为受干扰的OFDM符号在所述子载波集合上的干扰矩阵。
  8. 根据权利要求7所述的装置，其特征在于，所述干扰抑制处理模块具体用于：
    根据第一类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第一类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合 并对所述第一类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制，所述第一类受扰PRB对应的子载波集合为仅用于传输导频信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合；
    根据第二类受扰PRB对应的子载波集合上用于传输导频信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵、所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第二类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第二类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制；其中，所述第二类受扰PRB对应的子载波集合为用于传输导频信号的OFDM符号和用于传输数据信号的OFDM符号均在其上存在干扰矩阵的PRB对应的子载波集合；
    根据第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号在所述第三类受扰PRB对应的子载波集合上的干扰矩阵，通过干扰抑制合并对所述第三类受扰PRB对应的子载波集合上用于传输数据信号的OFDM符号进行干扰抑制；其中，所述第三类受扰PRB对应的子载波集合为仅用于传输数据信号的OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合。
  9. 根据权利要求7或8所述的装置，其特征在于，所述干扰矩阵确定模块按照如下方式为受干扰的用于传输数据信号的OFDM符号确定在干扰所在的一个PRB对应的子载波集合上的干扰矩阵：
    确定干扰所在的PRB对应的子载波集合中，在受干扰的用于传输数据信号的OFDM符号上的接收信号强度最大的子载波；
    如果所述接收信号强度最大的子载波上的接收信号的强度大于设定的阈值，则根据所述接收信号为所述受干扰的用于传输数据信号的OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵；
    如果所述接收信号强度最大的子载波上的接收信号的强度不大于设定的阈值，则将所述受干扰的用于传输数据信号的OFDM符号在与所述PRB相邻的受扰PRB对应的子载波集合上的干扰矩阵作为在所述PRB对应的子载波集 合上的干扰矩阵。
  10. 根据权利要求7或8所述的装置，其特征在于，如果用于传输数据信号的OFDM符号在连续N个PRB对应的子载波集合上受到干扰，所述N为不小于2的整数，则所述干扰矩阵确定模块按照如下方式为所述OFDM符号确定在所述N个PRB对应的子载波集合上的干扰矩阵：
    确定所述N个PRB对应的子载波集合中在所述OFDM符号上的接收信号强度最大的子载波；
    根据所述接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为所述OFDM符号在所述N个PRB中每个PRB对应的子载波集合上的干扰矩阵。
  11. 根据权利要求7或8所述的装置，其特征在于，如果连续M个用于传输数据信号的OFDM符号在同一个PRB对应的子载波集合上受到干扰，所述M为不小于2的整数，则所述干扰矩阵确定模块按照如下方式为所述M个OFDM符号确定在所述PRB对应的子载波集合上的干扰矩阵：
    确定所述同一个PRB对应的子载波集合中，在所述M个OFDM符号上的接收信号强度最大的子载波；
    根据所述接收信号强度最大的子载波上的接收信号确定干扰矩阵，将确定出的干扰矩阵作为所述M个OFDM符号在所述PRB对应的子载波集合上的干扰矩阵。
  12. 根据权利要求7或8所述的装置，其特征在于，所述干扰抑制处理模块还用于：
    对于没有OFDM符号在其上存在干扰矩阵的PRB对应的子载波集合，对所述PRB对应的子载波集合上用于传输数据信号的OFDM符号通过最大比合并进行干扰抑制。
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