WO2013117035A1 - Narrowband interference suppression method and device - Google Patents
Narrowband interference suppression method and device Download PDFInfo
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- WO2013117035A1 WO2013117035A1 PCT/CN2012/073406 CN2012073406W WO2013117035A1 WO 2013117035 A1 WO2013117035 A1 WO 2013117035A1 CN 2012073406 W CN2012073406 W CN 2012073406W WO 2013117035 A1 WO2013117035 A1 WO 2013117035A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
- H04B1/7102—Interference-related aspects the interference being narrowband interference with transform to frequency domain
Definitions
- the present invention relates to the field of communications, and in particular, to a narrowband interference suppression method and apparatus. Background technique
- the CDMA (Code Division Multiple Addressing) system has been widely used.
- the direct-spread CDMA system directly spreads the spectrum of the data sequence to a bandwidth spectrum that is much wider than the demand by pseudo-random codes.
- This spread spectrum processing method allows the DS-CDMA system to have a certain degree of narrow-band interference suppression capability.
- the signal transmission power of the DS-CDMA system is limited. This is especially true in miniaturized base stations such as pico and femeto.
- the narrow-band interference signal is strong enough, the normality of the cell user will be deteriorated. Demodulation performance, reducing cell capacity and coverage, and causing cell congestion in severe cases. Therefore, how to suppress narrow-band interference in a limited spectrum of resources is a problem that cannot be ignored.
- the narrowband interference suppression apparatus in the prior art is mainly classified into a time domain adaptive filter based narrowband interference suppression apparatus and a frequency domain based spectrum conversion processing based narrowband interference suppression apparatus.
- the basic principle of the adaptive filtering-based narrowband interference suppression device in the time domain is: using the difference of the statistical characteristics of the interference and the received spread spectrum signal, using an adaptive algorithm to predict and estimate the interference, and the estimated interference Eliminated from the total signal to achieve the purpose of suppressing interference.
- the basic principle of the frequency domain based spectrum transform based narrowband interference suppression device is: using Fast Fourier Transformation (FFT) to calculate the spectral characteristics of the received signal, and finding the frequency of the interference occurrence in the spectrum, and The frequency is processed accordingly to reduce the effects of interference in the received signal.
- FFT Fast Fourier Transformation
- the narrowband interference suppression apparatus in the prior art needs to perform FFT transformation of the signal to the frequency domain. Then, the spectrum features are obtained, and the signal is filtered in the frequency domain according to the spectral features. Finally, the filtered frequency domain signal is inversely transformed into a time domain signal by FFT, and there are disadvantages: FFT transformation and FFT need to be implemented simultaneously.
- FFT transformation and FFT need to be implemented simultaneously.
- the inverse transform algorithm, and the filtering process in the frequency domain according to the spectral features, is complicated and difficult to implement. Summary of the invention
- the invention provides a narrowband interference suppression method and device, which solves the problem that the narrowband interference suppression algorithm in the prior art is complicated and difficult to implement.
- the present invention adopts the following technical solutions.
- the present invention provides a narrowband interference suppression method, including:
- the digital signal is used for interference suppression.
- the filter unit comprises one or more sets of cascaded notch filters.
- the configuring the filter unit according to the interference detection result is: querying a preset filter coefficient table according to the interference detection result; configuring a coefficient according to the required configuration of the obtained filter Filter unit.
- the digital signal obtained by converting the sampled signal into a frequency domain signal is: converting the sampled digital signal into a frequency domain signal by using an FFT.
- the interference detection result is obtained according to the frequency domain signal, where: the mode of the frequency domain signal is filtered to detect whether there is narrowband interference; and after determining that there is narrowband interference, obtaining narrowband interference Characteristic information, the characteristic information of the narrowband interference is the interference detection result.
- the characteristic information of the narrowband interference includes: an interference frequency and an interference bandwidth.
- the filter coefficient table stores an association relationship between an interference frequency, an interference bandwidth, and a coefficient required for the filter.
- the present invention also provides a narrowband interference suppression apparatus, including: a sampling unit, a time/frequency transform unit, an interference detecting unit, a configuration unit, and a filter unit; wherein the sampling unit is configured to sample an input digital signal
- the time/frequency transform unit is configured to convert the digital signal sampled by the sampling unit into a frequency domain signal
- the interference detecting unit is configured to obtain, according to the frequency domain signal transformed by the time/frequency transform unit, Interference detection result
- the configuration unit is configured to configure the filter unit according to the interference detection result obtained by the interference detection unit
- the filter unit is configured to perform interference suppression on the input digital signal.
- the filter unit comprises one or more sets of cascaded notch filters.
- the configuration unit is specifically configured to: query a preset filter coefficient table according to the interference detection result obtained by the interference detecting unit; and configure a coefficient according to the required configuration of the obtained filter The filter unit.
- the interference detecting unit is specifically configured to: perform filtering processing on a mode of the frequency domain signal transformed by the time/frequency transform unit to detect whether there is narrowband interference; and determine that there is narrowband interference, Obtaining feature information of the narrowband interference, where the characteristic information of the narrowband interference is the interference detection result.
- the present invention provides a narrowband interference suppression method and apparatus.
- the present invention converts a sampled digital signal into a frequency domain signal, and performs interference detection on the frequency domain signal, and then configures a filter unit according to the interference detection result, and uses the filter unit.
- the method of performing interference suppression on the input digital signal does not need to be filtered in the frequency domain according to the spectrum feature as in the prior art, and at the same time, the frequency domain signal is not converted into the time domain signal by the inverse transform. It has the advantages of simple implementation, low difficulty, reliability, and good real-time performance.
- FIG. 1 is a schematic diagram of a receiver provided with a narrowband interference suppression apparatus according to an embodiment of the present invention
- FIG. 2 is a schematic diagram of a narrowband interference suppression apparatus according to an embodiment of the present invention.
- FIG. 3 is a schematic structural diagram of a filter coefficient table according to an embodiment of the present invention.
- FIG. 4 is a flowchart of a narrowband interference suppression method according to an embodiment of the present invention. detailed description
- FIG. 1 is a base station receiver provided with the narrowband interference suppression apparatus provided by an embodiment of the present invention, and the receiver includes: To the receiving unit 11, the digital intermediate frequency processing unit 12, the narrowband interference suppression device 13, and the baseband demodulation processing unit 14, the narrowband interference suppression device 13 is connected to the output of the digital intermediate frequency processing unit 12 and the input of the baseband demodulation processing unit 14. between.
- the processing of the interfering digital signal by the narrowband interference suppression device 13 can effectively enhance the performance of the receiver against narrowband interference.
- the basic idea of the present invention is: real-time detection of narrow-band interference characteristics of a frequency domain signal by transforming a sampled digital signal, and then configuring a filter unit according to the interference detection result, and performing interference suppression on the input digital signal by using the configured filter unit In order to achieve the processing of the interference digital signal, the anti-interference ability of the system is finally realized.
- a narrowband interference suppression apparatus including: a sampling unit 21, a time/frequency transform unit 22, an interference detecting unit 23, a configuration unit 24, and a filter unit 25.
- N data points are sampled from the input digital signal; wherein N is a power of 2, and 512, 1024, etc. may be selected.
- the time/frequency transform unit 22 is configured to perform FFT on the N data points sampled by the sampling unit 21 and convert the signals into frequency domain signals.
- the interference detecting unit 23 is configured to perform a modulo operation on the frequency domain signal obtained by the time/frequency transform unit 22, obtain a mode of the frequency domain signal, and then filter the mode of the frequency domain signal to detect whether there is narrowband interference. If present, acquiring characteristic information such as interference frequency and interference bandwidth of the narrowband interference, the characteristic information of the narrowband interference is the interference detection result of the interference detecting unit 23, and the configuration unit 24 configures the filter unit 25 according to the interference detection result, and simultaneously The interference detection result can be reported to the base station processor.
- the filter unit 25 filters the time domain signal and functions as an interference suppression function for the time domain signal, and may include one or more sets of cascaded notch filters, wherein the notch filter, such as a Notch filter, defaults
- the state is a Bypass state.
- the filter unit 25 does not filter the input baseband digital signal and directly outputs it to the baseband demodulation process.
- the configuration unit 24 queries the filter coefficient table stored in the memory according to the interference frequency and the interference bandwidth obtained by the interference detecting unit 23 to obtain a coefficient required for the corresponding filter configuration, and the configuration unit 24 automatically or manually configures the coefficient to the filter unit.
- the Bypass state is then changed to the active state, at which time the filter unit 25 starts interference suppression on the input baseband digital signal.
- the configuration unit 24 resends a new set of coefficients to the filter unit 25. At this time, only the filter register of the filter unit 25 is updated, and the new interference signal can be performed. Interference suppression.
- FIG. 3 is a schematic diagram of a structure of a filter coefficient table according to an embodiment of the present invention.
- the filter coefficient table stores an association relationship between an interference frequency, an interference bandwidth, and a coefficient required for a filter.
- the spectrum bandwidth of the baseband signal is B
- the interference bandwidth value is selected as the spectrum bandwidth of N, that is: the interference bandwidth can be selected as B/N, 2B/N.
- the interference frequency can be selected as -(2N-1)*B/(2N)
- the interference frequency can be selected as -(N-1)*B/(N) -3*B/(N), -1*B/(N), 0, B/N, 3*B/N (N-1 ) *B/(N); and so on, when the interference bandwidth is selected as B, The interference frequency can only be selected as 0; the corresponding filter coefficients are calculated by the simulation program for various bandwidth and interference frequency conditions, and the filter coefficient table is generated, and the filter coefficient table can be stored in the memory. When looking up the table, you can first query according to the interference bandwidth, and then query according to the interference frequency in the corresponding sub-table to get the final coefficient to be configured.
- the narrowband interference suppression device provided by the present invention can be implemented by being integrated in an FPGA, an ASIC, a high performance DSP device or other processor.
- Fig. 4 shows a flow chart of the method of the present invention, the method comprising the following steps:
- the sampling unit 21 samples N data points from the input digital signal.
- N is a power of 2, and may be selected to be 512, 1024, or the like.
- the time/frequency transform unit 22 performs FFT on the sampled N data points, and transforms into frequency domain signals;
- the interference detecting unit 23 performs a modulo operation on the frequency domain signal to obtain a mode of the frequency domain signal, and then filters the mode of the frequency domain signal to detect whether there is narrowband interference. If yes, it indicates that filtering is required. Go to step S404, otherwise, it means that no filtering process is required, and the process proceeds to step S405.
- the feature information of the narrowband interference is the interference detection result of the interference detecting unit 23, and the interference detection result may also be reported to the base station processor.
- the configuration unit 24 automatically or manually configures the filter unit 25 to be in the Bypass state, so that the digital signal input to the filter unit 25 is directly sent to the output end of the filter unit 25, and returns to step S401.
- the configuration unit 24 performs a lookup according to the interference frequency and the interference bandwidth provided in step S404.
- the filter coefficient table is shown in Figure 3.
- first query according to the interference bandwidth Go to the corresponding sub-table, and then query the coefficient of the required configuration of the current filter unit 25 according to the interference frequency.
- the coefficient of the filter unit 25 is automatically or manually configured by the configuration unit 24, and the mode of the filter unit 25 is configured to be in an active state. At this time, the filter unit 25 starts interference suppression on the input baseband digital signal, and returns to step S401. .
- the sampled digital signal is subjected to FFT, converted into a frequency domain signal, and the mode of the frequency domain signal is filtered to detect whether there is narrowband interference, and if present, the feature information such as the interference frequency and the interference bandwidth is recorded, according to Obtaining characteristic information such as interference frequency and interference bandwidth, obtaining the coefficients required for the current filter unit, performing coefficient configuration on the filter unit according to the coefficient, and configuring the mode of the filter unit to the working state, and finally using the filter unit Interference suppression is performed on the input digital signal.
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Abstract
Description
一种窄带干扰抑制方法及装置 技术领域 Narrowband interference suppression method and device
本发明涉及通信领域， 尤其涉及一种窄带干扰抑制方法及装置。 背景技术 The present invention relates to the field of communications, and in particular, to a narrowband interference suppression method and apparatus. Background technique
在第三代移动通信系统中， 直扩码分多址 （CDMA , Code Division Multiple Addressing )系统得到了广泛的应用。 直扩 CDMA系统通过伪随机 码将数据序列的频谱直接扩展到一个比需求宽得多的带宽频谱上， 这种通 过扩展频谱的处理方式使得直扩 CDMA系统具有一定程度的窄带干扰抑制 能力。 但是， 实际应用中， 直扩 CDMA系统的信号发射功率是受限的， 这 点在 pico和 femeto等小型化基站中尤为突出， 当外界的窄带干扰信号足够 强时， 将会恶化小区用户的正常解调性能， 降低小区容量和覆盖范围， 严 重时还会引起小区阻塞现象。 因此， 在有限的频谱资源中如何抑制窄带干 扰是个不可忽视的问题。 In the third generation mobile communication system, the CDMA (Code Division Multiple Addressing) system has been widely used. The direct-spread CDMA system directly spreads the spectrum of the data sequence to a bandwidth spectrum that is much wider than the demand by pseudo-random codes. This spread spectrum processing method allows the DS-CDMA system to have a certain degree of narrow-band interference suppression capability. However, in practical applications, the signal transmission power of the DS-CDMA system is limited. This is especially true in miniaturized base stations such as pico and femeto. When the narrow-band interference signal is strong enough, the normality of the cell user will be deteriorated. Demodulation performance, reducing cell capacity and coverage, and causing cell congestion in severe cases. Therefore, how to suppress narrow-band interference in a limited spectrum of resources is a problem that cannot be ignored.
现有技术中的窄带干扰抑制装置主要分为时域的基于自适应滤波的窄 带干扰抑制装置和频域的基于频谱变换处理的窄带干扰抑制装置。 其中， 时域的基于自适应滤波的窄带干扰抑制装置的基本原理是： 利用干扰和接 收到的扩频信号的统计特性的不同， 采用自适应算法对干扰进行预测和估 计， 将估计到的干扰从总信号中消除， 从而达到抑制干扰的目的。 频域的 基于频谱变换的窄带干扰抑制装置的基本原理是： 采用快速傅里叶变换 ( FFT, Fast Fourier Transformation )计算接收到的信号的频谱特性, 在频 谱中查找干扰出现的频点， 并对该频点进行相应的处理， 从而降低干扰在 接收信号中的影响。 The narrowband interference suppression apparatus in the prior art is mainly classified into a time domain adaptive filter based narrowband interference suppression apparatus and a frequency domain based spectrum conversion processing based narrowband interference suppression apparatus. The basic principle of the adaptive filtering-based narrowband interference suppression device in the time domain is: using the difference of the statistical characteristics of the interference and the received spread spectrum signal, using an adaptive algorithm to predict and estimate the interference, and the estimated interference Eliminated from the total signal to achieve the purpose of suppressing interference. The basic principle of the frequency domain based spectrum transform based narrowband interference suppression device is: using Fast Fourier Transformation (FFT) to calculate the spectral characteristics of the received signal, and finding the frequency of the interference occurrence in the spectrum, and The frequency is processed accordingly to reduce the effects of interference in the received signal.
现有技术中的窄带干扰抑制装置都需要将信号进行 FFT变换到频域， 然后获取其频谱特征， 按照频谱特征在频域上对信号进行滤波处理， 最后 将滤波处理后的频域信号经过 FFT反变换为时域信号， 存在的不足之处： 需要同时实现 FFT变换和 FFT反变换算法， 且根据频谱特征在频域上进行 滤波处理的这一过程， 比较复杂， 实现难度较大。 发明内容 The narrowband interference suppression apparatus in the prior art needs to perform FFT transformation of the signal to the frequency domain. Then, the spectrum features are obtained, and the signal is filtered in the frequency domain according to the spectral features. Finally, the filtered frequency domain signal is inversely transformed into a time domain signal by FFT, and there are disadvantages: FFT transformation and FFT need to be implemented simultaneously. The inverse transform algorithm, and the filtering process in the frequency domain according to the spectral features, is complicated and difficult to implement. Summary of the invention
本发明提供一种窄带干扰抑制方法及装置， 解决现有技术中窄带干扰 抑制算法复杂， 实现难度大的问题。 The invention provides a narrowband interference suppression method and device, which solves the problem that the narrowband interference suppression algorithm in the prior art is complicated and difficult to implement.
为解决上述技术问题， 本发明采取以下技术方案。 In order to solve the above technical problems, the present invention adopts the following technical solutions.
本发明提供了一种窄带干扰抑制方法， 包括： The present invention provides a narrowband interference suppression method, including:
对输入的数字信号进行采样； 将采样得到的数字信号变换为频域信号； 根据所述频域信号得到干扰检测结果； 根据所述干扰检测结果配置滤波器 单元； 利用所述滤波器单元对输入的数字信号进行干扰抑制。 Sampling the input digital signal; converting the sampled digital signal into a frequency domain signal; obtaining an interference detection result according to the frequency domain signal; configuring a filter unit according to the interference detection result; using the filter unit pair input The digital signal is used for interference suppression.
在本发明一实施例中， 所述滤波器单元包括一组或多组级联的陷波滤 波器。 In an embodiment of the invention, the filter unit comprises one or more sets of cascaded notch filters.
在本发明一实施例中， 所述根据所述干扰检测结果配置滤波器单元， 为： 根据所述干扰检测结果查询预设的滤波器系数表； 根据查得的滤波器 所需配置的系数配置滤波器单元。 In an embodiment of the present invention, the configuring the filter unit according to the interference detection result is: querying a preset filter coefficient table according to the interference detection result; configuring a coefficient according to the required configuration of the obtained filter Filter unit.
在本发明一实施例中， 所述将采样得到的数字信号变换为频域信号， 为： 采用 FFT将采样得到的数字信号变换为频域信号。 In an embodiment of the invention, the digital signal obtained by converting the sampled signal into a frequency domain signal is: converting the sampled digital signal into a frequency domain signal by using an FFT.
在本发明一实施例中， 所述根据所述频域信号得到干扰检测结果， 为： 对所述频域信号的模进行滤波处理， 检测是否存在窄带干扰； 确定存在窄 带干扰后， 获取窄带干扰的特征信息， 所述窄带干扰的特征信息为所述干 扰检测结果。 In an embodiment of the present invention, the interference detection result is obtained according to the frequency domain signal, where: the mode of the frequency domain signal is filtered to detect whether there is narrowband interference; and after determining that there is narrowband interference, obtaining narrowband interference Characteristic information, the characteristic information of the narrowband interference is the interference detection result.
在本发明一实施例中， 所述窄带干扰的特征信息包括： 干扰频率和干 扰带宽。 在本发明一实施例中， 所述滤波器系数表保存有干扰频率、 干扰带宽 及滤波器所需配置的系数的关联关系。 In an embodiment of the invention, the characteristic information of the narrowband interference includes: an interference frequency and an interference bandwidth. In an embodiment of the invention, the filter coefficient table stores an association relationship between an interference frequency, an interference bandwidth, and a coefficient required for the filter.
本发明还提供了一种窄带干扰抑制装置， 包括： 采样单元、 时 /频变换 单元、 干扰检测单元、 配置单元和滤波器单元； 其中， 所述采样单元， 用 于对输入的数字信号进行采样； 所述时 /频变换单元， 用于将所述采样单元 采样得到的数字信号变换为频域信号； 所述干扰检测单元， 用于根据所述 时 /频变换单元变换后的频域信号得到干扰检测结果； 所述配置单元， 用于 根据所述干扰检测单元得到的干扰检测结果配置所述滤波器单元； 所述滤 波器单元用于对输入的数字信号进行干扰抑制。 The present invention also provides a narrowband interference suppression apparatus, including: a sampling unit, a time/frequency transform unit, an interference detecting unit, a configuration unit, and a filter unit; wherein the sampling unit is configured to sample an input digital signal The time/frequency transform unit is configured to convert the digital signal sampled by the sampling unit into a frequency domain signal, and the interference detecting unit is configured to obtain, according to the frequency domain signal transformed by the time/frequency transform unit, Interference detection result; the configuration unit is configured to configure the filter unit according to the interference detection result obtained by the interference detection unit; and the filter unit is configured to perform interference suppression on the input digital signal.
在本发明一实施例中， 所述滤波器单元包括一组或多组级联的陷波滤 波器。 In an embodiment of the invention, the filter unit comprises one or more sets of cascaded notch filters.
在本发明一实施例中， 所述配置单元， 具体用于： 根据所述干扰检测 单元得到的干扰检测结果查询预设的滤波器系数表； 根据查得的滤波器所 需配置的系数配置所述滤波器单元。 In an embodiment of the present invention, the configuration unit is specifically configured to: query a preset filter coefficient table according to the interference detection result obtained by the interference detecting unit; and configure a coefficient according to the required configuration of the obtained filter The filter unit.
在本发明一实施例中， 所述干扰检测单元， 具体用于： 对所述时 /频变 换单元变换后的频域信号的模进行滤波处理， 检测是否存在窄带干扰； 确 定存在窄带干扰后， 获取窄带干扰的特征信息， 所述窄带干扰的特征信息 为所述干扰检测结果。 In an embodiment of the present invention, the interference detecting unit is specifically configured to: perform filtering processing on a mode of the frequency domain signal transformed by the time/frequency transform unit to detect whether there is narrowband interference; and determine that there is narrowband interference, Obtaining feature information of the narrowband interference, where the characteristic information of the narrowband interference is the interference detection result.
本发明提供一种窄带干扰抑制方法及装置， 本发明在将采样得到的数 字信号变换为频域信号， 对频域信号进行干扰检测之后， 采用根据干扰检 测结果配置滤波器单元， 利用滤波器单元对输入的数字信号进行干扰抑制 的方式， 不需要如现有技术根据频谱特征在频域上滤波的过程， 同时， 还 不需要经过反变换的方式再将频域信号变换为时域信号。 具有实现简单、 难度低、 可靠、 实时性好等优点。 附图说明 The present invention provides a narrowband interference suppression method and apparatus. The present invention converts a sampled digital signal into a frequency domain signal, and performs interference detection on the frequency domain signal, and then configures a filter unit according to the interference detection result, and uses the filter unit. The method of performing interference suppression on the input digital signal does not need to be filtered in the frequency domain according to the spectrum feature as in the prior art, and at the same time, the frequency domain signal is not converted into the time domain signal by the inverse transform. It has the advantages of simple implementation, low difficulty, reliability, and good real-time performance. DRAWINGS
图 1 为设置有本发明一实施例提供的窄带干扰抑制装置的接收机的示 意图； 1 is a schematic diagram of a receiver provided with a narrowband interference suppression apparatus according to an embodiment of the present invention;
图 2为本发明一实施例提供的窄带干扰抑制装置的示意图； 2 is a schematic diagram of a narrowband interference suppression apparatus according to an embodiment of the present invention;
图 3为本发明一实施例提供的滤波器系数表的结构示意图； 3 is a schematic structural diagram of a filter coefficient table according to an embodiment of the present invention;
图 4为本发明一实施例提供的窄带干扰抑制方法的流程图。 具体实施方式 FIG. 4 is a flowchart of a narrowband interference suppression method according to an embodiment of the present invention. detailed description
下面通过具体实施方式结合附图对本发明作进一步详细说明。 The present invention will be further described in detail below with reference to the accompanying drawings.
本发明提供的窄带干扰抑制装置位于数字中频处理之后， 基带解调处 理之前， 图 1 为设置有本发明一实施例提供的窄带干扰抑制装置的基站接 收机， 该接收机包括： 依次相连的反向接收单元 11、数字中频处理单元 12、 窄带干扰抑制装置 13和基带解调处理单元 14, 窄带干扰抑制装置 13连接 在数字中频处理单元 12的输出端与基带解调处理单元 14的输入端之间。 通过该窄带干扰抑制装置 13对干扰数字信号的处理， 可以有效增强接收机 抗窄带干扰的性能。 The narrowband interference suppression apparatus provided by the present invention is located after the digital intermediate frequency processing, and before the baseband demodulation processing, FIG. 1 is a base station receiver provided with the narrowband interference suppression apparatus provided by an embodiment of the present invention, and the receiver includes: To the receiving unit 11, the digital intermediate frequency processing unit 12, the narrowband interference suppression device 13, and the baseband demodulation processing unit 14, the narrowband interference suppression device 13 is connected to the output of the digital intermediate frequency processing unit 12 and the input of the baseband demodulation processing unit 14. between. The processing of the interfering digital signal by the narrowband interference suppression device 13 can effectively enhance the performance of the receiver against narrowband interference.
本发明的基本思想是： 通过对采样数字信号变换得到频域信号的窄带 干扰特征的实时检测， 然后根据干扰检测结果配置滤波器单元， 利用配置 后的滤波器单元对输入的数字信号进行干扰抑制， 从而达到对干扰数字信 号的处理， 最终实现系统抗干扰能力。 The basic idea of the present invention is: real-time detection of narrow-band interference characteristics of a frequency domain signal by transforming a sampled digital signal, and then configuring a filter unit according to the interference detection result, and performing interference suppression on the input digital signal by using the configured filter unit In order to achieve the processing of the interference digital signal, the anti-interference ability of the system is finally realized.
图 2为本发明一实施例提供的窄带干扰抑制装置， 包括： 采样单元 21、 时 /频变换单元 22、 干扰检测单元 23、 配置单元 24和滤波器单元 25。 2 is a narrowband interference suppression apparatus according to an embodiment of the present invention, including: a sampling unit 21, a time/frequency transform unit 22, an interference detecting unit 23, a configuration unit 24, and a filter unit 25.
采样单元 21用于数字中频处理之后 ,从输入的数字信号中采样 N个数 据点； 其中， N为 2的幂次， 可选择为 512、 1024等。 After the sampling unit 21 is used for digital intermediate frequency processing, N data points are sampled from the input digital signal; wherein N is a power of 2, and 512, 1024, etc. may be selected.
时 /频变换单元 22用于将采样单元 21采样得到的 N个数据点进行 FFT, 变换为频域信号。 干扰检测单元 23用于对时 /频变换单元 22变换后得到的频域信号进行 取模操作， 得到频域信号的模， 再对该频域信号的模进行滤波处理， 检测 是否存在窄带干扰， 若存在， 则获取窄带干扰的干扰频率和干扰带宽等特 征信息， 该窄带干扰的特征信息为干扰检测单元 23的干扰检测结果， 配置 单元 24根据该干扰检测结果对滤波器单元 25进行配置， 同时可上报该干 扰检测结果给基站处理器。 The time/frequency transform unit 22 is configured to perform FFT on the N data points sampled by the sampling unit 21 and convert the signals into frequency domain signals. The interference detecting unit 23 is configured to perform a modulo operation on the frequency domain signal obtained by the time/frequency transform unit 22, obtain a mode of the frequency domain signal, and then filter the mode of the frequency domain signal to detect whether there is narrowband interference. If present, acquiring characteristic information such as interference frequency and interference bandwidth of the narrowband interference, the characteristic information of the narrowband interference is the interference detection result of the interference detecting unit 23, and the configuration unit 24 configures the filter unit 25 according to the interference detection result, and simultaneously The interference detection result can be reported to the base station processor.
滤波器单元 25对时域信号进行滤波,起到对时域信号的干扰抑制功能， 可以包括一组或多组级联的陷波滤波器， 其中， 陷波滤波器如 Notch滤波 器， 其默认状态为不选通（Bypass )状态， 此时滤波器单元 25对输入的基 带数字信号不进行滤波， 直接输出给基带解调处理。 配置单元 24根据干扰 检测单元 23 得到的干扰频率和干扰带宽查询存储器中存储的滤波器系数 表， 得到相应的滤波器所需配置的系数， 配置单元 24自动或人工将该系数 配置到滤波器单元 25的相应系数寄存器中，然后将 Bypass状态变更为工作 状态， 此时滤波器单元 25开始对输入的基带数字信号进行干扰抑制。 当干 扰信号的窄带干扰特征信息发生改变后， 配置单元 24重新送一组新的系数 给滤波器单元 25, 此时只需更新滤波器单元 25的滤波器寄存器， 就可以对 新的干扰信号进行干扰抑制。 The filter unit 25 filters the time domain signal and functions as an interference suppression function for the time domain signal, and may include one or more sets of cascaded notch filters, wherein the notch filter, such as a Notch filter, defaults The state is a Bypass state. At this time, the filter unit 25 does not filter the input baseband digital signal and directly outputs it to the baseband demodulation process. The configuration unit 24 queries the filter coefficient table stored in the memory according to the interference frequency and the interference bandwidth obtained by the interference detecting unit 23 to obtain a coefficient required for the corresponding filter configuration, and the configuration unit 24 automatically or manually configures the coefficient to the filter unit. In the corresponding coefficient register of 25, the Bypass state is then changed to the active state, at which time the filter unit 25 starts interference suppression on the input baseband digital signal. After the narrowband interference characteristic information of the interference signal is changed, the configuration unit 24 resends a new set of coefficients to the filter unit 25. At this time, only the filter register of the filter unit 25 is updated, and the new interference signal can be performed. Interference suppression.
图 3 为本发明一实施例提供的滤波器系数表的结构， 该滤波器系数表 保存有干扰频率、 干扰带宽及滤波器所需配置的系数的关联关系。 为了减 小表中数据量， 从而缩短查表时间， 假设基带信号频谱带宽为 B, 将干扰 带宽值选为频谱带宽为 N等分， 即： 干扰带宽可选择为 B/N、 2B/N FIG. 3 is a schematic diagram of a structure of a filter coefficient table according to an embodiment of the present invention. The filter coefficient table stores an association relationship between an interference frequency, an interference bandwidth, and a coefficient required for a filter. In order to reduce the amount of data in the table and shorten the table lookup time, assume that the spectrum bandwidth of the baseband signal is B, and the interference bandwidth value is selected as the spectrum bandwidth of N, that is: the interference bandwidth can be selected as B/N, 2B/N.
B。 当干扰带宽选择为 B/N 时， 干扰频率可选择为 -(2N-1)*B/(2N) B. When the interference bandwidth is selected as B/N, the interference frequency can be selected as -(2N-1)*B/(2N)
-3*B/(2N)、 -1*B/(2N)、 0、 B/2N、 3*B/2N (2N-1)*B/(2N); 干扰带宽 选择为 2B/N时， 干扰频率可选择为 -(N-1)*B/(N) -3*B/(N)、 -1*B/(N)、 0、 B/N, 3*B/N (N-1)*B/(N); 以此类推， 当干扰带宽选择为 B 时， 干扰频率只可选择为 0;再通过仿真程序针对各种带宽和干扰频率情况计算 出相应的滤波器系数， 生成该滤波器系数表， 该滤波器系数表可存储于存 储器内。 查表时， 可先根据干扰带宽查询， 然后在对应的子表中根据干扰 频率查询， 得到最终需配置的系数。 -3*B/(2N), -1*B/(2N), 0, B/2N, 3*B/2N (2N-1)*B/(2N); When the interference bandwidth is selected as 2B/N, The interference frequency can be selected as -(N-1)*B/(N) -3*B/(N), -1*B/(N), 0, B/N, 3*B/N (N-1 ) *B/(N); and so on, when the interference bandwidth is selected as B, The interference frequency can only be selected as 0; the corresponding filter coefficients are calculated by the simulation program for various bandwidth and interference frequency conditions, and the filter coefficient table is generated, and the filter coefficient table can be stored in the memory. When looking up the table, you can first query according to the interference bandwidth, and then query according to the interference frequency in the corresponding sub-table to get the final coefficient to be configured.
本发明提供的窄带干扰抑制装置可以集成在 FPGA、 ASICs, 高性能 DSP器件或其它处理器中实现。 The narrowband interference suppression device provided by the present invention can be implemented by being integrated in an FPGA, an ASIC, a high performance DSP device or other processor.
基于上述的窄带干扰抑制装置， 本发明还提供了一种窄带干扰抑制方 法， 图 4给出了本发明所述方法的流程图， 该方法包括以下步驟： Based on the narrowband interference suppression apparatus described above, the present invention also provides a narrowband interference suppression method, and Fig. 4 shows a flow chart of the method of the present invention, the method comprising the following steps:
S401、 采样单元 21从输入的数字信号中采样 N个数据点； S401. The sampling unit 21 samples N data points from the input digital signal.
这里， N为 2的幂次， 可选择为 512、 1024等。 Here, N is a power of 2, and may be selected to be 512, 1024, or the like.
5402、 时 /频变换单元 22对采样得到的 N个数据点进行 FFT, 变换为 频域信号； 5402, the time/frequency transform unit 22 performs FFT on the sampled N data points, and transforms into frequency domain signals;
5403、 干扰检测单元 23对该频域信号进行取模操作， 得到频域信号的 模， 再对该频域信号的模进行滤波处理， 检测是否存在窄带干扰， 若存在， 则表明需要进行滤波处理， 进入步驟 S404, 否则， 表示不需要进行滤波处 理， 进入步驟 S405。 5403. The interference detecting unit 23 performs a modulo operation on the frequency domain signal to obtain a mode of the frequency domain signal, and then filters the mode of the frequency domain signal to detect whether there is narrowband interference. If yes, it indicates that filtering is required. Go to step S404, otherwise, it means that no filtering process is required, and the process proceeds to step S405.
5404、 获取干扰频率和干扰带宽等特征信息， 用作后续步驟中查表用， 该窄带干扰的特征信息为干扰检测单元 23的干扰检测结果， 同时还可上报 该干扰检测结果给基站处理器。 5404. Acquire feature information such as the interference frequency and the interference bandwidth, and use it as a lookup table in a subsequent step. The feature information of the narrowband interference is the interference detection result of the interference detecting unit 23, and the interference detection result may also be reported to the base station processor.
5405、 当前不存在干扰， 由配置单元 24自动或人工配置滤波器单元 25 为 Bypass状态， 使得输入滤波器单元 25的数字信号直接送至滤波器单元 25的输出端， 返回步驟 S401。 5405. Currently, there is no interference, and the configuration unit 24 automatically or manually configures the filter unit 25 to be in the Bypass state, so that the digital signal input to the filter unit 25 is directly sent to the output end of the filter unit 25, and returns to step S401.
S406: 配置单元 24根据步驟 S404提供的干扰频率和干扰带宽进行查 表； S406: The configuration unit 24 performs a lookup according to the interference frequency and the interference bandwidth provided in step S404.
这里， 该滤波器系数表如图 3 所示。 在查表时， 先根据干扰带宽查询 到相应的子表， 然后再根据干扰频率查询得到当前滤波器单元 25所需配置 的系数。 Here, the filter coefficient table is shown in Figure 3. When looking up the table, first query according to the interference bandwidth. Go to the corresponding sub-table, and then query the coefficient of the required configuration of the current filter unit 25 according to the interference frequency.
S407、 由配置单元 24 自动或人工配置滤波器单元 25的系数， 并将滤 波器单元 25的模式配置为工作状态， 此时滤波器单元 25开始对输入的基 带数字信号进行干扰抑制， 返回步驟 S401。 S407. The coefficient of the filter unit 25 is automatically or manually configured by the configuration unit 24, and the mode of the filter unit 25 is configured to be in an active state. At this time, the filter unit 25 starts interference suppression on the input baseband digital signal, and returns to step S401. .
本实施例将采样得到的数字信号进行 FFT, 变换为频域信号， 取该频 域信号的模进行滤波处理， 检测是否存在窄带干扰， 若存在， 则记录干扰 频率和干扰带宽等特征信息， 根据干扰频率和干扰带宽等特征信息查表， 得到当前滤波器单元所需配置的系数， 根据该系数对滤波器单元进行系数 配置， 并将滤波器单元的模式配置为工作状态， 最后利用滤波器单元对输 入的数字信号进行干扰抑制。 不需要如现有技术根据频谱特征在频域上滤 波的过程， 同时， 还不需要经过反变换的方式再将频域信号变换为时域信 号。 具有实现简单、 难度低、 可靠、 实时性好等优点。 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。 In this embodiment, the sampled digital signal is subjected to FFT, converted into a frequency domain signal, and the mode of the frequency domain signal is filtered to detect whether there is narrowband interference, and if present, the feature information such as the interference frequency and the interference bandwidth is recorded, according to Obtaining characteristic information such as interference frequency and interference bandwidth, obtaining the coefficients required for the current filter unit, performing coefficient configuration on the filter unit according to the coefficient, and configuring the mode of the filter unit to the working state, and finally using the filter unit Interference suppression is performed on the input digital signal. There is no need for a process of filtering in the frequency domain according to spectral features as in the prior art, and at the same time, it is not necessary to inversely transform the frequency domain signal into a time domain signal. It has the advantages of simple implementation, low difficulty, reliability, and good real-time performance. It is to be understood that the specific embodiments of the invention are limited only by the description. It is to be understood by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.
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| US9212212B2 (en) | 2006-06-21 | 2015-12-15 | The Regents Of The University Of Colorado, A Body Corporate | Targeting complement factor H for treatment of diseases |
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