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CN102404271B - Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver - Google Patents

Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver Download PDF

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CN102404271B
CN102404271B CN 201110375806 CN201110375806A CN102404271B CN 102404271 B CN102404271 B CN 102404271B CN 201110375806 CN201110375806 CN 201110375806 CN 201110375806 A CN201110375806 A CN 201110375806A CN 102404271 B CN102404271 B CN 102404271B
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frequency
method
narrowband
interference
multiplexing
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CN102404271A (en )
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傅瑞锦
杨华
胡泽伟
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广东盛路通信科技股份有限公司
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Abstract

本发明公开了一种OFDM接收机的窄带干扰抑制装置及方法,该装置位于OFDM接收链路上,介于中频处理模块和基带处理模块之间,其特征在于,它包括依次连接的窄带干扰搜索模块、数字陷波滤波器系数产生模块和时域数字陷波滤波器模块;该方法包括首先对输入OFDM接收机数字信号进行快速傅里叶变换得到输入信号频谱特征,然后根据设定门限值来判断输入信号是否存在窄带干扰及其干扰特征,接着根据干扰特征查询预置的滤波器系数表获得滤波器系数,最后将滤波器系数配置于时域数字陷波滤波器中,这样输入OFDM接收机数字信号通过该滤波器后就输出了滤除窄带干扰后的信号,从而提高OFDM解调系统抗窄带干扰的性能。 The present invention discloses a narrowband interference in an OFDM receiver apparatus and method of inhibiting means is positioned at an OFDM receiver link between the intermediate frequency processing module and a baseband processing module is interposed, characterized in that it comprises sequentially connected searches narrowband interference module, digital notch filter coefficient generation module and a time domain digital notch filter module; the process comprises first digital signal input OFDM receiver performs fast Fourier transform of the input signal spectral characteristics, and according to the set threshold value narrowband interference and determines whether the input signal wherein the interference is present, then the query to obtain the filter coefficients preset filter coefficient table based on the interference characteristics, the final filter coefficients arranged in the time domain digital notch filter, so that the input OFDM reception machine filter after the digital signal output by the signal filtered narrowband interference, narrowband interference suppression to improve the performance of OFDM demodulation system.

Description

一种OFDM接收机的窄带干扰抑制装置及方法 Apparatus and method in an OFDM receiver narrowband interference suppression

技术领域 FIELD

[0001] 本发明涉及通信技术领域,更具体的是涉及一种0FDM接收机的窄带干扰抑制装置和方法。 [0001] The present invention relates to communication technologies, and more particularly relates to an apparatus and method for narrowband interference suppression 0FDM receiver.

背景技术 Background technique

[0002] OFDM (Orthogonal Frequency Division Multiplexing,正交频分复用)为一种调制技术,利用多载波的传送方式,将一数据串通过低传输速率的子载波来传送。 [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) as a modulation technique, using a multi-carrier transmission system, to a low data transfer rate collusion subcarriers to transmit. 0FDM技术采用一种不连续的多音调制技术,将不同频率的载波中的大量信号合并成单一信号,完成信号传送。 0FDM technique uses a discrete multi-tone modulation technique, a large number of the combined carrier signals of different frequencies into a single signal, completion signal. 0FDM技术发展是为了提高载波的频谱利用率,其特点是各子载波相互正交,于是扩频调制后的频谱可以相互重叠,因而减小子载波之间的相互干扰。 0FDM technology is to improve spectrum efficiency carrier, characterized by each sub-carrier orthogonal to each other so the spread spectrum modulation spectrum may overlap with each other, thus reducing the mutual interference between subcarriers. WiMAX通信系统就是基于0FDM调制技术的通信系统。 WiMAX communication system is a communication system based 0FDM modulation techniques.

[0003] 使用0FDM的重要关键之一是可增加抵抗频率选择性衰落能力,同时也增加了抵制窄带干扰的能力。 One of the important key [0003] use 0FDM is to increase the ability to resist frequency selective fading, while also increasing the ability to resist narrow-band interference. 但是0FDM系统自身能够抗窄带干扰的条件是假设0FDM信号的功率与窄带干扰相比大得多;然而实际应用中,0FDM信号的发射功率是受限的(这点在PIC0或者FEMT0等小型化基站中尤为突出),这样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。 However, the system itself can be 0FDM Narrowband interference condition is assumed that the power of narrowband interference signals compared to larger 0FDM; however, the practical application, the transmit power is limited 0FDM signal (in this downsizing PIC0 station or the like FEMT0 particularly prominent), so that when the external narrowband interference signal is strong enough to worsen a normal cell user demodulation performance, reducing the cell capacity and coverage, a cell can also cause severe blocking phenomenon. 因此在有限的频谱资源中如何抑制窄带干扰是不可忽视的问题。 So how to suppress narrowband interference in the limited spectrum resources can not be ignored.

[0004] 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装置和频域的基于频谱变换处理的窄带干扰抑制装置。 [0004] The prior art narrowband interference suppression device is divided into narrowband interference suppression based on adaptive filtering apparatus of narrowband interference and frequency-domain based spectral conversion processing apparatus in the time domain. 其中时域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0FDM信号的统计特性的不同,采用自适应算法对于干扰进行预测和估计,并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。 Wherein the basic principle of the time-domain adaptive filtering narrow band interference suppression means are: using different statistical properties of interference and the received signal 0FDM, and adaptive predictive algorithm for estimating the interference, and the interference estimate from the total signal is eliminated, so as to achieve the purpose of suppressing interference. 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FFT变换计算接收到的信号频谱特性,在频域中查找干扰出现的频点,并在频域上对该干扰频点进行相应的处理, 从而降低干扰对接收信号解调的影响。 The basic principle of narrowband interference suppression means based on a frequency domain spectrum transform processing is: calculated using the FFT spectral characteristics of the received signal to find the frequency interference occurs in the frequency domain, and the frequency interference in the frequency domain corresponding treatment, to reduce the influence of interference on the received signal demodulated.

[0005] 现有的相关专利文献为专利申请号CN200710152170. 1,发明名称为减缓正交分频多工接收机窄带干扰的方法,该专利申请抑制窄带干扰的方法采用频域干扰增益抑制方法,将信号进行FFT变换(快速傅里叶变换)到频域。 [0005] The method of Patent Document related to the prior Patent Application No. CN200710152170. 1, title of the invention a method of multiplexing receiver narrowband interference mitigation is Orthogonal Frequency Division this patent application narrowband interference suppression gain frequency domain interference suppression method, the signal FFT transform (fast Fourier transform) to the frequency domain. 接着按照设置的判决门限来确定窄带干扰,然后在信号频谱上对干扰频谱进行衰减实现干扰抑制功能,最后将处理后的频域信号经过FFT反变换为时域信号。 Then follow the decision threshold provided to determine the narrowband interference, and attenuation for interference suppression of the interference spectrum in the signal spectrum, and finally the frequency domain signal after the inverse transform from the FFT processing time domain signal. 现有专利存在不足之处: Existing patents exist shortcomings:

[0006] (1)、需要同时实现FFT变换和FFT反变换算法,比较复杂。 [0006] (1) need to implement FFT and inverse FFT transform algorithm, is more complex. 实现难度较大。 More difficult to achieve.

[0007] (2)、实时性差。 [0007] (2) real-time difference.

发明内容 SUMMARY

[0008] 本发明的目的就是为了解决现有技术之不足而提供的一种实现简单可靠、实时性好的优点,具有很好的市场竞争力的0FDM接收机的窄带干扰抑制装置。 [0008] The object of the present invention is an implementation of the prior art to solve the problem of providing a simple, reliable, real-time good advantage, narrowband interference 0FDM receiver having good competitive inhibition means.

[0009] 本发明的另一目的是提供一种实现简单可靠、实时性好的优点,具有很好的市场竞争力的OFDM接收机的窄带干扰抑制方法。 [0009] Another object of the present invention is to provide a simple, reliable, real-time good advantage, narrowband interference OFDM receiver having good competitive inhibition methods.

[0010] 本发明是采用如下技术解决方案来实现上述目的:一种0FDM接收机的窄带干扰抑制装置,该装置位于0FDM接收链路上,介于中频处理模块和基带处理模块之间,本装置包括窄带干扰搜索模块、数字陷波滤波器系数产生模块和时域数字陷波滤波器模块,其中: [0010] The present invention adopts the following technical solution to achieve the above object: Narrowband Interference suppression 0FDM receiver means positioned on 0FDM receiving link between the processing module and an intermediate frequency between a baseband processing module, the apparatus search module comprises a narrowband interference, the digital notch filter coefficient generation module and a time domain digital notch filter module, wherein:

[0011]窄带干扰搜索模块用于对输入基带信号进行快速傅里叶变换(FFT)分析,根据信号频谱特征获取产生数字陷波滤波器系数所需的窄带干扰频率及其干扰带宽。 [0011] The search module for narrow-band interference baseband signal is input to the fast Fourier transform (FFT) analysis, acquiring generating digital notch narrowband interference and the interference frequency bandwidth required filter coefficients based on the signal spectral characteristics.

[0012] 数字陷波滤波器系数产生模块:根据窄带干扰搜索模块获取的窄带干扰特征(干扰频率和干扰带宽)通过查表方式快速获得时域数字陷波滤波器系数。 [0012] The digital notch filter coefficient generation module: Fast obtain time-domain digital notch filter coefficient look-up table according to the embodiment wherein narrow-band interference (interference bandwidths and interference frequency) acquired search module narrowband interference.

[0013] 时域数字陷波滤波器模块:该滤波器的系数由数字陷波滤波器系数产生模块配置,输入的基带信号通过该配置完成的时域数字陷波滤波器模块后即输出滤除窄带干扰的基带信号。 [0013] The time domain digital notch filter module: coefficients of the notch filter by a digital filter coefficient generation module configuration, the time-domain digital baseband signal inputted through the complete configuration after the output of notch filter module filtered narrowband interference baseband signal.

[0014] 本发明还提供了一种利用所述装置实现对窄带干扰抑制的方法,整个实现方法包括如下几个部分: [0014] The present invention further provides a method of using the device-implemented method for narrowband interference suppression, overall implemented method comprising the following parts:

[0015] (1)、获取输入基带信号频谱:对输入的基带信号进行快速傅里叶变换,获取输入基带信号频谱; [0015] (1), the input baseband signals acquired spectrum: input baseband signal fast Fourier transform, obtaining input baseband signal spectrum;

[0016] (2)、确定窄带干扰特征(干扰频率和干扰带宽):对获取的输入基带信号频谱的模进行平滑滤波处理后,根据设置的门限来获取窄带干扰频率和干扰带宽; [0016] (2), characterized in determining the narrowband interference (interference bandwidths and interference frequency): After the input of the analog baseband signal spectrum acquired smoothing filter processing to obtain interference and narrowband interference frequency bandwidth according to the set threshold;

[0017] (3)、确定滤波器系数:根据窄带干扰的干扰频率和干扰带宽,通过查表选择相匹配的滤波器系数(该滤波器系数表由仿真工具给出并存储于设备存储中); [0017] (3), determining filter coefficients: The interference frequency bandwidth of the interference and narrowband interference, by look-up table that matches the selected filter coefficient (the filter coefficient table is given by the simulation tool and stored in the storage device) ;

[0018] (4)、配置滤波器:将所获得的滤波器系数配置到时域数字陷波滤波器模块中。 [0018] (4), the filter configuration: configuring the filter coefficients to the time domain obtained digital notch filter module.

[0019] 在所述步骤(2)中,窄带干扰判断方法包括:对频域信号的模进行平滑滤波处理, 然后根据设定的们限制值检测窄带干扰情况,大于门限值为存在窄带干扰,否则为不存在干扰。 [0019] In the step (2), the narrow-band interference determination method comprising: analog frequency domain signal smoothing filter process, and according to the set limit values ​​are detected narrowband interference situation, there is greater than the threshold narrowband interference otherwise there is no interference.

[0020] 在所述步骤(2)中,窄带干扰特征获取方法包括:在存在干扰的情况下,获取窄带干扰频率和干扰带宽;由门限值与频谱信号交叉的两个点之间数据点的中间点获取干扰频率,由门限值与频谱信号交叉的两个点之间数据点个数获取干扰带宽。 [0020] In the step (2), characterized in narrowband interference acquiring method comprising: in the presence of interference, narrowband interference obtain bandwidths and interference frequency; crossing points between the two data points from the spectrum signal with the threshold value the intermediate point obtaining interference frequency, number of data points acquired interference bandwidth between two points crossing the threshold of a signal spectrum.

[0021] 在所述步骤(3)中,所述查询滤波器系数包括:提供的窄带干扰频率和干扰带宽进行查表,先根据干扰带宽查询到相应的子表,然后在根据干扰频率查询该子表得到当前时域数字陷波滤波器所需的配置系数。 [0021] In the step (3), the filter coefficients of the query comprising: a narrow-band interference and interference frequency bandwidth provided look-up table, the first query to the corresponding sub table based on the interference bandwidth and the interference in the frequency of the query sub-table arranged to obtain the current coefficients of the desired time domain digital notch filter.

[0022] 在所述步骤(4)中,所述时域数字陷波滤波器配置包括: [0022] In the step (4), said time domain digital notch filter arrangement comprising:

[0023] 当不存在干扰时,需要设置时域数字陷波滤波器模块为Bypass模式,使得输入到时域数字陷波滤波器单元的数字信号直接送至时域数字陷波滤波器单元的输出; [0023] When there is no interference, needs to set the time-domain digital notch filter module Bypass mode, so that the digital signal input to the digital notch filter unit domain directly to the time domain digital output of the notch filter means ;

[0024]当存在干扰时,更新时域数字陷波滤波器系数,并将该滤波器模式设置为工作模式,此时输出的信号为滤波后信号。 [0024] When interference is present, the time domain digital notch filter update coefficient, and sets the filter mode to the active mode, when the output signal is a filtered signal.

[0025] 本发明采用上述技术解决方案所能达到的有益效果是: [0025] The present invention adopts the above technical solution can achieve beneficial effects:

[0026] 本发明采用一种基于时域数字陷波滤波器的0FDM接收机窄带干扰抑制装置和方法,具有实现简单可靠、实时性好的优点,具有很好的市场竞争力。 [0026] The present invention uses a receiver 0FDM narrowband interference based on a time-domain digital notch filter apparatus and method for suppressing, with simple, reliable, real-time advantages of good, has good market competitiveness.

附图说明 BRIEF DESCRIPTION

[0027] 图1是本发明提供的窄带干扰抑制装置在OFDM接收机中的实现位置图; [0027] FIG 1 is implemented in the apparatus of FIG positions in an OFDM receiver of the present invention provides a narrowband interference suppression;

[0028] 图2是本发明提供的窄带干扰抑制装置的实现结构图; [0028] FIG. 2 is a block diagram of apparatus to achieve narrowband interference suppression provided by the present invention;

[0029] 图3是本发明所述方法的实现流程图。 [0029] FIG. 3 is a flow chart for implementing the method of the invention.

[0030] 附图标记说明:201、窄带干扰搜索单元202、时域数字陷波滤波器产生单元203、时域数字陷波滤波器产生单元。 [0030] REFERENCE NUMERALS: 201, narrowband interference search unit 202, a time domain digital notch filter generation unit 203, a time domain digital notch filter generating unit.

具体实施方式 detailed description

[0031] 下面结合附图对本发明的技术方案进行具体的描述。 [0031] Next, the technical solution of the present invention will be specifically described in conjunction with the drawings.

[0032] 图1为本发明提供的窄带干扰抑制装置在0FDM接收机中的实现位置图。 FIG achieve a position receiver means 0FDM [0032] FIG 1 the present invention provides the narrowband interference suppression. 由图可知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。 After the narrowband interference can be seen from FIG suppressing apparatus of the present invention to provide a digital IF processing is located, prior to baseband demodulation processing. 通过该装置对窄带干扰信号的处理可以有效增强0FDM接收机抗窄带干扰的能力。 By this means the processing of the narrowband interferers can effectively enhance the ability of the receiver 0FDM narrowband interference suppression.

[0033] 本发明提供的装置具体实施方案如图2所示,包括窄带干扰搜索单元201、时域数字陷波滤波器产生单元202和时域数字陷波滤波器单元203。 [0033] The apparatus of the present invention provides a particular embodiment shown in Figure 2, comprises a narrowband interference search unit 201, a time domain digital notch filter generating unit 202 and a time domain digital notch filter unit 203.

[0034] 所述窄带干扰搜索单元201首先对输入的基带数字信号进行快速傅里叶变换处理,得到频域信号的模,然后对频域信号模进行平滑滤波处理,通过设定的门限值来确定当前信号中是否存在窄带干扰,如果存在窄带干扰则获取所需抑制的干扰频率和干扰带宽等特征信息,用于时域数字陷波滤波器产生单元,同时可上报检测结果给基站处理器。 [0034] The search unit 201 first narrowband interference baseband signal inputted digital fast Fourier transform processing, frequency-domain signal obtained mold, and then molding the frequency domain signal smoothing filter processing by setting a threshold value determining whether the presence of narrowband interference in the current signal, if narrowband interference is present is acquired disturbance frequency bandwidth characteristic and interference suppression information required for time-domain digital notch filter generating unit, while the base station reports the detection result to the processor .

[0035] 所述时域数字陷波滤波器系数产生单元202根据窄带干扰搜索单元提供的窄带干扰频率和干扰带宽等特征信息查询存储中的滤波器系数表,得到相应的滤波器系数,送至时域数字陷波滤波器单元进行系数配置。 [0035] The time-domain digital notch filter coefficient generating unit 202 according to the frequency of narrowband interference and narrowband interference bandwidth interference search unit provides query feature information stored in the filter coefficient table, to give the corresponding filter coefficients, to the time domain digital notch filter unit configured coefficients.

[0036] 所述时域数字陷波滤波器单元203为一组或者多组级联的数字陷波滤波器(比如Notch滤波器等),其默认状态为Bypass状态(此状态本单元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)。 [0036] The time-domain digital notch filter 203 is a unit or more sets of cascaded digital notch filter (such as Notch filter or the like), which is the default state Bypass state (this state is present on the input unit baseband digital signal is not filtered, is directly output to the baseband demodulation process). 当时域数字陷波滤波器系数产生单元202送来的所需配置的系数后,首先将系数配置到相应的系数寄存器中,然后将Bypass状态变更为启动状态,此时滤波器开始对输入的基带信号进行滤波。 After the time-domain digital notch filter coefficient generation unit 202 in the desired configuration coefficients sent, to configure the first coefficient corresponding coefficient register, and then the Bypass status is changed to active state, then the filter starts with the input of the group signal is filtered. 如果窄带干扰搜索单元201检测到干扰信号特征改变后,时域数字陷波滤波器系数产生单元202会重新送一组新的滤波器系数给本单元,此时只需要更新本单元的系数寄存器就可以对新的干扰信号进行滤波。 If the narrow-band interference search unit 201 detects the interference signal feature change, the time domain digital notch filter coefficient generation unit 202 will re-send a new set of filter coefficients to the present unit time only needs to be updated on the coefficient registers means of the present may filter the new interference signals.

[0037] 下表1给出了时域数字陷波滤波器系数产生单元查表所需的滤波器系数表结构。 [0037] Table 1 shows the time-domain digital notch filter coefficient generation unit filter coefficient table look-up the desired configuration.

Figure CN102404271BD00071

[0038]表1 [0038] TABLE 1

[0039] 为了减小表中数据量两从而缩短查表时间,进行了如下处理:假设基带信号频谱带宽为B,将干扰带宽值选为频谱带宽的N等分,即干扰带宽可选择为B/N、2B/N、…、B。 [0039] In order to reduce the amount of data in the look-up table to shorten the time table two, were handled as follows: Suppose the baseband signal spectrum bandwidth is B, preferably interference bandwidth value N equal spectrum bandwidth, i.e. the bandwidth may be selected to interfere with 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)*BA2N)、…、-3*BA2N)、-1*BA2N)、 0、BA2N)、3*BA2N)、…、(2N-1)*BA2N);当干扰带宽选择为2B/N时,干扰频率可选择为-(N-1)*B/N,•..,-3*B/N、-l*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,干扰频率只能选择为0。 When the interference bandwidth is selected to B / N when the interference frequency is selected to be - (2N-1) * BA2N), ..., -3 * BA2N), - 1 * BA2N), 0, BA2N), 3 * BA2N), ... , (2N-1) * BA2N); when the interference bandwidth selection of 2B / N, the frequency may be selected to interfere with - (N-1) * B / N, • .., - 3 * B / N, -l * B / N, 0, B / N, 3 * B / N, ..., (N-1) * B / N; so, when the bandwidth is selected when the interference is B, the interference frequency is selected only 0. 查表先根据干扰带宽查询对于干扰带宽的子表,然后在所得到的子表中根据干扰频率查询最终所需配置的系数。 First look-up table for the sub-interference bandwidth, then a query based on the interference frequency coefficients according to the desired final configuration of the bandwidth of the interference in the sub-table queries obtained. 该系数表可以通过各种仿真软件针对上述所有带宽和干扰频率选择情况计算出每个对应的滤波器系数。 The coefficient table can be calculated by the filter coefficient corresponding to each of the various simulation software for all of the above cases the bandwidth and frequency selective interference.

[0040] 上述窄带干扰抑制装置可以集成到FPGA、ASICs、高性能DSP器件或者其他处理器中。 [0040] The narrow-band interference suppression apparatus may be integrated into the FPGA, ASICs, or other high-performance DSP processor devices.

[0041] 基于上述装置本发明还提供了一种窄带干扰抑制方法。 [0041] Based on the above-described apparatus of the present invention also provides a method for suppressing narrow-band interference. 图3给出了本发明所述方法的流程图。 Figure 3 shows a flow chart of the method of the invention.

[0042] 步骤301:从输入数字信号中采样N个数据点(N为2的幂次,可选择为512、1024 等)进行快速傅里叶变换,获取当前输入数字信号的频域信号。 [0042] Step 301: sampling an input digital signal from the N data points (N is a power of 2, 512, 1024, etc. to be selected) fast Fourier transform, obtaining the frequency domain signal current input digital signal.

[0043] 步骤302:对频域信号的模进行平滑滤波处理,然后根据设定的们限制值检测窄带干扰情况,大于门限值为存在窄带干扰,否则为不存在窄带干扰。 [0043] Step 302: frequency domain signal of the analog smoothing filter process, and then detecting narrowband interference limit value is set according to the case are greater than the threshold value for the presence of narrowband interference, or narrowband interference. 对于存在窄带干扰的情况,获取窄带干扰频率和干扰带宽,其方法为:由门限值与频谱信号交叉的两个点之间数据点的中间点获取干扰频率,由门限值与频谱信号交叉的两个点之间数据点个数获取干扰带宽。 For the presence of narrowband interference, narrowband interference obtain frequency and interference bandwidth which method: obtaining interference frequency data points from the intermediate point between two points crossing the threshold value and the spectrum of the signal by the signal crossing the threshold spectrum the number of data points between the two acquisition points interference bandwidth. 如有需求还可以将窄带干扰特性情况告知基站控制器。 If demand may also be narrow-band interference characteristics inform the base station controller.

[0044] 步骤303 :根据302的检测结果,判断是否存在窄带干扰。 [0044] Step 303: according to the detection result 302, it is determined whether there is a narrow-band interference. 如果存在则表明需要进行滤波处理,此时跳转到305 ;否则表示不需要进行滤波处理,直接跳转到304。 If present, indicates the need for filtering, then jumps to 305; otherwise indicates that no filtering process directly jumps to 304.

[0045] 步骤304 :当不存在干扰时,需要设置时域数字陷波滤波器模块为Bypass模式,使得输入到时域数字陷波滤波器单元的数字信号直接送至时域数字陷波滤波器单元的输出, 然后返回步骤301。 [0045] Step 304: When there is no interference, needs to set the time-domain digital notch filter module Bypass mode, so that the digital signal input to the digital notch filter unit domain directly to the time domain digital notch filter an output unit, and then returns to step 301.

[0046] 步骤305 :记录步骤302检测的窄带干扰频率和干扰带宽情况,用作下级单元查表用。 [0046] Step 305: the interference and narrowband interference frequency bandwidth detected recording step 302, the lower unit is used as a look-up table.

[0047] 步骤306 :根据305提供的窄带干扰频率和干扰带宽进行查表(该数据表由仿真软件生成,存储于存储器内,表格格式表1所示),先根据干扰带宽查询到相应的子表,然后在根据干扰频率查询该子表得到当前时域数字陷波滤波器所需的配置系数。 [0047] Step 306: The look-up table narrowband interference bandwidths and interference frequency 305 provides (for the Table is generated by simulation software, stored in memory, a table format shown in Table 1), corresponding to the first sub-query based on the interference bandwidth, table, and the sub-query based on the interference frequency table to obtain the current configuration of the desired time domain digital notch filter coefficient.

[0048] 步骤307 :配置时域数字陷波滤波器系数,并将该滤波器模式设置为工作模式。 [0048] Step 307: Configure a time domain digital notch filter coefficients, and sets the operation mode of the mode filter.

[0049] 以上所述的仅是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明创造构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。 [0049] The above-described embodiment is merely a preferred embodiment of the present invention, it should be noted that those of ordinary skill in the art, without departing from the concept of the present invention to create a premise, can make various changes and modifications, those fall within the protection scope of the present invention.

Claims (6)

  1. 1. 一种OFDM接收机的窄带干扰抑制装置,该装置位于OFDM接收链路上,介于中频处理模块和基带处理模块之间,其特征在于,它包括窄带干扰搜索单元、时域数字陷波滤波器系数产生单元和时域数字陷波滤波器单元; 所述窄带干扰搜索单元首先对输入的基带数字信号进行快速傅里叶变换处理,得到频域信号的模,然后对频域信号模进行平滑滤波处理,通过设定的门限值来确定当前信号中是否存在窄带干扰,如果存在窄带干扰则获取所需抑制的干扰频率和干扰带宽特征信息, 用于时域数字陷波滤波器产生单元,同时可上报检测结果给基站处理器; 所述时域数字陷波滤波器系数产生单元根据窄带干扰搜索单元提供的窄带干扰频率和干扰带宽特征信息查询存储中的滤波器系数表,得到相应的滤波器系数,送至时域数字陷波滤波器单元进行系数配置; 所述 An OFDM receiver narrowband interference suppression device, the device is located on the OFDM receiving link between the intermediate frequency processing module and a baseband processing module is interposed, characterized in that it comprises a narrowband interference search unit time domain digital notch filter coefficient generating unit and the time domain digital notch filter unit; the narrowband interference search unit firstly inputted baseband digital signal fast Fourier transform processing, frequency-domain signal obtained mold, the mold is then performed on the frequency domain signal smoothing process, by setting the threshold value to determine whether the presence of narrowband interference in the current signal, if narrowband interference is present and interference to obtain the required frequency bandwidth of the interference suppression characteristic information, for time domain digital notch filter generating unit , while the base station reports the detection result to the processor; the time-domain digital notch filter coefficients to produce narrowband interference filter coefficient table and the interference frequency bandwidth characteristics to provide information query storage unit according to narrowband interference search unit, to give the corresponding filter coefficients, time domain to the digital notch filter unit configured coefficients; the 域数字陷波滤波器单元为一组或者多组级联的Notch滤波器,其默认状态为Bypass状态,此状态本时域数字陷波滤波器单元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;当时域数字陷波滤波器系数产生单元送来的所需配置的系数后,首先将系数配置到相应的系数寄存器中,然后将Bypass状态变更为启动状态,此时时域数字陷波滤波器单元开始对输入的基带信号进行滤波;如果窄带干扰搜索单元检测到干扰信号特征改变后,时域数字陷波滤波器系数产生单元会重新送一组新的滤波器系数给时域数字陷波滤波器单元,此时只需要更新时域数字陷波滤波器单元的系数寄存器就可以对新的干扰信号进行滤波; 基带信号频谱带宽为B,将干扰带宽值选为频谱带宽的N等分,即干扰带宽可选择为B/N、2B/N、…、B;当干扰带宽选择为B/N时,干扰频率可选择 Domain digital notch filter as a unit or more sets of cascaded Notch filter, which is Bypass default state, the present state of this time domain digital notch filter unit is inputted baseband digital signal not filtered output directly to the baseband demodulation processing; the desired configuration of the coefficient unit was fed domain coefficient generation digital notch filter, first coefficient corresponding to the configuration of the coefficient register, and then the Bypass status is changed to active state, then time domain digital notch filter means starts the input baseband signal filtering; if narrowband interference means interfering signal is detected the search feature change, the time domain digital notch filter coefficient generating unit will re-send a new set of filter coefficients to the time domain digital notch filter unit needs to be updated only when this time-domain digital notch filter coefficient register unit may filter the new interference signal; a baseband signal spectrum bandwidth is B, preferably interference spectrum bandwidth bandwidth value N aliquot, i.e., the bandwidth may be selected to interfere with B / N, 2B / N, ..., B; interference when the bandwidth is selected to B / N, the interference frequency selectable 为-(2N-1)*BA2N)、…、-3*B/ (2N)、-1*BA2N)、0、BA2N)、3*BA2N)、…、(2N-1)*BA2N);当干扰带宽选择为2B/N时,干扰频率可选择为-(N-1)*B/N,...,-3*B/N、-l*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,干扰频率只能选择为0 ;先根据干扰带宽查询对于干扰带宽的子表,然后在所得到的子表中根据干扰频率查询最终所需配置的系数;该系数表可以通过各种仿真软件针对上述所有带宽和干扰频率选择情况计算出每个对应的滤波器系数。 Is - (2N-1) * BA2N), ..., -3 * B / (2N), - 1 * BA2N), 0, BA2N), 3 * BA2N), ..., (2N-1) * BA2N); if when the interference bandwidth selection of 2B / N, the frequency may be selected to interfere with - (N-1) * B / N, ..., - 3 * B / N, -l * B / N, 0, B / N, 3 * B / N, ..., (N-1) * B / N; so, when the interference bandwidth is selected as B, the interference frequency is selected to be 0 only; the first sub-table queries based on the interference bandwidth is the bandwidth for the interference, and in the sub-table query coefficients obtained final desired configuration based on the interference frequency; can calculate the coefficient table corresponding to each filter coefficient by various simulation software for all of the above cases the bandwidth and frequency selective interference.
  2. 2. -种权利要求1所述的OFDM接收机的窄带干扰抑制装置的窄带干扰抑制方法,其特征在于,它包括如下步骤: (1) 、获取输入基带信号频谱:对输入的基带信号进行快速傅里叶变换,获取输入基带信号频谱; (2) 、确定窄带干扰特征:对获取的输入基带信号频谱的模进行平滑滤波处理后,与设定的门限值比较,判断输出信号是否存在窄带干扰,并获取其干扰频率和干扰带宽; (3) 、确定滤波器系数:根据窄带干扰的干扰频率和干扰带宽,通过查表选择相匹配的滤波器系数; (4) 、配置滤波器:将所获得的滤波器系数配置到时域数字陷波滤波器单元中。 2 - narrowband interference according to a kind of the OFDM receiver as claimed in claim narrowband interference suppression method for suppressing means, characterized in that it comprises the following steps: (1) obtain a baseband input signal spectrum: baseband signal performs fast Fourier transformation, acquired input baseband signal spectrum; (2), wherein narrow-band interference is determined: after an input analog baseband signal spectrum acquired smoothing filter process, with the set threshold value, and determines whether the output signal the presence of narrowband interference, and acquires interference bandwidths and interference frequency thereof; (3), determining filter coefficients: the interference frequency bandwidth of the interference and narrowband interference filter coefficient look-up table by selecting matched; (4), configurable filter: the the obtained filter coefficients configured to time domain digital notch filter unit.
  3. 3. 根据权利要求2所述的OFDM接收机的窄带干扰抑制方法,其特征在于,在所述步骤(2)中,窄带干扰判断方法包括:对频域信号的模进行平滑滤波处理,然后根据设定的们限制值检测窄带干扰情况,大于门限值为存在窄带干扰,否则为不存在干扰。 3. The method of suppressing narrow-band interference in an OFDM receiver according to claim 2, wherein, in the step (2), the narrow-band interference determination method comprising: analog frequency domain signal smoothing filter process, and then in accordance with It sets limits to detect narrowband interference cases, greater than the threshold for the presence of narrowband interference, otherwise there is no interference.
  4. 4. 根据权利要求2所述的OFDM接收机的窄带干扰抑制方法,其特征在于,在所述步骤(2)中,窄带干扰特征获取方法包括:在存在干扰的情况下,获取窄带干扰频率和干扰带宽; 由门限值与频谱信号交叉的两个点之间数据点的中间点获取干扰频率,由门限值与频谱信号交叉的两个点之间数据点个数获取干扰带宽。 4. The method of suppressing narrow-band interference in an OFDM receiver according to claim 2, wherein, in the step (2), characterized in narrowband interference acquiring method comprising: in the presence of interference, narrowband interference frequency and acquires the bandwidth of the interference; intermediate point between the two data points by the points crossing the threshold value of the frequency spectrum of the interference signal acquisition, the number of data points acquired interference bandwidth between two points crossing the threshold of a signal spectrum.
  5. 5. 根据权利要求2所述的OFDM接收机的窄带干扰抑制方法,其特征在于,在所述步骤(3) 中,所述确定滤波器系数包括:提供的窄带干扰频率和干扰带宽进行查表,先根据干扰带宽查询到相应的子表,然后在根据干扰频率查询该子表得到当前时域数字陷波滤波器单元所需的配置系数。 The narrowband interference in an OFDM receiver according to claim 2 suppression method, wherein, in the step (3), the filter coefficient determining comprising: a narrow-band interference and interference frequency bandwidth provided look-up table , to query the bandwidth of the interference to the corresponding sub-table, then queries the interference frequency of the sub-table arranged to give the desired coefficient of the current time domain digital notch filter unit.
  6. 6. 根据权利要求2所述的OFDM接收机的窄带干扰抑制方法,其特征在于,在所述步骤(4) 中,所述时域数字陷波滤波器配置包括: 当不存在干扰时,需要设置时域数字陷波滤波器单元为Bypass模式,使得输入到时域数字陷波滤波器单元的数字信号直接送至时域数字陷波滤波器单元的输出; 当存在干扰时,更新时域数字陷波滤波器系数,并将该滤波器模式设置为工作模式,此时输出的信号为滤波后信号。 6. The narrowband interference suppression OFDM receiver according to claim 2, characterized in that, in said step (4), said time domain digital notch filter arrangement comprising: when there is no interference, need time-domain digital notch filter setting unit Bypass mode, so that the input to the time domain digital notch filter unit is a digital signal directly to the time domain digital output of notch filter unit; when there is interference, update the digital domain notch filter coefficient, and sets the filter mode to the active mode, when the output signal is a filtered signal.
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