基于COFDM系统的窄带干扰抑制方法研究  

Research on narrow-band interference suppression method based on COFDM system

作　　者：刘伟伟[1] 刘春艳[1] 高芳芳[1] LIU Wei-wei;LIU Chun-yan;GAO Fang-fang

机构地区：[1]山东协和学院机电工程学院,山东济南250000

出　　处：《信息技术与信息化》2017年第4期140-143,共4页Information Technology and Informatization

基　　金：山东协和学院校级科研计划项目"COFDM系统抗频率选择性衰落和窄带干扰的研究";项目编号:XHXY201507

摘　　要：无线通信环境日趋复杂,作为4G关键技术的宽带OFDM信号可能受到部分频带上的窄带干扰影响,从而造成调制到相应子载波上的数据位出现差错。为对抗窄带干扰的影响,提出一种基于COFDM系统的窄带干扰抑制方法,通过在发送端对受干扰子载波预处理和映射,保证LDPC编码码长与OFDM帧长相等;在接收端,结合发送端对受干扰子载波的预处理和映射,对受干扰子载波进行逆映射,保证受干扰子载波上信息传输的准确性。仿真结果表明,本文所提出的方法确能有效对抗窄带干扰。Owing to more and more complex wireless communication environment,some sub-carriers of wide-band OFDM signalwhich is key technology of4G may be affected by narrow-band interference which leads to the bits error.To reject narrow-band interference,a scheme of COFDM to reject the narrow-band interference is proposed.At the transmmiter,combine interfered sub-carriers pre-processingand mapping to ensure the equality of LDPC code length and OFDM frame length.At the receiver,inverse mapping combining the preprocessingand mapping at the transmmiter is performed.The interfered sub-carriers information can be acquired precisely.Simulation resultsshow that the proposed scheme can reject narrow-band interference effectively.

关 键 词：LDPC码 OFDM 受干扰子载波检测 窄带干扰 

分 类 号：TN929.53[电子电信—通信与信息系统]