部分频带干扰下的OFDM系统干扰检测与分集抑制算法  

Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming

作　　者：李果 文妮 宫丰奎[1] 张剑[2] 张思瀚 LI Guo;WEN Ni;GONG Fengkui;ZHANG Jian;ZHANG Sihan(State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an 710071,China;Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071 [2]中国西南电子技术研究所,四川成都610036

出　　处：《通信学报》2021年第9期194-204,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61901325,No.62001354);国家重点研发计划基金资助项目(No.2018YFE0100500);中国博士后基金资助项目(No.2018M640958);陕西省技术创新引导专项基金资助项目(No.2020CGXNG-036)。

摘　　要：面向目前应用广泛的正交频分复用(OFDM)系统,提出了一种基于前向连续方差去除(FCVE)的干扰检测算法和基于频率分集的干扰抑制算法,通过该组合策略大幅提高了部分频带干扰条件下的通信性能。理论推导了FCVE算法的门限因子,并利用设定的门限因子和接收信号方差计算得到干扰检测门限值,进而实现高准确度的干扰检测。仿真结果表明,所提FCVE算法在高信干比(SIR)条件下显著提高了经典的前向连续均值去除(FCME)算法的干扰检测概率。进一步地,利用干扰检测结果,基于频率分集思想进行干扰抑制,仿真结果表明,在相同信干比条件下,系统误比特率(BER)可降低2个量级。For the currently widely-used OFDM system,which greatly improved the communication performance under the condition of partial-band jamming,an interference detection algorithm based on FCVE and an interference suppression algorithm based on frequency diversity were proposed.The threshold factor formula of FCVE algorithm was derived theoretically,and the interference detection threshold was calculated by using the threshold factor and the variance of the received signal,so as to achieve the interference detection with high accuracy.The simulation results show that the proposed FCVE algorithm significantly improves the interference detection probability of the classical FCME algorithm under the condition of high signal to interference ratio(SIR).Further,the interference can be greatly suppressed based on the idea of frequency diversity with the result of interference detection.The simulation results show that the bit error rate of the system can be reduced by two orders of magnitude under the same SIR.

关 键 词：正交频分复用 部分频带干扰 干扰检测 干扰抑制 

分 类 号：TN929.5[电子电信—通信与信息系统]