改进的CMFB多载波通信系统脉冲干扰抑制方法  

Modified pulse-interference cancellation method for CMFB based multi-carrier communication system

作　　者：杨静[1] 余梦佳[2] 李健波 

机构地区：[1]重庆邮电大学科学技术处,重庆400065 [2]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065 [3]重庆市教育考试院信息处,重庆401147

出　　处：《重庆邮电大学学报（自然科学版）》2015年第5期583-588,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家重大科技专项(2013ZX03001004-003);国家重大科学仪器设备开发专项(2012YQ20022404)~~

摘　　要：利用压缩感知和预留子载波技术,提出一种改进的余弦调制滤波器组多载波通信系统的时域脉冲干扰抑制方法。不同于传统采用滤波器组多载波(filter bank multi-carrier,FBMC)脉冲干扰抑制方法:该方案可以在已知时域脉冲干扰数目的情况下,对其位置与大小精确估计。接收端首先通过预留子载波上的信息进行脉冲干扰的预判,然后利用压缩感知贪婪基追踪算法估计出其他载波上的混合干扰,最后结合预判信息,在混合干扰中提取出纯净的脉冲干扰并予以消除。仿真实验对上述方法与传统干扰抑制方法进行了可靠性比较,在信噪比达到15 d B时,随着信噪比的提高,提出的干扰抑制方法能够更加有效地抑制时域脉冲干扰,极大地降低了系统的误符号率。By using compressive-sensing and subcarriers-reserved technologies,this paper presents a modified pulse-interference cancellation method for cosine modulation filter banks based multi-carrier communication system. Different from conventional pulse-interference suppression method for FBMC system,the proposed method is able to estimate the locations and strength of the pulse-interference with known numbers of time-domain pulses. Firstly,the receiver makes pre-detection for pulse-interference with the reserved subcarriers,and then the detected information is processed by greedy basis pursuit（ GBP） algorithms to predict the mixed interference on whole carriers. Finally,the locations and strength of the pulse-interference can be found by simply comparing the previous two results. We use simulations to verify the effectiveness of the proposed method. Compared with traditional pulse-interference cancellation method in terms of the reliability,when SNR achieves 15 d B,the proposed method can suppress the pulse-interference in time-domain more effectively with the improvement of SNR,which greatly reduces the system symbol error rate.

关 键 词：压缩感知 余弦调制滤波器组(CMFB) 干扰抑制 误符号率(SER) 

分 类 号：TN911.4[电子电信—通信与信息系统]