基于编码辅助和过采样的成对载波多址信号盲分离算法  

Blind Paired Carrier Multiple Access Signal Separation Using Channel Coding and Oversampling

作　　者：丁良辉[1] 李天赐[1] 杨峰[2] 钱良[2] 支琤[1] 

机构地区：[1]上海交通大学图像通信与网络工程研究所,上海200240 [2]上海交通大学无线通信技术研究所,上海200240

出　　处：《上海交通大学学报》2015年第10期1527-1533,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(61221001;61301117;61420106008);上海市重点实验室项目(12DZ2272600)资助

摘　　要：针对对称通信模式下成对载波多址(PCMA)信号的非协作盲分离和解调问题,提出了一种基于编码辅助与过采样相结合的信号盲分离算法.针对两路正交相移键控(QPSK)信号叠加的情况,推导了过采样条件下的信道参数估计表达式,利用加权递归最小二乘法提高信道参数估计的收敛速度,利用编码辅助降低计算复杂度和误码率,以改进已有的逐幸存路径(PSP)算法,并提高低信噪比条件下的信号分离性能.仿真结果表明,与无编码辅助和过采样的信号盲分离算法相比,所提出的基于编码辅助和过采样的算法可使误码率降至20dB.Aimed at blind separation and demodulation of the paired carrier multiple access（PCMA）signal in non-symmetrical communication mode,a novel seperation algorithm was proposed based on channel coding and oversampling.Considering the mixture of two QPSK signals in a single channel,the estimated parameters under oversampling was estimated,channel coding was used to decrease the time cost and bit error ratio（BER）,and weighted recursive least squares（RLS）was used to speed up the channel parameter estimation.These techniqes significantly improved the BER performance of per-survivor processing（PSP）in lower SNR.Simulation results show that the proposed blind signal seperation algorithm using channel coding and oversamping can greatly improve the BER performance by up to 20 dB compared to existing algorithms.

关 键 词：成对载波多址 逐幸存路径 编码辅助 过采样 

分 类 号：TN911.7[电子电信—通信与信息系统]