卫星成对载波多址信号的一种联合分离解调算法  

Joint separation and demodulation algorithm for paired carrier multiple access signals

作　　者：廖灿辉[1,2] 黄渊凌[2] 周世东[1] 

机构地区：[1]清华大学微波与数字通信国家重点实验室,北京100084 [2]西南电子电信技术研究所,四川成都610041

出　　处：《通信学报》2010年第6期99-105,共7页Journal on Communications

摘　　要：针对现有PCMA处理算法需要先分离后解调,且解调性能受分离误差影响的缺点,提出了一种基于TD-MLSE和PSP-MLSE思想的联合分离解调算法。该算法不需要进行混合信号分离,而是直接从接收信号中估计对方发送的信息序列。仿真表明,该算法在估计符号序列的同时具有良好的信道捕获与跟踪能力,并在2倍过采样下能得到较低的误码性能。小频偏下可选择复杂度小的TD-MLSE算法,而大频偏下选择PSP-MLSE算法跟踪性更好。The existing processing algorithms for paired carrier multiple access（PCMA） signals need to separate the mixed signals before demodulation whose performance is degraded dramatically by the separation error.To overcome this problem,a new algorithm based on tentative decision maximum likelihood sequence estimation（TD-MLSE） and per-survivor processing maximum likelihood sequence estimation（PSP-MLSE） was proposed.The proposed algorithm,which executes separation and demodulation together,estimates the transmitted sequence of the other side from the mixed signals directly.Numeric results show that the algorithm exhibits good acquisition and tracking capacities for unknown time-varying channel and has excellent symbol error rate performance when 2-oversampling is adopted.In small frequency offset situation TD-MLSE is a better choice for its low complexity while in large frequency offset situation PSP-MLSE is more appropriate for its good tracking property.

关 键 词：联合分离解调 成对载波多址 TD-MLSE PSP-MLSE 

分 类 号：TN911.7[电子电信—通信与信息系统]