MDPSK判决反馈差分检测联合检测后最大比分集接收  

Decision Feedback Differential Detection with Postdetection Maximal Ratio Diversity Reception for MDPSK

作　　者：张钦[1] 吴嗣亮[1] 李海[1] 

机构地区：[1]北京理工大学信息科学技术学院,北京100081

出　　处：《系统仿真学报》2009年第3期772-775,共4页Journal of System Simulation

摘　　要：针对MDPSK调制系统提出了采用判决反馈差分检测和检测后最大比合并的联合接收方法。设计了一种结构简单且可实现无限长判决反馈的差分检测器,在慢衰落多径信道中能够得到近似多符号最优检测器的检测性能,相比多符号检测计算量显著降低。分集接收可以有效的对抗多径衰落,采用检测后分集合并方法避免了检测前分集合并所需的同相化函数等复杂计算。仿真结果给出了联合接收方法的良好效果,复杂度分析表明了其易于工程实现。因此,所提算法是一种在慢衰落多径信道中具有低复杂度高性能的联合接收方法。A scheme of decision feedback different＆l detection with postdetection maximal ratio diversity reception for MDPSK was proposed. A differential detector with simple structure was designed. It can implement infinite step decision feedback. The proposed differential detector can achieve the best performance as multi-symbol differential detector in slow fading channel, while the quantity of computation is sharply reduced. Diversity reception is an effective method to improve performance in multipath fading channel. Postdetection diversity combination avoids computation of cophasing function which is required by predetection diversity combination. Simulation result exhibits the perfect performance of the proposed joint scheme, and complexity analysis shows its facility in realization. Consequently, the proposed joint scheme is in character of low complexity and good performance in slow fading channel.

关 键 词：判决反馈差分检测 检测后分集接收 最大比合并 MDPSK 

分 类 号：TN913[电子电信—通信与信息系统]