未知相位信道下Turbo码编码DPSK信号的联合迭代解调解码  

Iterative Joint Demodulation and Decoding of Turbo Coded DPSK Signals over Unknown Phase Channels

作　　者：吴晓富[1] 凌聪[1] 吕晶[1] 

机构地区：[1]南京通信工程学院卫星通信重点实验室

出　　处：《电子学报》2002年第1期97-101,共5页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .60 0 0 2 0 1 0 )

摘　　要：本文提出了未知相位信道下Turbo码编码DPSK信号的联合迭代解调解码算法 .推导了未知相位信道的最大后验概率 (MAP)算法 ,推导表明该MAP算法同样可用前向、后向递推方程来有效实现 .其次 ,采用等效信道的方法将未知相位信道的Turbo码解码问题化为AWGN信道下Turbo码的解码问题 .最后 ,引进了联合迭代解调解码算法 ,可用于Turbo码的解调解码 .In this paper,iterative joint demodulation and decoding of coded DPSK(differental phase shift keying)signals over an AWGN channel with unknown phase is presented.Firstly,the symbol by symbol maximum a posteriori probability (MAP) algorithm for an unknown phase channel is derived and it is shown that the MAP algorithm can be implemented efficiently using forward and backward recursions through the trellis.Secondly,the equivalent channel model approach is adopted and highlighted for subsequent systems to further process the channel MAP's output.Finally,the principle of iterative joint demodulation and decoding is introduced.The efficiency of the proposed algorithm is approved by many simulations.

关 键 词：TURBO码 最大后验概率算法 信道编码 DPSK信号 联合迭代解调解码 

分 类 号：TN911.22[电子电信—通信与信息系统]