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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 .模拟表明本文算法可有效用于未知相位信道Turbo码的解码
In this paper, a joint iterative demodulation and decoding algorithm for Turbo coded DPSK signals is proposed for unknown phase channels.The maximum a posteriori (MAP) algorithm of unknown phase channel is deduced, and the derivation shows that the MAP algorithm can also be applied to forward and backward recurrence equations To realize effectively.Secondly, the equivalent channel method is used to transform the unknown phase channel Turbo decoding problem into the Turbo decoding problem under the AWGN channel.Finally, the joint iterative demodulation and decoding algorithm is introduced to demodulate the Turbo codes Decoding.The simulation shows that the proposed algorithm can be effectively used for the decoding of unknown phase channel Turbo codes