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

WU Xiao-fu; LING Cong; LU Jin

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

更新时间：2025-07-16

- Iterative Joint Demodulation and Decoding of Turbo Coded DPSK Signals over Unknown Phase Channels
- Acta Electronica Sinica Vol. 30, Issue 1, Pages: 97-101(2002)
- 作者机构：
  
  1. 南京通信工程学院卫星通信重点实验室,江苏,南京,210016
  2. 北京大学电子学系,北京,100871
  3. 南京通信工程学院卫星通信重点实验室江苏南京,210016
  4. 北京大学电子学系北京,100871
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919
- Published：2002
- 稿件说明：
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WU Xiao-fu, LING Cong, LU Jin. Iterative Joint Demodulation and Decoding of Turbo Coded DPSK Signals over Unknown Phase Channels[J]. Acta Electronica Sinica, 2002, 30(1): 97-101.
DOI：

WU Xiao-fu, LING Cong, LU Jin. Iterative Joint Demodulation and Decoding of Turbo Coded DPSK Signals over Unknown Phase Channels[J]. Acta Electronica Sinica, 2002, 30(1): 97-101. DOI：

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.模拟表明本文算法可有效用于未知相位信道Turbo码的解码.

Abstract

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.

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