吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (2): 497-501.doi: 10.13229/j.cnki.jdxbgxb201402035

• 论文 • 上一篇    下一篇

基于期望最大化算法的联合符号检测和相位估计算法

王戈1,2, 沈智翔1, 于宏毅1   

  1. 1. 中国人民解放军信息工程大学 信息工程学院, 郑州 450002;
    2. 中国西安卫星测控中心, 西安 710043
  • 收稿日期:2012-10-17 出版日期:2014-02-01 发布日期:2014-02-01
  • 作者简介:王戈(1982- ),男,博士研究生.研究方向:通信信号处理,信号解调算法.E-mail:superwangge@sohu.com
  • 基金资助:

    国家重大科技专项项目(2008ZX03006);"863"国家高技术研究发展计划项目(2012AA121606).

Joint symbol detection and phase estimation algorithm based on expectation-maximum

WANG Ge1,2, SHEN Zhi-xiang1, YU Hong-yi1   

  1. 1. Institute Information Engineering, The PLA Information Engineering University, Zhengzhou 450002, China;
    2. China Xi'an Satellite Control Center, Xi'an 710043, China
  • Received:2012-10-17 Online:2014-02-01 Published:2014-02-01

摘要:

针对带有未知载波相位的符号检测问题,提出了一种基于期望最大化(EM)算法的联合符号检测与相位估计算法,该算法改变了传统最佳接收算法中先估计载波相位再进行符号检测的分级处理方式,直接通过EM算法进行符号检测。在算法收敛之后,判决获得符号信息的同时,可得到未知载波相位的最大似然(ML)估计,从而实现了符号信息与载波相位的联合估计与检测。由于该算法不需要进行同步参数估计,因此可以大大降低传统最佳接收方法分级处理方式所带来的性能损失。仿真实验表明,该算法与传统最佳接收算法中先通过非数据辅助(NDA)方法估计载波相位再进行符号检测相比,性能有明显提升,可以达到导频辅助下的符号检测性能,由于不需要估计载波相位,因此处理复杂度大大降低。

关键词: 通信技术, 期望最大化算法, 符号检测, 相位估计, 误符号率

Abstract:

In this paper, the problem of symbol detection in the presence of unknown carrier phase is studied. A joint symbol detection and phase estimation algorithm based on the Expectation-Maximum (EM) algorithm is developed, which is different from the traditional optimum receive algorithm. The algorithm does not need to estimate the carrier phase and obtain symbol information directly. After the algorithm convergence, it obtains signal information, at the same time estimates the maximum-likelihood (ML) of unknown carrier phase, and consequently realizes the joint symbol detection and phase estimation. Because the algorithm does not require synchronization parameters estimation, it can reduce the loss of performance, which is brought by the hierarchical processing of the traditional method. Simulation results show that, in comparison with the traditional optimum receive algorithm, which has to estimate the phase by non-data-aided first, then detect symbol information, the performance of the proposed algorithm is improved significantly.

Key words: communication, expectation-maximization algorithm, symbol detection, phase estimation, symbol error rate(SER)

中图分类号: 

  • TN911.23

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