计算机工程 ›› 2012, Vol. 38 ›› Issue (21): 103-106.doi: 10.3969/j.issn.1000-3428.2012.21.028

• 网络与通信 • 上一篇    下一篇

CPM信号的定时-相位联合估计算法

刘晓明,廖 聪,汪梦柔   

  1. (重庆大学通信工程学院,重庆 400030)
  • 收稿日期:2011-12-26 出版日期:2012-11-05 发布日期:2012-11-02
  • 作者简介:刘晓明(1963-),男,教授,主研方向:扩频通信,宽带无线通信;廖 聪、汪梦柔,硕士研究生
  • 基金项目:
    国家自然科学基金资助项目(51035008)

Joint Timing and Phase Estimation Algorithm for CPM Signals

LIU Xiao-ming, LIAO Cong, WANG Meng-rou   

  1. (College of Communication Engineering, Chongqing University, Chongqing 400030, China)
  • Received:2011-12-26 Online:2012-11-05 Published:2012-11-02

摘要: 针对CPM信号同步问题,在判决数据辅助的基础上提出一种联合定时-相位估计算法。该算法用Laurent分解表示CPM信号,由定时-相位联合似然函数得到定时误差检测器和相位误差检测器,找出瞬时梯度,迭代求解恢复出定时和相位信息。通过分析二进制部分响应CPM中的常见形式PCM/FM信号,提出一种联合定时-相位估计的实现方案。在加性高斯白噪声信道上的仿真结果表明,该算法适用于二进制部分响应CPM信号,定时和相位估计性能都逼近理想曲线。

关键词: 连续相位调制, 定时误差检测器, 相位误差检测器, 定时恢复, 载波相位估计

Abstract: A joint timing and carrier phase estimation algorithm is proposed for the synchronization problem of Continuous Phase Modulation (CPM) based on decision data. After using Laurent representation to express CPM signals, Timing Error Detector(TED) and Phase Error Detector (PED) are got from the joint likelihood function of timing and carrier phase. After finding the instant gradient, the estimated timing and phase value is recovered by iteration computation. After analyzing the common binary partial response CPM signals such as PCM/FM, the implementation scheme of joint timing and carrier phase estimation algorithm is designed. Simulation result shows that the proposed algorithm is suited for binary partial response CPM signals. The timing and carrier phase error variance curve is close to the theoretical limit.

Key words: Continuous Phase Modulation(CPM), Timing Error Detector(TED), Phase Error Detector(PED), timing recovery, carrier phase estimation

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