吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (1): 291-296.doi: 10.13229/j.cnki.jdxbgxb201501042

• 论文 • 上一篇    下一篇

连续相位调制信号的载波相位软同步算法

周相超,薛睿,赵旦峰,付芳   

  1. 哈尔滨工程大学 信息与通信工程学院,哈尔滨 150001
  • 收稿日期:2013-05-08 出版日期:2015-02-01 发布日期:2015-02-01
  • 通讯作者: 赵旦峰(1961),男,讲师,博士.研究方向:卫星通信与卫星导航.E-mail:xuerui@hrbeu.edu.cn
  • 作者简介:周相超(1987),男,博士研究生.研究方向:同步算法,信道编码与调制.E-mail:zhouxiangchao@hrbeu.edu.cn
  • 基金资助:
    国家自然科学基金项目(61403093);中央高校基本科研业务费专项项目(HEUCF130802);黑龙江省留学归国人员科学基金(LC2013C22);黑龙江省博士后科研启动金项目(LBH-Q14048).

Soft carrier phase synchronization algorithm for continuous phase modulations signals

ZHOU Xiang-chao,XUE Rui,ZHAO Dan-feng,FU Fang   

  1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001,China
  • Received:2013-05-08 Online:2015-02-01 Published:2015-02-01

摘要: 针对连续相位调制(CPM)信号载波相位同步困难的问题,提出一种通用的CPM信号的载波相位软同步算法。在CPM调制信号的Rimoldi分解的基础上,基于最大似然准则和EM算法推导了载波相位的软同步算法,该算法将解调器与同步器联合,利用CPM软解调器输出的软信息进行载波相位估计。仿真结果表明,该算法能够得到接近修正克拉美罗限的载波相位估计,并获得近似理想的误码率性能。

关键词: 通信技术, 载波相位同步, 连续相位调制, EM算法, 软解调

Abstract: Considering the difficulty of phase synchronization for Continuous Phase Modulated (CPM) signals, a general Soft Carrier Phase Synchronization (SCPS) algorithm for different signals is proposed. Using Rimoldi decomposition of CPM signals, the SCPS algorithm is derived based on maximum likelihood criterion and the Expectation-Maximization (EM) algorithm. The synchronizer and demodulator are iterated jointly. The soft demodulation information provided by CPM soft demodulator is used to aid the carrier phase estimation. Simulation results indicate that the Root Mean Square Estimation Error (RMSEE) of the SCPS algorithm is very close to that of the Modified Cramer-Rao Bound (MCRB) for general CPM signals, and the bit error rate could achieve approximate ideal performance.

Key words: communication, carrier phase synchronization, continuous phase modulations(CPM), EM algorithm, soft demodulation

中图分类号: 

  • TN919.3
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