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

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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

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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

CLC Number: 

  • TN919.3
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