J4 ›› 2011, Vol. 38 ›› Issue (5): 90-94.doi: 10.3969/j.issn.1001-2400.2011.05.015

• Original Articles • Previous Articles     Next Articles

Novel frequency estimation of MPSK signals in low SNR environment

CUI Yanpeng;HU Jianwei;YANG Shaoquan;WANG Wei   

  1. (Research Inst. of Electronic Countermeasures, Xidian Univ., Xi'an  710071, China)
  • Received:2010-12-07 Online:2011-10-20 Published:2012-01-14
  • Contact: CUI Yanpeng E-mail:ypcui@mail.xidian.edu.cn


A novel frequency estimation method of MPSK signals in the low SNR condition is proposed, which solves the problem of requiring a high signal-to-noise ratio. First, the AR models are created by using the modern spectrum estimation method, and the small residual frequency offset signal is obtained through rough carrier frequency estimation values of the MPSK signal. Then after the M-th nonlinear transformation, the higher accuracy of the residual frequency offset value is estimated based on the maximum likelihood criterion. Simulation results show that the algorithm can lead to a higher accuracy under the low-SNR condition and that it is stable and reliable.

Key words: MPSK signals, frequency estimation, low signal to noise ratio, M-th nonlinear transformation, maximum-likelihood criterion

CLC Number: 

  • TN911