Journal of Guangxi Normal University(Natural Science Edition) ›› 2016, Vol. 34 ›› Issue (2): 35-45.doi: 10.16088/j.issn.1001-6600.2016.02.006

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A Novel QPSK Signal Demodulation Method Based on Wavelet Transform

CHEN Jin, LUO Xiaoshu   

  1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004,China
  • Received:2015-12-10 Online:2016-06-25 Published:2018-09-14

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Abstract: According to the characteristics of the time-frequency analysis of the wavelet transform, a novel QPSK(quadrature phase shift keying) signal demodulation method in the communication system is proposed. The novel demodulation method for QPSK signal is different from the traditional demodulation method. First of all, it can directly extract and decide the frequency and phase (equivalent to the instantaneous value) of the received QPSK signal and it is a time-frequency detection method which has the multi-resolution properties; second, it is a "blind detection" method without strict synchronization between the transmitter signal and receiver signal. The computer simulation results show that the novel signal demodulation method has better performance than the traditional one in anti-noise property and robustness of anti complex channel.

Key words: wavelet transform, time-frequency analysis, QPSK, blind detection, robustness

CLC Number: 

  • TN911
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