Journal of Applied Sciences ›› 2017, Vol. 35 ›› Issue (3): 309-316.doi: 10.3969/j.issn.0255-8297.2017.03.004

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Modulation Recognition of Double Satellite Signals in Alpha-Stable Distribution Noise

YANG Wei-chao, YANG Xin-quan   

  1. China Academy of Space Technology (Xi'an), Xi'an 710100, China
  • Received:2016-09-28 Revised:2016-12-11 Online:2017-05-30 Published:2017-05-30

Abstract:

Modulation recognition algorithms of single signal based on second-order cyclic spectrum does not work in an Alpha-stable distribution noise environment. To deal with the problem, a recognition algorithm based on general second-order cyclic spectrum for double signals is proposed. Insensitivity of general second-order cyclic spectrum to Alphastable distribution noise is analyzed, and spectral properties of the double signals are then studied. Pulse spectral lines in the cyclic frequency domain of spectrum are extracted to be used as characteristic parameters for recognition. Modulation recognition of the double satellite signals is achieved by detecting the number of pulse lines. Simulation results show that the proposed algorithm has good performance in the two kinds of noise.

Key words: modulation recognition, general second-order cyclic spectrum, Alpha-stable distribution noise, double signals

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