Computer Science ›› 2019, Vol. 46 ›› Issue (10): 97-102.doi: 10.11896/jsjkx.180901777

Special Issue: Network and communication

• Network & Communication • Previous Articles     Next Articles

M-APSK Signal Modulation and Demodulation Method Approaching Gaussian Channel Capacity

JIANG Xuan-you, WEI Yi-min, WANG Lei, LIU Ling-jun, PENG Lei   

  1. (College of Communications Engineering,Army Engineering University,Nanjing 210007,China)
  • Received:2018-09-20 Revised:2018-12-02 Online:2019-10-15 Published:2019-10-21

Abstract: In the digital communication system,when a discrete signal uniformly distributed on the constellation is transmitted through the AWGN channel with limited power and noise power spectral density,the maximum information rate can’t reach the Gaussian channel capacity.Aiming for improving transmission rate to approach the channel capacity,a non-uniform distribution design of signal constellation is quite necessary.Therefore,Box-Muller transform is used to construct the M-APSK signal constellation obeying the Gaussian distribution when the constellation points approach infinity .Simulation results show that the maximum information rate is equal to the Gaussian channel capacity.Compared with rectangular M-QAM signal,the performance improves considerably when the modulation order is sufficiently high.On this basis,according to the distribution characteristics of the constellation,this paper designed a modulation and demodulation scheme based on Gray coding and simplified Max-Log LLR algorithm which reduces system complexity significantly.At last,the system complexity and bit error rate performance of the proposed scheme were verified through Matlab simulation.

Key words: Box-Muller transform, Constellation design, M-APSK modulation, Max-Log LLR algorithm

CLC Number: 

  • TN911.7
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