Performance Analysis of Mobile Wireless Sensor Network System Under n-Rayleigh Fading Channels
Lingwei Xu · Chuangan jishu xuebao · 2015
The average symbol error probability( ASEP) and channel capacity of the mobile wireless sensor network system employing selection combining( SC) receiving under n-Rayleigh fading channels is investigated in this paper.Based on the moment generating function( MGF) approach,the exact ASEP expressions are derived for several modulation schemes,including phase shift keying modulation( PSK),quadrature amplitude modulation( QAM),and pulse amplitude modulation( PAM). The exact channel capacity expressions are also presented. Then the ASEP and channel capacity performance under different conditions is evaluated through numerical simulations. The numerical simulation results coincide with the theoretical results well,and the accuracy of the analytical results is verified. Simulation results show that: the ASEP and channel capacity performance can be improved with the diversity branches increased,when SNR = 16 d B,the diversity branches L = 1,the ASEP with QPSK is 6 × 10- 2,the channel capacity is 4( bit / s) / Hz; the diversity branches L = 2,the ASEP is 1 × 10- 2,the channel capacity is 5. 1( bit/s) /Hz; the diversity branches L = 3,the ASEP is 2 × 10- 3,the channel capacity is 5. 8( bit/s) /Hz.