基于AF协作的多中继M2M通信系统的SER性能分析

SER analysis of cooperative M2M communications assisted by multiple AF relays

基于移动端对移动端(M2M)信道衰落服从重叠Nakagami-m分布的假设,研究M-PSK调制下移动放大转发(AF)中继对M2M系统的性能影响。利用矩母函数(MGF)方法,推导了多AF中继辅助M2M通信(MAF-M2M)系统的误符号率(SER)性能下界表达式,并结合近似概率密度函数(PDF)方法,给出了更为逼近的近似SER表达式。结果表明,目的端采用最大比合并时,AF中继可以明显改善不同m参数信道下M2M通信系统性能。计算机仿真结果验证了性能界和近似SER的正确性。

For the mobile-to-mobile （M2M） communication assisted by multiple mobile amplify-and-forward （AF） relays （MAF-M2M）, the lower bound of SER with M-PSK was derived by using the MGF approach, where a generalized cascaded Nakagami-m channel model was used to provide a realistic description of the M2M channel. A more asymptotic SER expression was also derived by combining with an approximated PDF method. It was shown that the performance of M2M communication systems over channels with different parameter m can be obviously improved if AF relays are used. The simulated SER curves prove the rightness of the derived lower bound and approximated SER expressions.