SDC接收系统在n-Rayleigh信道下的性能分析  

Performance analysis of switched diversity combining receiving system under n-Rayleigh fading channels

作　　者：徐凌伟[1] 张浩[1,2] 吕婷婷[1] 施威[3] Gulliver T A 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100 [2]加拿大维多利亚大学电子与计算机工程学院 [3]青岛科技大学信息科学与技术学院,山东青岛266061

出　　处：《计算机工程与应用》2015年第8期1-5,41,共6页Computer Engineering and Applications

基　　金：国家自然科学基金(No.60902005;No.61304222);山东省自然科学基金(No.ZR2012FQ021);山东省高等学校科技计划项目(No.J12LN88);青岛市国际科技合作项目(No.12-1-4-137-hz)

摘　　要：在n-Rayleigh信道下,研究了切换合并接收系统的平均符号误码率和中断概率性能。基于信噪比的概率密度函数的方法,推导了切换合并接收系统在n-Rayleigh衰落信道上采用q进制相移键控调制,和脉冲幅度调制的平均符号误码率的精确和近似表达式。同时,也得到了中断概率的精确闭合表达式。对不同系统条件下的平均符号误码率和中断概率性能做了数值仿真,验证了理论分析结果的正确性。仿真结果表明:分集支路数L,衰弱因子n,以及切换门限rth对系统的平均符号误码率和中断概率性能有着重要的影响。The Average Symbol Error Probability（ASEP）and Outage Probability（OP）of the Switched Diversity Com-bining（SDC）receiving system under n-Rayleigh fading channels are investigated in this paper. Based on the method of the Probability Density Function（PDF）of the Signal-to-Noise Ratio（SNR）, the exact and approximate expressions of the ASEP are derived for several q-ary modulation schemes, including Phase Shift Keying modulation（PSK）, and Pulse Ampli-tude Modulation（PAM）. The exact closed form expressions of OP are also presented. Then the ASEP and OP perfor-mance under different conditions is evaluated through numerical simulations, and the accuracy of the analytical results is verified. The simulation results show that the diversity branches L, the fading factor n, and the switching threshold rth have an important influence on the ASEP and OP performance.

关 键 词：切换合并 n-Rayleigh信道 概率密度函数 平均符号误码率 中断概率 

分 类 号：TN929.5[电子电信—通信与信息系统]