基于独立非同分布广义K信道的OSTBC-MIMO系统及性能  

Performance analysis of OSTBC-MIMO systems over i.n.i.d. generalized-K fading channels

作　　者：何杰[1] 肖琨[1] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004

出　　处：《计算机应用》2016年第9期2390-2395,共6页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61362015);广西自然科学基金资助项目(2014GXNSFAA118397);广西无线宽带通信与信号处理重点实验室开放基金资助项目(GXKL0614202)~~

摘　　要：针对独立非同分布(i.n.i.d.)广义K衰落信道中的正交空时分组编码多输入多输出(OSTBC-MIMO)系统性能问题,建立了采用M-QAM调制的OSTBC-MIMO系统在i.n.i.d广义K衰落信道中的系统模型。利用接收端等效信噪比(SNR)可以近似为两个由多个独立伽马随机变量之和构成的随机变量的乘积这一关系,推导出近似等效信噪比的概率密度函数表达式,继而推导得到平均符号差错概率、中断概率和容量的闭式。仿真结果表明:除波形参数m外,k取任意不同正整数值也会对系统性能产生重要的影响,OSTBC-MIMO系统在i.n.i.d.广义K衰落信道中的性能与在独立同分布(i.i.d.)广义K衰落信道中的性能存在显著差别。Concerning the performance of the Orthogonal Space Time Block Code based Multiple-Input Multiple-Output （OSTBC-MIMO） system over independent but not necessarily identically distributed （i. n. i. d. ） generalized-K fading channels, the system model of the OSTBC-MIMO system was established in i. n. i. d. generalized-K fading channel by adopting M-QAM modulation scheme. The equivalent Signal-to-Noise Ratio （SNR） of the receiver was approximated by the product of two variables that composed of multiple independent Gamma distributed random variables. On the basis of that, the probability density function expression of the equivalent SNR was derived as well as the expression of the average symbol error probability, channel capacity and outage probability. The simulation results show that, in addition to the parameter m, the parameter k also has a significant impact on the overall system performance, which produces the non-negligible differences on the system performance between the i. n. i. d. generalized-K fading channels and the i. i. d. generalized-K fading channels.

关 键 词：中断概率 容量 符号差错概率 广义K衰落信道 正交空时分组编码 

分 类 号：TN915.01[电子电信—通信与信息系统]