放大转发双向中继网络的移动级联信道统计特征分析  

Statistical properties of mobile cascade channel in amplify-and-forward two-way relay networks

作　　者：刘海滨[1] 向良军[1] 袁继兵[1] 郑林华[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2014年第4期66-70,共5页Journal of National University of Defense Technology

摘　　要：针对放大转发协议下双向中继网络移动级联信道,为了分析其统计特征,结合用户完成信息交互的过程,将移动级联信道分解为传输部分和干扰部分两个时间过程。依据它们的双高斯乘积特点,分别给出了对应的一阶概率密度分布、二阶自相关函数和多普勒功率谱的表达式。与此同时,通过采用Gamma分布对级联信道进行了概率近似,得到了描述移动级联信道时变特性的电平通过率和平均衰落时间等指标的近似计算式。借助数值仿真验证了上述表达式的正确性。The statistical properties of mobile cascade channel in amplify-and-forward （AF） two-way relay networks （TWRN） is focused on. Based on the statistical properties of double Gaussian, the mobile cascade channel is divided into transmission and interference processes. In addition, the probability distribution functions （ PDF）, temporal auto-correlation functions （ACF） and Doppler spectrums of the two processes are derived, respectively. Furthermore, by approximating the PDFs of the cascade channel by the concise Ganuna distributions, closed-form and approximated expressions of two critical temporal merits, level-crossing rate （LCR） and average duration of fades （ADF）, are provided. Numerical simulation demonstrates the validity of the proposed expressions.

关 键 词：双向中继网络 移动级联信道估计 GAMMA分布 自相关函数 电平通过率 

分 类 号：TN911[电子电信—通信与信息系统]