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对于采用选择合并方案的分布式天线系统,当各分集支路经受独立且不等同分布的复合衰落时,分析了系统合并输出包络的平均电平交叉率和平均衰落持续时间,得到这些二阶统计量的精确表达式.该方法对于任意分集支路数目下的Rayleigh-lognormal,Ricean-lognormal和Nakagami-lognormal三种复合衰落环境均是有效的.仿真结果验证了所得表达式的正确性.
For the distributed antenna system using selective combining scheme, the average level crossover rate and average fading duration of the system combined output envelope are analyzed when each diversity branch is subjected to independent and unequal distribution of complex fading. These second order The exact expression of the statistics is validated by Rayleigh-lognormal, Ricean-lognormal and Nakagami-lognormal for any number of diversity branches.The simulation results verify the correctness of the obtained expressions.