复合衰落信道的衰落统计分析
doi: 10.3724/SP.J.1146.2006.01244
Fade Statistics in Composite Fading Channels
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摘要: 该文基于条件概率密度方法分析复合衰落信道下接收信号包络及其导数的联合概率密度函数，由此得到了复合衰落信道的平均电平交叉率和平均衰落持续时间的统一表达式，最后结合高斯-厄米特积分给出Rayleigh-Lognormal, Ricean-Lognormal, Nakagami-Lognormal 3种典型复合衰落下接收包络的概率密度函数、累积分布函数、平均电平交叉率、平均衰落持续时间的近似解析式。仿真结果验证了理论分析的正确性。Abstract: The Joint Probability Density Function (JPDF) of signal envelope and its derivative, which is subjected to composite fading, is analyzed by means of conditional probability density. New uniform expressions for the average Level Crossing Rate (LCR) and Average Fade Duration (AFD) of signal envelope are derived using the above obtained JPDF, then some results of the PDF, Cumulative Distribution Function (CDF), average LCR and AFD of signal envelopes, characterized by Rayleigh-Lognormal, Ricean-Lognormal, Nakagami-Lognormal fading models, are derived via Gauss-Hermite quadrature. Simulation results validate the correctness of these expressions.
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