对Rayleigh相关信道的分集性能研究

Diversity performance on correlated Rayleigh fading channels

研究了在 Rayleigh衰落下具有不同相关性的分集支路的分集性能。研究的分集策略是最大比合并和选择合并 ,采用 Monte Carlo方法仿真了系统输出信噪比超过门限的概率。结果表明 :在最大比合并下 ,当各路平均信噪比与门限相比较小时 (两路时约为 - 4d B,三路时约为- 13d B) ,各分集支路越相关 ,输出信噪比超过门限的概率越大。在其他情况下 ,各分集支路越独立 ,分集效果越好 。

The Diversity performance of correlated Rayleigh fading channels was investigated. The Monte Carlo method was used to study the probability that the output SNR exceeds the given threshold for diversity schemes such as maximum ratio combining and selection combining. In maximal ratio combining, when each branch's average SNR is relatively small compared to the threshold (-4dB or so for two branches and -13dB or so for 3 branches), our results show that the probability that the output SNR exceeds the given threshold grows as the correlation coefficient increases. For other conditions, the probability increases is the correlation coefficient decreases.