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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 ,并且最大比合并总是优于选择合并
The diversity performance of diversity branches with different correlations under Rayleigh fading is studied. The study of the diversity strategy is to combine the maximum ratio and select the combination, using the Monte Carlo method to simulate the probability of the system output signal to noise ratio exceeds the threshold. The results show that under the maximum ratio combination, when the average signal-to-noise ratio of each channel is smaller than the threshold (about - 4d B for two channels and about - 13d B for three channels) The greater the probability of the noise ratio exceeding the threshold. In other cases, the more independent the diversity branches, the better the diversity effect, and the ratio of the merger is always better than the merger