说明：  双向协作通信的中断概率仿真，结果和《Performance Analysis of Two-Hop Relayed Transmissions over Rayleigh Fading Channels》里面的结论完全一样。可以得到三幅图。
(Two-way collaborative communication outage probability simulation， results and 《Performance Analysis of Two-Hop Relayed Transmissions over the Rayleigh Fading Channels 》，the conclusion is exactly the same. You can get three in Fig.)