基于多用户反馈的星地协作传输系统性能分析

研究了门限设置反馈条件下多用户星地混合协作传输系统的性能。首先, 在中继端采用放大转发协议和多用户机会调度方案下, 得到系统的输出信噪比表达式。其次, 在卫星链路服从阴影莱斯分布和地面链路服从瑞利分布的情况下, 推导出基于门限设置的信道状态信息反馈下系统的反馈中断概率、遍历容量和平均反馈用户数的闭合表达式。最后, 计算机仿真不仅验证了理论分析的正确性, 而且证明了所提出的基于门限设置反馈的多用户调度方案在性能几乎不变的情况下, 显著降低了系统反馈量。

Performance analysis of a hybrid satellite-terrestrial cooperative networks with multiuser feedback

The performance of a multiuser hybrid satellite-terrestrial cooperative network(HSTCN)based on threshold-base multiuse feedback schem is investigated.By adopting the amplify-and-forward(AF)protocol in relay and multiuser opportunity scheduling scheme,the output signal to noise ratio(SNR)is obtained.Then,by assuming that the satellite links experience shadowing-Rician fading while the terrestrial links undergo Rayleigh fading,the closed-form expressions for feedback outage probability,ergodic capacity and the average number of feedback users with the threshold-based channel state information feedback method is derived.Finally,computer simulation not only verifies the correctness of the analytical results,but also proves that multiuser scheduling scheme with the threshold-based feedback can reduce the amount of system feedback greatly while the performance is almost unchanged.