多用户卫星通信系统的中断性能分析

针对卫星通信系统，分析了基于门限判断放大转发(amplify-and-forward, AF)协议情况下的系统中断性能。首先,考虑星载天线增益和卫星链路损耗,并假设卫星链路的小尺度衰落服从阴影莱斯(shadowed-Rician, SR)分布,推导出多用户卫星通信系统的中断概率闭合表达式。然后，为了便于进一步分析系统的性能,推导出高信噪比(signal noise ratio, SNR)条件下系统中断概率的渐近表达式,得到系统的分集度和编码增益的解析表达式。最后,计算机仿真验证了理论分析的正确性,并分析了用户数和信道参数对多用户卫星通信系统性能的影响,从而为实际系统设计提供了参考和依据。

Outage performance analysis for multi-user satellite communication system

Focusing on the multi-user satellite communication system, the outage performance of the system under the condition of the amplify-and-forward (AF) protocol based on the threshold judgment is analyzed. Firstly, taking the satellite antenna gain and satellite path loss into account, assuming that the small scale fading of satellite link obeys shadowed-Rician (SR) distribution, the closed-form expression of outage probability for the multi-user satellite communication system is derived. Then, in order to further analyze the performance of the system, the asymptotic expression of the outage probability at high signal noise ratio (SNR) is derived, and the analytic expressions of the diversity order and coding gain of the system are obtained. Finally, the computer simulations verify the validity of the theoretical analysis, and analyze the influence of the number of users and channel parameters on the performance for the multi-user satellite communication system, which provides a guide and basis for the design of actual system.