多用户环境下的认知协作通信系统性能分析

摘要

在存在多个主用户的环境下，提出一种新型的两跳式协作通信系统，并对系统的性能进行了分析。该系统在信宿处有多个次级用户接收机，并且采用信道参数最优的方式进行用户选择。在瑞利衰落信道下，对提出的协作通信系统的中断概率进行了研究，得出了中断概率的闭合表达式及在高信噪比时的渐进表达式。最后通过计算机仿真验证了其有效性，分析结果显示在多用户条件下系统的整体性能得到明显提高。%With multiple primary-user coexisting, a new dual-hop cognitive cooperative communication system is proposed and analyzed. In this proposed system, multiuser existed at the destination and the optimal channel coefficient scheme is adopted to improve the system performance. Moreover, the outage probability performance is investigated over Rayleigh fading channels and the exact closed-form expression is derived, then an asymptotic expression at high signal-to-noise for the outage probability is obtained too. Finally, simulation results are presented to verify that the system performance is improved with multiuser condition.