基于干扰温度的多用户MIMO频谱共享系统容量分析

Analysis of Capacity of Multi-User MIMO Spectrum Sharing System Based on Interference Temperature

在无线通信认知无线电中,频谱共享系统被证实能够提供更高的频谱利用率。考虑到多用户多天线的频谱共享系统中次用户的发射功率受限于主用户的干扰温度,介绍了单天线系统和3种不同MIMO传输机制,并根据SNR分别推导出具体的容量表达式。最后通过仿真得出ST/SC方式能够获得最佳容量,而STBC方式应用于频谱共享系统没有提升容量的优势。

In the cognitive radio of wireless communication, spectrum sharing system is confimaed to provide higher spectrum efficiency. Because the transmission power of secondary users is limited by interference temperature of main users in multi-user multi-antenna spectrum sharing system, the single antenna system and three different MIMO transmission mechanisms are introduced, and the specific capacity expression is deduced according to SNR. At last, the simulation shows that ST/SC method can get the best capacity, while STBC applied to the spectrum sharing system can not increase the system capacity.