基于STBC方案的鲁棒性协作频谱感知技术

Robust Cooperative Spectrum Sensing Based on STBC Scheme

协作频谱感知技术可削弱认知无线电系统中衰落阴影等对检测信道的影响.基于对空时分组编码(STBC)固定分组协作频谱感知技术的分析,提出了鲁棒性的动态分组方案以克服固定分组的局限性,最大限度地发挥STBC方案的优势,提升系统的检测性能.该方案利用认知用户间的交互信道条件进行动态分组,以获得更小的虚警概率下界.理论分析和仿真结果表明,本文所提出的方案在衰落信道环境下可显著提高系统的检测性能.

Cooperative spectrum sensing aims to alleviate the influence of the severe fading or shadowing to the detection channels in cognitive radio systems. Based on the analysis of the space-time block coding （STBC） based fixed clustering cooperative spectrum sensing scheme, this paper proposes a robust dynamic clustering scheme to overcome the limitations of the fixed clustering scheme. The proposed scheme can take advantage of STBC scheme and improve the system sensing performance. It utilizes the conditions of inter-user channels to realize the dynamic clustering and achieves the lower bound of false alarm probability. Theoretical analysis and simulation results show that the proposed scheme improves the system sensing performance significantly over fading channels.