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针对认知无线电的核心问题——频谱感知,采用性能好的协作频谱感知,这里研究了认知无线电系统中一种多天线协作频谱感知方案,此方案中的噪声信号和主用户的信号均认为是独立复高斯随机信号。同时,次用户将检测到的信号通过波束成形后传向融合中心,而优化函数为发射功率受限的条件下,最大化全局的检测概率。理论推导和方针结果表明,所提出的方案有效地提高了检查概率,充分发挥了空间分集和多用户分集的优势,普遍提高了系统的感知概率。
Aiming at the core problem of cognitive radio-spectrum sensing, the cooperative spectrum sensing with good performance is used. A multi-antenna cooperative spectrum sensing scheme in cognitive radio system is studied here. Both the noise signal and the signal of the primary user in this scheme are considered Is an independent complex Gaussian random signal. At the same time, the secondary user passes the detected signal to the fusion center through beamforming, while the optimization function maximizes the global detection probability under the condition of limited transmission power. The theoretical derivation and the results show that the proposed scheme can effectively improve the detection probability, give full play to the advantages of space diversity and multi-user diversity, and generally improve the system’s perceived probability.