一种基于可靠度的频谱感知算法

Reliability based spectrum sensing algorithms for primary detection in cognitive radio

认知无线电系统中频谱感知的作用是有能力以尽量快且准确地确定是否有主用户存在。为了达到这个要求,提出了一种通过考虑感知结果可靠性的频谱感知算法。只有当认知同户的感知结果具有足够的可靠性时,才将其判决的二进制结果(0或1)直接发送到MAC层;否则,该认知用户同一阶特征技术重新检测该频段。由于一阶特征检测技术是在时域完成的,因此提出的算法具有实时操作和低功耗等优点。对提出的基于可靠性的频谱感知算法的感知性能进行理论分析研究,并对其进行了仿真。仿真结果表明:提出的这种频谱感知算法能够大大改善频谱感知性能相比于传统的能量检测器和一阶特征检测技术。

One of the main requirements of cognitive radio system is the ability to detect the presence of the primary user with precise accuracy. To achieve that goal, a spectrum sensing scheme considering the reliability of spectrum sensing was proposed. The sensing performance of the method was derived for both AWGN and Rayleigh fading channels. Results indicate that the proposed method can better improve sensing performance than the conventional energy detector.