衰落信道下一种基于分集的两步协作频谱感知方法

A two-step cooperative spectrum sensing method based on diversity in fading channels

针对航空衰落信道下单天线单节点频谱感知性能恶化、多节点协作频谱感知传输信道存在误码的问题,提出了一种基于分集的两步协作频谱感知方法,以改善频谱感知性能,减少传输信道开销.首先给出了两步协作频谱感知的系统模型,然后分析了莱斯信道下基于平方律软合并的局部检测和基于空间分集增益的硬合并全局检测的检测性能.仿真结果表明,该方法降低了衰落型报告信道对检测性能的影响,提高了频谱检测的可靠性.

Aiming at the deterioration of single-antenna single-node spectrum sensing performance in the airborne fading channel and the bit error existing in the multi-node cooperative spectrum-aware transmission channel,this paper proposes a two-step cooperative spectral sensing method based on diversity so as to improve the spectrum sensing performance and reduce the transmission channel overhead.Firstly the paper presents the system model of a two-step cooperative spectrum sensing,and then analyzes the performance of local detection based on square-law soft merging in Rice channel and the performance of hard merging global detection based on spatial diversity gain.The simulation results show that the proposed method reduces the impact of the fading report channel on the detection performance and improves the reliability of spectrum detection.