基于AF中继的协作频谱感知检测门限优化

摘要

为解决协作频谱感知技术检测门限优化的问题,研究分析在瑞丽衰落信道中基于放大转发中继的协作频谱感知的分集接收的算法,推导平均检测概率(Pd)关于端到端信噪比的闭合表达式;通过平均检测概率和平均虚警概率的表达式对检测门限进行优化,通过数学演算与推导得出在两种数据合并的方法下的最优检测门限λopt的表达式.通过MATLAB仿真软件对推导出的表达式进行仿真验证,仿真结果表明,该最优检测门限值与理论分析值的值相差不大,为协作频谱感知技术的发展提供了理论依据.%To solve the problem of optimal detection thresholds in cooperative spectrum sensing, the algorithm of receiver diversity in cooperative spectrum sensing based on amplify and forward (AF) relaying was researched in Rayleigh fading channels.And the closed-form expression for the average detection probability (Pd) about end to end signal to noise ratio (SNR) was derived.Detection thresholds were optimized through the expressions of average detection probability and average false alarm probability, and the expressions of optimal detection thresholds λopt were derived through mathematics and deduction.The derived expressions were verified by simulation software MATLAB.Results of simulation show that optimal detection thresholds value nearly is the same as the theoretically analyzed values, which provides theory basis for the development of cooperative spectrum sensing.