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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。
In order to solve the problem of threshold optimization for cooperative spectrum sensing, the algorithm of diversity reception based on cooperative amplification of relay and repeater in Rayleigh fading channel is studied and analyzed. The average detection probability Pd is deduced for closed-end signal-to-noise ratio The detection threshold is optimized by the expression of average detection probability and average false alarm probability. The optimal detection threshold λopt under the two data merging methods is obtained through mathematical calculation and derivation. Simulation results of the derived expressions are validated by MATLAB simulation software. The simulation results show that the optimal detection threshold is not much different from the theoretical analysis, which provides a theoretical basis for the development of cooperative spectrum sensing technology.