基于最优中继的自适应协作频谱感知算法

针对认知系统中感知信道存在衰落和中继能耗较大问题，提出一种兼顾感知性能和感知能耗的中继协作频谱感知算法。该算法通过机会中继协作、基于效益函数的最优中继协作和系统参数自适应调整机制，能够获得性能与能耗的优化折中。文章对所提算法进行了详细的理论推导和性能分析，并对非中继协作感知算法和最优中继固定的协作感知算法以及本算法在不同系统参数下的感知性能进行了仿真比较。结果表明本算法具有一定的优越性。

An AIgorith m of Adaptive Cooperative Spectru m Sensing Based on Opti maI ReIay

An algorithm of adaptively cooperative spectrum sensing based on optimal relay was proposed,which can overcome the problems about fading of sensing channel and huge consumption of relaying.This algorithm was based on the consideration of sensing performance and energy consumption and obtained optimal tradeoff between performance and con-sumption by opportunistic relaying,benefit function based selection of optimal relay and mechanism of system parameters adjustment.Meanwhile,detailed theoretical formulas and performance analysis of the algorithm were given.And the compar-ative simulation of sensing performance of non-relay cooperative sensing algorithm,optimal relay fixed cooperative sensing algorithm and this algorithm under different system parameters were done as well.The results show that the proposed algo-rithm has certain advantages.