基于中继协作的认知无线电性能研究

频谱感知是认知无线电技术的关键。协作频谱感知能够充分利用网络资源,提高网络中认知用户的检测概率,降低认知用户的虚警概率。基于两个认知用户之间的中继协作,研究了协作频谱感知的感知性能与吞吐量的折衷。仿真结果表明：中继协作的频谱感知方法能够使得在充分保证对授权用户不造成干扰即检测概率一定时,能够有效地降低认知用户感知授权用户的虚警概率,缩短＂弱＂认知用户获得最大吞吐量的最优感知时间,提高其最大吞吐量,并提高认知系统的最大吞吐量。

Study on Performance of Relay Cognitive Radio

Spectrum sensing is the key technology of cognitive radio.Cooperative sensing can make good use of network resource,raise the probability of detection while lower the probability of false alarm.This paper discusses the tradeoff between sensing performance and throughput based on the relay cooperation of two cognitive user.Simulation results show that the relay method could lower the probability of false alarm,effectively reduce optimal sensing time of the worse cognitive user in achieving the maximal throughput,and improve the maximum throughput of the secondary network under the constraint that the primary user is sufficiently protected.