一种基于功率限制下的认知无线电的频谱感知模型

摘要

cooperative spectrum sensing is designed to detect the presence of primary user accurately. we show the impacts of detection performance which are caused by path loss exponent, angleø and transmission power. Simulation results show that it’s hard for non-relay user to get better cooperative gain when the path loss exponentα2>α1. So cooperative scheme based on cooperative relay is not suitable for the system based on IEEE 802.22 at all.%文中在功率限制规则下提出了一种模型，考虑到了路径衰减指数、角度准、发射功率对检测性能的影响，更具有实际性和精确性。本文主要在路径衰减指数α2>α1时通过仿真合作增益方面分析了检测性能，同时考虑到角度ø、发射功率对检测性能的影响。通过仿真可以看出，在α2>α1的情况下很难得到较好的合作增益改善。从而得到基于合作中继的方法并不适用于IEEE802.22系统。