基于能量检测的2次协作频谱感知

Twice-cooperative Spectrum Sensing based on Energy Detection

为解决认知无线电系统中存在阴影效应、多径衰落、隐藏终端等问题,提出了协作频谱感知的概念。针对传统协作频谱感知需要较大的带宽来传输协作用户的感知信息问题,提出了一种基于能量检测的2次协作频谱感知方法。当能量值处于高低门限值之间时,它可以根据前一时刻的感知结果动态设置门限值,确定主用户的存在状态,解决了传统双门限能量检测中存在感知失败的问题,同时减少了传送到融合决策中心的感知信息,节省了传输带宽。仿真结果表明,该方法有效提高了协作频谱感知的检测概率,降低了漏检概率。

In order to solve shadow effect,multipath fading and hidden terminal in cognitive radio system,the concept of cooperative spectrum sensing is proposed. Aiming at the problem that the traditional cooperative spectrum sensing requires a fairly large bandwidth for transmitting the cooperative user＇s perceptual information, a twice-cooperative spectrum sensing method based on energy detection is proposed. And when the energy value is in between high and low threshold values, the threshold value may be dynamically set according to the perceived results of the previous time, thus to determine the existence state of the primary users, solve the problem of perceptual failure in the traditional double-threshold energy detection, reduce the perceived information transmitted to the fusion decision center, and thus save the transmission bandwidth. Simulation results indicate that the proposed method could effectively improve the detection probability of cooperative spectrum sensing and reduce the probability of missed detection.