基于能量检测的频谱感知技术研究与仿真

Study and Simulation of Spectrum Sensing Technology Based on Energy Detection

认知无线电是提高频谱资源利用率的有效手段,检测频谱空穴是否存在是实现认知无线电的前提和关键技术之一.对高斯白噪声信道下的单用户的能量检测和合作检测进行了理论和仿真研究.研究结果表明:单用户检测容易检测出信噪比较高的信号,随着信噪比的下降,单用户检测的检测性能急剧下降;在信噪比较低时,认知无线电用户之间进行联合检测可使检测系统的性能得到明显的改善.

Cognitive radio is considered as increasing the effective utilization of spectrum resources.Detecting spectrum holes is the prerequisite and key technologies to achieving cognitive radio.In this paper,the energy of single-user and cooperative spectrum sensing were studied and simulated in Gaussian white noise channel.Simulation results indicate that As SNR decreases,the detection performance drop sharply in single-user.Cognitive radio users collaborated with each other could apparently improve the detection performance with SNR decreasing.