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随着无线通信技术的飞速发展,无线电频谱资源日趋紧张。认知无线电已经成为解决现有频谱资源匮乏的非常有前途有前景的技术。认知无线电是一种智能的无线通信系统,它能够感知周围的无线环境,通过一定的方法相应地改变某些工作参数来实时地适应环境,从而达到提高频谱利用率、缓解频谱资源紧张的目的。频谱感知是认知无线电中最具挑战的问题之一。详细介绍了基于能量检测的频谱感知方法,并从理论上分析研究能量检测法的检测性能,最后通过MATLAB仿真分析能量检测法对于OFDM信号的检测性能。
With the rapid development of wireless communication technology, radio frequency spectrum resources are becoming increasingly tense. Cognitive radio has become a very promising and promising technology to solve the existing shortage of spectrum resources. Cognitive radio is an intelligent wireless communication system, which can sense the surrounding wireless environment and change certain working parameters in a certain way to adapt to the environment in real time, thus achieving the purpose of improving the spectrum utilization and alleviating the shortage of spectrum resources . Spectrum sensing is one of the most challenging issues in cognitive radio. The spectrum sensing method based on energy detection is introduced in detail, and the detection performance of energy detection method is theoretically analyzed. Finally, the performance of OFDM detection by energy detection method is analyzed by MATLAB.