现代电子技术2018，Vol.41Issue(7)：1-3,3.DOI:10.16652/j.issn.1004-373x.2018.07.001
快变信道环境下OFDM频谱感知算法
Spectrum sensing algorithm of OFDM signal in fast-varying channel environment
摘要
Abstract
Since the cognitive radio based on the assumption of a slowly-varying channel is unsuitable for the high-speed mobile scenario,an orthogonal frequency division multiplexing(OFDM)signal's spectrum sensing algorithm based on generalized likelihood ratio is proposed,in which the autocorrelation of OFDM signal is used to get the OFDM detection statistics.Its statistics distribution characteristic is studied to get the OFDM detection statistics of generalized likelihood ratio,and construct the fast-varying channel detection model for spectrum sensing. On the basis of the original algorithm,an improved algorithm of the generalized likelihood ratio is obtained by the approximate replacement of the variance of the detection statistics with the width of the detection window. The simulation results show that the two perception algorithms both have high recognition rate in the low signal-to-noise ratio and fast-varying channel environments,but the improved algorithm has stronger robustness against noise and interference.关键词
快变信道/正交频分复用/广义似然比/循环前缀/频谱感知/认知无线电Key words
fast-varying channel/orthogonal frequency division multiplexing/generalized likelihood ratio/cyclic prefix/spectrum sensing/cognitive radio分类
信息技术与安全科学引用本文复制引用
李月贞,陈少平..快变信道环境下OFDM频谱感知算法[J].现代电子技术,2018,41(7):1-3,3.基金项目
国家自然科学基金资助项目(60772031) Project Supported by National Natural Science Foundation of China(60772031) （60772031）
