基于高阶累积量的短波信道频谱感知技术

摘要

In view of the shortage of spectrum resources in HF communication, using the cognitive radio technology and the high-order cumulant characteristics of the modulation signals, a high-order cumulant detection (HCD) algorithm is introduced for HF channel. Hence, the shortwave radio can inspect HF spectrum and make use of the leisure frequency reasonably to improve spectrum utilization. The numerical analysis and simulation results show that this algorithm can effectively deal with the multi-path delay and Doppler spread of HF channel and detect signals correctly under low SNR.%针对短波通信中频谱资源紧缺,利用认知无线电技术和调制信号的高阶累积量特性,提出一种适合短波信道的高阶累积量频谱感知方法,对短波频段进行监测,以合理利用空闲频段,提高频谱利用率.数值分析与仿真结果表明,该算法能够有效地克服短波信道多径时延和多普勒扩展的影响,在低信噪比下达到较高的检测概率.