基于高阶累积量的短波信道频谱感知技术

Research on spectrum sensing technique over HF channel based on the high-order cumulant

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。

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） algo- rithm is introduced for HF channel. Hence, the shortwave radio can inspect HF spectrum and make use of the leis- ure frequency reasonably to improve spectrum utilization. The numerical analysis and simulal：ion 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.