基于自适应感知的OFDM宽带测控抗干扰方法
Systems Engineering and Electronics(2020)
Abstract
针对正交频分复用(orthogonal frequency-division multiplexing,OFDM)宽带测控中难以有效对抗干扰的问题,提出多门限的快速傅里叶变换(fast Fourier transform,FFT)和小波包联合自适应频谱感知来实现宽带OFDM频谱重构抗干扰.该方法首先通过固定双门限FFT能量感知进行带宽内高干噪比干扰初检测,然后通过自适应小波包频谱感知实现剩余低干噪比频宽内的干扰检测,最后根据频谱感知结果,对OFDM宽带测控系统的频谱进行重构,实现干扰规避.实验结果表明,感知算法方法具有较好的干扰检测性能,并能够实现OFDM宽带测控系统的有效抗干扰.
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