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中文摘要：
循环谱检测方法能在较低信噪比下检测信号,频移滤波（FREquency-Shift）滤波器具有很好的抑制噪声能力。文中在循环谱检测信号之前,引入频移滤波技术,在循环频率域对信号进行滤波,以降低噪声对信号的影响,从而提高循环谱对信号的检测能力。仿真结果表明,本文方法可以在-15.5dB下检测到直扩信号和-8.5dB下估计伪码速率。
英文摘要：
Signals with cyclostationary property can be detected using cyclic spectrum in low SNR. FRESH （FREqueJ Shift） filter adequately exploits the spectrum correlation property of the signal to improve the SNR. FRESH filter introduced before signal detection. FRESH filter could suppress noise and interference in the cyclic frequency domain, wh resulted in the improved SNR. Simulations show that combined the FRESH filter with cyclic spectrum direct sequence spr snectrum signals can be detected in -15.5dB, and the rate of spreading code can be estimated in 8.5dB.
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