OFDM信号的相关比软合作检测

多用户合作检测是认知无线电用户用来提高对基本用户检测能力的重要手段。为了提高相关比检测在低信噪比下的检测性能,提出了一种基于相关比检测的软合作检测方法,该方法能够有效地检测出OFDM类型的基本信号。分析和仿真结果表明,这种方法不仅继承了相关比检测的恒虚警特性,而且检测性能大大提高,对噪声的鲁棒性也更强了。与能量检测的比较显示,该方法能够在不增加复杂度的情况下,在更低信噪比条件下工作,对噪声特性没有要求,非常适合应用于认知无线电技术。

Soft cooperative detection of OFDM signals based on correlation ratio test

Mult i-user cooper at ive detect ion plays an important role in enhancing the detectio n capability of co gnit ive radio users. In order to enhance the detect io n per formance o f anto corr elat ion test under low SNR, a so ft co operat ive detect ion based on corr elat ion ratio test w as propo sed for effect ive detect ion of primary signals in OFDM type. This coo perat io n no t only r etained the nature o f constant false alarm rate ( CFAR) , but also impro ved the detect ion perfo rmance and increased the robustness. Energ y detection co nt rast show s that this metho d can operate in low er SNR condit ions w ithout addit ional complex ity . Therefo re, this cooper ation scheme is suitable for the applicat io n in cog nit ive radio technolog y.