Enhanced FCME Thresholding for Wavelet-Based Cognitive UWB over Fading Channels

ETRI Journal

关键词: wavelet packet transform;    spectrum sensing;    forward consecutive mean excision;    cognitive ultra-wideband;    Channel fading;   

Others  :  1186034
DOI  :  10.4218/etrij.11.0211.0046

【 摘 要 】

The cognitive ultra-wideband (UWB) network detects interfering narrowband systems and adapts its configuration accordingly. An inherently adaptive and flexible candidate for cognitive UWB transmission is the wavelet packet multicarrier modulation (WPMCM). In this letter, we use an enhanced forward consecutive mean excision thresholding algorithm to tackle the noise uncertainty in the wavelet-based sensing of WPMCM systems, and mathematical analysis is performed for primary user channel fading. As a benchmark, we compare the proposed system with a conventional fast Fourier transformation-based system, and performance investigation proves significant improvements when primary and secondary links are subjected to multipath fading and noise.

   

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