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Sensing Window Length Optimization in Low-SNR Regime

  • Liaoyuan Zeng
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 246)

Abstract

For non-coherent detection based cognitive radio (CR), the required length of the spectrum sensing window is inversely proportional to the primary user’s (PUs) signal strength. When a CR system’s transmission period is fixed, the length of the CR’s transmission window can be inadequate to fully utilize the white space if the corresponding PUs operate in low-SNR regime. We propose a sensing window optimization algorithm in this paper aiming at improving the spectral efficiency of the cognitive Ultra Wideband (UWB) radio system. The proposed algorithm can find the optimal tradeoff between the sensing window length and the desired detection probabilities for the UWB based CR system in low-SNR regime. Compared with the conventional sensing algorithms in which the sensing window is fixed, the proposed algorithm can significantly increase the length of the CR-UWB’s transmission window so as to use the available spectrum more efficiently while guaranteeing the PUs’ operation.

Keywords

Spectrum sensing window Cognitive radio Ultra wideband Low-SNR regime 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.University of Electronic Science and Technology of ChinaChengduChina

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