Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks

Details Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks

2008-01-19

arxiv.org/abs/0801.3049v1

Computer Science

Information Theory

To appear in the Proceedings of the 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas,

Scientific paper

10.1109/TSP.2008.2008540

Spectrum sensing is an essential functionality that enables cognitive radios to detect spectral holes and opportunistically use under-utilized frequency bands without causing harmful interference to primary networks. Since individual cognitive radios might not be able to reliably detect weak primary signals due to channel fading/shadowing, this paper proposes a cooperative wideband spectrum sensing scheme, referred to as spatial-spectral joint detection, which is based on a linear combination of the local statistics from spatially distributed multiple cognitive radios. The cooperative sensing problem is formulated into an optimization problem, for which suboptimal but efficient solutions can be obtained through mathematical transformation under practical conditions.

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