Spatial rank estimation in cognitive radio networks with uncalibrated multiple antennas

Authors:
Gonzalo Vazquez-Vilar;David Ramírez;Roberto López-Valcarce;Javier Vía;Ignacio Santamaría
Affiliations:
University of Vigo, Vigo, Spain;Universität Paderborn, Paderborn, Germany;University of Vigo, Vigo, Spain;University of Cantabria, Santander, Spain;University of Cantabria, Santander, Spain
Venue:
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Year:
2011

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Abstract

Spectrum sensing is a key component of the Cognitive Radio paradigm. Multiantenna detectors can exploit different spatial features of primary signals in order to boost detection performance and robustness in very low signal-to-noise ratios. However, in several cases these detectors require additional information, such as the rank of the spatial covariance matrix of the received signal. In this work we study the problem of estimating this rank under Gaussianity assumption using an uncalibrated receiver, i.e. with different (unknown) noise levels at each of the antennas.