Research Article
Multiantenna detection of multicarrier primary signals exploiting spectral a priori information
@INPROCEEDINGS{10.1109/CROWNCOM.2009.5189134, author={Roberto L\^{o}pez-Valcarce and Gonzalo Vazquez-Vilar and Marcos \^{A}lvarez-D\^{\i}az}, title={Multiantenna detection of multicarrier primary signals exploiting spectral a priori information}, proceedings={4th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2009}, month={8}, keywords={Cognitive radio Detectors Diversity reception Fading Frequency estimation Frequency synchronization MIMO Monitoring Spectral shape Testing}, doi={10.1109/CROWNCOM.2009.5189134} }- Roberto López-Valcarce
Gonzalo Vazquez-Vilar
Marcos Álvarez-Díaz
Year: 2009
Multiantenna detection of multicarrier primary signals exploiting spectral a priori information
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2009.5189134
Abstract
We consider the problem of detecting a primary signal over a wireless channel by a multiantenna cognitive spectral monitor with knowledge of the spectral shape of primary transmissions employing multicarrier modulation. As a starting point, a Locally Most Powerful (LMP) test is derived for the single-antenna case. The asymptotic performance improvement of the LMP detector over the standard Energy Detector (ED) is quantified in terms of the primary spectral mask. For the case of an ideal bandpass mask the LMP test is Uniformly Most Powerful. With multiple antennas, optimal detectors require channel knowledge and therefore are not well suited to practical implementation. We propose a realizable multiantenna Incoherent Detector, and compare its performance with that of the ED and LMP single-antenna tests under both deterministic and Rayleigh slow-fading channel scenarios. In the latter setting, multiple antennas introduce detection diversity that determines the slope of the probability of miss curve, and thus the overall detection performance.