Multiantenna Spectrum Sensing in the Presence of Multiple Primary Users over Fading and Nonfading Channels
The basis of this paper is Wei and Tirkkonen, 2012, in which expressions for the key performance metrics of the sphericity test applied to the multiantenna cooperative spectrum sensing of multiple primary transmitters in cognitive radio networks over nonfading channels are provided. The false alarm...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2015-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2015/165935 |
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| Summary: | The basis of this paper is Wei and Tirkkonen, 2012, in which expressions for the key performance metrics of
the sphericity test applied to the multiantenna cooperative spectrum sensing of multiple primary
transmitters in cognitive radio networks over nonfading channels are provided. The false alarm and
the detection probabilities were derived in Wei and Tirkkonen, 2012, based on approximations obtained by matching the
moments of the test statistics to the Beta distribution. In this paper we show that the model adopted
in Wei and Tirkkonen, 2012, does not apply directly to fading channels, yet being considerably inaccurate for some system
parameters and channel conditions. Nevertheless, we show that the original expressions from Wei and Tirkkonen, 2012, can
be simply and accurately applied to a modified model that considers fixed or time-varying channels
with any fading statistic. We also analyze the performance of the sphericity test and other competing
detectors with a varying number of primary transmitters, considering different situations in terms
of the channel gains and channel dynamics. Based on our results, we correct several interpretations
from Wei and Tirkkonen, 2012, in what concerns the performance of the detectors, both over a fixed-gain additive white
Gaussian noise channel and over a time-varying Rayleigh fading channel. |
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| ISSN: | 1687-5869 1687-5877 |