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Wireless Personal Communications
Published in: Wireless Personal Communications 2/2013

01-09-2013

Non-intrusive Cognitive Radio Using Adaptive Nulls-Steering

Author: Wei-Chiang Wu

Published in: Wireless Personal Communications | Issue 2/2013

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Abstract

In this paper, we propose an adaptive non-intrusive cognitive radio network based on smart antenna technologies. The cognitive transmitter (CT), which is equipped with antenna array, first estimates and tracks the composite steering vectors of each primary (licensed) user. In what follows, CT forms transmit beamforming to place nulls to primary receivers based on the estimated spatial signatures. Moreover, we extensively analyze performance degradation caused by spatial signatures mismatch (estimation error) and verify that the proposed robust nulls-steering beamformer can comprehensively alleviate the mismatch effect. Simulation results demonstrate convergence of the proposed gradient-based recursive least squares algorithm. Furthermore, we have shown that outage probability can be kept extremely low under appropriate array size, which ensures the practicability of the proposed scheme.
previous article Distributed Transmission Power Control for Network Programming in Wireless Sensor Networks
next article Reduction of Power Fluctuation in ECMA-368 Ultra Wideband Communication Systems Using Multilayer Perceptron Neural Networks

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Metadata
Title
Non-intrusive Cognitive Radio Using Adaptive Nulls-Steering
Author
Wei-Chiang Wu
Publication date
01-09-2013
Publisher
Springer US
Published in
Wireless Personal Communications / Issue 2/2013
Print ISSN: 0929-6212
Electronic ISSN: 1572-834X
DOI
https://doi.org/10.1007/s11277-013-1095-y

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