Benefits of improper signaling for underlay cognitive radio

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URI: http://hdl.handle.net/10902/9510
ISSN: 2162-2337
ISSN: 2162-2345
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Autoría
Lameiro Gutiérrez, ChristianAutoridad Unican; Santamaría Caballero, Luis IgnacioAutoridad Unican; Schreier, Peter J.
Fecha
2015-02
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© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publicado en
IEEE Wireless Communications Letters, 2015, 4(1), 22 - 25
Editorial
Institute of Electrical and Electronics Engineers, Inc.
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Palabras clave
Cognitive radio
Interference channel
Improper signaling
Asymmetric complex signaling
Resumen/Abstract
In this letter we study the potential benefits of improper signaling for a secondary user (SU) in underlay cognitive radio networks. We consider a basic yet illustrative scenario in which the primary user (PU) always transmit proper Gaussian signals and has a minimum rate constraint. After parameterizing the SU transmit signal in terms of its power and circularity coefficient (which measures the degree of impropriety), we prove that the SU improves its rate by transmitting improper signals only when the ratio of the squared modulus between the SU-PU interference link and the SU direct link exceeds a given threshold. As a by-product of this analysis, we obtain the optimal circularity coefficient that must be used by the SU depending on its power budget. Some simulation results show that the SU benefits from the transmission of improper signals especially when the PU is not highly loaded.
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