Cognitive Relay Networks With Multiple Primary Transceivers Under Spectrum-Sharing

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Quang Trung Duong, Phee Lep Yeoh, Nguyen Quoc Bao Vo, Maged Elkashlan, Nan Yang
Title: Cognitive Relay Networks With Multiple Primary Transceivers Under Spectrum-Sharing
Journal: IEEE Signal Processing Letters
Year: 2012
Volume: 19
Issue: 11
Pagination: 741-744
ISSN: 1070-9908
Publisher: IEEE
URI/DOI: 10.1109/LSP.2012.2217327
ISI number: 000308963900008
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Language: English
Abstract: We examine the impact of multiple primary transmitters and receivers (PU-TxRx) on the outage performance of cognitive decode-and-forward relay networks. In such a joint relaying/spectrum-sharing arrangement, we address fundamental questions concerning three key power constraints: 1) maximum transmit power at the secondary transmitter (SU-Tx), 2) peak interference power at the primary receivers (PU-Rx), and 3) interference power at SU-Rx caused by the primary transmitter (PU-Tx). Our answers to these are given in new analytical expressions for the exact and asymptotic outage probability of the secondary relay network. Based on our asymptotic expressions, important design insights into the impact of primary transceivers on the performance of cognitive relay networks is reached. We have shown that zero diversity order is attained when the peak interference power at the PU-Rx is independent of the maximum transmit power at the SU-TX.
Subject: Signal Processing\General
Keywords: Cognitive radio, DF relays, spectrum-sharing
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