Performance Analysis of Cyclic Prefixed Single-Carrier Spectrum Sharing Relay Systems in Primary User Interference

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Kyeong Jin Kim, Quang Trung Duong, H. Vincent Poor, Lei Shu
Title: Performance Analysis of Cyclic Prefixed Single-Carrier Spectrum Sharing Relay Systems in Primary User Interference
Journal: IEEE Transaction on Signal Processing
Year: 2012
Volume: 60
Issue: 12
Pagination: 6729 - 6734
ISSN: 1053-587X
Publisher: IEEE
URI/DOI: 10.1109/TSP.2012.2217138
ISI number: 000311805000053
Organization: Blekinge Institute of Technology
Department: School of Computing (Sektionen för datavetenskap och kommunikation)
School of Computing S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/com
Authors e-mail: quang.trung.duong@bth.se
Language: English
Abstract: For cyclic prefixed single-carrier (CP-SC) spectrum sharing
relay systems, the joint impact of the primary transmitter and primary receiver on the performance of secondary networks is investigated. A two-hop amplify-and-forward (AF) relay protocol is employed, and then
its end-to-end signal-to-interference-ratio (e2e-SIR) is defined. An upper bound on the cumulative distribution function (CDF) of this e2e-SIR is derived for the CP-SC system. Having investigated an asymptotic expression for the CDF, the asymptotic outage diversity and coding gain can be obtained. Also, under a total transmission constraint, a suboptimal
power allocation (sub-OPA) is derived for approximately minimizing the asymptotic outage probability. Monte Carlo simulations verify the derived outage probability and its asymptotic diversity gain with and without power allocation. It is shown that the primary transmitter has a major impact on the secondary network performance. Importantly, it is observed that when the interference from the primary transmitter proportionally increases with the interference power constraint at the primary receiver, the spectrum-sharing system results in no diversity gain for the full range
of the SIR.
Subject: Telecommunications\General
Keywords: Cyclic prefixed single-carrier (CP-SC) cognitive relay system, primary user interference, spectrum-sharing, end-to-end signal-to-interference-ratio, outage probability, asymptotic outage diversity, optimal power allocation.
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