Performance Analysis of Cyclic Preﬁxed Single-Carrier Spectrum Sharing Relay Systems in Primary User Interference
2012 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 60, no 12, 6729-6734 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
IEEE , 2012. Vol. 60, no 12, 6729-6734 p.
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.
IdentifiersURN: urn:nbn:se:bth-6885DOI: 10.1109/TSP.2012.2217138ISI: 000311805000053Local ID: oai:bth.se:forskinfo56F2B0B3C386404AC1257ACF003C30FEOAI: oai:DiVA.org:bth-6885DiVA: diva2:834439