Outage probability of single-carrier cooperative spectrum sharing systems with decode-and-forward relaying and selection combining
2013 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 12, no 2, 806-817 p.Article in journal (Refereed) Published
For cyclic prefixed single-carrier (CP-SC) spectrum sharing relaying systems, a two-hop decode-and-forward (DF) relaying protocol with a direct link and selection combining are employed in the secondary user relay network. For this cooperative CP-SC spectrum sharing system, the end-to-end signal-to-noise ratio (e2e-SNR) is first derived, and then the outage probability performance of the secondary user relaying system is investigated. Having derived an asymptotic expression for the cumulative distribution function of the e2e-SNR, the asymptotic outage diversity is obtained under a limited maximum transmit power at the secondary source and relay while satisfying the maximum allowable interference at the primary user. Notably, when the maximum allowable interference is independent of a limited transmission power, an outage probability floor is observed. Moreover, under the assumption of an unlimited transmit power at the secondary nodes, the asymptotic outage diversity is derived as a function of the interference. It can be seen that the same outage diversity gain can be achieved as in the non-spectrum-sharing CP-SC relaying system. Analytically derived asymptotic outage diversity gains for limited and unlimited transmission power cases are verified by Monte Carlo simulations.
Place, publisher, year, edition, pages
IEEE , 2013. Vol. 12, no 2, 806-817 p.
cognitive radio networks, interference constraint, outage probability, relay networks, signal-to-noise ratio, single-carrier system, Spectrum sharing
IdentifiersURN: urn:nbn:se:bth-6994DOI: 10.1109/TWC.2012.122212.120310ISI: 000316265300030Local ID: oai:bth.se:forskinfo4A4648A048F14722C1257B6400356BBAOAI: oai:DiVA.org:bth-6994DiVA: diva2:834557