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Transmit Antenna Selection for Interference Management in Cognitive Relay Networks
Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
Vise andre og tillknytning
2014 (engelsk)Inngår i: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 63, nr 7, s. 3250-3262Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We propose transmit antenna selection (TAS) in decode-and-forward (DF) relaying as an effective approach to reduce the interference in underlay spectrum sharing networks with multiple primary users (PUs) and multiple antennas at the secondary users (SUs). We compare two distinct protocols: 1) TAS with receiver maximal-ratio combining (TAS/MRC) and 2) TAS with receiver selection combining (TAS/SC). For each protocol, we derive new closed-form expressions for the exact and asymptotic outage probability with independent Nakagami-m fading in the primary and secondary networks. Our results are valid for two scenarios related to the maximum SU transmit power, i.e., P, and the peak PU interference temperature, i.e., Q. When P is proportional to Q, our results confirm that TAS/MRC and TAS/SC relaying achieve the same full diversity gain. As such, the signal-to-noise ratio (SNR) advantage of TAS/MRC relaying relative to TAS/SC relaying is characterized as a simple ratio of their respective SNR gains. When P is independent of Q, we find that an outage floor is obtained in the large P regime where the SU transmit power is constrained by a fixed value of Q. This outage floor is accurately characterized by our exact and asymptotic results.

sted, utgiver, år, opplag, sider
IEEE Vehicular Technology Society , 2014. Vol. 63, nr 7, s. 3250-3262
Emneord [en]
Cognitive radio, relays, spectrum sharing
HSV kategori
Identifikatorer
URN: urn:nbn:se:bth-10719DOI: 10.1109/TVT.2014.2298387ISI: 000342422300024OAI: oai:DiVA.org:bth-10719DiVA, id: diva2:855568
Tilgjengelig fra: 2015-09-21 Laget: 2015-09-21 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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