Exact Outage Probability of Opportunistic DF Relay Systems With Interference at Both the Relay and the Destination Over Nakagami- m Fading Channels

• Published in: IEEE transactions on vehicular technology Vol. 62; no. 2; pp. 920 - 927
• Main Authors: Salhab, A. M., Al-Qahtani, F., Zummo, S. A., Alnuweiri, H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.2013; Institute of Electrical and Electronics Engineers
• Subjects: Access methods and protocols, osi model; Applied sciences; Channels; Cochannel interference (CCI); Computer simulation; Connection and protection apparatus; Cooperative systems; decode-and-forward (DF); dual-hop networks; Electrical engineering. Electrical power engineering; Electrical power engineering; Encoding; Exact sciences and technology; Fading; Gain; Interference; Mathematical analysis; Monte Carlo methods; Nakagami- m fading; Operation. Load control. Reliability; opportunistic relaying; Outages; Power networks and lines; Relay; Relay systems; Relays; Signal to noise ratio; System performance; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmission and modulation (techniques and equipments); Performance evaluation; Relaying; Relay; decode-and-forward (DF); Cochannel interference; Diversity; Power system stability; Accuracy; Coding; Cochannel interference (CCI); Routing protocols; Fading channels; Monte Carlo method; dual-hop networks; Outage; Transmission protocol; opportunistic relaying; High value; Multihop network; Relay channel; Nakagami fading; Nakagami-m fading; Analytical method; Numerical simulation; Gain; Signal to noise ratio
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2012.2227866

In this paper, we investigate the outage behavior of a dual-hop opportunistic decode-and-forward (DF) relay system with cochannel interference (CCI) at both the relay and the destination. The source-relay and relay-destination channels and the interferers' channels at both the relay and the destination nodes are assumed to follow Nakagami- m distribution. Exact closed-form expressions for the outage probability for both independent nonidentically distributed (i.n.d.) and independent identically distributed (i.i.d.) cases of interferers' channels are derived in this paper. Furthermore, the system behavior at high SNR values is studied via deriving the asymptotic outage probability, and hence, the diversity order and the coding gain are characterized. Our results show that the cochannel interferers do not reduce the diversity gain of the system; instead, they degrade the outage performance by affecting the coding gain of the system. The accuracy of the analytical results is supported by Monte Carlo simulations.