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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: System outage probability analysis in uplink multi-hop cellular systems over composite channels | Zhao et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 35 http jwcn.eurasipjournals.eom content 2011 1 35 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access System outage probability analysis in uplink multi-hop cellular systems over composite channels Xibin Zhao1 2 3 Jun-Bo Wang1 4 5 Jin-Yuan Wang4 Ming Chen5 Min Feng4 and Ming Sheng4 Abstract Owing to its superior performances the multi-hop cellular system has drawn much attention in recent years. This paper aims to study the uplink system outage probability of the multi-hop cellular system over composite channels. Initially we consider a composite channel model which takes path loss lognormal shadowing and Nakagami-m fading into account. Then based on the amplify-and-forward relaying the signal-to-noise ratio of each link is investigated. Further an expression of the outage probability for a mobile station MS over a given position is derived after employing selective transmission scheme. After that considering the distribution of MSs in the cellular systems a numerical expression of the system outage probability is further obtained. Numerical results prove that the derived expression of the system outage probability can provide very good approximation to the realistic outage performance without time-intensive simulations. Moreover it s also shown that the muilti-hop cellular system in this paper outperforms the conventional cellular system in terms of outage probability. Keywords multi-hop cellular system system outage probability composite channel amplify-and-forward relaying selective transmission 1. Introduction The next generation wireless communication systems will provide very high data rates and support various multimedia applications. However due to the limitation of the available transmission resources the inherent problems of limited capacity and coverage in conventional cellular system are hard to overcome. In the past few .