tailieunhanh - Báo cáo hóa học: "SIR distribution analysis in cellular networks considering the joint impact of path-loss, shadowing and fast fading"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : SIR distribution analysis in cellular networks considering the joint impact of path-loss, shadowing and fast fading | Ben Cheikh et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 137 EURASIP Journal on . http content 2011 1 137 Wireless Communications and Networking a Springerữpen Journal RESEARCH Open Access SIR distribution analysis in cellular networks considering the joint impact of path-loss shadowing and fast fading Dorra Ben Cheikh1 2 Jean-Marc Kelif1 Marceau Coupechoux2 and Philippe Godlewski2 Abstract In this paper we propose an analysis of the joint impact of path-loss shadowing and fast fading on cellular networks. Two analytical methods are developed to express the outage probability. The first one based on the Fenton-Wilkinson approach approximates a sum of log-normal random variables by a log-normal random variable and approximates fast fading coefficients in interference terms by their average value. We denote it FWBM for Fenton-Wilkinson based method. The second one is based on the central limit theorem for causal functions. It allows to approximate a sum of positive random variables by a Gamma distribution. We denote it CLCFM for central limit theorem for causal functions method. Each method allows to establish a simple and easily computable outage probability formula which jointly takes into account path-loss shadowing and fast fading. We compute the outage probability for mobile stations located at any distance from their serving BS by using a fluid model network that considers the cellular network as a continuum of BS. We validate our approach by comparing all results to extensive Monte Carlo simulations performed in a traditional hexagonal network and we provide the limits of the two methods in terms of system parameters. The proposed framework is a powerful tool to study performances of cellular networks . OFDMA systems WiMAX LTE . 1 Introduction In this paper we are interested in characterizing the signal to interference ratio SIR distribution on the downlink of a cellular network. The SIR outage .