tailieunhanh - Báo cáo hóa học: " ´ On the Use of Pade Approximation for Performance Evaluation of Maximal Ratio Combining Diversity over Weibull Fading Channels"

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: ´ On the Use of Pade Approximation for Performance Evaluation of Maximal Ratio Combining Diversity over Weibull Fading Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 58501 Pages 1-7 DOI WCN 2006 58501 On the Use of Pade Approximation for Performance Evaluation of Maximal Ratio Combining Diversity over Weibull Fading Channels Mahmoud H. Ismail and Mustafa M. Matalgah Department of Electrical Engineering Center for Wireless Communications The University of Mississippi University MS 38677-1848 USA Received 1 April 2005 Revised 18 August 2005 Accepted 11 October 2005 Recommended for Publication by Peter Djuric We use the Pade approximation PA technique to obtain closed-form approximate expressions for the moment-generating function MGF of the Weibull random variable. Unlike previously obtained closed-form exact expressions for the MGF which are relatively complicated as being given in terms of the Meijer G-function PA can be used to obtain simple rational expressions for the MGF which can be easily used in further computations. We illustrate the accuracy of the PA technique by comparing its results to either the existing exact MGF or to that obtained via Monte Carlo simulations. Using the approximate expressions we analyze the performance of digital modulation schemes over the single channel and the multichannels employing maximal ratio combining MRC under the Weibull fading assumption. Our results show excellent agreement with previously published results as well as with simulations. Copyright 2006 M. H. Ismail and M. M. Matalgah. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The use of the Weibull distribution as a statistical model that better describes the actual short term fading phenomenon over outdoor as well as indoor wireless channels has been proposed decades ago 1-3 . More recently the appropriateness of the Weibull .

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