Fading and shadowing in wireless systems

This book offers a comprehensive overview of fading and shadowing in wireless channels. A number of statistical models including simple, hybrid, compound and cascaded ones are presented along with a detailed discussion of diversity techniques employed to mitigate the effects of fading and shadowing. The effects of co-channel interference before and after the implementation of diversity are also analyzed. To facilitate easy understanding of the models and the analysis, the background on probability and random variables is presented with relevant derivations of densities of the sums, products, ratios as well as order statistics of random variables. The book also provides material on digital modems of interest in wireless systems. The updated edition expands the background materials on probability by offering sections on Laplace and Mellin transforms, parameter estimation, statistical testing and receiver operating characteristics. Newer models for fading, shadowing and shadowed fading are included along with the analysis of diversity combining algorithms. In addition, this edition contains a new chapter on Cognitive Radio. Based on the response from readers of the First Edition, detailed Matlab scripts used in the preparation of this edition are provided. Wherever necessary, Maple scripts used are also provided. • Covers detailed analysis of fading and shadowing as well as their mitigation that are critical to the improvement of reliable wireless communication capabilities; • Second edition provides additional background materials with sections on Laplace and Mellin transforms, parameter estimation (ML and MoM), statistical testing (chi square) and receiver operating characteristics – also offers newer models of fading and shadowing and a new chapter on cognitive radio; • New edition provides detailed Matlab and Maple scripts helpful to computational modeling and analysis of wireless systems adding a pedagogic component

Fading and Shadowing in Wireless Systems

In recent decades, growth in the field of wireless communications has led to an exponential rise in the number of journals catering to the research community. Still unmet, however, is the need to fully and comprehensively understand the effects of channel degradation brought on by the statistical fluctuations in the channel. These fluctuations mainly manifest as variations in signal power observed in the channel generally modeled using a variety of probability distributions, both in straight forms as well as in compound forms. While the former might explain some of the effects, it is the latter, namely, the compound models, which incorporate both short term and long term power fluctuations in the channel, explain the much more complex nature of the signals in these channels. Fading and Shadowing in Wireless Systems offers a pedagogical approach to the topic, with insight into the modeling and analysis of fading and shadowing. Beginning with statistical background and digital communications, the book is formulated to follow the details of modeling of the statistical fluctuations of signals in these channels. The author describes degradations in the channels arising from the statistical fluctuations in terms of various measures. This is followed by a discussion of diversity and associated signal processing algorithms to mitigate the effects of statistical fluctuations in the channel as well as quantitative measures of improvements brought on by diversity. The book also examines the effects of cochannel interference