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Peppas K.P.,Institute of Informatics and Telecommunications
IEEE Wireless Communications Letters | Year: 2012

In this letter we propose a unified analytical expression for the average bit error probability of dual-hop amplify-and-forward relaying systems operating in the presence of both fast fading and shadowing. In order to provide a realistic end-to-end performance of the considered system we assume that both hops are subject to independent but not necessarily identically distributed Extended Generalized-\mathcal{K} fading. Our newly derived formula is obtained in terms of the bivariate H-Fox function. A computationally efficient algorithm to evaluate the average bit error probability is also proposed. The accuracy of the proposed method is substantiated by various numerically evaluated and computer simulation results. © 2012 IEEE.


Peppas K.P.,Institute of Informatics and Telecommunications
IEEE Transactions on Vehicular Technology | Year: 2012

In this paper, a generalized Laguerre polynomial expansion for the probability density function and the cumulative distribution function of the sum of independent nonidentically distributed squared κ-μ random variables is proposed. Based on these statistical results, we investigate the performance of maximal-ratio-combining diversity techniques operating over κ-μ fading channels with arbitrary fading parameters. Our newly derived formulas are mathematically tractable and include as special cases several results available in the technical literature, namely, those of Rice and Nakagami-m fading channels. The proposed analysis is substantiated by numerically evaluated results compared with Monte Carlo simulations. © 2011 IEEE.


Peppas K.P.,Institute of Informatics and Telecommunications | Datsikas C.K.,National and Kapodistrian University of Athens
Journal of Optical Communications and Networking | Year: 2010

Using an accurate exponential bound for the Gaussian Q-function, we derive simple approximate closed-form expressions for the average symbol error probability (ASEP) of a free-space optical communication link using subcarrier intensity modulation (SIM) with general-order rectangular quadrature amplitude modulation (QAM) over atmospheric turbulence channels. To model the atmospheric turbulence conditions, the log-normal and the gamma-gamma distribution are used. Extensive numerical and computer simulation results are presented in order to verify the accuracy of the proposed mathematical analysis. © 2010 Optical Society of America.


In this study, highly accurate closed-form approximations to the probability density function of the sum of independent identically distributed (i.i.d.) generalised-K fading envelopes are derived. These approximations are valid for a wide range of values of the distribution parameters and number of summands. Based on the previously derived formulas, simple precise approximations for the outage probability and the average bit error probability of equal-gain combining receivers operating on i.i.d. generalised-K fading channels are proposed. Extensive numerically evaluating and computer simulation results are presented to demonstrate the proposed analysis. © 2011 The Institution of Engineering and Technology.


Peppas K.P.,Institute of Informatics and Telecommunications
IEEE Transactions on Vehicular Technology | Year: 2013

This paper provides an analytical framework for the performance evaluation of dual-hop decode-and-forward (DF) cooperative systems operating over η-μ fading channels in the presence of cochannel interference (CCI) and additive white Gaussian noise (AWGN). The interferers are subject to independent but not necessarily identically distributed η-μ fading. For the considered system, assuming multiple interferers at both the relay and the destination, simple accurate analytical expressions for the outage probability (OP), average bit error probability (ABEP), and average capacity are derived. Various numerically evaluated results accompanied with Monte Carlo simulations are presented to corroborate the accuracy of the proposed approximations. © 2013 IEEE.

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