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A generic and novel distribution, referred to as Nâˆ—Nakagami, constructed as the product of N statistically independent, but not necessarily identically distributed, Nakagami-m random variables (RVs),â€¦ (More)

- Nikos C. Sagias, George K. Karagiannidis
- IEEE Transactions on Information Theory
- 2005

Ascertaining on the suitability of the Weibull distribution to model fading channels, a theoretical framework for a class of multivariate Weibull distributions, originated from Gaussian randomâ€¦ (More)

- George K. Karagiannidis, Theodoros A. Tsiftsis, Ranjan K. Mallik
- IEEE Transactions on Communications
- 2006

We present closed-form lower bounds for the performance of multihop transmissions with nonregenerative relays over not necessarily identically distributed Nakagami-m fading channels. The end-to-endâ€¦ (More)

- Petros S. Bithas, Nikos C. Sagias, P. Takis Mathiopoulos, George K. Karagiannidis, Athanasios A. Rontogiannis
- IEEE Communications Letters
- 2006

The performance of digital communication systems over generalized-K (K/sub G/) fading channels is analyzed and evaluated. Novel closed form expressions for the SNR statistics, the average Shannon'sâ€¦ (More)

- Diomidis S. Michalopoulos, George K. Karagiannidis
- IEEE Transactions on Wireless Communications
- 2008

We provide closed-form expressions for the outage and bit error probability (BEP) of uncoded, threshold-based opportunistic relaying (OR) and selection cooperation (SC), at arbitrary signal to noiseâ€¦ (More)

- Diomidis S. Michalopoulos, Himal A. Suraweera, George K. Karagiannidis, Robert Schober
- IEEE Transactions on Communications
- 2012

We study the effect of outdated channel state information on the outage and error rate performance of amplify-and-forward (AF) relay selection, where only one out of the set of available relays isâ€¦ (More)

- George K. Karagiannidis, Dimitris A. Zogas, Stavros A. Kotsopoulos
- IEEE Trans. Wireless Communications
- 2003

In this letter, an efficient approach for the evaluation of the Nakagamimultivariate probability density function (pdf) and cumulative distribution function (cdf) with arbitrary correlation isâ€¦ (More)

- George K. Karagiannidis, Dimitris A. Zogas, Stavros A. Kotsopoulos
- IEEE Trans. Communications
- 2003

In this letter, capitalizing on the proof of a theorem presented by Blumenson and Miller many years ago, a useful closed formula for the exponentially correlated -variate Nakagamiprobability densityâ€¦ (More)

- Theodoros A. Tsiftsis, Harilaos G. Sandalidis, George K. Karagiannidis, Murat Uysal
- IEEE Transactions on Wireless Communications
- 2009

Optical wireless, also known as free-space optics, has received much attention in recent years as a cost-effective, license-free and wide-bandwidth access technique for high data rates applications.â€¦ (More)

- George K. Karagiannidis
- IEEE Communications Letters
- 2006

Recently, Beaulieu, following an ingenious concept, presented a closed-form expression for a useful integral, which was used for the evaluation of the symbol error probability (SEP) of general orderâ€¦ (More)