116 citations · 185 across the 24 of their papers we have counts for
9 papers · 1 filter
Power-Optimal HARQ Protocol for Reliable Free Space Optical Communication
Georgios D. Chondrogiannis, Nikos A. Mitsiou, Nestor D. Chatzidiamantis +2
This paper investigates the usage of hybrid automatic repeat request (HARQ) protocols for power-efficient and reliable communications over free space optical (FSO) links. By exploi…
Capacity and Algorithms for a Cognitive Network with Primary-Secondary User Cooperation
Athanasios Papadopoulos, Nestor D. Chatzidiamantis, Leonidas Georgiadis
In this work, we examine cognitive radio networks, where secondary users may act as relays for messages sent by the primary user, hence offering performance improvement of primary…
Spectrum Sensing with Multiple Primary Users over Fading Channels
Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis, George K. Karagiannidis
We investigate the impact of multiple primary users (PUs) and fading on the spectrum sensing of a classical energy detector (ED). Specifically, we present novel closed-form express…
Spectrum Sensing Under Hardware Constraints
Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis, George K. Karagiannidis
Direct-conversion radio (DCR) receivers can offer highly integrated low-cost hardware solutions for spectrum sensing in cognitive radio systems. However, DCR receivers are suscepti…
Error Performance of Multidimensional Lattice Constellations-Part II: Evaluation over Fading Channels
Koralia N. Pappi, Nestor D. Chatzidiamantis, George K. Karagiannidis
This is the second part of a two-part series of papers, where the error performance of multidimensional lattice constellations with signal space diversity (SSD) is investigated. In…
Error Performance of Multidimensional Lattice Constellations-Part I: A Parallelotope Geometry Based Approach for the AWGN Channel
Koralia N. Pappi, Nestor D. Chatzidiamantis, George K. Karagiannidis
Multidimensional lattice constellations which present signal space diversity (SSD) have been extensively studied for single-antenna transmission over fading channels, with focus on…