Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Efrem, Christos N."'
Autor:
Efrem, Christos N., Krikidis, Ioannis
In this letter, we study a discrete optimization problem, namely, the maximization of channel capacity in fluid multiple-input multiple-output (fluid-MIMO) systems through the selection of antenna ports/positions at both the transmitter and the recei
Externí odkaz:
http://arxiv.org/abs/2404.06072
Autor:
Efrem, Christos N.
In this paper, the joint distribution of the sum and maximum of independent, not necessarily identically distributed, nonnegative random variables is studied for two cases: i) continuous and ii) discrete random variables. First, a recursive formula o
Externí odkaz:
http://arxiv.org/abs/2309.10548
Autor:
Efrem, Christos N., Krikidis, Ioannis
In this paper, we study an intelligent reflecting surface (IRS)-aided communication system with single-antenna transmitter and receiver, under imperfect channel state information (CSI). More specifically, we deal with the robust selection of binary (
Externí odkaz:
http://arxiv.org/abs/2309.08526
Autor:
Efrem, Christos N., Krikidis, Ioannis
In this paper, we study an intelligent reflecting surface (IRS) assisted communication system with single-antenna transmitter and receiver, under imperfect channel state information (CSI). More specifically, we deal with the robust selection of binar
Externí odkaz:
http://arxiv.org/abs/2210.16662
Autor:
Efrem, Christos N., Krikidis, Ioannis
Intelligent reflecting surfaces (IRSs) have emerged as a promising wireless technology for the dynamic configuration and control of electromagnetic waves, thus creating a smart (programmable) radio environment. In this context, we study a multi-IRS a
Externí odkaz:
http://arxiv.org/abs/2202.11602
Publikováno v:
IEEE Wireless Communications Letters, vol. 10, no. 2, pp. 378-382, Feb. 2021
In this letter, we study the optimum selection of ground stations (GSs) in RF/optical satellite networks (SatNets) in order to minimize the overall installation cost under an outage probability requirement, assuming independent weather conditions bet
Externí odkaz:
http://arxiv.org/abs/2005.07498
Publikováno v:
IEEE Transactions on Aerospace and Electronic Systems, vol. 57, no. 1, pp. 476-484, Feb. 2021
The utilization of extremely high frequency (EHF) bands can achieve very high throughput in satellite networks (SatNets). Nevertheless, the severe rain attenuation at EHF bands imposes strict limitations on the system availability. Smart gateway dive
Externí odkaz:
http://arxiv.org/abs/2003.06786
Akademický článek
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Publikováno v:
IEEE Wireless Communications Letters, vol. 9, no. 7, pp. 1101-1104, July 2020
The availability of satellite communication systems is extremely limited by atmospheric impairments, such as rain (for radio frequencies) and cloud coverage (for optical frequencies). A solution to this problem is the site diversity technique, where
Externí odkaz:
http://arxiv.org/abs/1912.12911
Publikováno v:
IEEE Wireless Communications Letters, vol. 9, no. 2, pp. 228-231, Feb. 2020
Power consumption is a major limitation in the downlink of multibeam satellite systems, since it has a significant impact on the mass and lifetime of the satellite. In this context, we study a new energy-aware power allocation problem that aims to jo
Externí odkaz:
http://arxiv.org/abs/1912.00920