Zobrazeno 1 - 10
of 24
pro vyhledávání: '"George A. Ropokis"'
Autor:
George A. Ropokis, Petros S. Bithas
Publikováno v:
IEEE Transactions on Vehicular Technology. 71:8574-8590
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9ac3a45ad8d69e5a65f26e8d86a47ad
https://doi.org/10.1109/tvt.2022.3173127
https://doi.org/10.1109/tvt.2022.3173127
Autor:
George A. Ropokis
Publikováno v:
2021 International Balkan Conference on Communications and Networking (BalkanCom).
We focus on the problem of optimal power allocation for a two user interference channel characterized by mixed Channel State Information (CSI), which includes instantaneous information for the direct channels and statistical information for the inter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::55f9512adf34321037d5811c4cfe75f3
https://doi.org/10.1109/balkancom53780.2021.9593257
https://doi.org/10.1109/balkancom53780.2021.9593257
Publikováno v:
IEEE Transactions on Communications. 66:3623-3637
We investigate the problem of beamformer design for communications systems coexisting with legacy radar systems with mechanically rotating antennas. Based on measurement campaign findings that support the assumption of fast decoherence for the radar-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca172810f4a6f94b5b684644b0c571f8
https://doi.org/10.1109/tcomm.2018.2817543
https://doi.org/10.1109/tcomm.2018.2817543
Autor:
George A. Ropokis
Publikováno v:
WiMob
We focus on the problem of rate-optimal beamforming for wireless powered cooperative communications systems. We consider the case of systems employing multiple wireless powered Amplify and Forward self-energy recycling relays and relay selection. By
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::387bc221f1bbc4108bbaf4d6b2312de2
https://doi.org/10.1109/wimob.2019.8923314
https://doi.org/10.1109/wimob.2019.8923314
Publikováno v:
IEEE International Conference on Communications (ICC), Workshop on IoT
IEEE International Conference on Communications (ICC), Workshop on IoT, May 2019, Shanghai, China. ⟨10.1109/ICCW.2019.8756759⟩
ICC Workshops
IEEE International Conference on Communications (ICC), Workshop on IoT, May 2019, Shanghai, China. ⟨10.1109/ICCW.2019.8756759⟩
ICC Workshops
Battery-powered sensors deployed in the Internet of Things (IoT) require energy-efficient solutions to prolong their lifetime. When these sensors observe a physical phenomenon distributed in space and evolving in time, the collected observations are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6847ff3f991c680961a4a38a78673a27
http://arxiv.org/abs/1902.02850
http://arxiv.org/abs/1902.02850
Publikováno v:
ICT
We propose and investigate a communications scheme for exploiting multiple Amplify and Forward (AF) relays using the principle of energy recycling. For this scheme, we consider concurrent use of the multiple relays, and study the problem of rate-opti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b278eb353cd50131254065d09290140c
https://doi.org/10.1109/ict.2018.8464947
https://doi.org/10.1109/ict.2018.8464947
A Comparative Performance Analysis of Interweave and Underlay Multi-Antenna Cognitive Radio Networks
Publikováno v:
IEEE Transactions on Wireless Communications. 14:2911-2925
In this paper, an analytical performance study for multi-antenna Cognitive Radio (CR) systems is presented. The two most popular CR approaches, namely, the interweave and underlay system designs, are considered and based on the derived analytical fra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::242872efd1ccd0c81991f868da32ee62
https://doi.org/10.1109/twc.2015.2396519
https://doi.org/10.1109/twc.2015.2396519
Publikováno v:
WCNC Workshops
We investigate the problem of optimal power allocation for energy recycling cooperative communications systems, employing full duplex relays, based on the criterion of maximizing the rate, or equivalently the Signal to Noise Ratio (SNR), of the syste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::933ff6933afc9ce4b06c63b5e3a665e4
https://eprints.gla.ac.uk/155231/1/155231.pdf
https://eprints.gla.ac.uk/155231/1/155231.pdf
Autor:
Valerio Frascolla, P. Takis Mathiopoulos, Athanasios A. Rontogiannis, George A. Ropokis, Miltiades C. Filippou, Luiz A. DaSilva, Nicola Marchetti
Publikováno v:
SPAWC
We investigate the performance of a hybrid, opportunistic/underlay Licensed Shared Access (LSA) system, in the presence of Spectrum Sensing (SS) and Channel Estimation (CE) uncertainties, and derive a simple closed form expression for the system's Bi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92e81da2b1c9504f4d86af4a50dc0727
https://doi.org/10.1109/spawc.2016.7536899
https://doi.org/10.1109/spawc.2016.7536899
Autor:
Fotis Foukalas, George A. Ropokis
Publikováno v:
WCNC
The Energy Efficiency (EE) of Carrier Aggregation (CA) enabled communications systems is studied. In more detail, the problem of the optimal power allocation for CA enabled systems exploiting multiple Parallel Frequency Bands (PFBs) is addressed base
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63c4c0782a37eea430d9d9e80b0162fc
https://hdl.handle.net/10576/21101
https://hdl.handle.net/10576/21101