H
Haralabos Papadopoulos
Researcher at NTT DoCoMo
Publications - 126
Citations - 4007
Haralabos Papadopoulos is an academic researcher from NTT DoCoMo. The author has contributed to research in topics: MIMO & Multi-user MIMO. The author has an hindex of 32, co-authored 126 publications receiving 3738 citations. Previous affiliations of Haralabos Papadopoulos include University of Southern California & Alcatel-Lucent.
Papers
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Journal ArticleDOI
Achieving "Massive MIMO" Spectral Efficiency with a Not-so-Large Number of Antennas
TL;DR: This paper proposes an improved Network-MIMO TDD architecture achieving spectral efficiencies comparable with "Massive MIMO", with one order of magnitude fewer antennas per active user per cell (roughly, from 500 to 50 antennas).
Proceedings ArticleDOI
5G 3GPP-Like Channel Models for Outdoor Urban Microcellular and Macrocellular Environments
Katsuyuki Haneda,Lei Tan,Yi Zheng,Henrik Asplund,Jian Li,Yi Wang,David Steer,Clara Li,Tommaso Balercia,Sunguk Lee,YoungSuk Kim,Amitava Ghosh,Timothy A. Thomas,Takehiro Nakamura,Yuichi Kakishima,Tetsuro Imai,Haralabos Papadopoulos,Theodore S. Rappaport,George R. MacCartney,Mathew K. Samimi,Shu Sun,Koymen Ozge,Sooyoung Hur,Jeong-Ho Park,Charlie Zhang,Evangelos Mellios,Andreas F. Molisch,Saeed S. Ghassamzadeh,Arun Ghosh +28 more
TL;DR: This document describes an initial 3D channel model which includes a baseline model for incorporating path loss, shadow fading, line of sight probability, penetration and blockage models for the typical scenarios of 5G channel models for bands up to 100 GHz.
Journal ArticleDOI
Scalable Synchronization and Reciprocity Calibration for Distributed Multiuser MIMO
Ryan Rogalin,Ozgun Y. Bursalioglu,Haralabos Papadopoulos,Giuseppe Caire,Andreas F. Molisch,Antonios Michaloliakos,V. Balan,Konstantinos Psounis +7 more
TL;DR: In this article, the authors proposed synchronization and calibration schemes for large-scale distributed multiuser MIMO (MU-MIMO) downlink networks, where the downlink channels can be learned from the user uplink pilot signals.
Patent
Multiple access cellular communication with dynamic slot allocation and reduced co-channel interference
TL;DR: In this paper, an apparatus and method reduces co-channel interference in multiple-access cellular communication systems in which frame time or frequency slots are allocated between uplink and downlink, where omnidirectional antenna or a set of directional antennas are used in each cell base station to communicate with users.
Posted Content
Scalable Synchronization and Reciprocity Calibration for Distributed Multiuser MIMO
Ryan Rogalin,Ozgun Y. Bursalioglu,Haralabos Papadopoulos,Giuseppe Caire,Andreas F. Molisch,Antonios Michaloliakos,V. Balan,Konstantinos Psounis +7 more
TL;DR: Novel over-the-air synchronization and calibration protocols that scale well with the network size are proposed and are shown to achieve sufficient accuracy for satisfactory distributed MU-MIMO performance.