Search Results - "Papadopoulos, H C"

Sequential signal encoding from noisy measurements using quantizers with dynamic bias control by Papadopoulos, H.C., Wornell, G.W., Oppenheim, A.V.

“…Signal estimation from a sequential encoding in the form of quantized noisy measurements is considered. As an example context, this problem arises in a number…”
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Distributed computation of averages over ad hoc networks by Scherber, D.S., Papadopoulos, H.C.

“…In this paper, we develop algorithms for distributed computation of averages of the node data over networks with arbitrary but fixed connectivity. The…”
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Physical-layer secrecy in AWGN via a class of chaotic DS/SS systems: analysis and design by Yongsun Hwang, Papadopoulos, H.C.

“…We study a class of pseudo-chaotic spread spectrum systems for secure communication over additive white Gaussian noise (AWGN) channels, whereby a symbol stream…”
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Reduction of mixed cochannel interference in microcellular shared time-division duplexing (STDD) systems by Papadopoulos, H.C., Sundberg, C.-E.W.

“…Shared time-division duplexing (STDD) is an attractive candidate for high-quality low-delay multiple access in microcellular systems. STDD provides a…”
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Shared time-division duplexing (STDD): impact of runlengths of dropped packets and fast-speech activity detection by Papadopoulos, H.C., Sundberg, C.-E.W.

“…Shared time-division duplexing (STDD) is a proposed high-quality low-delay multiple-access technique for microcellular systems. By sharing time slots in both…”
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Achieving "Massive MIMO" Spectral Efficiency with a Not-so-Large Number of Antennas by Hoon Huh, Caire, G., Papadopoulos, H. C., Ramprashad, S. A.

“…Time-Division Duplexing (TDD) allows to estimate the downlink channels for an arbitrarily large number of base station antennas from a finite number of…”
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Multiuser MISO Transmitter Optimization for Intercell Interference Mitigation by Hoon Huh, Papadopoulos, H C, Caire, G

“…The transmitter optimization (i.e., steering vectors and power allocation) for a MISO broadcast channel subject to general linear constraints is considered…”
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P1321 A case of multiple levels of ventricular obstruction by Oikonomidis, D, Klitirinos, A, Koutouzis, M, Kalangos, A, Lazaris, E, Papadopoulos, C H

“…Abstract Subaortic stenosis (SAS) is a rare entity in adults with unclear etiology and variable presentation. SAS may be presented with symptoms mimicking…”
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Maximum-likelihood estimation of a class of chaotic signals by Papadopoulos, H.E., Wornell, G.W.

“…The chaotic sequences corresponding to tent map dynamics are potentially attractive in a range of engineering applications. Optimal estimation algorithms for…”
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New Type of Single Chain Magnet: Pseudo-One-Dimensional Chain of High-Spin Co(II) Exhibiting Ferromagnetic Intrachain Interactions by Tangoulis, V, Lalia-Kantouri, M, Gdaniec, M, Papadopoulos, Ch, Miletic, V, Czapik, A

“…Two new six-coordinated high-spin Co(II) complexes have been synthesized through the reactions of Co(II) salts with dipyridylamine (dpamH) and…”
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Postcanceling techniques for simultaneous broadcasting of analog FM and digital data by Papadopoulos, H.C., Sundberg, C.-E.W.

“…We consider simultaneous broadcasting of low-power digital data and analog FM and present reliable receivers for the digital data. Due to the relatively low…”
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Simultaneous broadcasting of analog FM and digital audio signals by means of adaptive precanceling techniques by Papadopoulos, H.C., Sunberg, C.-E.W.

“…A method for broadcasting digital audio simultaneously with existing analog frequency modulation (FM) radio is presented. The method is based on precomputing…”
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First implantation of the pulsatile left ventricular assist device iVAC2L in a heart failure patient infected with influenza type A by Tzikas, S., Papadopoulos, C.H., Evangeliou, A.P., Vassilikos, V.

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Distributed source localization algorithms for acoustic ad-hoc sensor networks by Pham, T., Scherber, D.S., Papadopoulos, H.C.

“…In this paper, we develop and evaluate distributed implementations of source localization estimators from energy-based measurements obtained via an ad-hoc…”
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Improved Blind Interference Alignment in a Cellular Environment Using Power Allocation and Cell-Based Clusters by Chenwei Wang, Papadopoulos, H. C., Ramprashad, S. A., Caire, G.

“…Fundamentally, benefits of Multiple Input Multiple Output (MIMO) in wireless systems rest on increasing the number of Degrees of Freedom (DoFs) that can be…”
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Beamforming Algorithms for Information Relaying in Wireless Sensor Networks by Abdallah, M.M., Papadopoulos, H.C.

“…We develop beamforming algorithms for information relaying over shared slowly nonselective fading channels in wireless sensor networks. We assume that, prior…”
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A Joint Scheduling and Cell Clustering Scheme for MU-MIMO Downlink with Limited Coordination by Ramprashad, S A, Caire, G, Papadopoulos, H C

“…In next-generation cellular systems, Multi-User MIMO (MU-MIMO) schemes are expected to achieve very high downlink throughput, provided that issues such as…”
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Achieving large spectral efficiencies from MU-MIMO with tens of antennas: Location-adaptive TDD MU-MIMO design and user scheduling by Papadopoulos, H C, Caire, G, Ramprashad, S A

“…We consider schemes for joint scheduling training and downlink MU-MIMO in multi-cell deployments that can yield high cell and cell-edge throughputs with tens…”
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Towards improving LTE SU/MU-MIMO performance: Issues in channel estimation, interpolation and feedback by Bursalioglu, O. Y., Ramprashad, S. A., Papadopoulos, H. C.

“…We consider improvements to the throughput performance of Single-User MIMO (SU-MIMO) and Multi-User MIMO (MU-MIMO) in the present 3GPP Long Term Evolution…”
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Precoded Modulo-Precanceling Systems for Simulcasting Analog FM and Digital Data by Papadopoulos, H.C., Sundberg, C.-E.W.

“…We present techniques for simulcasting low-power digital data and analog FM over fading channels. Our methods have strong connections to what are referred to…”
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