Works Published in 2008
Displaying works 61 - 80 of 303 in total
Sorted by most recent date added to the index first, which may not be the same as publication date order.
2008 conference paper
Energy-efficient adaptive mimo systems leveraging dynamic spare capacity
CISS 2008, The 42nd Annual Conference on Information Sciences and Systems, 68–73.
Contributors: H. Kim, C. Chae, G. De Veciana & R. Heath Jr.
TL;DR:
Extensive flow-level simulations under dynamic loads and Rayleigh fading channels confirm that the proposed technique can save more than 50 % of the mobile terminals' transmission energy and enable an effective tradeoff between performance and energy conservation.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2008 journal article
Coordinated beamforming with limited feedback in the MIMO broadcast channel
IEEE Journal on Selected Areas in Communications, 26(8), 1505–1515.
Contributors: C. Chae, D. Mazzarese*, N. Jindal* & R. Heath Jr.
TL;DR:
To enable practical implementation, a new limited feedback algorithm is proposed that exploits the structure of the algorithm to avoid full channel quantization and performs close to the sum capacity of the MIMO broadcast channel even with limited feedback.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
End-to-end antenna selection strategies for multi-hop relay channels
Conference Record - Asilomar Conference on Signals, Systems and Computers, 1506–1510.
Contributors: R. Vaze * & R. Heath Jr.
TL;DR:
A multiple stream end-to-end antenna selection strategy for full-duplex multi-hop relay channel is proposed, where multiple data streams are transmitted simultaneously using multiple paths from the source to the destination.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Coordinated beamforming for the multiuser MIMO broadcast channel with limited feedforward
IEEE Transactions on Signal Processing, 56(12), 6044–6056.
Contributors: C. Chae, D. Mazzarese*, T. Inoue & R. Heath Jr.
author keywords: Broadcast channels; interference suppression; multiple-input multiple-output (MIMO) systems
TL;DR:
Simulations show that the sum rate of the proposed methods using Grassmannian codebooks is close to the sum capacity of the MIMO broadcast channel, especially in the high signal-to-noise ratio (SNR) regime.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Computing the receive spatial correlation for a multi-cluster MIMO channel using different array configurations
GLOBECOM - IEEE Global Telecommunications Conference, 3959–3963.
Contributors: R. Bhagavatula* & R. Heath Jr.
TL;DR:
Analytical expressions are derived for the spatial correlation between the received signals of a ULA and uniform circular array without making any of the above mentioned assumptions and it is shown that the derived expression evaluates spatial correlation more accurately than the existing models.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Block diagonalization for multi-user MIMO with other-cell interference
IEEE Transactions on Wireless Communications, 7(7), 2671–2681.
Contributors: S. Shim*, J. Kwak *, R. Heath Jr. & J. Andrews *
author keywords: MIMO systems; broadcast channels; spatial filtering; interference suppression
TL;DR:
An OCI-aware enhancement to block diagonalization that uses a whitening filter for interference suppression at the receiver and a novel precoder using the interference-plus-noise covariance matrix for each user at the transmitter is presented.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Adaptive mode switching in the MIMO broadcast channel
2008 IEEE Radio and Wireless Symposium, RWS, 711–714.
Contributors: C. Lee, C. Chae, S. Vishwanath & R. Heath Jr.
author keywords: MIMO broadcast channels; partial channel state information; single user and multi-user transmissions
TL;DR:
This paper determines this mode switching point both analytically and numerically for a MIMO channel with transmit side correlation - when the number of users is below this point, single user transmission outperforms multi-user transmission, and the reverse is true when theNumber of users exceeds this critical value.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
A lattice-theoretic analysis of vector perturbation for multi-user MIMO systems
IEEE International Conference on Communications, 3340–3344.
Contributors: D. Ryan*, I. Collings *, I. Clarkson* & R. Heath Jr.
TL;DR:
This paper provides a new lattice-theoretic approach to analyze a multi-user technique known as vector perturbation and derives a concise approximation to the signal-to-noise ratio (SNR) at the output of the demodulator.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2008 journal article
A diversity guarantee and SNR performance for unitary limited feedback MIMO systems
Eurasip Journal on Advances in Signal Processing, 2008.
Contributors: B. Mondal* & R. Heath Jr.
TL;DR:
If the feedback per channel realization is greater than a threshold, then there is no loss of diversity due to quantization, and this result applies to both SM and STBC with unitary precoding and confirms some conjectures made about antenna subset selection with linear receivers.
(via Semantic Scholar)
asp-eurasipjournals.springeropen.com (publisher PDF)
Source: ORCID
Added: September 11, 2020
2008 journal article
An Overview of Limited Feedback in Wireless Communication Systems
IEEE Journal on Selected Areas in Communications, 26(8), 1341–1365.
author keywords: Wireless communications; Limited feedback; MIMO systems; Quantized precoding; Multiuser MIMO systems
TL;DR:
This tutorial provides a broad look at the field of limited feedback wireless communications, and reviews work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
A space-time receiver with joint synchronization and interference cancellation in asynchronous MIMO-OFDM systems
IEEE Transactions on Vehicular Technology, 57(5), 2991–3005.
Contributors: T. Tang & R. Heath*
author keywords: asynchronous; frequency offset; interference; multiple-input-multiple-output (MIMO) systems; orthogonal frequency-division multiplexing (OFDM)
TL;DR:
This paper introduces a novel space-time equalization algorithm based on the channel state information that aims to null the cochannel interference and combat asynchronism, as well as minimize a lower bound to the symbol error rate in the asynchronous MIMO-OFDM system.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
A low complexity linear multiuser MIMO beamforming system with limited feedback
CISS 2008, The 42nd Annual Conference on Information Sciences and Systems, 418–422.
Contributors: C. Chae *, D. Mazzarese*, N. Jindal* & R. Heath Jr.
TL;DR:
A low complexity linear multiuser beamforming system for the multiple-input multiple-output (MIMO) broadcast channel is proposed via the generalized eigenvector decomposition to jointly optimize transmit beamforming and receive combining vectors.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Block diagonalized vector perturbation for multiuser MIMO systems
IEEE Transactions on Wireless Communications, 7(11), 4051–4057.
Contributors: C. Chae *, S. Shim* & R. Heath Jr.
author keywords: MIMO systems; broadcast channels; nonlinear system; perturbation methods; spatial filtering; interference suppression
TL;DR:
A new multiuser MIMO algorithm that combines BD with vector perturbation (VP) is proposed that avoids the second training phase, reduces each user is receiver complexity thanks to pre-equalization with VP at the transmitter, and has comparable diversity performance to BD with maximum likelihood decoding algorithm.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
A supervised learning approach to adaptation in practical MIMO-OFDM wireless systems
GLOBECOM - IEEE Global Telecommunications Conference, 4583–4587.
Contributors: R. Daniels*, C. Caramanis* & R. Heath Jr.
Source: ORCID
Added: September 11, 2020
2008 conference paper
A new MIMO channel representation including spatial diversity, array orientation and depolarization effects
2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI.
Contributors: R. Bhagavatula*, R. Heath Jr. & C. Oestges *
TL;DR:
An analytical channel model that accounts for spatial, pattern, polarization diversities, channel depolarization, random mobile terminal orientations and mutual coupling effects is proposed.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Reference model parameter identification of space–time dependent reactivity in a CANDU-PHWR
Annals of Nuclear Energy, 35(2), 228–237.
Source: Crossref
Added: August 28, 2020
2008 journal article
Nanonails: A Simple Geometrical Approach to Electrically Tunable Superlyophobic Surfaces
Langmuir, 24(1), 9–14.
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation
(OpenAlex)
Sources: Crossref, ORCID
Added: August 28, 2020
2008 journal article
Green light emitting diodes on a-plane GaN bulk substrates
Applied Physics Letters, 92(24), 241109.
Source: Crossref
Added: August 28, 2020
2008 journal article
Fabrication and characterization of native non-polar GaN substrates
Journal of Crystal Growth, 310(17), 3953–3956.
author keywords: growth from vapor; single-crystal growth; nitrides
Source: Crossref
Added: August 28, 2020
2008 journal article
Enlargement of bulk non-polar GaN substrates by HVPE regrowth
Physica Status Solidi (c), 5(6), 1886–1888.
Source: Crossref
Added: August 28, 2020
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