Works Published in 2008
Displaying works 41 - 60 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
Perceptual soft thresholding using the structural similarity index
Proceedings - International Conference on Image Processing, ICIP, 569–572.
Contributors: S. Channappayya *, A. Bovik * & R. Heath Jr.
author keywords: Image denoising
TL;DR:
The visual quality of the images denoised using the proposed algorithm is shown to be higher compared to the MSE-optimal soft thresholding denoising solution, as measured by the SSIM Index.
(via Semantic Scholar)
citeseerx.ist.psu.edu (repository)
Source: ORCID
Added: September 11, 2020
2008 journal article
Optimization methodology for designing 2-CPAs exploiting pattern diversity in clustered MIMO channels
IEEE Transactions on Communications, 56(10), 1748–1759.
Contributors: A. Forenza & R. Heath*
author keywords: MIMO systems; antenna arrays; pattern diversity; microstrip antennas; spatially correlated channels
TL;DR:
This paper proposes a novel optimization methodology for designing circular patch arrays (CPAs), under a clustered MIMO channel model assumption, and finds that the single-cluster scenario can approximate CPA performance in clustered channels, reducing the number of channel scenarios that need to be considered.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Nonregenerative MIMO relaying with optimal transmit antenna selection
IEEE Signal Processing Letters, 15, 421–424.
Contributors: S. Peters* & R. Heath*
author keywords: antenna selection; cooperative systems; diversity methods; multiple-input multiple-output (MIMO) systems; relaying
TL;DR:
This work derives optimal SNR-based transmit antenna selection rules at the source and relay for the nonregenerative half-duplex MIMO relay channel and proposes methods for performing the necessary limited feedback.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Rethinking information theory for mobile ad hoc networks
IEEE Communications Magazine, 46(12), 94–101.
Contributors: J. Andrews *, S. Shakkottai *, R. Heath* , N. Jindal*, M. Haenggi *, R. Berry *, D. Guo *, M. Neely *
TL;DR:
For a theory to truly characterize the limits of deployed MANETs it must overcome three key roadblocks, spatial and timescale decompositions have not yet been developed for optimally modeling the spatial and temporal dynamics of wireless networks.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
9. Industry, Innovation and Infrastructure
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Progressive refinement for high resolution limited feedback multiuser MIMO beamforming
Conference Record - Asilomar Conference on Signals, Systems and Computers, 743–747.
Contributors: R. Heath Jr., T. Wu * & A. Soong*
TL;DR:
A progressive refinement concept that uses a base codebook quantization followed by a progressively scaled local codebook to enable high resolution quantization and reconstruction of channel state information in multiuser MIMO communication.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
MIMO relaying with linear processing for multiuser transmission in fixed relay networks
IEEE Transactions on Signal Processing, 56(2), 727–738.
author keywords: broadcast channels (BC); multiple-input multiple-output (MIMO) systems; multiuser channels; relays
TL;DR:
These bounds are used to motivate an implementable multiuser precoding strategy that combines Tomlinson-Harashima precoding at the base station and linear signal processing at the relay, adaptive stream selection, and QAM modulation.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Multiuser MIMO downlink with limited feedback using transmit-beam matching
IEEE International Conference on Communications, 3506–3510.
TL;DR:
This paper introduces a new method to mitigate the interference: transmit-beam matching, using multiple receive antennas, which minimizes the interspatial stream interference by each user's effective channel to the transmit- beam.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Multimode transmission for multiuser MIMO systems with block diagonalization
IEEE Transactions on Signal Processing, 56(7 II), 3294–3302.
Contributors: R. Chen*, Z. Shen *, J. Andrews * & R. Heath Jr.
author keywords: downlink; multiple-input-multiple-output (MIMO); multiuser; scheduling; sum capacity
TL;DR:
Two low-complexity near-optimal user/antenna selection algorithms are developed and demonstrate that the proposed algorithms achieve up to 98% of the sum throughput of the exhaustive search, for most system configurations, while the complexity is substantially reduced.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Kerdock codes for limited feedback MIMO systems
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 3113–3116.
Contributors: T. Inoue * & R. Heath Jr.
TL;DR:
This paper proposes a new codebook design based on Kerdock codes and mutually unbiased bases which enjoys performance similar to previously known codebooks and has systematic construction, reduced storage, and reduced online search computation.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Non-iterative multiuser MIMO coordinated beamforming with limited feedforward
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 2393–2396.
Contributors: C. Chae, T. Inoue, R. Heath Jr. & D. Mazzarese*
author keywords: MIMO systems; multiuser channels; space division; multiplexing
TL;DR:
Simulations show that the proposed methods using quantized codebooks approach the sum capacity of the MIMO broadcast channel.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Maximizing reliability in multi-hop wireless networks
IEEE International Symposium on Information Theory - Proceedings, 11–15.
Contributors: R. Vaze & R. Heath*
TL;DR:
COSTBC is shown to achieve the maximum diversity gain in a multi-hop wireless network with flat Rayleigh fading channels and it is shown that COSTBC requires minimum decoding complexity thanks to the connection to orthogonal space-time block codes.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 book
Joint Detection for Multi-Antenna Channels
In Advances in Multiuser Detection (pp. 311–364).
Contributors: A. Tulino *, M. Mckay *, J. Andrews *, I. Collings * & R. Heath*
TL;DR:
This research presents a new probabilistic approach to estimating the response of the immune system to laser-spot assisted, 3D image analysis that quantifies the importance of eye-tracking in the treatment of chronic pain.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
Machine learning for physical layer link adaptation in multiple-antenna wireless networks
Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM, 114–115.
Contributors: R. Daniels*, K. Mandke*, S. Peters*, S. Nettles* & R. Heath Jr.
TL;DR:
This implementation of physical layer link adaptation, or data rate selection, through machine learning on Hydra: an IEEE 802.11n draft standard multihop wireless networking prototype highlights both the utility of learning-based link adaptation in practical networks as well as the flexibility of Hydra.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 conference paper
MIMO receiver design in the presence of radio frequency interference
GLOBECOM - IEEE Global Telecommunications Conference, 3340–3344.
Contributors: K. Gulati*, A. Chopra *, R. Heath* , B. Evans *, K. Tinsley* & X. Lin*
TL;DR:
This paper considers the problem of receiver design for a two transmit, two receive antenna MIMO system in the presence of RFI, and shows significant improvement in symbol error rate performance of the proposed techniques over receivers designed assuming additive Gaussian noise.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Information outage probability and diversity order of alamouti transmit diversity in time-selective fading channels
IEEE Transactions on Vehicular Technology, 57(6), 3890–3895.
Contributors: H. Lee *, R. Heath Jr. & E. Powers*
author keywords: Alamouti transmit diversity; asymptotic diversity order; information outage probability; mutual information; time-selective fading channel
TL;DR:
From the theoretical and simulation results, it is demonstrated that, when the channel is time selective, the asymptotic diversity orders for the four detectors approach two, zero, one, and one, respectively.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Design and evaluation of a reconfigurable antenna array for MIMO systems
IEEE Transactions on Antennas and Propagation, 56(3), 869–881.
Contributors: D. Piazza*, N. Kirsch *, A. Forenza, R. Heath* & K. Dandekar *
author keywords: antenna measurements; multiple input multiple output (MIMO) systems; reconfigurable antennas; spatial correlation
TL;DR:
New reconfigurable antenna array is demonstrated for multiple input multiple output (MIMO) communication systems that improves link capacity in closely spaced antenna arrays that includes a new definition of spatial correlation coefficient to include the effects of antenna mismatch and radiation efficiency when quantifying the benefit of pattern diversity.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2008 journal article
Erratum: "SDMA with a sum feedback rate constraint" (IEEE Transactions on Signal Processing)
IEEE Transactions on Signal Processing, 56(8 I), 3800–3801.
Contributors: K. Huang *, R. Heath Jr. & J. Andrews *
TL;DR:
This correspondence corrects an error in the proof for theorem, the concavity of the logarithmic function was incorrectly applied to obtain the sum-rate lower bound even though it leads to an upper bound.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Design of linear equalizers optimized for the structural similarity index
IEEE Transactions on Image Processing, 17(6), 857–872.
Contributors: S. Channappayya *, A. Bovik *, C. Caramanis* & R. Heath Jr.
author keywords: equalizers; image restoration
MeSH headings : Algorithms; Computer Simulation; Image Enhancement / methods; Image Interpretation, Computer-Assisted / methods; Linear Models; Numerical Analysis, Computer-Assisted; Pattern Recognition, Automated / methods; Reproducibility of Results; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Subtraction Technique
TL;DR:
It is demonstrated that designing image processing algorithms, and, in particular, denoising and restoration-type algorithms, can yield significant gains over existing algorithms by optimizing them for perceptual distortion measures, and these gains may be obtained without significant increase in the computational complexity of the algorithm.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Constructing packings in grassmannian manifolds via alternating projection
Experimental Mathematics, 17(1), 9–35.
Contributors: I. Dhillon *, R. Heath* , T. Strohmer* & J. Tropp *
author keywords: combinatorial optimization; packing; projective spaces; Grassmannian spaces; Tarnmes' problem
TL;DR:
The alternating projection method can be used to produce packings of subspaces in real and complex Grassmannian spaces equipped with the Fubini–Study distance and can prove that some of the novel configurations constructed by the algorithm have packing diameters that are nearly optimal.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2008 journal article
Guest editorial exploiting limited feedback in tomorrow's wireless communication networks
IEEE Journal on Selected Areas in Communications, 26(8), 1337–1340.
TL;DR:
Channel state information at the transmitter can be optimized to provide higher link capacity and throughput, more efficiently share the channel with multiple users, increase range by exploiting diversity due to spatial and frequency selectivity, and simplify multi-user receivers through known interference cancellation.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
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