Works Published in 2012
Displaying works 61 - 80 of 391 in total
Sorted by most recent date added to the index first, which may not be the same as publication date order.
2012 conference paper
Online learning for quality-driven unequal protection of scalable video
IEEE International Workshop on Machine Learning for Signal Processing, MLSP.
Contributors: A. Khalek*, C. Caramanis* & R. Heath*
TL;DR:
The proposed online algorithm uses local linear regression to learn the mapping between packet losses from each scalable video layer and quality degradation without assuming an underlying statistical model, and provably guarantees an average target video quality level and converges rapidly to a stable solution.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
On the limitations of cooperation in wireless networks
2012 Information Theory and Applications Workshop, ITA 2012 - Conference Proceedings, 123–130.
Contributors: A. Lozano *, J. Andrews * & R. Heath*
TL;DR:
It is shown that even perfect cooperation cannot in general change an interference-limited network to a noise-limited one, and the existence of a spectral efficiency upper bound that does not grow with P is shown.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 journal article
Link adaptation with position/motion information in vehicle-to-vehicle networks
IEEE Transactions on Wireless Communications, 11(2), 505–509.
Contributors: R. Daniels* & R. Heath Jr.
author keywords: Adaptive modulation and coding; GPS; link adaptation; PNT; vehicular communication; wireless fingerprinting
TL;DR:
It is shown, through the definition of new large-scale coherence expressions, that channel measurements render large- scale coherence as a function of time-change while the position/motion measurements render coherenceAs a functionof velocity-change.
(via Semantic Scholar)
citeseerx.ist.psu.edu (repository)
Source: ORCID
Added: September 11, 2020
2012 journal article
Introduction to the issue on signal processing in heterogeneous networks for future broadband wireless systems
IEEE Journal on Selected Topics in Signal Processing, 6(3), 213–215.
Contributors: R. Heath Jr., M. Debbah *, E. Larsson *, D. Kim *, H. Viswanathan & I. Güvenc
TL;DR:
The six papers in this special issue focus on signal processing in heterogeneous networks for future broadband wireless systems and how these systems will change over time.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 book
Multicell handoff in MIMO cellular systems
In Advances in Intelligent and Soft Computing (pp. 893–898).
Contributors: S. Cho *, J. Choi* & R. Heath Jr.
TL;DR:
The simulation results demonstrate that the multicell handoff provides an improvement of average throughput in the high spatial correlation case.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Multi-cell coordination: A stochastic geometry approach
IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 16–20.
Contributors: S. Akoum* & R. Heath Jr.
TL;DR:
Numerical results show that the average achievable rate with interference coordination as well as the mean loss in rate with equal-bit partitioning increase with increasing average cluster size and increasing number of antennas at the transmitter.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Modeling heterogeneous network interference
2012 Information Theory and Applications Workshop, ITA 2012 - Conference Proceedings, 17–22.
Contributors: R. Heath Jr. & M. Kountouris *
TL;DR:
The proposed model simplifies the simulation of cellular systems and may provide analytical insights for certain signaling strategies and the proposed model is based on a simplified interference model for heterogeneous network.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Interference-free relay transmission without CSI-S for the MIMO two-hop interference channel
2012 19th International Conference on Systems, Signals and Image Processing, IWSSIP 2012, 217–221. http://www.scopus.com/inward/record.url?eid=2-s2.0-84863895761&partnerID=MN8TOARS
Contributors: N. Lee & R. Heath Jr.
Source: ORCID
Added: September 11, 2020
2012 conference paper
Not too delayed CSIT achieves the optimal degrees of freedom
2012 50th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2012, 1262–1269.
TL;DR:
A new transmission method called space-time interference alignment is proposed, which actively exploits both the current and past CSI, and shows that it is possible to achieve the optimal degrees of freedom (DoF) gain if the delay is less than a certain fraction of the channel coherence time.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Multiuser MIMO in distributed antenna systems with limited feedback
2012 IEEE Globecom Workshops, GC Wkshps 2012, 546–551.
Contributors: S. Schwarz, R. Heath* & M. Rupp
TL;DR:
This work demonstrates the viability of zero forcing multiuser MIMO DASs with perfect channel state information (CSI) at the transmitter (CSIT) in an LTE simulation framework and modify previously derived feedback algorithms to exploit the large scale fading differences inherently existing in Dass.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Low complexity precoding for large millimeter wave MIMO systems
IEEE International Conference on Communications, 3724–3729.
Contributors: O. Ayach*, R. Heath* , S. Abu-Surra*, S. Rajagopal* & Z. Pi*
TL;DR:
A precoding algorithm is developed that approximates the optimal unconstrained precoder using a low dimensional basis representation that can be efficiently implemented in RF hardware and allows mmWave systems to approach waterfilling capacity.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2012 journal article
Interference aware-coordinated beamforming in a multi-cell system
IEEE Transactions on Wireless Communications, 11(10), 3692–3703.
Contributors: C. Chae *, I. Hwang *, R. Heath Jr. & V. Tarokh *
author keywords: MIMO system; multiuser system; multi-cell system; interference alignment; interference suppression; coordinated beamforming
TL;DR:
Numerical results confirm that the proposed system with two transmit/receive antennas achieves the full degrees of freedom of the two-cell multiple-input multiple-output channel while showing a better sum rate performance than competitive solutions such as non-cooperative eigen-beamforming and interference nulling.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 journal article
Interference alignment with analog channel state feedback
IEEE Transactions on Wireless Communications, 11(2), 626–636.
Contributors: O. Ayach* & R. Heath Jr.
author keywords: Interference alignment; interference channel; multiple antennas; MIMO; analog feedback; limited feedback
TL;DR:
It is shown that the full multiplexing gain observed with perfect channel knowledge is preserved by analog feedback and that the mean loss in sum rate is bounded by a constant when signal-to-noise ratio is comparable in both forward and feedback channels.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 journal article
A cross-layer design for perceptual optimization of H.264/SVC with unequal error protection
IEEE Journal on Selected Areas in Communications, 30(7), 1157–1171.
Contributors: A. Khalek*, C. Caramanis* & R. Heath Jr.
author keywords: Scalable video coding (SVC); unequal error protection (UEP); cross-layer design; link adaptation; QoS-to-QoE mapping
TL;DR:
This work introduces an APP/MAC/PHY cross-layer architecture that enables optimizing perceptual quality for delay-constrained scalable video transmission and proposes an online QoS-to-QoE mapping technique to quantify the loss visibility of packets from each video layer according to packet loss visibility.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Interference leakage minimization for convolutive MIMO interference channels
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 2829–2832.
Contributors: Ó. González *, C. Lameiro *, J. Vía*, I. Santamaria * & R. Heath Jr.
TL;DR:
It is shown in the paper that each step of the alternating minimization algorithm can be reformulated as a convex optimization problem in which the autocorrelation function of the precoders or decoders is obtained.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Data sharing coordination and blind interference alignment for cellular networks
GLOBECOM - IEEE Global Telecommunications Conference, 4273–4277.
Contributors: S. Akoum*, C. Chen, M. Debbah * & R. Heath*
TL;DR:
A new cooperative BIA scheme is proposed that takes into account the users whose data is being shared between adjacent base stations, and derives the achievable sum rate with interference mitigation and compares it to achievable rates with the original BIA strategy.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Coverage and capacity in mmWave cellular systems
Conference Record - Asilomar Conference on Signals, Systems and Computers, 688–692.
Contributors: S. Akoum*, O. El Ayach* & R. Heath*
TL;DR:
It is shown that coverage in mmWave systems can rival or even exceed coverage in microwave systems assuming that the link budgets promised by existing mmWave system designs are in fact achieved and this comparable coverage translates into a superior average rate performance for mmWave Systems as a result of the larger bandwidth available for transmission.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Interference alignment with limited feedback for two-cell interfering MIMO-MAC
Proceedings of the International Symposium on Wireless Communication Systems, 566–570.
Contributors: N. Lee *, W. Shin *, R. Heath Jr. & B. Clerckx *
TL;DR:
It is shown that in order to keep the same multiplexing gain with the case of perfect CSIT, the number of feedback bits per receiver should be increased linearly with the SNR in dB scale.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 conference paper
Implementation of a real-time wireless interference alignment network
Conference Record - Asilomar Conference on Signals, Systems and Computers, 104–108.
Contributors: J. Massey *, J. Starr*, S. Lee*, D. Lee *, A. Gerstlauer * & R. Heath*
TL;DR:
Two testbeds that implement real-time Multiple-input multiple-output (MIMO) IA for a network with three 2-antenna user pairs using software defined radio techniques are described: a PC-based testbed for rapid prototyping of potential IA protocols and an embedded test bed for evaluating IA under real-world computational constraints.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2012 journal article
Grassmannian differential limited feedback for interference alignment
IEEE Transactions on Signal Processing, 60(12), 6481–6494.
Contributors: O. El Ayach* & R. Heath*
author keywords: Channel state information (CSI); differential feedback; Grassmann manifold; interference alignment; interference cancellation; interference channels; limited feedback; multiple access interference; OFDM
TL;DR:
The main conclusions are that the proposed Grassmannian differential feedback strategy allows IA to perform well over a wide range of Doppler spreads, and to approach perfect CSI performance in slowly varying channels.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
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