Works Published in 2014
Displaying works 61 - 80 of 415 in total
Sorted by most recent date added to the index first, which may not be the same as publication date order.
2014 conference paper
Joint transmission mode and tilt adaptation in coordinated small-cell networks
2014 IEEE International Conference on Communications Workshops, ICC 2014, 598–603.
Contributors: N. Seifi*, R. Heath* , M. Coldrey * & T. Svensson *
TL;DR:
A novel hybrid-mode transmission technique is proposed that can achieve a performance comparable to that of a fully coordinated transmission but with a significantly lower complexity and signaling requirement.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Secure communication in cellular networks: The benefits of millimeter wave mobile broadband
IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2014-October(October), 115–119.
Contributors: L. Wang *, M. Elkashlan *, T. Duong * & R. Heath*
TL;DR:
Numerical results corroborate the analysis and show that mmWave systems can enable significant secrecy improvement and be indicated that with large antenna arrays, multi-gigabit per second secure link at the mmWave frequencies can be reached in the delay-tolerant transmission mode and the adverse effect of secrecy outage vanishes in thedelay-limited transmission mode.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
MIMO for millimeter-wave wireless communications: Beamforming, spatial multiplexing, or both?
IEEE Communications Magazine, 52(12), 110–121.
Contributors: S. Sun *, T. Rappaport *, R. Heath* , A. Nix* & S. Rangan *
TL;DR:
This tutorial explores the fundamental issues involved in selecting the best communications approaches for mmWave frequencies, and provides insights, challenges, and appropriate uses of each MIMO technique based on early knowledge of the mmWave propagation environment.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
Learning-based adaptive transmission for limited feedback multiuser MIMO-OFDM
IEEE Transactions on Wireless Communications, 13(7), 3806–3820.
Contributors: A. Rico-Alvariño* & R. Heath Jr.
author keywords: IEEE 802.11ac; link adaptation; machine learning; multiuser multiple input multiple output (MIMO)-orthogonal frequency division multiplexing (OFDM)
TL;DR:
This paper presents a data-driven approach to link adaptation for multiuser multiple input mulitple output (MIMO) OFDM systems, and a new approximation is developed to estimate the unknown interuser interference due to the use of limited feedback.
(via Semantic Scholar)
arxiv.org (repository)
Source: ORCID
Added: September 11, 2020
2014 journal article
MIMO precoding and combining solutions for millimeter-wave systems
IEEE Communications Magazine, 52(12), 122–131.
Contributors: A. Alkhateeb *, J. Mo *, N. González-Prelcic * & R. Heath Jr
TL;DR:
How beamforming and precoding are different in MIMO mmWave systems than in their lower-frequency counterparts, due to different hardware constraints and channel characteristics are explained.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Cross-polarization RF precoding to mitigate mobile misorientation and polarization leakage
2014 IEEE 11th Consumer Communications and Networking Conference, CCNC 2014, 581–586.
Contributors: A. Khalek*, R. Heath Jr., S. Rajagopal*, S. Abu-Surra* & J. Zhang
TL;DR:
A beamforming algorithm is proposed that jointly designs the horizontal and vertical beamformers and combiners to maximize spectral efficiency in the presence of mobile misorientation and polarization leakage and derives the maximum likelihood estimate of the azimuth and elevation mobile rotation.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Coordinated beamforming with dynamic clustering: A stochastic geometry approach
2014 IEEE International Conference on Communications, ICC 2014, 2165–2170.
Contributors: N. Lee *, R. Heath Jr., D. Morales-Jimenez * & A. Lozano *
TL;DR:
This paper characterizes the performance of coordinated beamforming with dynamic clustering and forms the computation of the number of coordinated BSs that maximizes the spectral efficiency for a given fading coherence, making precise the intuition that the slower the fading, the more beneficial the coordination.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Impact of 3D base station antenna in random heterogeneous cellular networks
IEEE Wireless Communications and Networking Conference, WCNC, 2254–2259.
TL;DR:
It is found that narrowing the vertical beamwidth of the pico cell must be accompanied by downtilt to result in improved coverage and capacity, and high building density leads to improved network performance, motivating the deployment of heterogeneous networks in dense urban areas.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2014 conference paper
High SNR capacity of millimeter wave MIMO systems with one-bit quantization
2014 Information Theory and Applications Workshop, ITA 2014 - Conference Proceedings.
TL;DR:
Bounds on the high signal-to-noise ratio (SNR) capacity are derived for the single-input multiple-output (SIMO) channel and the general MIMO channel with very low resolution one-bit ADCs.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Centimeter positioning with a smartphone-Quality GNSS antenna
27th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2014, 2, 1568–1577. http://www.scopus.com/inward/record.url?eid=2-s2.0-84939449408&partnerID=MN8TOARS
Contributors: K. Pesyna, R. Heath & T. Humphreys
Source: ORCID
Added: September 11, 2020
2014 journal article
Five disruptive technology directions for 5G
IEEE Communications Magazine, 52(2), 74–80.
Contributors: F. Boccardi*, R. Heath Jr., A. Lozano *, T. Marzetta * & P. Popovski *
TL;DR:
Five technologies that could lead to both architectural and component disruptive design changes: device-centric architectures, millimeter wave, massive MIMO, smarter devices, and native support for machine-to-machine communications are described.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
FER prediction with variable codeword length
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 1931–1935.
Contributors: A. Rico-Alvarino*, R. Heath* & C. Mosquera *
TL;DR:
This paper derives a low complexity FER estimator for frames of different length transmitted over a binary symmetric channel of unknown error probability and extends this technique to coded systems by the use of effective SNR FER predictors.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
Coverage and capacity of millimeter-wave cellular networks
IEEE Communications Magazine, 52(9), 70–77.
Contributors: T. Bai*, A. Alkhateeb * & R. Heath*
TL;DR:
Dense mmWave networks can achieve both higher data rates and comparable coverage relative to conventional microwave networks, andSum rate gains can be achieved using more advanced beamforming techniques that allow multiuser transmission.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
Channel estimation and hybrid precoding for millimeter wave cellular systems
IEEE Journal on Selected Topics in Signal Processing, 8(5), 831–846.
Contributors: A. Alkhateeb *, O. El Ayach*, G. Leus * & R. Heath*
author keywords: Millimeter wave cellular systems; sparse channel estimation; adaptive compressed sensing; hybrid precoding
TL;DR:
An adaptive algorithm to estimate the mmWave channel parameters that exploits the poor scattering nature of the channel is developed and a new hybrid analog/digital precoding algorithm is proposed that overcomes the hardware constraints on the analog-only beamforming, and approaches the performance of digital solutions.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
Coordinated 3D beamforming for interference management in cellular networks
IEEE Transactions on Wireless Communications, 13(10), 5396–5410.
Contributors: N. Seifi*, J. Zhang *, R. Heath* , T. Svensson * & M. Coldrey *
author keywords: Antenna tilt; base station coordination; channel state information (CSI) delay; interference management; 3D beamforming
TL;DR:
A novel transmission technique in which intercell interference management is performed via coordinating the beamforming jointly in the horizontal and vertical planes of the wireless channel, denoted as coordinated 3D beamforming is proposed.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Asymptotic coverage and rate in massive MIMO networks
2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014, 602–606.
Contributors: T. Bai* & R. Heath*
TL;DR:
Numerical results show that, though limited by pilot contamination, massive MIMO is still promising to provide high cell throughput by serving large number of users simultaneously.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Artificial-noise-aided secure multi-antenna transmission in slow fading channels with limited feedback
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 3968–3972.
Contributors: X. Zhang *, X. Zhou *, M. McKay * & R. Heath Jr.
TL;DR:
This system using the artificial-noise-aided beamforming approach to enhance secrecy, considering slow fading channels with outage constraints on the reliability performance of legitimate communication and the secrecy performance against eavesdropping, observes that strengthening the secrecy outage constraint puts higher requirements on the number of feedback bits and the strength of the intended channel.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Analysis of small cell partitioning in urban two-tier heterogeneous cellular networks
2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings, 739–743.
TL;DR:
The results show that isolation by wall partitioning can enhance indoor rate, and that the improvement is more sensitive to building density, rather than penetration loss per building.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2014 conference paper
Adaptive video transmission with subjective quality constraints
2014 IEEE International Conference on Image Processing, ICIP 2014, 2477–2481.
Contributors: C. Chen *, X. Zhu *, G. De Veciana *, A. Bovik * & R. Heath*
TL;DR:
A rate-adaptation algorithm is proposed that can incorporate QoE constraints on the empirical cumulative quality distribution per user and can reduce network resource consumption over conventional average-quality maximized rate- Adaptation algorithms.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2014 journal article
Analysis of blockage effects on urban cellular networks
IEEE Transactions on Wireless Communications, 13(9), 5070–5083.
author keywords: Cellular network; blockage effect; stochastic geometry; random shape theory
TL;DR:
The distribution of the number of blockages in a link is proven to be a Poisson random variable with parameter dependent on the length of the link, and the results show that the base station density should scale superlinearly with the blockage density to maintain the network connectivity.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities
(OpenAlex)
Source: ORCID
Added: September 11, 2020
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