Works Published in 2009
Displaying works 61 - 80 of 323 in total
Sorted by most recent date added to the index first, which may not be the same as publication date order.
2009 conference paper
Interference alignment via alternating minimization
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 2445–2448.
Contributors: S. Peters* & R. Heath Jr.
author keywords: MIMO systems; Interference; Radio communication; Multiuser channels; Optimization methods
TL;DR:
The algorithm is an alternating minimization over the precoding matrices at the transmitters and the interference subspaces at the receivers, and is proven to converge.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2009 conference paper
An online learning framework for link adaptation in wireless networks
Information Theory and Applications Workshop, ITA 2009, 138–140.
Contributors: R. Daniels* & R. Heath Jr.
TL;DR:
This paper summarizes an online machine learning approach to parameter selection through the real-time capturing of performance related data and a modified version of k-nearest neighbor is developed to enable both thereal-time capture of training data and the performance criterion for physical layer adaptation.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2009 journal article
Frequency-domain channel estimation and equalization for continuous-phase modulations with superimposed pilot sequences
IEEE Transactions on Vehicular Technology, 58(9), 4903–4908.
Contributors: C. Park *, R. Heathjr. Jr. & T. Rappaport *
author keywords: Block transmission; continuous-phase modulation (CPM); frequency-domain channel estimation and equalization; superimposed pilot-assisted transmission
TL;DR:
This paper proposes a new frequency-domain channel-estimation and equalization method for continuous-phase modulation block transmissions with superimposed pilot signals that provides spectral and power-efficient broadband CPM wireless communications with less complexity than previous methods.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2009 conference paper
Block diagonalization in the MIMO broadcast channel with delayed CSIT
GLOBECOM - IEEE Global Telecommunications Conference.
Contributors: J. Zhang *, J. Andrews * & R. Heath Jr.
TL;DR:
An upper bound for the achievable throughput is provided, which shows that BD is more robust to imperfect CSIT than zeroforcing precoding as it has fewer inter-user interfering streams.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2009 conference paper
An experimental evaluation of rate adaptation for multi-antenna systems
Proceedings - IEEE INFOCOM, 2313–2321.
Contributors: W. Kim *, O. Khan *, K. Truong *, S. Choi *, R. Grant*, H. Wright*, K. Mandke*, R. Daniels*, R. Heath Jr., S. Nettles*
TL;DR:
This work presents the first experimental study of adaptation between single and multiple spatial streams for 802.11n style systems and studies rate adaptation algorithms using both explicit and implicit feedback from the receiver.
(via Semantic Scholar)
citeseerx.ist.psu.edu (repository)
Source: ORCID
Added: September 11, 2020
2009 conference paper
Grassmannian predictive coding for delayed limited feedback MIMO systems
2009 47th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2009, 783–788.
Contributors: T. Inoue * & R. Heath Jr.
author keywords: Prediction methods; correlation; feedback communication; MIMO systems; quantization; vector quantization
TL;DR:
A Grassmannian prediction and predictive coding framework for delayed feedback systems by exploiting the memory in the channel and a prediction step size optimization criterion for correlated time-series evolving on the Grassmann manifold is derived.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2009 journal article
Adaptive mode switching in correlated multiple antenna cellular networks
Journal of Communications and Networks, 11(3), 279–286. http://www.scopus.com/inward/record.url?eid=2-s2.0-68149092614&partnerID=MN8TOARS
Contributors: C. Lee, C. Chae, S. Vishwanath & R. Heath Jr.
Source: ORCID
Added: September 11, 2020
2009 journal article
A cross-layer approach to energy efficiency for adaptive MIMO systems exploiting spare capacity
IEEE Transactions on Wireless Communications, 8(8), 4264–4275.
Contributors: H. Kim, C. Chae *, G. De Veciana & R. Heath Jr.
author keywords: MIMO; energy conservation; spare capacity; adaptive switching; cross-layer design
TL;DR:
This paper proposes an adaptive mode switching algorithm combined with rate selection to maintain a user's target throughput while achieving energy efficiency and shows that there exists a crossover point on the transmission rate below which SIMO consumes less power than MIMO when circuit power is included.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2009 conference paper
Achievable throughput of multi-mode multiuser MIMO with imperfect CSI constraints
IEEE International Symposium on Information Theory - Proceedings, 2659–2663.
Contributors: J. Zhang *, M. Kountouris *, J. Andrews * & R. Heath Jr.
TL;DR:
It is shown that not all possible users should be supported with spatial division multiplexing due to the residual inter-user interference caused by imperfect CSIT, and a multi-mode transmission strategy is proposed to maximize the throughput.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2009 journal article
Reconfigurable logic blocks based on a chaotic Chua circuit
Chaos, Solitons & Fractals, 41(1), 233–244.
TL;DR:
A method is formed that demonstrates that the chaotic saddles of the inherent chaotic dynamics can be exploited to enhance the robustness of the logic functions with respect to noise.
(via Semantic Scholar)
Source: Crossref
Added: August 28, 2020
2009 journal article
Spin transfer torque switching of magnetic tunnel junctions using a conductive atomic force microscope
Applied Physics Letters, 95(13), 132510.
Source: Crossref
Added: August 28, 2020
2009 journal article
On carrier spillover in c- and m-plane InGaN light emitting diodes
Applied Physics Letters, 95(20), 201113.
author keywords: charge injection; current density; gallium compounds; III-V semiconductors; indium compounds; light emitting diodes; photoluminescence
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: Crossref
Added: August 28, 2020
2009 journal article
Efficiency retention at high current injection levels in m-plane InGaN light emitting diodes
Applied Physics Letters, 95(12), 121107.
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: Crossref
Added: August 28, 2020
2009 journal article
Internal quantum efficiency of c-plane InGaN and m-plane InGaN on Si and GaN
Applied Physics Letters, 95(10), 101106.
Source: Crossref
Added: August 28, 2020
2009 journal article
Optical characterization of bulk GaN substrates with c -, a -, and m -plane surfaces
Physica Status Solidi (c), 6(S2), S763–S766.
Source: Crossref
Added: August 28, 2020
2009 journal article
Polar and nonpolar HVPE GaN substrates: impact of doping on the structural, electrical and optical characteristics
Physica Status Solidi (c), 6(S2), S344–S347.
Source: Crossref
Added: August 28, 2020
2009 journal article
Modulation of mobility in homoepitaxially-grown AlGaN/GaN heterostructures
Physica Status Solidi (c), 6(S2), S1037–S1040.
Source: Crossref
Added: August 28, 2020
2009 journal article
Cathodoluminescence evaluation of subsurface damage in GaN substrate after polishing
Physica Status Solidi (c), 6(S2), S325–S328.
Source: Crossref
Added: August 28, 2020
2009 journal article
Structural perfection of InGaN layers and its relation to photoluminescence
Physica Status Solidi (c), 6(12), 2626–2631.
Source: Crossref
Added: August 28, 2020
2009 journal article
Spontaneous stratification of InGaN layers and its influence on optical properties
Physica Status Solidi (c), 6(S2), S433–S436.
Source: Crossref
Added: August 28, 2020
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