Works Published in 2011
Displaying works 41 - 60 of 334 in total
Sorted by most recent date added to the index first, which may not be the same as publication date order.
2011 conference paper
Spatial interference mitigation for multiple input multiple output ad hoc networks: MISO gains
Conference Record - Asilomar Conference on Signals, Systems and Computers, 708–712.
Contributors: S. Akoum*, M. Kountouris *, M. Debbah * & R. Heath Jr.
TL;DR:
Numerical results show that the network throughput achieve by interference nulling at the transmitter is comparable to that achieved by interference cancellation at the receiver.
(via Semantic Scholar)
hal-supelec.archives-ouvertes.fr (repository)
Source: ORCID
Added: September 11, 2020
2011 journal article
Signal processing for networking and communications
IEEE Signal Processing Magazine, 28(5), 151–152.
Source: ORCID
Added: September 11, 2020
2011 journal article
Overhead reduction in coordinated beamforming for multiuser MIMO-OFDM systems with limited feedforward
IEICE Transactions on Communications, E94-B(11), 3168–3171.
Contributors: L. Soriano-Equigua *, J. Sánchez-Garciá*, C. Chae * & R. Heath Jr.
author keywords: coordinated beamforming; MIMO-OFDM; feedforward overhead; subcarrier correlation
Source: ORCID
Added: September 11, 2020
2011 conference paper
Relay beamforming using interference pricing for the two-hop interference channel
GLOBECOM - IEEE Global Telecommunications Conference.
Contributors: K. Truong * & R. Heath Jr.
Source: ORCID
Added: September 11, 2020
2011 conference paper
Optimizing training and feedback for MIMO interference alignment
Conference Record - Asilomar Conference on Signals, Systems and Computers, 1717–1721.
Contributors: O. El Ayach*, A. Lozano * & R. Heath Jr.
TL;DR:
This paper accurately characterize the effective sum rate with overhead in relation to various parameters such as signal-to-noise ratio and Doppler spread and shows that the overhead of IA can be optimized to ensure good performance in a wide range of fading scenarios.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
Multimode transmission in network MIMO downlink with incomplete CSI
Eurasip Journal on Advances in Signal Processing, 2011.
Contributors: N. Seifi*, M. Viberg *, R. Heath* , J. Zhang * & M. Coldrey *
TL;DR:
Simulation results demonstrate that the developed analytical framework provides a good approximation for a practical number of antennas and it is shown that the proposed scheduling algorithm performs closely to the opportunistic scheduling algorithm that requires instantaneous CSI feedback from all users.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
Multi-mode transmission for the MIMO broadcast channel with imperfect channel state information
IEEE Transactions on Communications, 59(3), 803–814.
Contributors: J. Zhang *, M. Kountouris *, J. Andrews & R. Heath Jr.
author keywords: MIMO systems; space division multiplexing; broadcast channels; feedback; delay effects
TL;DR:
The proposed adaptive multi-mode transmission strategy to improve the spectral efficiency achieved in the multiple-input multiple-output (MIMO) broadcast channel with delayed and quantized channel state information provides performance close to that achieved by opportunistic scheduling with instantaneous feedback from a large number of users.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2011 conference paper
On imperfect CSI for the downlink of a two-tier network
IEEE International Symposium on Information Theory - Proceedings, 553–557.
Contributors: S. Akoum*, M. Kountouris * & R. Heath*
TL;DR:
It is shown that transmit beamforming with imperfect CSI is a viable option for the downlink of a two-tier cellular network, and that rate backoff recovers the loss in rate due to packet outage.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
Multiuser MIMO in distributed antenna systems with out-of-cell interference
IEEE Transactions on Signal Processing, 59(10), 4885–4899.
TL;DR:
Several downlink multiuser multiple input multiple output (MIMO) DAS strategies are proposed and compared in terms of per-user throughput and area spectral efficiency and approximations of the ergodic rate are proposed to facilitate rapid simulation and design space exploration.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2011 journal article
MIMO interference alignment over correlated channels with imperfect CSI
IEEE Transactions on Signal Processing, 59(6), 2783–2794.
Contributors: B. Nosrat-Makouei*, J. Andrews * & R. Heath*
author keywords: Algorithm design and analysis; beamforming; covariance matrix; equalizers; exponential distribution; interference alignment; interference channels; multiple-input multiple-output (MIMO); receivers; signal-to-noise ratio; wireless networks; Wishart distribution
TL;DR:
This paper provides an approximate closed-form signal-to-interference-plus-noise-ratio (SINR) expression for IA over multiple-input-multiple-output (MIMO) channels with imperfect channel state information and transmit antenna correlation and shows that IA may not be optimal for some performance criteria.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Source: ORCID
Added: September 11, 2020
2011 journal article
Noniterative coordinated beamforming for multiuser MIMO systems with limited feedforward
IEEE Signal Processing Letters, 18(12), 701–704.
Contributors: L. Soriano-Equigua *, J. Sánchez-García*, J. Flores-Troncoso * & R. Heath Jr.
author keywords: Coordinated beamforming; feedforward; MU-MIMO; sum rate
TL;DR:
This letter proposes three methods to jointly calculate beamforming and combining vectors for the downlink of TDD multiuser multiple-input multiple-output systems, based on a perfect interference cancellation at the transmitter before calculating the quantized beamformers.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
MIMO transceiver designs for spatial sensing in cognitive radio networks
IEEE Transactions on Wireless Communications, 10(11), 3570–3576.
author keywords: MIMO; cognitive radios; spectrum sharing; projection matrix
TL;DR:
Numerical results confirm that the proposed joint design and the iterative algorithm show better achievable rate performance than the P-SVD technique at the expense, respectively, of CSI knowledge and side information.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 conference paper
MIMO interference alignment in random access networks
Conference Record - Asilomar Conference on Signals, Systems and Computers, 641–645.
Contributors: B. Nosrat-Makouei*, J. Andrews *, R. Heath Jr. & R. Ganti *
TL;DR:
This paper analyzes a multiple-input-multiple-output interference channel where nodes randomly distributed on a plane utilize interference alignment to reduce the point-to-point outage and model the spatial distribution of the nodes as a spatial Poisson cluster point process with equal sized clusters.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 conference paper
Jointly optimized two-cell MIMO systems
2011 IEEE GLOBECOM Workshops, GC Wkshps 2011, 421–425.
Contributors: C. Chae *, I. Hwang *, R. Heath* & V. Tarokh *
TL;DR:
Jointly optimized interference aware coordinated beamforming algorithms for a two-cell system are investigated and it is confirmed that the proposed system shows 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
2011 conference paper
Joint source-channel adaptation for perceptually optimized scalable video transmission
GLOBECOM - IEEE Global Telecommunications Conference.
Contributors: A. Khalek*, C. Caramanis* & R. Heath Jr.
TL;DR:
An algorithm for perceptual quality optimization of scalable H.264 video with temporal and quality scalability is proposed that provides immunity against short term channel fluctuations, balances reliability and perceptual quality, reduces playback buffer starvation probability, and provides a convenient buffer management policy.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
Interference management schemes for the shared relay concept
Eurasip Journal on Advances in Signal Processing, 2011.
Contributors: A. Panah*, K. Truong *, S. Peters* & R. Heath*
TL;DR:
Simulations show that strategies based on two-way shared relaying with bidirectional channel inversion at the relay often perform best in terms of total system throughput while one-way techniques are promising when the relay power is low.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 journal article
Is the PHY layer dead?
IEEE Communications Magazine, 49(4), 159–165.
Contributors: M. Dohler*, R. Heath Jr., A. Lozano *, C. Papadias * & R. Valenzuela
TL;DR:
This article identifies areas that are either under-developed or likely to be of impact in coming years - hence corroborating the relevance and importance of PHY research.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 conference paper
Impact of delayed limited feedback on the sum-rate of intercell interference nulling
IEEE International Conference on Communications.
Contributors: R. Bhagavatula* & R. Heath Jr.
TL;DR:
A feedback-bit allocation strategy is proposed for intercell interference nulling by taking into account the received signal strengths and delays in the feedback and backhaul links.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 conference paper
Grassmannian predictive coding for limited feedback multiuser MIMO systems
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 3076–3079.
Contributors: T. Inoue * & R. Heath Jr.
TL;DR:
This work proposes Grassmannian predictive coding to exploit temporal channel correlation to reduce the feedback requirements in multiuser systems and shows that with practical feedback rates, a significant sum rate improvement can be obtained.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
2011 conference paper
Interference alignment with per-antenna power constraints
IEEE International Symposium on Information Theory - Proceedings, 2746–2750.
Contributors: J. Starr, O. El Ayach & R. Heath*
TL;DR:
This paper proposes and analyzes two algorithms for performing interference alignment with per-antenna equality and inequality power constraints and shows that incorporating equality constraints is more difficult and requires more antennas for interference alignment to be feasible, especially in the case of single-stream systems.
(via Semantic Scholar)
Source: ORCID
Added: September 11, 2020
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