Journal ArticleDOI
Beamforming for small cell deployment in LTE-advanced and beyond
Giulio Bartoli,Romano Fantacci,Khaled Ben Letaief,Dania Marabissi,Niccolo Privitera,Marco Pucci,Jun Zhang +6 more
TLDR
Different small cell deployment approaches are presented: sharing the same frequency bands with the macrocell, or using separated higher frequency bands: for each approach, the benefits of beamforming are discussed.Abstract:
Integrating the standard coverage of traditional macrocells with cells of reduced dimensions (i.e., small cells) is considered one of the main enhancements for Long Term Evolution systems. Small cells will be overlapped with macrocells and possibly also with each other in areas where wider coverage capability and higher throughput are needed. Such heterogeneous network deployment presents many potential benefits but also some challenges that need to be resolved. In particular, multi-antenna techniques and processing in the spatial domain will be key enabling factors to mitigate these issues. This article presents different small cell deployment approaches: sharing the same frequency bands with the macrocell, or using separated higher frequency bands. For each approach, the benefits of beamforming are discussed.read more
Citations
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Journal ArticleDOI
Alternating Minimization Algorithms for Hybrid Precoding in Millimeter Wave MIMO Systems
TL;DR: Treating the hybrid precoder design as a matrix factorization problem, effective alternating minimization (AltMin) algorithms will be proposed for two different hybrid precoding structures, i.e., the fully-connected and partially-connected structures, and simulation comparisons between the two hybrid precode structures will provide valuable design insights.
Journal ArticleDOI
Energy harvesting small cell networks: feasibility, deployment, and operation
TL;DR: A comprehensive study of energy harvesting small cell networks, and investigates important aspects, including a feasibility analysis, network deployment, and network operation issues, together with potential solutions and effective design methodologies.
Journal ArticleDOI
User-Centric Intercell Interference Nulling for Downlink Small Cell Networks
TL;DR: A novel interference coordination strategy, called user-centric intercell interferencenulling, is proposed for small cell networks, and it is shown that the proposed strategy outperforms other interference nulling methods.
Journal ArticleDOI
Success Probability and Area Spectral Efficiency in Multiuser MIMO HetNets
TL;DR: It is shown that as the link reliability requirement increases, more BSs and more tiers should be deactivated, and efficient algorithms to find the optimal BS densities are developed to achieve the maximum ASE while guaranteeing a certain link reliability.
Posted Content
User-Centric Intercell Interference Nulling for Downlink Small Cell Networks
TL;DR: In this article, a user-centric intercell interference coordination strategy is proposed for small cell networks, where each user selects the coordinating BSs based on the relative distance between the home BS and the interfering BSs, and thus interference nulling adapts to each user's own interference situation.
References
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Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
TL;DR: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.
Journal ArticleDOI
Massive MIMO for next generation wireless systems
TL;DR: While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly joined terminals, the exploitation of extra degrees of freedom provided by the excess of service antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios.
Journal ArticleDOI
Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Fredrik Tufvesson +5 more
TL;DR: The gains in multiuser systems are even more impressive, because such systems offer the possibility to transmit simultaneously to several users and the flexibility to select what users to schedule for reception at any given point in time.
Journal ArticleDOI
Energy and Spectral Efficiency of Very Large Multiuser MIMO Systems
TL;DR: In this paper, the tradeoff between the energy efficiency and spectral efficiency of a single-antenna system is quantified for a channel model that includes small-scale fading but not large scale fading, and it is shown that the use of moderately large antenna arrays can improve the spectral and energy efficiency with orders of magnitude compared to a single antenna system.
Journal ArticleDOI
Scaling up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Ove Edfors,Fredrik Tufvesson +6 more
TL;DR: Very large MIMO as mentioned in this paper is a new research field both in communication theory, propagation, and electronics and represents a paradigm shift in the way of thinking both with regards to theory, systems and implementation.