Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
TLDR
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.Abstract:
A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval. Time-division duplex operation combined with reverse-link pilots enables the base station to estimate the reciprocal forward- and reverse-link channels. The conjugate-transpose of the channel estimates are used as a linear precoder and combiner respectively on the forward and reverse links. Propagation, unknown to both terminals and base station, comprises fast fading, log-normal shadow fading, and geometric attenuation. In the limit of an infinite number of antennas a complete multi-cellular analysis, which accounts for inter-cellular interference and the overhead and errors associated with channel-state information, yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve. In particular the effects of uncorrelated noise and fast fading vanish, throughput and the number of terminals are independent of the size of the cells, spectral efficiency is independent of bandwidth, and the required transmitted energy per bit vanishes. The only remaining impairment is inter-cellular interference caused by re-use of the pilot sequences in other cells (pilot contamination) which does not vanish with unlimited number of antennas.read more
Citations
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Journal ArticleDOI
Massive Access for 5G and Beyond
TL;DR: In this article, a comprehensive survey of massive access design for B5G wireless networks is presented, from the perspectives of theory, protocols, techniques, coverage, energy, and security.
Proceedings ArticleDOI
Compressive sensing based channel feedback protocols for spatially-correlated massive antenna arrays
TL;DR: This paper proposes channel feedback reduction techniques based on the theory of compressive sensing, which permits the transmitter to obtain channel information with acceptable accuracy under substantially reduced feedback load.
Journal ArticleDOI
Beyond Massive MIMO: The Potential of Positioning With Large Intelligent Surfaces
Sha Hu,Fredrik Rusek,Ove Edfors +2 more
TL;DR: The impact of centralized and distributed deployments of LIS is extensively discussed, and it is shown that a distributed deployment of L IS can enlarge the coverage and improve the overall positioning performance.
Journal ArticleDOI
Hybrid Block Diagonalization for Massive Multiuser MIMO Systems
Weiheng Ni,Xiaodai Dong +1 more
TL;DR: This paper considers the downlink communication of a massive multiuser MIMO (MU-MIMO) system and proposes a low-complexity hybrid block diagonalization (Hy-BD) scheme to approach the capacity performance of the traditional BD processing method.
Journal ArticleDOI
Network MIMO With Linear Zero-Forcing Beamforming: Large System Analysis, Impact of Channel Estimation, and Reduced-Complexity Scheduling
TL;DR: A new simplified downlink scheduling scheme that preselects the users according to probabilities obtained from the large-system results, depending on the desired fairness criterion is proposed, performing close to the optimal (finite-dimensional) opportunistic user selection while requiring significantly less channel state feedback, since only a small fraction of preselected users must feed back their channel state information.
References
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