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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Book ChapterDOI
Massive MIMO Communications
Trinh Van Chien,Emil Björnson +1 more
TL;DR: The Massive MIMO technology can bring at least ten-fold improvements in area data throughput, to manage the growing wireless data traffic.
Journal ArticleDOI
Interference-Driven Antenna Selection for Massive Multiuser MIMO
TL;DR: The results presented in this paper prove that AS and green radio concepts can be jointly used for power-efficient M-MIMO, as they lead to significant power savings and complexity reductions.
Proceedings ArticleDOI
An energy efficient antenna selection for large scale green MIMO systems
TL;DR: It is shown that with LS-MIMO, simple random antenna selection can provide significant EE gain, and if the EE optimum number of antenna is larger than a certain threshold, the Random antenna selection is already very close to the optimum antenna selection.
Proceedings ArticleDOI
Spatial orthogonality-based pilot reuse for multi-cell massive MIMO transmission
Li Mingmei,Shi Jin,Xiqi Gao +2 more
TL;DR: The simulation results indicate that, in the large-number-of-antennas, the pilot contamination effect can be vanished completely under the spatial orthogonality condition presented, and pilot reuse among inter-cell UTs will not incur any rate loss.
Journal ArticleDOI
Machine Learning Methods for RSS-Based User Positioning in Distributed Massive MIMO
TL;DR: This work considers two GP methods for localization, namely, the conventional GP (CGP) and the numerical approximation GP (NaGP), and derives the true predictive distribution and employs NaGP to obtain realistic error-bars on the location estimates.
References
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Journal ArticleDOI
Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
TL;DR: It is shown that the dirty paper achievable region achieves the sum-rate capacity of the MIMO BC by establishing that the maximum sum rate of this region equals an upper bound on the sum rate.