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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Proceedings ArticleDOI
Leveraging UAVs with Intelligent Reflecting Surfaces for Energy-Efficient Communications with Cell-Edge Users
Zina Mohamed,Sonia Aissa +1 more
TL;DR: This paper investigates the advantages of using intelligent reflecting surfaces (IRS) at the UAV to achieve the end-to-end communication with high energy efficiency, and proposes an iterative algorithm based on maximum-ratio transmission, alternating optimization techniques and difference of convex (DC) programming.
Proceedings ArticleDOI
CSI overhead reduction with stochastic beamforming for cloud radio access networks
TL;DR: Simulation results show that the proposed CSI acquisition scheme with stochastic beamforming can significantly reduce the CSI overhead while providing performance close to that with full CSI.
Journal ArticleDOI
Adaptive Pilot Clustering in Heterogeneous Massive MIMO Networks
TL;DR: This work develops a low-complexity distributed coalition formation based on individual stability and incorporates a BS intercommunication budget constraint to control the overhead in message exchange between the BSs and ensure the algorithm's convergence to a solution of the game called individually stable coalition structure.
Journal ArticleDOI
Joint Spatiotemporal Multipath Mitigation in Large-Scale Array Localization
Yunlong Wang,Ying Wu,Yuan Shen +2 more
TL;DR: It is proved the asymptotic spatial orthogonality of large-scale multiple-input multiple-output (MIMO) localization with general non-orthogonal waveforms, showing that the multipath effects will vanish when the number of transmitter or receiver antennas goes large.
Posted Content
Elevation Beamforming with Full Dimension MIMO Architectures in 5G Systems: A Tutorial
TL;DR: In this article, a tutorial on elevation beamforming analysis for cellular networks utilizing FD Massive MIMO antenna arrays is presented, which is distinguished by its depth with respect to the theoretical aspects of antenna array and 3D channel modeling.
References
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Journal ArticleDOI
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