Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
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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
Performance Analysis of NOMA in Training-Based Multiuser MIMO Systems
TL;DR: In this article, the authors considered the use of non-orthogonal-multiple access (NOMA) in multiuser MIMO systems in practical scenarios where channel state information (CSI) is acquired through pilot signaling.
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Pilot Optimization and Channel Estimation for Multiuser Massive MIMO Systems
TL;DR: In this article, the authors proposed a pilot optimization and channel estimation algorithm for the downlink multiuser massive multiple input multiple output (MIMO) system with decentralized single antenna mobile stations (MSs), and time division duplex (TDD) channel estimation which is performed by utilizing $N$ pilot symbols.
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Optimal Design of Energy-Efficient Multi-User MIMO Systems: Is Massive MIMO the Answer?
TL;DR: In this paper, the optimal number of antennas, active users, and transmit power of a multiuser MIMO system with different processing schemes at the base station were investigated.
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Linear Massive MIMO Precoders in the Presence of Phase Noise -- A Large-Scale Analysis
Rajet Krishnan,Mohammad Reza Khanzadi,Narayanan Krishnan,Yibo Wu,A. Graell i Amat,Thomas Eriksson,Robert Schober +6 more
TL;DR: The impact of phase noise on the signal-to-interference-plus-noise ratio (SINR) can be quantified as an effective reduction in the quality of the channel state information (CSI) available at the BS when compared with a system without phase noise.
Journal ArticleDOI
Spectral and Energy Efficiency of Multi-Pair Massive MIMO Relay Network With Hybrid Processing
TL;DR: In this paper, the authors considered a multi-pair massive MIMO relay network, where the relay is equipped with a large number of antennas, but driven by a far smaller number of radio-frequency (RF) chains.
References
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