Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
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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
Evolution towards fifth generation (5G) wireless networks: Current trends and challenges in the deployment of millimetre wave, massive MIMO, and small cells
TL;DR: The most promising lines of research from the recent literature in common directions for the 5G project are highlighted, which include spatial multiplexing using massive multi-user multiple-input multiple-output (MIMO) techniques with millimetre-waves (mm-waves) in small cell geometries.
Posted Content
A Survey of Downlink Non-orthogonal Multiple Access for 5G Wireless Communication Networks
TL;DR: A simple NOMA model with two users served by a single-carrier simultaneously to illustrate its basic principles is discussed and a more general model with multicarrier serving an arbitrary number of users on each subcarrier is discussed.
Book ChapterDOI
Large MIMO Systems
TL;DR: There is in-depth coverage of algorithms for large MIMO signal processing, based on meta-heuristics, belief propagation and Monte Carlo sampling techniques, and suited for large-scale signal detection, precoding and LDPC code designs.
Journal ArticleDOI
The World’s First Real-Time Testbed for Massive MIMO: Design, Implementation, and Validation
Steffen Malkowsky,Joao Vieira,Liang Liu,Paul Harris,Karl F. Nieman,Nikhil Kundargi,I.C. Wong,Fredrik Tufvesson,Viktor Öwall,Ove Edfors +9 more
TL;DR: In this paper, a framework for designing a massive multiple-input multiple-output (MIMO) testbed by investigating hardware (HW) and system-level requirements, such as processing complexity, duplexing mode, and frame structure, is proposed.
Journal ArticleDOI
Massive MIMO in Sub-6 GHz and mmWave: Physical, Practical, and Use-Case Differences
TL;DR: In this article, the authors suggest appropriate signal processing schemes and use cases to efficiently exploit mMIMO in both frequency bands, namely 30-300 GHz and millimeter wave (mmWave).
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.