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
Uplink Performance of Wideband Massive MIMO With One-Bit ADCs
TL;DR: An analysis of the spectral efficiency of single-carrier and orthogonal-frequency-division-multiplexing (OFDM) transmission in massive MIMO systems that use one-bit ADCs is presented and it is concluded that wideband massive M IMO systems work well with one- bit ADCs.
Patent
Method and apparatus for coupling an antenna to a device
Paul Shala Henry,Donald J. Barnickel,Farhad Barzegar,Robert Bennett,Irwin Gerszberg,Thomas M. Willis +5 more
TL;DR: In this paper, the authors describe a system that receives, by a feed point of a dielectric antenna, electromagnetic waves from a core coupled to the feed point without an electrical return path, and radiates a wireless signal responsive to the electromagnetic waves being received at the aperture.
Journal ArticleDOI
Cell-Free Massive MIMO: A New Next-Generation Paradigm
TL;DR: This paper quantifies the advantages of CF massive MIMO systems in terms of their energy- and cost-efficiency and the signal processing techniques invoked for reducing the fronthaul burden for joint channel estimation and for transmit precoding.
Proceedings ArticleDOI
Channel measurements and analysis for very large array systems at 2.6 GHz
Sohail Payami,Fredrik Tufvesson +1 more
TL;DR: This paper investigates channel properties for a realistic, though somewhat extreme, outdoor base station scenario using a large array, and shows that the statistical properties of the received signal vary significantly over the large array.
Journal ArticleDOI
A Survey on Resource Allocation for 5G Heterogeneous Networks: Current Research, Future Trends, and Challenges
TL;DR: A comprehensive survey on RA in HetNets for 5G communications is provided and two potential structures for 6G communications are provided, such as a learning-based RA structure and a control- based RA structure.
References
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Journal ArticleDOI
Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
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