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
Interference Reduction in Multi-Cell Massive MIMO Systems With Large-Scale Fading Precoding
TL;DR: This work devise a new concept of large-scale fading precoding (LSFP) that leads to the effective elimination of inter-cell interference and derives a capacity lower bound for massive MIMO systems with LSFP and a finite number of base station antennas.
Proceedings ArticleDOI
Energy Efficiency of Massive MIMO: Cell-Free vs. Cellular
Hong Yang,Thomas L. Marzetta +1 more
TL;DR: It is demonstrated that in suburban and rural scenarios, cell-free Massive MIMO systems can more than double the radiated energy efficiency and at the same time dramatically increase the 95% likely per user throughput, while in an urban scenario, the gain in radiatedEnergy efficiency can be moderate at less than 50% with a comparable 95%.
Proceedings ArticleDOI
Decontaminating pilots in massive MIMO systems
TL;DR: Analytically it is shown that pilot contamination can be made to vanish asymptotically in the number of antennas for a certain class of channel fading statistics, and how a coordinated user-to-pilot assignment method can be devised to help fulfill this condition in practical networks.
Posted Content
Machine Learning Inspired Energy-Efficient Hybrid Precoding for MmWave Massive MIMO Systems
TL;DR: In this article, the authors proposed an energy-efficient hybrid precoding architecture, where the analog part is realized by a small number of switches and inverters instead of a large number of high-resolution phase shifters.
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.