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
One-Bit Quantization Design and Channel Estimation for Massive MIMO Systems
TL;DR: Simulation results show that the proposed adaptive and random quantization schemes presents a significant performance improvement over the conventional fixed quantization scheme that uses a fixed (typically zero) threshold.
Journal ArticleDOI
Hybrid Beamforming With Selection for Multiuser Massive MIMO Systems
TL;DR: A novel design for the analog beamformer is derived, approaches to reduce the hardware and computational cost of a multiuser HBwS system are explored, and the switch bank architecture, the number of users and the channel estimation overhead impact system performance are studied.
Journal ArticleDOI
Transmit Antenna Selection Schemes for Spatial Modulation Systems: Search Complexity Reduction and Large-Scale MIMO Applications
TL;DR: A novel EDAS-equivalent criterion, relaying on matrix dimension reduction, is proposed to reduce the search complexity, and shows that the proposed D-AS algorithm outperforms conventional TAS schemes conceived for LS-SM-MIMO systems.
Journal ArticleDOI
Data Detection in Large Multi-Antenna Wireless Systems via Approximate Semidefinite Relaxation
TL;DR: Triangular Approximate SEmidefinite Relaxation (TASER) as discussed by the authors relaxes the associated maximum-likelihood (ML) data detection problems into a semidefininite program, which is solved approximately using a preconditioned forward-backward splitting procedure.
Hardware Efficient Approximative Matrix Inversion for Linear Pre-Coding in Massive MIMO
TL;DR: A hardware efficient linear precoder for Massive MIMO Base Stations comprising a very large number of antennas, say, in the order of 100s, serving multiple users simultaneously is described and a method to speed-up the convergence of the Neumann series by using tri-diagonal precondition matrices is proposed, which lowers the complexity even further.
References
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Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas
TL;DR: This paper addresses digital communication in a Rayleigh fading environment when the channel characteristic is unknown at the transmitter but is known (tracked) at the receiver with the aim of leveraging the already highly developed 1-D codec technology.
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On the achievable throughput of a multiantenna Gaussian broadcast channel
Giuseppe Caire,Shlomo Shamai +1 more
TL;DR: Under certain mild conditions, this scheme is found to be throughput-wise asymptotically optimal for both high and low signal-to-noise ratio (SNR), and some numerical results are provided for the ergodic throughput of the simplified zero-forcing scheme in independent Rayleigh fading.
Book
Random Matrix Theory and Wireless Communications
Antonio M. Tulino,Sergio Verdu +1 more
TL;DR: A tutorial on random matrices is provided which provides an overview of the theory and brings together in one source the most significant results recently obtained.
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.