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
Efficient Angle-Domain Processing for FDD-Based Cell-Free Massive MIMO Systems
TL;DR: In this paper, the authors proposed a low complexity multipath component estimation technique and presented linear angle-of-arrival (AoA)-based beamforming/combining schemes for FDD-based cell-free massive MIMO systems.
Journal ArticleDOI
Reduced Switching Connectivity for Large Scale Antenna Selection
TL;DR: The analytical and simulation results shown in this paper demonstrate that partially-connected switching maximizes the energy efficiency of massive MIMO systems for a reduced number of RF chains, while fully-flexible switching offers sub-optimal energy efficiency benefits due to its significant switching power losses.
Posted Content
Massive MIMO Systems: Signal Processing Challenges and Research Trends
TL;DR: The operational requirements ofmassive MIMO systems are discussed along with their operation in time-division duplexing mode, resource allocation and calibration requirements, and transmit and receiver processing algorithms are examined in light of the specific needs of massive MIMo systems.
Journal ArticleDOI
Channel Estimation for Full-Duplex Relay Systems With Large-Scale Antenna Arrays
TL;DR: This paper addresses two channel estimation problems for large-scale multiple-input multiple-output system with full-duplex relay, where both the base station and the relay estimate their respective channels, and cascaded estimation, where only the BS estimates the cascaded two-hop channel.
Posted Content
User-Centric 5G Cellular Networks: Resource Allocation and Comparison with the Cell-Free Massive MIMO Approach
TL;DR: In this article, the authors proposed a beamfoming scheme that, relying on the channel hardening effect, does not require channel estimation at the MSs and compared the CF massive MIMO approach with a user-centric approach, where each MS is served only by a limited number of APs.
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.