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
Mixed-ADC Massive MIMO Uplink in Frequency-Selective Channels
Ning Liang,Wenyi Zhang +1 more
TL;DR: Investigation of the recently developed mixed-analog-to-digital converter (ADC) architecture for frequency-selective channels reveals that the mixed-ADC architecture with a small proportion of high-resolution ADCs does achieve a dominant portion of the achievable rate of ideal conventional architecture, and that it remarkably improves the performance as compared with one-bit massive multiple-input-multiple-output.
Journal ArticleDOI
Single-Site Localization Based on a New Type of Fingerprint for Massive MIMO-OFDM Systems
TL;DR: A fingerprint-based single-site localization method for massive multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems is proposed and an efficient location estimation method is developed to reduce storage overhead and matching complexity.
Journal ArticleDOI
Energy-Efficient Optimization for Downlink Massive MIMO FDD Systems With Transmit-Side Channel Correlation
TL;DR: The energy-efficient resource allocation problem is investigated for the downlink massive multiple-input-multiple-output (MIMO) frequency-division duplexing (FDD) system under a correlated Rayleigh fading channel and an iterative resource allocation algorithm is proposed.
Journal ArticleDOI
Weighted-Graph-Coloring-Based Pilot Decontamination for Multicell Massive MIMO Systems
TL;DR: Compared with exhaustive search among numerous pilot assignment solutions, the proposed WGC-PD scheme is able to mitigate PC with significantly reduced complexity, which is verified by numerical results.
Proceedings ArticleDOI
Random access protocol for massive MIMO: Strongest-user collision resolution (SUCR)
TL;DR: A reengineered random access protocol, coined strongest-user collision resolution (SUCR), that exploits the channel hardening feature of Massive MIMO channels to enable each user to detect collisions, determine how strong the contenders' channels are, and only keep transmitting if it has the strongest channel gain.
References
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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.