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
Ultrareliable and Low-Latency Communication Techniques for Tactile Internet Services
Kwang Soon Kim,Dong Ku Kim,Chan-Byoung Chae,Sunghyun Choi,Young-Chai Ko,Jonghyun Kim,Yeon-Geun Lim,Minho Yang,Sundo Kim,Byungju Lim,Kwanghoon Lee,Kyung Lin Ryu +11 more
TL;DR: In this paper, some novel physical layer technologies such as waveform multiplexing, multiple-access scheme, channel code design, synchronization, and full-duplex transmission for spectrally efficient URLLC are introduced and a novel performance evaluation approach is suggested for evaluating the performance of the proposed schemes.
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Optimal Power Control and Load Balancing for Uplink Cell-Free Multi-User Massive MIMO
TL;DR: This paper proposes an iterative elimination (IE) algorithm to remove ineffective BSs for each user in the cell-free (CF) multi-user (MU) massive multiple-input multiple-output system and shows that it is better than both maximum signal-to-noise ratio association and full-set joint transmission, especially in the high QoS regime.
Journal ArticleDOI
Foundations of User-Centric Cell-Free Massive MIMO
TL;DR: In this article, the fundamental tradeoffs between communication performance, computational complexity, and fronthaul signaling requirements are thoroughly analyzed, while open problems related to these and other resource allocation problems are reviewed.
Journal ArticleDOI
On Massive MIMO Zero-Forcing Transceiver Using Time-Shifted Pilots
TL;DR: This paper analyzes the performance of massive MIMO zero-forcing systems using the time-shifted pilot scheme, and compares the performances of conjugate and ZF precoders, from which a simple but effective large-scale fading-based UT scheduling scheme is proposed to enhance the system throughput.
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State-of-the-Art Design of Index Modulation in the Space, Time, and Frequency Domains: Benefits and Fundamental Limitations
TL;DR: This paper characterize operational scenarios and system settings that specifically benefit from IM schemes versus their non-IM counterparts while clarifying the fundamental limitations and the open issues for IM schemes that have not been sufficiently explored previously.
References
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Journal ArticleDOI
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.
Journal ArticleDOI
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.