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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Patent
Method and apparatus for authentication and identity management of communicating devices
David Gross,Joshua Lackey,Donald E. Levy,Roger Piqueras Jover,Jayaraman Ramachandran,Cristina Serban +5 more
TL;DR: In this article, a second waveguide system with a non-optical frequency range has been described, where the electromagnetic waves are guided by the transmission medium, and the authentication protocol is based on authentication information contained in the electromagnetic signals.
Journal ArticleDOI
Joint Pilot Design and Uplink Power Allocation in Multi-Cell Massive MIMO Systems
TL;DR: In this paper, instead of modeling the pilot design as a combinatorial assignment problem, as in prior works, instead of expressing the pilot signals using a pilot basis and treating the associated power coefficients as continuous optimization variables, a lower bound on the uplink capacity for Rayleigh fading channels with maximum ratio detection was derived.
Journal ArticleDOI
Sum-Rate and Power Scaling of Massive MIMO Systems With Channel Aging
TL;DR: It is found that, for a system with/without channel prediction, the transmit power of each user can be scaled down at most by 1/√M, which indicates that aged CSI does not degrade the power scaling law, and channel prediction does not enhance the power scaled law.
Journal ArticleDOI
Impact of General Channel Aging Conditions on the Downlink Performance of Massive MIMO
TL;DR: In this paper, the authors investigated the impact of channel aging on massive MIMO systems by considering a generalized model and showed that both Doppler shift due to the users' relative movement, as well as phase noise due to noisy local oscillators, contribute to channel aging.
Journal ArticleDOI
Sum Rate Analysis of ZF Receivers in Distributed MIMO Systems
TL;DR: This paper elaborate on the sum rate of D-MIMO systems employing linear zero-forcing receivers, accounting for both large and small-scale fading effects, as well as spatial correlation at the transmit side.
References
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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
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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.