Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
Reads0
Chats0
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
More filters
Proceedings ArticleDOI
Analysis of the pilot contamination effect in very large multicell multiuser MIMO systems for physical channel models
TL;DR: The so-called pilot contamination effect discovered in previous work is analyzed, and it is shown that this effect persists under the finite-dimensional channel model that is considered.
Patent
Method and apparatus for proximity sensing
Robert Bennett,Paul Shala Henry,Irwin Gerszberg,Farhad Barzegar,Thomas M. Willis,Donald J. Barnickel +5 more
TL;DR: In this paper, the first device can detect a physical object in proximity to the transmission medium according to a change in the parameter associated with the electromagnetic waves, and the second device is able to detect the object according to the change.
Patent
Dual-band communication device and method for use therewith
TL;DR: In this paper, a method for use with a communication device that includes: communicating in a first frequency band with a remote device via at least one transceiver, wherein the remote device is oriented at a direction relative to the communication device, and communicating is in accordance with first antenna beam steering parameters and a first antenna beacon corresponding to the direction.
Patent
Dielectric dish antenna system and methods for use therewith
TL;DR: In this article, the first wireless signal is received via a feed point on an antenna body, wherein the antenna body includes a dielectric core having a reflective surface configured as a dish reflector.
Patent
Apparatus and methods for selectively targeting communication devices with an antenna array
Shikik Johnson,David M. Britz,Paul Shala Henry,Robert Bennett,Farhad Barzegar,Irwin Gerszberg,Donald J. Barnickel,Thomas M. Willis +7 more
TL;DR: In this paper, the authors proposed a method for detecting a communication device in transit, determining a trajectory of the communication device, selecting a section from a plurality of sections of an array of dielectric antennas according to the trajectory of communication device.
References
More filters
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.