Proceedings ArticleDOI
Downlink Power Allocation for Distributed Antenna Systems in a Multi-Cell Environment
Wei Feng,Yunzhou Li,Shidong Zhou,Jing Wang +3 more
- pp 347-350
TLDR
The downlink performance of distributed antenna systems (DAS) in a multi-cell environment is investigated and a simple sub-optimal power allocation scheme is proposed by substituting the approximation for the objective function.Abstract:
In this paper, the downlink performance of distributed antenna systems (DAS) in a multi-cell environment is investigated. The individual power constraints (IPC) for the distributed antennas and the total power constraint (TPC) for all the distributed antennas are proposed to characterize the inter-cell interference power limits and the total transmit power consumption, respectively. When the large-scale channel state information is available at the transmitter, the problem of power allocation among distributed antennas with the target of downlink ergodic capacity maximization is formulated with consideration of IPC and TPC. Based on system scale-up, an approximation of the objective function is derived, which is further proved to be concave on the transmit powers of the distributed antennas. Consequently, a simple sub-optimal power allocation scheme is proposed by substituting the approximation for the objective function. The system capacity with the sub-optimal power allocation is illustrated to be quite close to the optimal one obtained by numerical optimizations.read more
Citations
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Patent
Method and apparatus for coupling an antenna to a device
Paul Shala Henry,Donald J. Barnickel,Farhad Barzegar,Robert Bennett,Irwin Gerszberg,Thomas M. Willis +5 more
TL;DR: In this paper, the authors describe a system that receives, by a feed point of a dielectric antenna, electromagnetic waves from a core coupled to the feed point without an electrical return path, and radiates a wireless signal responsive to the electromagnetic waves being received at the aperture.
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Backhaul link for distributed antenna system
Paul Shala Henry,Donald J. Barnickel,Farhad Barzegar,George Blandino,Irwin Gerszberg,Thomas M. Willis +5 more
TL;DR: In this paper, a distributed antenna and backhaul system provide network connectivity for a small cell deployment using high-bandwidth, millimeter-wave communications and existing power line infrastructure, rather than building new structures, and installing additional fiber and cable.
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Farhad Barzegar,Donald J. Barnickel,George Blandino,Irwin Gerszberg,Paul Shala Henry,Thomas M. Willis +5 more
TL;DR: In this article, a distributed antenna system is provided that frequency shifts the output of one or more microcells to a 60 GHz or higher frequency range for transmission to a set of distributed antennas.
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Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves
TL;DR: In this article, the authors describe a device that facilitates transmitting electromagnetic waves along a surface of a wire that facilitates delivery of electric energy to devices, and sensing a condition that is adverse to the electromagnetic waves propagating along the surface of the wire.
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Method and apparatus that provides fault tolerance in a communication network
Paul Shala Henry,Robert Bennett,Irwin Gerszberg,Farhad Barzegar,Donald J. Barnickel,Thomas M. Willis +5 more
TL;DR: In this article, a system for detecting a fault in a first wire of a power grid that affects a transmission or reception of electromagnetic waves that transport data and that propagate along a surface of the first wire is described.
References
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Book
Convex Optimization
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TL;DR: In this article, the focus is on recognizing convex optimization problems and then finding the most appropriate technique for solving them, and a comprehensive introduction to the subject is given. But the focus of this book is not on the optimization problem itself, but on the problem of finding the appropriate technique to solve it.
Journal ArticleDOI
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Journal ArticleDOI
Downlink performance and capacity of distributed antenna systems in a multicell environment
Wan Choi,Jeffrey G. Andrews +1 more
TL;DR: Analytically quantifies downlink capacity of multicell DAS for two different transmission strategies: selection diversity and blanket transmission, and shows that selection diversity is preferable to blanket transmission in terms of achievable ergodic capacity.
Journal ArticleDOI
Distributed Antennas for Indoor Radio Communications
TL;DR: In this article, the authors present the results of indoor radio propagation measurements of two signal distribution approaches that improve the picture dramatically and show that, with either approach, the signal attenuation can be reduced by as much as a few tens of decibels and the rms delay spread becomes limited to 20 to 50 us, even in large buildings.
Proceedings ArticleDOI
Outage performance of the distributed antenna systems in a composite fading channel
Wonil Roh,Arogyaswami Paulraj +1 more
TL;DR: This work investigates the effect of macroscopic and microscopic diversity of the proposed system on outage SNR performance and compares with the conventional architectures through analysis and simulation under a composite fading channel.