Proceedings ArticleDOI
Information capacity and power control in single-cell multiuser communications
Raymond Knopp,Pierre A. Humblet +1 more
- Vol. 1, pp 331-335
TLDR
By examining the bit error-rate with antipodal signalling, it is shown that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large, and the inherent diversity in multiuser communications over fading channels is shown.Abstract:
We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels.read more
Citations
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Video streaming performance under proportional fair scheduling
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Evaluation of an adaptive power and error control algorithm for wireless systems
TL;DR: Simulation results from a cellular system with mobile users show that this unified algorithm outperforms the schemes that use power control alone.
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Joint network-wide opportunistic scheduling and power control in multi-cell networks
TL;DR: It is proven that binary power control of base stations is necessary and sufficient for maximizing the network-wide utilities under a physical layer regime where the channel capacity is linear in the signal-to-interference-noise ratio.
Proceedings ArticleDOI
Downlink scheduling in a cellular network for quality of service assurance
Dapeng Wu,Rohit Negi +1 more
TL;DR: This work designs simple and efficient admission control, resource allocation, and scheduling algorithms for guaranteeing requested QoS guarantees, and designs the RC scheduler as a linear program, dispensing with complex dynamic programming approaches, by the use of a resource allocation scheme.
Journal ArticleDOI
Opportunistic CSMA/CA for achieving multi-user diversity in wireless LAN
Chan-Soo Hwang,John M. Cioffi +1 more
TL;DR: An opportunistic carrier-sense multiple-acces/collision-avoidance (CSMA/CA) scheme that exploits multi-user diversity while minimally modifying the IEEE 802.11 medium-access control improves the throughput by as much as 100%, while achieving long-term fairness among users with different channel conditions.
References
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TL;DR: Some information-theoretic considerations used to determine upper bounds on the information rates that can be reliably transmitted over a two-ray propagation path mobile radio channel model, operating in a time division multiplex access (TDMA) regime, under given decoding delay constraints are presented.
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Shannon-theoretic approach to a Gaussian cellular multiple-access channel
TL;DR: Shannon-theoretic limits for a very simple cellular multiple-access system, and a scheme which does not require joint decoding of all the users, and is, in many cases, close to optimal.
Journal ArticleDOI
Estimate of channel capacity in Rayleigh fading environment
TL;DR: In this article, the authors derived the channel capacity in a Rayleigh fading environment and showed that channel capacity is always lower than that in a Gaussian-noise environment and that diversity schemes can improve channel capacity.