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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Rate Maximization for Downlink OFDMA With Proportional Fairness
TL;DR: Numerical results show that the long-term fairness gives a substantially higher rate than the more stringent short- term fairness, which puts new insight into the achievable downlink OFDMA performance with proportional fairness and the effects of various system and channel parameters.
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Performance impact of interlayer dependence in infrastructure WLANs
TL;DR: A fresh look at IEEE 802.11 WLANs is taken and it is shown that TCP-over-WLAN prowess is facilitated by the self-regulating actions of DCF and TCP feedback control that jointly drive the shared channel at an effective load of two to three wireless stations, even when the number of active stations is large.
Journal ArticleDOI
Beam Selection Strategies for Orthogonal Random Beamforming in Sparse Networks
TL;DR: It is proved that most of the MUD can be still exploited with very few quantization bits and a beam selection approach trading-off system performance vs. feedback channel requirements is derived.
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Recent mum on the capacity of wideband channels in the low-power regime
TL;DR: This article gives a brief overview of recent results on the limits of reliable communication in the low-power wideband regime from the standpoint of information theory.
Journal ArticleDOI
An Opportunistic Channel Quality Feedback Scheme for Proportional Fair Scheduling
Hoon Kim,Youngnam Han +1 more
TL;DR: It is shown that the proposed scheme achieves system throughput comparable to the conventional scheme, where each and every user feeds back its CQIs, with significant feedback load reduction for each of the users.
References
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Book
Elements of information theory
Thomas M. Cover,Joy A. Thomas +1 more
TL;DR: The author examines the role of entropy, inequality, and randomness in the design of codes and the construction of codes in the rapidly changing environment.
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Information Theory and Reliable Communication
TL;DR: This chapter discusses Coding for Discrete Sources, Techniques for Coding and Decoding, and Source Coding with a Fidelity Criterion.
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Information theoretic considerations for cellular mobile radio
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.
Journal ArticleDOI
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.