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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Journal ArticleDOI
Radio resource allocation problems for OFDMA cellular systems
TL;DR: It is proved that the problem of resource allocation in the downlink of a multi-cellular OFDMA system is strongly NP-hard, and an exact approach based on an MILP formulation is presented and two heuristic algorithms designed to be simple and fast are proposed.
Proceedings ArticleDOI
Exploiting Multi-Antennas for Opportunistic Spectrum Sharing in Cognitive Radio Networks
Rui Zhang,Ying-Chang Liang +1 more
TL;DR: This paper exploits multi-antennas at the secondary transmitter to balance effectively between spatial multiplexing and interference avoidance and presents optimal and suboptimal algorithms for design of the secondary user's transmit spatial spectrum.
Proceedings ArticleDOI
Opportunism in Multiuser Relay Channels: Scheduling, Routing and Spectrum Reuse
TL;DR: This paper analyzes the spectral efficiency of opportunistic scheduling algorithms over a fading multiuser relay channel with K users in the asymptotic regime of large (but finite) number of users and describes the limiting distribution of spectral efficiency focusing on Type I convergence.
Journal ArticleDOI
Cross Layer QoS Guarantees in Multiuser WLAN Systems
TL;DR: A cross-layer based dynamically tuned queue length scheduler is presented in this paper, for the Downlink of multiuser WLAN systems with heterogeneous traffic requirements.
Proceedings ArticleDOI
Spectral Efficiency and Fairness for Opportunistic Round Robin Scheduling
TL;DR: This paper analyzes the Opportunistic Round Robin (ORR) scheduling algorithm, which is able to exploit multiuser diversity (MUD) and at the same time provide short-term fairness between the users in a wireless cellular network.
References
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Information Theory and Reliable Communication
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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.