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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Proceedings ArticleDOI
On ergodic sum capacity of fading cognitive multiple-access channel
TL;DR: The information-theoretic limits of a cognitive radio (CR) network under spectrum sharing with an existing primary radio (PR) network for wireless communications are studied, where multiple CR users transmit to the base station of the CR network under both individual transmit power constraints and a set of interference-power constraints each applied at one of the PR receivers.
Proceedings ArticleDOI
Channel Aware Distributed Scheduling for Exploiting Multi-Receiver Diversity and Multiuser Diversity in Ad-Hoc Networks: A Unified PHY/MAC Approach
TL;DR: It is shown that the optimal scheduling policies for all proposed probing mechanisms exhibit threshold structures, indicating that they are amenable to easy distributed implementation, and the optimal thresholds and the maximum network throughput can be obtained off-line by solving fixed point equations.
Proceedings ArticleDOI
Opportunistic Scheduling with Frame Aggregation for Next Generation Wireless LANs
TL;DR: This paper argues that existing opportunistic schemes are not optimal when frame aggregation is used, and proposes new scheduling approaches that combine channel states with queue states that offer significant improvement in network throughput over non-opportunistic and greedy schedulers.
Proceedings ArticleDOI
Decode-and-Forward Cooperative Networks with Multiuser Diversity
Zhihang Yi,Il-Min Kim +1 more
TL;DR: A new scheme to combine the decode-and-forward protocol with the multiuser diversity is proposed and it is shown that the new scheme substantially increases the diversity order from approximately K/2+1 to K2/2-1, where K is number of relay terminals.
Proceedings ArticleDOI
Energy-Efficient Multi-User Resource Management with IR-HARQ
Ye Wu,Shugong Xu +1 more
TL;DR: A basic tradeoff between energy efficiency, power, bandwidth and delay of IR-HARQ is developed, which reveals that frequency domain, rather than power domain, offers a larger space for exploiting energy efficiency with delay constraints.
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.