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
Degrees of freedom in wireless multiuser spatial multiplex systems with multiple antennas
Wei Yu,Wonjong Rhee +1 more
TL;DR: This letter shows that the optimal transmission strategy in an uplink or downlink channel with n antennas at the base-station involves more than n users at the same time, and gives a dimension-counting interpretation for multiuser diversity.
Journal ArticleDOI
Quality of Service in mobile ad hoc networks: a survey
Ash Mohammad Abbas,Oivind Kure +1 more
TL;DR: A review of the current research related to the provision of QoS in an ad hoc environment is presented and salient features of various solutions and approaches are compared and point out directions for future work.
Journal ArticleDOI
Delay-Optimal Server Allocation in Multiqueue Multiserver Systems With Time-Varying Connectivities
Somsak Kittipiyakul,Tara Javidi +1 more
TL;DR: This paper uses dynamic programming (DP) and properties of the value function to establish the delay optimality of a policy, which, at each time-slot, simultaneously maximizes the instantaneous throughput and balances the queues.
Journal ArticleDOI
Sensor Networks With Mobile Access: Energy and Capacity Considerations
TL;DR: This paper considers SENMA from energy-efficiency and information-theoretic perspectives, and the potential of offering orders of magnitude of improvement in energy efficiency over the multihop ad hoc architecture, as demonstrated by the analysis on scalability.
Dissertation
Cross-Layer Resource Allocation and Scheduling in Wireless Multicarrier Networks
TL;DR: This thesis establishes a utility optimization framework for resource allocation in wireless OFDM networks based on joint physical and medium access control (MAC) layer optimization and exploits the time variance and frequency selectivity of wireless channels through adaptive modulation, coding, and modulation and coding techniques employed in the network.
References
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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.