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
More filters
Patent
Modulation for broadcasting from multiple transmitters
TL;DR: In this article, the transmitted signal can be encoded using forward error correction coding techniques, which allows the receiver to recover all of the signal information despite some diminished reception, and provides time diversity so that receivers can have more consistent performance.
Journal ArticleDOI
Opportunistic carrier sensing for energy-efficient information retrieval in sensor networks
Qing Zhao,Lang Tong +1 more
TL;DR: It is shown that there is an optimal sensor density for which the opportunistic information retrieval is the most energy efficient, and the design of the optimal sensor duty cycle is proposed.
Journal ArticleDOI
Exploiting Quantized Channel Norm Feedback Through Conditional Statistics in Arbitrarily Correlated MIMO Systems
TL;DR: In this paper, quantized feedback of the squared Frobenius norm in a Rayleigh fading environment with arbitrary spatial correlation is considered and the conditional channel statistics are characterized and their moments are derived for both identical, distinct, and sets of repeated eigenvalues.
Proceedings ArticleDOI
Resource allocation for the wire-tap multi-carrier broadcast channel
Eduard A. Jorswieck,Anne Wolf +1 more
TL;DR: The secrecy rate is used as the objective function for resource allocation and the similarities and differences to the traditional power and sub-carrier allocations for sum capacity optimization are shown.
Journal ArticleDOI
On the average rate performance of hybrid-ARQ in quasi-static fading channels
TL;DR: It is shown that using Hybrid-ARQ (HARQ) can significantly improve theaverage rate performance, provided that the rate assignment between different ARQ rounds is carefully chosen, and optimal power allocation among retransmissions is derived and shown to further increase the average rate.
References
More filters
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.
Book
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.
Journal ArticleDOI
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.