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
Journal ArticleDOI
Nearly-optimal scheduling of users with Markovian time-varying transmission rates
F. Cecchi,Peter Jacko +1 more
TL;DR: A scheduler which generalizes the recently proposed Potential Improvement (PI) scheduler, which gives priority to the users who are unlikely to improve their actual transmission rate soon by much, and proposes two practical approximations of PI, whose performance is analyzed and compared to existing alternative schedulers.
Journal ArticleDOI
Joint Space–Frequency User Scheduling for MIMO Random Beamforming With Limited Feedback
Jiancao Hou,Na Yi,Yi Ma +2 more
TL;DR: This paper presents a joint space-frequency user scheduling approach to enhance the random beamforming (RBF) with limited feedback in multiple-input -multiple-output (MIMO) broadcast channels and shows that the first strategy achieves close performance to the corresponding brute-force search with lower complexity.
I-wlan: intelligent wireless local area networking
Mustafa Ergen,Pravin Varaiya +1 more
TL;DR: A new Markov model for Distributed Coordination of Function of IEEE 802.11 is introduced with which the throughput and delay for saturated and non-saturated traffic is formulated, and a novel formulation for individual throughput when stations operate with mixed data rates is introduced.
Proceedings ArticleDOI
Scaling Law of the Sum-Rate for Multi-Antenna Broadcast Channels with Deterministic or Selective Binary Feedback
TL;DR: The optimal scaling law of the sum-rate is shown to be achievable with an even smaller amount of feedback and, more precisely, with an average number of feedback bits that scales as M log2M log n with the number of users n, if a selective (random) feedback scheme is employed.
Proceedings ArticleDOI
Robust exploitation of spatial and multi-user diversity in limited-feedback systems
TL;DR: It is shown that spatial diversity gains, provided by antenna selection mechanisms and space-time block coding, clearly exceed those of multi-user diversity in a cellular system with limited feedback.
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.