Proceedings Article10.1109/VETECS.2005.1543519
Exploiting multiuser diversity using multiple feedback thresholds
V. Hassel,Mohamed-Slim Alouini,David Gesbert,Geir E. Oien +3 more
- 05 Dec 2005
- Vol. 2, pp 1302-1306
TL;DR: A novel scheduling algorithm that takes advantage of multiuser diversity to obtain the maximum system spectral efficiency and uses multiple feedback thresholds to reduce the feedback load to a minimum is described and closed-form expressions for the overall capacity using quantized feedback are developed.
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Abstract: This paper describes a novel scheduling algorithm that takes advantage of multiuser diversity to obtain the maximum system spectral efficiency and uses multiple feedback thresholds to reduce the feedback load to a minimum. In this scenario the relevant users are probed with a set of carrier-to-noise ratio (CNR) thresholds. The users are first probed with the highest threshold. If none of the users are above this threshold the threshold value is sequentially lowered until one or more users are found. A closed-form expression for the average, normalized feedback load (NFL) is found. It can be argued that it is wise to minimize this average NFL to minimize the guard time needed for the feedback process. Consequently, the optimal CNR thresholds which minimize the average NFL are found. We also develop closed-form expressions for the overall capacity using quantized feedback. Plots show that the number of transmitted symbols between feedback queries has great impact on the overall capacity and that one bit feedback is optimal in all cases. The scheduling outage probability has also been analyzed, and the results show that the scheduling outage probability increases dramatically when a scheduling deadline is exceeded.
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Citations
Multi-Mode Transmission for the MIMO Broadcast Channel with Imperfect Channel State Information
TL;DR: The proposed adaptive multi-mode transmission strategy to improve the spectral efficiency achieved in the multiple-input multiple-output (MIMO) broadcast channel with delayed and quantized channel state information provides performance close to that achieved by opportunistic scheduling with instantaneous feedback from a large number of users.
166
Space Division Multiple Access With a Sum Feedback Rate Constraint
TL;DR: Numerical results show that the proposed SDMA design is capable of attaining higher sum capacities than existing ones, even though the sum feedback rate is bounded, and is shown to achieve a sum capacity growth rate close to the optimal one.
161
Compression of Feedback for Adaptive Transmission and Scheduling
Thomas Eriksson,Tony Ottosson +1 more
- 06 Dec 2007
TL;DR: This paper study how the feedback rate can be minimized, without losing the gains due to adaptive modulation and multiuser diversity, and evaluates the performance of several state-of-the-art channel quality feedback schemes.
Compressive Sensing for Feedback Reduction in MIMO Broadcast Channels
TL;DR: The proposed techniques are shown to reduce the feedback overhead, improve CS detection at the BS, and achieve a sum-rate close to that obtained by noiseless dedicated feedback channels.
65
Compression of Feedback for Adaptive Transmission and Scheduling : In multiuser wireless radio systems, it may be possible to increase throughput by reducing the feedback-rate of channel quality data while meeting quality of service requirements
Thomas Eriksson,Tony Ottosson +1 more
- 01 Jan 2007
TL;DR: In this article, the authors present an in-depth study of the literature in the area, and evaluate the performance of several state-of-the-art channel quality feedback schemes.
60
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