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- W137358029 abstract "The throughput gained by employing adaptive modulation and scheduling in cellular communications systems depend on the amount of channel feedback used and the quality of the quantization of the channel information. We discuss the implications of using a rate quantization which maximizes the expected down-link throughput, and give a procedure for choosing the optimal number of bits for feedback. It turns out that unless the number of users is much less than the number of symbols that constitute a time slot, no more than 1 bit should be used for feedback. We also note that utilizing multiuser diversity, i.e. scheduling transmissions to increase throughput, has a theoretical performance advantage as compared to fixed channel access when the amount of channel information is reduced. On the other hand, unfairness increases, and due to an inherent sensitivity to incorrectly chosen quantization levels, there is a risk of occasional drastic performance drops, to levels below that of fixed access. We further investigate on-line adaptation of quantization levels as the channels and the number of users vary. A scheduling and adaptive quantization policy for high throughput and quality-of-service requirements in terms of hard inter-access bounds is developed which is shown to combine the advantages of multiuser diversity without compromising fairness. The policy is well-suited for the multiple-channel case, gives a considerable throughput gain with little channel feedback, and facilitates real-time services." @default.
- W137358029 created "2016-06-24" @default.
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- W137358029 date "2004-01-01" @default.
- W137358029 modified "2023-09-27" @default.
- W137358029 title "On Scheduling and Adaptive Modulation with Limited Channel Feedback" @default.
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