NDLI: On optimal timer-based distributed selection for rate-adaptive multi-user diversity systems

Content Provider	IEEE Xplore Digital Library
Author	Suresh, A.T. Mehta, N.B. Shah, V.
Copyright Year	2010
Description	Author affiliation: Dept. of Electrical Communication Eng. at the Indian Institute of Science (IISc), Bangalore (Mehta, N.B.) \|\| Dept. of Electrical Eng. at the Indian Institute of Technology (IIT), Madras (Suresh, A.T.; Shah, V.)
Abstract	We develop an optimal, distributed, and low feedback timer-based selection scheme to enable next generation rate-adaptive wireless systems to exploit multi-user diversity. In our scheme, each user sets a timer depending on its signal to noise ratio (SNR) and transmits a small packet to identify itself when its timer expires. When the SNR-to-timer mapping is monotone non-decreasing, timers of users with better SNRs expire earlier. Thus, the base station (BS) simply selects the first user whose timer expiry it can detect, and transmits data to it at as high a rate as reliably possible. However, timers that expire too close to one another cannot be detected by the BS due to collisions. We characterize in detail the structure of the SNR-to-timer mapping that optimally handles these collisions to maximize the average data rate. We prove that the optimal timer values take only a discrete set of values, and that the rate adaptation policy strongly influences the optimal scheme's structure. The optimal average rate is very close to that of ideal selection in which the BS always selects highest rate user, and is much higher than that of the popular, but ad hoc, timer schemes considered in the literature.
Starting Page	1
Ending Page	5
File Size	605488
Page Count	5
File Format	PDF
ISBN	9781424463831
e-ISBN	9781424463862
DOI	10.1109/NCC.2010.5430221
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-29
Publisher Place	INDIA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Base stations Feedback Data communication Signal to noise ratio Propagation delay
Content Type	Text
Resource Type	Article

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