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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/7538
Title: Tradeoff analysis of delay-power-CSIT quality of dynamic backpressure algorithm for energy efficient OFDM systems
Authors: LAU, Vincent K. N.
Koh, Chung Ha
Keywords: Power-delay tradeoff
Dynamic backpressure (DBP) algorithm
Point-to-point OFDM systems
Instantaneous channel state information (CSIT)
Queue state information (QSI)
Issue Date: Jan-2011
Citation: IEEE transactions on signal processing, v. 60, no. 8, August 2012, p. 4254-4263
Abstract: In this paper, we analyze the fundamental power-delay tradeoff in point-to-point OFDM systems under imperfect channel state information quality and non-ideal circuit power. We consider the dynamic backpressure (DBP) algorithm, where the transmitter determines the rate and power control actions based on the instantaneous channel state information (CSIT) and the queue state information (QSI). We exploit a general fluid queue dynamics using a continuous time dynamic equation. Using the sample-path approach and renewal theory, we decompose the average delay in terms of multiple unfinished works along a sample path, and derive an upper bound on the average delay under the DBP power control, which is asymptotically accurate at small delay regime. We show that despite imperfect CSIT quality and non-ideal circuit power, the average power (P) of the DBP policy scales with delay (D) as P = O(Dexp(1/D)) at small delay regime. While the impacts of CSIT quality and circuit power appears as the coefficients of the scaling law, they may be significant in some operating regimes.
Rights: © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
URI: http://hdl.handle.net/1783.1/7538
Appears in Collections:ECE Journal/Magazine Articles

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