NDLI: Iterative Linear-Programming-Based Route Optimization for Cooperative Networks

Content Provider	IEEE Xplore Digital Library
Author	Draper, S.C. Lingjia Liu Molisch, A.F. Yedidia, J.S.
Copyright Year	2008
Description	Author affiliation: Dept. of ECE, Univ. of Wisconsin, Madison, WI (Draper, S.C.)
Abstract	In this paper we develop linear-programming (LP) based route optimization techniques for networks of relays that employ mutual-information accumulation at the physical layer. Motivated by applications to unicast transmission in ultra wideband communications we concentrate on the regime where each node has a fixed bandwidth and transmission power. Our goal is to find the cooperative route that minimizes the source- to-destination transmission duration subject to a sum-energy constraint. We tackle this problem by solving a sequence of LP-based route optimizations under increasingly tight energy constraints, revealing a trade-off between energy consumption and delay. An initial route is found by "flooding" the network, resulting in the smallest delay, but largest energy consumption. Successive routes are found by initializing the LP with the optimum route found at the (slightly higher) previous energy constraint. Through this iterative procedure we explore a massive parameter space to find locally (and often globally) optimum solutions very efficiently. We illustrate our method for a network consisting of 50 nodes and compare the results to classic routing approaches. We comment on the applicability of our framework to other bandwidth and energy constraints, objective functions, and to multicasting.
Starting Page	84
Ending Page	87
File Size	184298
Page Count	4
File Format	PDF
ISBN	9781424416813
DOI	10.1109/IZS.2008.4497282
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-12
Publisher Place	Switzerland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Routing Bandwidth Relays Physical layer Energy consumption Delay Transmitters Throughput Iterative algorithms Electronic mail
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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