NDLI: Online power allocation for maximizing mutual information in cognitive radio system

Content Provider	IEEE Xplore Digital Library
Author	Vaze, Rahul
Copyright Year	2013
Description	Author affiliation: Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India (Vaze, Rahul)
Abstract	The design of online algorithms for maximizing the achievable rate in a cognitive radio (CR) over a fixed number of slots under a sum-power constraint is considered. CR is allowed to transmit in slots unoccupied by the primary transmitter (PT), however, no information about future PT slot occupancy is known at the CR. The fading coefficients are also assumed to be arbitrarily varying over time, with only causal information available at the CR. For a maximization problem, the utility of an online algorithm is tested by finding its competitive ratio or competitiveness that is defined to be the maximum of the ratio of the gain of the optimal offline algorithm and the gain of the online algorithm over all input sequences. We show that the lower bound on the optimal competitive ratio for maximizing the achievable CR rate is arbitrarily close to the number of slots. Conversely, we propose a simple strategy that invests available power uniformly assuming all the future slots are going to be unoccupied, and show that its competitive ratio is equal to the number of slots, to conclude that it is an optimal online algorithm.
Starting Page	3352
Ending Page	3357
File Size	349388
Page Count	6
File Format	PDF
ISBN	9781467359382
ISSN	15253511
e-ISBN	9781467359399
e-ISBN	9781467359375
DOI	10.1109/WCNC.2013.6555101
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-07
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Upper bound AWGN channels Algorithm design and analysis Wireless communication Resource management Mutual information
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
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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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