NDLI: Theoretical Analysis of Power Saving in Cognitive Radio With Arbitrary Inputs

Content Provider	IEEE Xplore Digital Library
Author	Sohail, A. Al-Imari, M. Pei Xiao Evans, B.G.
Copyright Year	1967
Abstract	In orthogonal frequency-division multiplexing (OFDM)-based cognitive radio (CR) systems, power optimization algorithms have been evaluated to maximize the achievable data rates of the secondary user (SU). However, unrealistic assumptions are made in the existing work, i.e., a Gaussian input distribution and traditional interference model that assumes a frequency-division multiplexing modulated primary user (PU) with perfect synchronization between the PU and the SU. In this paper, we first derive a practical interference model by assuming OFDM modulated PU with imperfect synchronization. Based on the new interference model, the power optimization problem is proposed for the finite symbol alphabet (FSA) input distribution [i.e., M-ary quadrature amplitude modulation (M-QAM)] , as used in practical systems. The proposed scheme is shown to save transmit power and to achieve higher data rates compared with the Gaussian optimized power allocation and the uniform power loading schemes. Furthermore, a theoretical framework is established in this paper to estimate the power saving by evaluating optimal power allocation for the Gaussian and the FSA input. Our theoretical analysis is verified by simulations and is proven to be accurate. It provides guidance for the system design and gives deeper insights into the choice of parameters affecting power saving and rate improvement.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	2175
Ending Page	2180
Page Count	6
File Size	1009946
File Format	PDF
ISSN	00189545
Volume Number	64
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Resource management OFDM Loading Binary phase shift keying Load modeling Synchronization orthogonal frequency-division multiplexing (OFDM) Cognitive radio (CR) finite symbol alphabet (FSA) minimum mean square error (MMSE) mutual information (MI)
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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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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