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• W2012254837 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." @default.
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• W2012254837 date "2015-05-01" @default.
• W2012254837 modified "2023-09-26" @default.
• W2012254837 title "Theoretical Analysis of Power Saving in Cognitive Radio With Arbitrary Inputs" @default.
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• W2012254837 doi "https://doi.org/10.1109/tvt.2014.2338054" @default.
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