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Mathematical Problems in Engineering
Volume 2014, Article ID 658093, 9 pages
http://dx.doi.org/10.1155/2014/658093
Research Article

A Pan-Function Model for the Utilization of Bandwidth Improvement and PAPR Reduction

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China

Received 7 June 2014; Revised 4 September 2014; Accepted 18 September 2014; Published 19 October 2014

Academic Editor: Marek Lefik

Copyright © 2014 Yidong Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aiming at the digital quadrature modulation system, a mathematical Pan-function model of the optimized baseband symbol signals with a symbol length of was established in accordance with the minimum out-band energy radiation criterion. The intersymbol interference (ISI), symbol-correlated characteristics, and attenuation factor were introduced to establish the mathematical Pan-function model. The Pan-function was added to the constraints of boundary conditions, energy of a single baseband symbol signal, and constant-envelope conditions. Baseband symbol signals with the optimum efficient spectrum were obtained by introducing Fourier series and minimizing the Pan-function. The characteristics of the spectrum and peak-to-average power ratio (PAPR) of the obtained signals were analyzed and compared with the minimum shift keying (MSK) and quadrature phase-shift keying (QPSK) signals. The obtained signals have the characteristics of a higher spectral roll-off rate, less out-band radiation, and quasi-constant envelope. We simulated the performance of the obtained signals, and the simulation results demonstrate that the method is feasible.