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论文类型： 期刊论文

发表时间： 2009-09-01

发表刊物： ICIC Express Letters

收录刊物： EI、Scopus

卷号： 3

期号： 3

页面范围： 385-390

ISSN号： 1881803X

摘要： This paper presents a new method for parameter estimation of a quadraticfrequency modulated (QFM) signal based on the fractional Fourier transform(FRFT). Firstly, the proposed algorithm transforms the QFM signal into a linearfrequency modulated (LFM) signal by means of instantaneous correlation function,and then the parameter estimation of the QFM signal is performed by the FRFTand dechirping method. Subsequently, the effects of the delay parameter on theestimation performances are studied by a first-order perturbation analysis andthe criteria for selecting delay parameter are pointed out too. The results ofstatistical analysis show that the estimated MSE of the proposed algorithm canapproximate the Cramer-Rao lower bounds (CRLB) by the reasonable choice of delayparameter at high SNR. ICIC International ? 2009.