Abstract
The joint time frequency representation characterize a signal over a time frequency domain simultaneously. The combination yields a potentially more revealing representation of the temporal localization of a signal's spectral components. So the time frequency representation offers an effective tool for analyzing the time varying property of the target echo. In this paper the time frequency analysis of a large time bandwidth product signal formed by combining the orthogonal frequency division multiplexing and the linear frequency modulated (OFDM-LFM) is discussed using the linear and quadratic time frequency distributions like short time Fourier transform, wavelet transform and Winger-Ville distribution. A concise review of the problem of spectrum estimation and various time frequency methods are discussed as the back ground of the study. The performance of the various time frequency representations are analyzed through simulations. The results clearly demonstrate the significant improvements in the time frequency analysis of the signal in a scenario of low signal to noise condition.
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