Estimation for instantaneous frequency using a combined fractional time-frequency representation

作者：Li, Jiaqiang^*; Jin, Ronghong; Geng, JunPing

来源：IEICE - Transactions on Communications, 2007, E90B(1): 189-191.

DOI：10.1093/ietcom/e90-b.1.189

• time-frequency representations
• short-time Fourier transform
• Wigner distribution
• instantaneous frequency

In this letter, a combined method based on the fractional linear and the fractional bilinear time-frequency representations (TFRs) is proposed. The method combines the windowed fractional short-time Fourier transform with the fractional Wigner distribution (WD) to estimate the instantaneous frequency (IF) of signals in the appropriate fractional time-frequency domain. For a multi-component signal, the method can significantly eliminate the cross terms and improve the time-frequency resolution of the auto-terms. It is applied to the detection and parameter estimation of linear frequency modulated (LFM) signals. The computer simulations clearly demonstrate that the method is effective.

• 出版日期2007-1
• 单位上海交通大学