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  • $\begingroup$ Thanks a lot again for your kind help. Your method of adding a window really suppressed the multi-peak. But, this window is too small and raw data was partially changed. The bandwidth information is the most important information for me. Is it possible to design a bigger window such that the raw data is changed as few as possible? $\endgroup$ Commented Apr 5, 2016 at 4:25
  • $\begingroup$ @user14634 - I think that is specifically not possible. That is, with this data, it is not possible to extract a single frequency and bandwidth. In your post you said you wanted a single peak, and the only way to do that with this data, to my knowledge, is to apply the window and broaden the two peaks such that they merge. $\endgroup$ Commented Apr 5, 2016 at 6:59
  • $\begingroup$ @ JasonB, I have already known the center frequency, since I can measure the center frequency in experiment by using other devices, e.g., a spectrometer. What I most want to obtain from this time-domain interference data, is the bandwidth, i.e., the time-domain width and the frequency-domain width (after Fourier transform). $\endgroup$ Commented Apr 5, 2016 at 9:30
  • $\begingroup$ @user14634 and is that center frequency in the center of the two peaks you get above? $\endgroup$ Commented Apr 5, 2016 at 9:31
  • $\begingroup$ @ JasonB, Yes, the frequency center should be 0.2124. $\endgroup$ Commented Apr 5, 2016 at 9:53