frequeny domain signal into time domain signal

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kingcruises
kingcruises 2020-1-14
回答： Star Strider 2020-1-14
Please help
I have extracted data from a plot which is power(dbm) as function of frequency
How do I transform the x axis to time domain signal Instead of frequency domain signal
Please find attached the data below.

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回答（2 个）

Raj
Raj 2020-1-14
Your question is basically to convert the frequency domain data to time domain.
Use 'ifft' command. See details here:
https://www.mathworks.com/help/ident/ug/transforming-between-time-and-frequency-domain.html
Star Strider
Star Strider 2020-1-14
The ‘outputtransmitterADS.txt’ file has dB as a function of frequency.
There are two problems:
First: The frequency goes from 1E+9 to 3E+9. It needs to be continuous from 0 to 3E+9 to be able to invert it correctly.
Second: Even if the frequencies were continuous from 0 to 3E+9, there is not enough information to invert these data to get a time-domain signal. If the file contained both the real and imaginary parts of the transformed signal, or the amplitude and phase, it would be possible to invert it to the time domain.
So unfortunately, it is not possible to invert these data to the time domain.

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