FFT for 1GHz signal with 1Hz Spectral density

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analogy 2015-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/242989-fft-for-1ghz-signal-with-1hz-spectral-density

评论： Walter Roberson 2015-9-15

Suppose that I have a 1GHz signal sample at 100GHz.If I wish to find spectrum of this signal (I need 1Hz resolution), I need to have approximately 2^36 FFT bins.Now the question is , how can one simulate FFT with such huge array size on a standard notebook with standard configuration ?

I don't mind waiting for few hours (I tried before) and I had array size error (says it exceeded 7.5 gb space).

Also, do you have any suggestion if I need spectral accuracy at low frequency ? Thanks.

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Walter Roberson 2015-9-15

You indicate the frequency of your signal of interest and you indicate the sample rate, but we need to have an idea of how large your original array is.

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