FFT spike at center frequence?

GNU Radio
1

All,

Since I’m now involved in the project using the USRP, and am looking at
FFT’s acquired, I recall some mention of a DC component of the resulting
FFT due to ‘hardware’.

What is the general approach that folks have used to deal with this
problem.

Thanks,
John C…

2

John C. wrote:

All,

Since I’m now involved in the project using the USRP, and am looking at
FFT’s acquired, I recall some mention of a DC component of the resulting
FFT due to ‘hardware’.

What is the general approach that folks have used to deal with this
problem.

Thanks,
John C…

A DC component in the frequency spectrum is from a high average in the
sequence.
If you don’t want to see the DC component try something like the
following
pseudo-code:

#input array - x
#mean is the arithmetic average sum(x)/length(x)
fft(x-mean(x))

cheers,
–Mitchell