5622- sample length

[BSharmi]

Hi,

I am usin PXIe-5663 as the receiver in a transceiver where the received signal is a continuous modulated 2.4GHz signal . I want to compute the FFT of the received signal. I read that to compute FFT(x,N) where N is the number of points in the FFT, N must be atleast as large as the number of samples of x[n].

Is there a way to know the number of points in the signal after it is digitized by PXie-5622? I am using NI_Acquire continous I/Q vi. Is the sample length dependen on the I/Q acquistion rate?

Thanks!

[Tarek]

Hi BSharmi,

All we need to know is the number of points in the array/waveform going into the FFT block. If it's an array we can use the Array Size function, if it's a waveform we can us the Get Waveform Components followed by Array Size. Can you please post a piece of code so I can see how you're obtaining the FFT?