05-25-2010 01:41 PM
Hallo,I worked with the Altera FFT Megafunction.At the output i have an imaginery and a real part. but the output (sourcereal and sourceim)in the simulator is time-dependent. How can i get the frequency-spectrum for the signal? and how can i analyse the output, if its right or wrong?
05-25-2010 03:11 PM
The I/Q of fft is the frequency domain.so just plot the absolute value of output. IQ = I + jQ; power = 20* log10(abs(IQ)); %dB f = linspace(-.5*Fs,.5*Fs,fft_points) % if centered on dc else %f = linspace(0,1*Fs,fft_points); %Fs = fft clock frequency plot(f,power)