conradza
Newbie level 3
My project is to demodulate a SSB signal using a Freescale DSP Micro. I have completed the code for the FFT, filter and then IFFT with overlap add etc. Sampling is done at 20 kHz.
What I am not sure if is how exactly is the SSB demodulation done with one complex FFT.
What I know is:
The I and Q channels are fed into the Real and Imaginary values for the FFT.
In the frequency domain the values are multiplied with the filter coefficients.
After the inverse transform, the Real and Imaginary channels are added or subtracted to get LSB or USB.
What I do not know is what else is done to get the second 90 degree shift for SSB demodulation.
Conrad
What I am not sure if is how exactly is the SSB demodulation done with one complex FFT.
What I know is:
The I and Q channels are fed into the Real and Imaginary values for the FFT.
In the frequency domain the values are multiplied with the filter coefficients.
After the inverse transform, the Real and Imaginary channels are added or subtracted to get LSB or USB.
What I do not know is what else is done to get the second 90 degree shift for SSB demodulation.
Conrad