Qualcomm DSP Modem Staff Engineer interview questions

There were 2 phone interviews with one being with manager about the job details and the second one with a technical person.(mostly basics of your work/signal processing/fixed point). Once you are through with them, you are invited to Hyd for a series of discussion with about 2-3 managers and 2-3 senior technical persons. Interview for me was about OFDM basics/ fixed point implementations/ some GSM-CDMA basics/ designing an interrupt based system.... Unfortunately, I had lost touch with GSM-CDMA and did not get through the interview