I tried to output the OFDM (BPSK/QPSK modulated sub-carriers) signal from AD9957 but could not. I set the parameters as QDUC mode.
The main specifications are as follows.
DAC reference clock frequency: 260 MHz
Output carrier frequency: 65MHz
FFT size: 256
Output level:-25 dBm
Sub-carrier Modulation: BPSK/QPSK
IQ baseband signal rate:
QPSK: 60 carriers 63.5spsx160=10.16 Msps
BPSK:19 carriers） 63.5spsx19=1.2065Msps
Baseband filter: CIC filter interporation 8
I attached the detailed register values. Please find the attached file. I could not output the OFDM signal with those register values. It does not seem to work as the QDUC mode.
Does any body know how to create the OFDM signal or how to operate as the QDUC mode?