Hi all , I implement qpsk demodulator on National instruments Fpga . Now i want to Demodulate Oqpsk signal . As the difference between qpsk and oqpsk is only the delay of one bit period in q channel.
Q1. Can a qpsk demodulator with some changes demodulate oqpsk data ?
Q2. If it works , what changes i should make ? flow of qpsk demodulater what i made.. 1. frequency shifter (input from step 4) 2. Matched filter 3. AGC 4. coarse frequency offset estimator (Rife and broostyn algorithm).
- Timing recovery (Gardener) 6. DDPLL 7. symbol demapping what are the stages to be modified?
Q3. suggest me some papers ?
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