I conducted a research on how to implement a QPSK demodulator. I found out the Quadrature QPSK demodulation technique which seems very straight forward. Here is what i understood from the explanation of the block diagram, and would like to confirm from this platform if my understanding is right. From the block diagram below, I am meant to do the following for a 2048 bits QPSK modulated signal:
- Split the incoming 2048 bits of QPSK modulated signal into the I and Q phase
- Multiply the 1024 bits in the I phase by the recovered carrier
- multiply the other 1024 bits in the Q phase by the 90 shifted recovered carrier
My question is what do I do to this sets of I and Q phase outputs in order to get my demodulated bits ?
Most explanations I have seen just says it passes through a decision maker, but none has gone the extra length to explain what really happens within the decision maker