Solved For the QPSK demodulator shown in Figure 21

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Modulator and Demodulator Solutions for Real-Time Communication Toward 100 Gb/s

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Six‐port QPSK demodulator for optimal K‐band multiport amplifier calibration - Lee - 2014 - Electronics Letters - Wiley Online Library

Modulator and Demodulator Solutions for Real-Time Communication Toward 100 Gb/s

Retrieving the Carrier Frequency of Phase-Modulated or Carrier-Suppressed Signals with Costas Loops

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Figure 21 from Implementation of a QPSK system on FPGA

Modulator and Demodulator Solutions for Real-Time Communication Toward 100 Gb/s