Carrier phase advance technique for digital PGC demodulation

Carrier phase delay resulted in output signal fading in the Phase Generated Carrier (PGC) demodulation, and in critical conditions, the output signal vanished. A carrier phase advance technique was developed to solve this problem. The digital carrier waveform was generated using cosine waveform Look-up-table (LUT). in the digital PGC demodulation system. An address offset was introduced at the LUT input port and a phase-advanced carrier was generated. The phase advance completely compensated the constant delay in the demodulation system. The address offset could be obtained from both analysis and measurement of the demodulation system. Experiment result verifies that the carrier phase advance technique is effective.