NASA NTRS · 19770017387
Unbalanced quadriphase demodulator
Abstract
A new and improved apparatus and method are described for demodulation of quaternary phase shift keyed (QPSK) data, particularly unbalanced QPSK. Phase adjustment of the output of a phase locked loop local oscillator is performed to reduce sensitivity to amplitude variations internal to the demodulator.
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Koybayashi, H. S., Bradfield, S. P., III. 1977-05-31. Unbalanced quadriphase demodulator. https://ntrs.nasa.gov/citations/19770017387
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