NASA NTRS · 19920047185
Multi-mode modem/codec designs
Abstract
The design of an integrated modem/codec unit which can receive coded and uncoded BPSK an QPSK using de facto standard coding schemes as well as 8PSK-TCM and 16PSK-TCM is examined. The design is totally compatible with today's modulation schemes and capable of processing tomorrow's TCM codes. This is accomplished in the modem by using quadrature channel carrier recovery processing and a version of the MAP phase detector algorithm. The symbol synchronization is accomplished with a derivative of an early-late gate designed to accommodate multilevel signals.
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Osborne, William, Carden, Frank, Kopp, Brian, Ross, Mike. 1992-01-01. Multi-mode modem/codec designs. https://ntrs.nasa.gov/citations/19920047185
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