Pulse or digital communications – Repeaters – Testing
Patent
1992-05-15
1994-05-24
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
348475, H04L 512, H04L 2302
Patent
active
053156196
ABSTRACT:
A television receiver responds to a quadrature amplitude modulated (QAM) signal containing symbols mapped into a four quadrant grid-like constellation defined by I and Q axes. Demodulated I and Q components are processed by a carrier recovery network which adjusts the parameters of a locally generated carrier reference signal so as to maintain a desired orientation of the QAM constellation. The carrier recovery network includes a time multiplexed processor, including a signal multiplier, exhibiting plural operating modes in a digital phase locked loop exhibiting a loop delay of one symbol period.
REFERENCES:
patent: 5113142 (1992-05-01), Yoshikawa
patent: 5148272 (1992-09-01), Acampora et al.
Jablon, Neil K. "Joint Blind Equalization, Carrier Recovery, and Timing Recovery for High-Order QAM Signal Constellations," IEEE Trans. on Signal Processing, vol. 40, No. 6 Jun. 1992 pp. 1383-1398.
Cupo; Robert L. and Gitlin, Richard D. "Adaptive Carrier Recovery Systems for Digital Data Communications Systems" IEEE Journal on Sel. Areas in Communications, vol. 7, No. 9, Dec. 1989, pp. 1328-1339.
Lee et al., "Digital Communication", Kluwer Academic Press, Boston, Mass., 1988, pp. 553-554.
Chin Stephen
Herrmann Eric P.
Kurdyla Ronald H.
RCA Thomson Licensing Corporation
Tripoli Joseph S.
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