Pulse or digital communications – Repeaters – Testing
Patent
1982-05-26
1985-01-15
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 58, 370 20, H03C 500, H04B 1500
Patent
active
044942397
ABSTRACT:
A technique for maintaining frame synchronization in a OAM system transmitting nondifferentially encoded data is disclosed. In accordance with the present invention, multibit words (F.sub.I, F.sub.Q) comprising framing bits are formed and inserted into the transmitter data channels. The value of the framing bit is insensitive to the rotational effects of phase ambiguity by having a predetermined value and by being inserted within a predetermined bit position in each data channel. In the disclosed embodiments, regeneration errors can also be corrected by the transmission of predetermined quadrant bits within the multibit words. In addition, the spectral tones generated by multibit word transmission can be reduced by the use of utility bits in the multibit words.
REFERENCES:
patent: 3341776 (1967-09-01), Dozlz et al.
patent: 3736507 (1973-05-01), Wolejsza, Jr. et al.
patent: 3955141 (1976-05-01), Lyon et al.
patent: 3988539 (1976-10-01), Motley et al.
patent: 4347616 (1982-08-01), Murakami
Cacciaman et al., IEEE Trans. on Comm. Tech., vol. COM-19, No. 6, Dec. 1971, "Phase Ambiguity Resolution in a Four-Phase PSK Communications System".
AT&T Bell Laboratories
Chin Stephen
Griffin Robert L.
Mullarney John K.
Padnes David R.
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