H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/28, 329/3, 3
H04B 7/00 (2006.01) H04L 27/34 (2006.01)
Patent
CA 1199974
- 19 - FRAME SYNCHRONIZATION AND PHASE AMBIGUITY RESOLUTION IN QAM TRANSMISSION SYSTEMS Abstract A technique for maintaining frame synchronization in a QAM system transmitting nondifferentially encoded data is disclosed. In accordance with the present invention, multibit words (FI, FQ) comprising framing bits are formed and inserted into the trasmitter 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.
426435
Kirby Eades Gale Baker
Western Electric Company Incorporated
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