H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/38 (2006.01)
Patent
CA 2148200
A method and apparatus are provided for recovering and tracking the carrier in a QAM communication system, even under heavy interference conditions. A subset of fixed points is defined on an ideal constellation pattern for comparison to the data points in a received signal. The subset includes all of the points intersected by n radii (e.g., the four diagonals) of the constellation pattern. Additional points along the perimeter of the constellation pattern can also be provided in the subset. Data points received via a carrier are correlated with the fixed points of the subset in order to generate an error signal indicative of a phase difference between the fixed points of the subset and the received data points correlated therewith.
General Instrument Corporation Of Delaware
Ridout & Maybee Llp
Vizio
LandOfFree
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