Automatic constellation phase recovery in blind start-up of...

Details Automatic constellation phase recovery in blind start-up of... Automatic constellation phase recovery in blind start-up of...

H - Electricity

04

L

H04L 27/32 (2006.01) H04L 25/03 (2006.01) H04L 25/49 (2006.01) H04L 27/01 (2006.01) H04L 27/38 (2006.01)

Patent

CA 2272234

A dual-mode receiver uses a hybrid cost function that provides for automatic constellation phase recovery regardless of whether a CAP signal or a QAM signal has been transmitted. In one embodiment, the receiver uses a hybrid cost function that is the superposition of a QAM-based cost function and a CAP-based cost function. In another embodiment, the receiver comprises an adaptive filter that alternates between a QAM-based cost function and a CAP-based cost function. In addition, a method is described that uses information about (a) the expected constellations, and (b) the values before and after a rotator of the receiver for deciding what type of signal is being received.

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