Control algorithm using hysteresis sub-states in QAM modems

摘要

An apparatus for automated acquisition of a QAM signal. The apparatus employs a State machine progressing from an initial State to a final State. The State Machine comprises: (A) an AGC State further comprising a Minimum Sub-State further comprising: Coarse Estimate Sub-State; and an AGC Lock Sub-State further comprising Maximum Sub-State; (B) a Clock 1 State further comprising a Minimum Sub-State, and a Maximum Sub-State; (C) a Clock 2 State further comprising: a Minimum Sub-State; and a Maximum Sub-State; and (D) a Blind State further comprising a Minimum Sub-State; a Threshold Sub-State further comprising a Maximum Sub-State; and a Hysteresis Sub-State.