Patent ID: 7477708
Filing Date: 2009-01-13
Classification: H04L

Abstract:
1. An internal modem controller comprising: a QAM modem; and a controller embedded in said QAM modem; said controller is configured to control said QAM modem according to a control algorithm; wherein a state machine having 10 states is embedded in said QAM modem; said control algorithm comprising the following steps: (A1) using a host interface to select a pair of states “ (B2) causing said state machine to progress from said initial state “ (C) Performing a Blind Equalization of said QAM signal without carrier lock to minimize a dispersion error of said received QAM signal constellation as compared with an error-free QAM signal constellation by adjusting a set of coefficients of said equalizer; (D) Performing a carrier recovery of said QAM signal to eliminate a residual carrier frequency error and to eliminate a phase error from said acquired QAM signal; and (E) Performing a decision directed equalization (DDE) of said QAM signal by updating a set of coefficients of said equalizer by using a decision based algorithm.