ADSL MODEM APPARATUS, ADSL COMMUNICATION APPARATUS, AND SYNCHRONIZATION ADJUSTMENT METHOD FOR ADSL COMMUNICATION

摘要

PROBLEM TO BE SOLVED: To provide an ADSL MODEM apparatus, ADSL communication apparatus, and synchronization adjustment method for ADSL communication that prevent an abnormal shutdown caused from losing the hyperframe breakpoint by establishing reception symbol synchronization upon receiving a C-PILOT signal without waiting for a C-REVERSE signal.

SOLUTION: The ADSL communication apparatus 2 includes: a transceiver 11 that performs an initialization sequence, a host 12 that is connected to a user terminal 3; an AFE (Analog Front End) unit 13, a driver 15 that transmits an analog signal converted by the AFE unit 13 to a line; and a receiver 17 that receives the analog signal from the line. The transceiver 11 retrieves a signal component of a known carrier from the front-end of a hyperframe, based on an arbitrary symbol breakpoint. By calculating outer product values between the previously retrieved signal component and the currently retrieved signal component, the symbol breakpoint is adjusted in accordance with the incident patterns of the outer product values through a function provided to the transceiver 11.

COPYRIGHT: (C)2004,JPO