Patent ID: 6201830
Filing Date: 2001-03-13
Classification: H04L

Abstract:
A method for reducing computational requirements in digital data communications between digital subscriber line (DSL) transmitter and receiver modems, comprising:during transmitter modem active periods, generating data frames with valid status through multi-tone modulation of a bit stream containing information to be transmitted to the receiver modem;during transmitter modem idle periods, generating data frames with idle status through generation of pseudo-noise (PN);modulating a pilot tone to indicate difference in status between the valid or idle status of the data frames;transmitting valid or idle status data frames together with the modulated pilot tone from the transmitter modem to the receiver modem;detecting the valid or idle status of data frames from the received pilot tone;if the detected data frame status is valid, recovering the information through computational steps for demodulation of data frames; andif the detected data frame status is idle, skipping at least some of the computational steps.