Multi-carrier LAN adapter device using frequency domain equalizer

摘要

A LAN Adapter device having a frequency domain equalizer. The LAN adapter device allows LAN computing devices to connect to the LAN medium. The adapter devices are internal or external to the LAN devices and provide a transceiver and protocol stacks for the LAN devices to communicate with each other. The physical layer of the transceivers includes transmitter having a DMT modulator and demodulator that is dynamically configurable with respect to data rate and spectrum usage. Within the receiver is an equalizer for equalizing the received signal with a simple yet effective equalizer training method, thereby obviating the need for extensive equalizer training and long-term coefficient storage. The equalizer trains on known symbols transmitted in one frame of a transmitted packet to determine an estimate of the channel response. The remaining frames that are modulated with data are equalized based on an estimate of the channel response determined from interpolating between the points previously determined from the known symbols.