Patent ID: 6249543
Filing Date: 2001-06-19
Classification: H04L

Abstract:
A transceiver for a data transmission system using multicarrier modulation, said transceiver comprising:a bit allocation table, said bit allocation table stores bit allocation information including separate bit allocation information for a plurality of carriers of the multicarrier modulation;a data symbol encoder, said data symbol encoder receives digital data to be transmitted and encodes bits associated with the digital data onto the carriers based on the bit allocation information stored in said bit allocation table;a multicarrier modulation unit, said multicarrier modulation unit modulates the encoded bits on the carriers to produce modulated signals;a digital-to-analog converter, said digital-to-analog converter converts the modulated signals to analog signals; anda controller, said controller performs initialization processing for said transceiver to set the bit allocation information in said bit allocation table, the initialization processing including the operations of: determining channel and noise characteristics for data transmissions to said transceiver from a remotely located transceiver; producing first direction performance information for data transmissions to said transceiver from the remotely located transceiver based on the channel and noise information; receiving second direction performance information from the remotely located transceiver; determining first direction bit allocations and second direction bit allocations, the first direction bit allocations being based on the first direction performance information and the second direction bit allocations being based on the second direction performance information; and thereafter forwarding the first direction bit allocations and the second direction bit allocations from said transceiver to the remotely located transceiver.