SYSTEM AND TRANSCEIVER FOR DSL COMMUNICATIONS BASED ON SINGLE CARRIER MODULATION, WITH EFFICIENT VECTORING, CAPACITY APPROACHING CHANNEL CODING STRUCTURE AND PREAMBLE INSERTION FOR AGILE CHANNEL ADAPTATION

摘要

A system for Digital Subscriber Line (DSL) data communications, and therefore the transceiver that contains the transmitter and the receiver implementing such system, based on Single Carrier Modulation (SCM). The invention includes an efficient vectoring structure that provides novel solution for crosstalk (505 and 506) elimination in SCM systems, which allows the cooperative operation at the transmitter (511) side as well as at the receiver (512) side.;The present invention also includes a preamble insertion in a specific location of the transmission path, which makes possible the synchronization, direct channel response (503 and 504) estimation, crosstalk channel responses estimation and noise (507 and 508) estimation in agile manner, to make a continuous tracking of the changes of the channel (503 to 506) and the noise environment (505 to 508). It allows operation with low noise margin.;For approaching the capacity of the channel the present invention also defines the blocks that compose the forward error correction and their corresponding location to operate near to the channel capacity limit.