Reduction of interference in discrete multi-tone (dmt) based...

Details Reduction of interference in discrete multi-tone (dmt) based... Reduction of interference in discrete multi-tone (dmt) based...

H - Electricity

04

J

H04J 11/00 (2006.01) H04J 1/00 (2006.01) H04L 5/02 (2006.01) H04L 5/14 (2006.01)

Patent

CA 2258412

An Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone system has disjoint and adjacent upstream and downstream channels. During the training phase of an ADSL connection, an ADSL DMT transmitter first determines a round trip propagation delay by transmitting a ranging signal to a far-end ADSL endpoint. During the subsequent communications phase, the ADSL transmitter synchronizes transmission of DMT symbols to a reference clock. In addition, the cyclic extensions of each DMT symbol are increased as a function of the propagation delay.

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