Reduction of interference in discrete multi-tone (DMT) based communications systems
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United States of America Patent
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Feb 11, 2003
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app pub date -
Feb 3, 1998
filing date -
Feb 3, 1998
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Abstract
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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