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ADSL compatible discrete multi-tone apparatus for mitigation of T1 noise

  • US 5,519,731 A
  • Filed: 04/14/1994
  • Issued: 05/21/1996
  • Est. Priority Date: 04/14/1994
  • Status: Expired due to Term
First Claim
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1. A discrete multi-tone transmitter that is suitable for transmitting digital data over a twisted pair communication line on a multiplicity of subcarriers having different frequencies, the transmitter comprising:

  • an encoder for encoding digital information, the encoder being capable of encoding digital information at speeds in excess of six megabits per second;

    a modulator for modulating the encoded digital information onto a multiplicity of subcarriers in a discrete multi-tone signal, each subcarrier corresponding to an associated tone and an associated subchannel, wherein the available subcarriers for the discrete multi-tone encoded signal have a combined bandwidth of at least 1.6 MHz, the modulation being arranged to take into consideration at least detected line quality parameters and a permissible power mask parameter, and wherein the modulation is capable of dynamically updating both the subchannels used and the amount of data transmitted on each subchannel during transmission in order to accommodate real time changes in specific parameters; and

    an adder for appending a cyclic prefix to the discrete multi-tone signal before it is applied to the transmission line.

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