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Mitigating radio frequency interference in multi-carrier transmission systems

  • US 6,035,000 A
  • Filed: 04/04/1997
  • Issued: 03/07/2000
  • Est. Priority Date: 04/19/1996
  • Status: Expired due to Term
First Claim
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1. In a data transmission system that facilitates communications between a pair of modems using a multi-carrier transmission scheme that has a multiplicity of discrete subchannels within a designated transmission bandwidth, a method of transmitting multi-carrier signals in a manner that reduces the power spectral density of radio frequency emissions in a designated restricted frequency band within the designated transmission bandwidth, the method comprising the steps of:

  • (a) transmitting data signals over a plurality of selected data subchannels within the designated transmission bandwidth; and

    (b) transmitting a dummy tone over a selected dummy subchannel, wherein the magnitude and phase of the dummy tone is chosen to suppress the transmission power in the restricted frequency band due to sidelobe transmissions from at least one of the data subchannels outside of the restricted frequency band.

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