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Compensating Pre-Filter for an OFDM Transmitter

  • US 20100226416A1
  • Filed: 09/18/2009
  • Published: 09/09/2010
  • Est. Priority Date: 03/05/2009
  • Status: Active Grant
First Claim
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1. A method of generating a filtered analog transmission signal for transmission to a remote device, wherein the filtered analog transmission signal comprises multiple frequency components, the method comprising:

  • generating a modulated multi-frequency signal stream from digital frequency-domain samples input to a modulator;

    filtering the modulated multi-frequency signal stream using one or more filters to suppress out-of-band spectral components from the filtered analog transmission signal, said one or more filters collectively having a frequency-domain response over the multiple frequency components comprising a first maximum error relative to a desired frequency response; and

    pre-compensating one or more of the digital frequency-domain samples using a pre-compensation unit such that a collective frequency-domain response of the pre-compensation unit and the one or more filters comprises a second maximum error relative to the desired frequency response less than the first maximum error.

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