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Apparatus and method for multicarrier modulation and demodulation

  • US 20040037366A1
  • Filed: 08/23/2002
  • Published: 02/26/2004
  • Est. Priority Date: 08/23/2002
  • Status: Abandoned Application
First Claim
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1. A method for multicarrier signal modulation, comprising the steps of:

  • maintaining substantially identical gain and group delays between transmit in-phase (I) and transmit quadrature-phase (Q) paths, comprising;

    receiving a transmit I digital baseband signal and a transmit Q digital baseband signal of a first multicarrier communication signal;

    digitally constructing a digital transmit intermediate frequency (IF) signal from the transmit I and Q digital baseband signals including bandpass sampling, wherein bin-by-bin amplitude and delay resulting in the I path is substantially equal to bin-by-bin amplitude and delay resulting in the Q path; and

    converting the digital transmit IF signal to an analog transmit IF signal.

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