Use the Fourier transform pairs demodulation based on subband based on the communication system of OFDM of reduction

Use the Fourier transform pairs demodulation based on subband based on the communication system of OFDM of reduction

  • CN 1,947,398 B
  • Filed: 02/04/2005
  • Issued: 06/15/2016
  • Est. Priority Date: 02/09/2004
  • Status: Active Grant
First Claim
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1. the method performing demodulation in the communication system utilize orthogonal frequency division multiplex OFDM, including:

  • The sequence being made up of N number of input sample of OFDM symbol is performed partial Fourier transform, to obtain and by NcConstitute first group of individual subband is corresponding to NcFirst group of individual receiving symbol composition, wherein N >

    Nc>

    1, and wherein, described partial Fourier transform utilizes NcPoint quick Fourier conversion FFT obtains described by NcFirst group of individual receiving symbol composition;

    Obtain described by NcFirst channel gain estimation group of first group of individual subband composition;

    AndDescribed first channel gain estimation group is utilized to process described by NcFirst group of individual receiving symbol composition, described by N to obtaincThe first of first group of individual subband composition recovers group of data symbols,Wherein, described communication system includes whole N number of subband, described by NcN in first group of individual subband compositioncIndividual subband is evenly distributed on described whole N number of subband,And wherein, the step of the described first channel gain estimation group of described acquisition includes;

    Based on the described sequence being made up of N number of input sample, it is thus achieved that multiple domain channel gain of one group of pilot subbands,Rotate the plurality of domain channel gain, described by N to obtaincFirst rotated channel gain values sequence of first group of individual subband composition, andDescribed first rotated channel gain values sequence is performed fast Fourier transform, to obtain described by NcThe described first channel gain estimation group of first group of individual subband composition.

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