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FFT configuration for LTE uplink

Aswathy Raj
Prodigy 210 points

hi,

We are testing the FFT hardware accelerator  for LTE uplink (10Mhz, 1024 fft size).  Half subcarrier shift is included using the LTE shift. The parameters chosen are listed below.

    pFFTTestCfg->fftcQCfg.freqShiftRegConfig.bFreqShiftEnable               =   1;
    pFFTTestCfg->fftcQCfg.scalingShiftingRegConfig.freqShiftScaleVal    =   0;
 
        pFFTTestCfg->fftcQCfg.freqShiftRegConfig.freqShiftIndex         =   Fftc_FreqShiftIndex_16384;
  
    pFFTTestCfg->fftcQCfg.freqShiftRegConfig.freqShiftMultFactor        =   8;
    pFFTTestCfg->fftcQCfg.freqShiftRegConfig.freqShiftInitPhase         =   0;
    pFFTTestCfg->fftcQCfg.freqShiftRegConfig.freqShiftDirection         =   Fftc_FreqShiftDir_MINUS;

the output is not matching with the MATLAB one. We tried both static and dynamic scaling. anything else to be done?? what can be the input range??

thanks and regards,

Aswathy