[Discuss-gnuradio] integral frequency shift correcting in ofdm_frame_equalizer_vcvc_impl.cc

[Tiankun Hu]

Hi All,
I found "ofdm_frame_equalizer_vcvc_impl.cc" use below code to correct 
integral freq shift(IFO) in freq domain, but as I known, the IFO only 
cause signal cyclic shifting in freq domain, why this block use gr_expj 
to correcting IFO in freq domain? might be blow code should be done in 
time domain.

   // Correct the frequency shift on the symbols
   gr_complex phase_correction;
   for (int i = 0; i < frame_len; i++) {
       phase_correction = gr_expj(-M_TWOPI * carrier_offset * d_cp_len 
/ d_fft_len * (i+1));
       for (int k = 0; k < d_fft_len; k++) {
           out[i*d_fft_len+k] *= phase_correction;
       }
   }


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Thanks
Tiankun