Hello, I am trying to understand the design in benchmark OFDM code in Gnuradio.
In the code, OFDM_RECEIVER use OFDM_SYNC_PN to do the timing and frequency offset synchronization, and then doing FFT_DEMOD to demodulate the signal. After that, SLICER and DEMAPPER in GR_OFDM_FRAME_SINK are used to output it in the message queue. But the questions are: Why there is PLL for carrier compensation in GR_OFDM_FRAME_SINK? Should PLL be used before FFT_DEMOD ? What is the difference between PLL here and timing and frequency synchronization in OFDM_SYNC_PN? -- Regards, Guanbo
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
