I am a beginner who is learning about DVB-T. I noticed a difference in the examples provided by the official source and I am confused about it.

This is dvbt_tx_8k enter image description here

This is dvbt_rx_8k enter image description here

What is the principle behind doing it this way?Thanks a lot!

EDIT 1: Sorry, my previous description of the problem was not detailed enough. In my opinion, there should be a IFFT block before OFDM Cyclic Prefixes block in dvbt_tx_8k.grc, which corresponds to FFT block behind OFDM Symbol Acquisition block in dvbt_rx_8k.grc, in order to achieve correct demodulation. However, in fact, signal transmission can only be successful when there is no FFT block in dvbt_tx_8k.grc. Otherwise, errors will occur, which confuses me.

Both files(dvbt_tx_8k.grc and dvbt_rx_8k.grc) can be found at


  • $\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$
    – ZaellixA
    Mar 24 at 9:28


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