[Discuss-gnuradio] Question about ofdm_sync_long block of gr-ieee802-11 module

[Jeon]

I am looking gr-ieee802-11 module.

a part of the source code is pasted here (https://gist.github.com/gsongsong/3df4553fe96e2d62b83e)

I have a question on the following statement:

`if(rel >= 0 && (rel < 128 || ((rel - 128) % 80) > 15))`  in `case COPY`

`if(((d_count + o) % 64) == 0)` in `case RESET`

I am wonder what do these numbers(128, 80, 15, 64) and modulo operation have logical meaning in IEEE 802.11p PHY frame?

I've read 802.11 OFDM specification, thus I have knowledge about it,
but I have no idea what are roles of these things in implementation.

Regards,

Jeon.