# OFDM\_Transmission\_reception

**URL:** <https://www.ruby-forum.com/t/ofdm-transmission-reception/234265>\
**Category:** GNU Radio\
**Created:** [February 19, 2015, 3:19pm UTC](https://www.ruby-forum.com/t/ofdm-transmission-reception/234265 "2015-02-19T15:19:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [February 19, 2015, 3:19pm UTC](https://www.ruby-forum.com/t/ofdm-transmission-reception/234265/1 "2015-02-19T15:19:54Z")

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Hello,  
I am beginner in gnuradio,My professor gave to me the attached code for  
an OFDM transmission between two USRP but I have not understood the role  
of generate block headers and Repack bit.  
Please what is the role of these blocks for OFDM transmission?

Thank you in advance for your answers