# Difference between ofdm\_txrx.py and benchmark ofdm program

**URL:** <https://www.ruby-forum.com/t/difference-between-ofdm-txrx-py-and-benchmark-ofdm-program/240838>\
**Category:** GNU Radio\
**Created:** [May 2, 2014, 4:20pm UTC](https://www.ruby-forum.com/t/difference-between-ofdm-txrx-py-and-benchmark-ofdm-program/240838 "2014-05-02T16:20:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 2, 2014, 4:20pm UTC](https://www.ruby-forum.com/t/difference-between-ofdm-txrx-py-and-benchmark-ofdm-program/240838/1 "2014-05-02T16:20:57Z")

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Hi,  
We are experimenting with ofdm transmission and reception. We are  
using benchmark\_tx.py and benchmark\_rx.py for transmission and reception  
in  
the examples folder of gnuradio (  
_/usr/local/share/gnuradio/examples/digital/ofdm_). We are able to  
transmit  
and receive succesfully. Tracing the benchmark programs that we  
mentioned  
above, we found that it uses the ofdm.py program located at (  
_/usr/local/lib/python2.7/dist-packages/gnuradio/digital_) .

However, we see that there is another implementation of ofdm in  
ofdm\_txrx.py and ofdm\_receiver.py.

What is the difference between the two sets of implementations?

Why is the ofdm\_txrx.py a hierarchial block?