Sorry, but It seems like you did not transmit ever, as I look in .grc files. 
As such, none of them send OFDM blocks...
For example in ofdm_rx.  you have a chain of operations, good and working. 
However there is nothing like that in the transmitter side. 
May be I make a mistake but I could not find anything which does the 
transmission which one could receiver back.

>
>>
>> I try gr-digital/examples/ofdm$ sudo ./benchmark_tx.py, and works, but
>> ofdm_tx one fails.
>>
>> May be I did not get correctly what you mean with 'pushing with
>> parameters '.
>> Do you set parameters inside the flow graphs?
>
>I pushed the code to the repository at github.com with gains, 
>frequencies and stuff so that it works without adjusting anything in the 
>GUI. If you want to try it you have to update your repo.


-- 
NE
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