# Problem receiving packetized data with QPSK and higher modulations using benchmark\_rx.py

**URL:** <https://www.ruby-forum.com/t/problem-receiving-packetized-data-with-qpsk-and-higher-modulations-using-benchmark-rx-py/244987>\
**Category:** GNU Radio\
**Created:** [July 25, 2016, 6:01pm UTC](https://www.ruby-forum.com/t/problem-receiving-packetized-data-with-qpsk-and-higher-modulations-using-benchmark-rx-py/244987 "2016-07-25T18:01:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [July 25, 2016, 6:01pm UTC](https://www.ruby-forum.com/t/problem-receiving-packetized-data-with-qpsk-and-higher-modulations-using-benchmark-rx-py/244987/1 "2016-07-25T18:01:37Z")

</div>

Hello all,

I am having a problem receiving packetized data with the benchmark\_rx.py  
file. For reference I am not using the benchmark\_tx.py file, I created  
my own transmit file in which transmits packetized data. When the  
modulation BPSK is transmitted, it is received with the benchmark\_rx.py  
file with 100% success rate, although when I try to use any higher class  
modulation, QPSK, 8PSK and so on, no packets are shown to be received. I  
am using two X300’s with the newest version of GNU radio. I have tried  
my best to trace through the benchmark\_tx.py and associated files to  
find what happens to the modulations to get them packetized, but to no  
success. I will continue my search. Attached I have my transmit file in  
which I have successfully transmitted and received packets using the  
benchmark\_rx.py as the receive file.

Regards,  
Brendan Sheaffer