GSM Decoding Part Four: Decoding A GSM Capture File With 'grgsm_decode'
Ever since I associated an email address with my YouTube channel back in February of this year, I have been inundated with emails requesting help with decoding GSM data and questions about the usage of gr-gsm.
So in response to this, I thought I would put together a four or five part video tutorial series on how exactly GSM cellular data is decoded in Linux with the gr-gsm software suite.
In the forth installment of this video series, I will be demonstrating how a GSM capture file recorded with a software defined radio can be decoded with the ‘grgsm_decode’ utility and using Wireshark, view the GSM data in a nice human-readable format.
For details on the hardware and software required to do this, please refer to part one. The only additional software tool we need is Wireshark, which can be launched with the following command:
sudo wireshark -k -Y ‘!icmp && gsmtap’ -i lo
Stay tuned for part 5 in the coming days, where I will be showcasing the usage of ‘grgsm_channelize’ and demonstrating it’s ability to contend with wideband capture files recorded from GSM cells with frequency hopping enabled.
Thanks for watching!
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