GNU Radio Wireless protocol analyses approach Alex Verduin July 2, - - PowerPoint PPT Presentation

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Apr 07, 2024 195 likes •435 views

GNU Radio Wireless protocol analyses approach Alex Verduin July 2, 2008 System and Network Engineering 1 / 22 Index Research question What is Software Defined Radio Hardware Software What is Radio Data System Approach

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GNU Radio

Wireless protocol analyses approach Alex Verduin July 2, 2008 System and Network Engineering

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SLIDE 2

Index

◮ Research question ◮ What is Software Defined Radio

◮ Hardware ◮ Software

◮ What is Radio Data System ◮ Approach ◮ Flowgraph of the RDS protocol ◮ Demo ◮ Conclusion and future work ◮ Questions

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SLIDE 3

Research question

How can a system and network engineer use the USPR and GNU Radio to fulfill a wireless protocol analyses?

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SLIDE 4

SDR explained

Figure: Design principles of SDR

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SLIDE 5

My setup

Figure: My setup

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Universal Software Radio Peripheral(USPR)

Figure: USRP

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GNU Radio Software architecture

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GNU Radio Software architecture

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GNU Radio Software architecture

Figure: GNU Radio Comagnion

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SLIDE 10

GNU Radio Software architecture

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GNU Radio Software architecture

#!/usr/bin/env python from gnuradio import gr from gnuradio import audio sampling_freq = 48000 ampl = 0.1 fg = gr.top_block () src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 350, ampl) src1 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 440, ampl) dst = audio.sink (sampling_freq) fg.connect (src0, (dst, 0)) fg.connect (src1, (dst, 1)) fg.start ()

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GNU Radio Software architecture

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GNU Radio Software architecture

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Radio Data System (RDS)

Figure: RDS logo Figure: RDS example

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Approach

◮ Understand the design of the USPR and GNU Radio ◮ Install and try code examples ◮ Study protocol specifications and search for existing GNU

Radio code

◮ Create flow graph ◮ Create testbed ◮ Capture raw samples ◮ Analyse the protocol

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RDS Flow graph 1/3

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RDS Flow graph 2/3

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RDS Flow graph 3/3

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Demo

Lets do some demoing!!

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SLIDE 20

Demo

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Conclusion and future work

Conclusions:

◮ The defined approach works. ◮ Writing code, easy with Python, even more with GRC,

difficult in C++

◮ The SNE’er needs some radio and SDR knowledge. ◮ Not all protocols can be fully analysed.

Future work:

◮ Analyse more protocols ◮ Extend the research with transmitting

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SLIDE 22

Questions

Questions:

◮ ......?

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