[PDF] - GNU Radio An introduction By Maryam Taghizadeh Dehkordi 9/9/2007 PDF Document

SLIDE 1

GNU Radio An introduction

GNU Radio

Maryam Taghizadeh Dehkordi

By

9/9/2007

Introduction

What is a GNU Radio?

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

SLIDE 2

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

An open source software toolkit Supports, Linux, Mac OS and Windows

Creating signal processing applications Defining waveforms in software Processing waveforms in software

A hardware platform

A Framework

A hardware platform

USRP, universal software radio peripheral, low cost HW platform for preprocessing

ADC &DAC FPGA USB 2.0 Interface to Host PC

GNU Radio

A framework for building software radio transceivers

9/9/2007

SLIDE 3

Using the GNU radio is cross disciplinary Requiring know-how in the fields of

Computer programming C

Prerequisites

Communications systems Digital signal processing Analog as well as digital hardware

Hardware is also open source Schematics are available

GNU Radio 9/9/2007

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

SLIDE 4

GNU Radio block schematic

GNU Radio 9/9/2007

GNU Radio block schematic in more detail

GNU Radio 9/9/2007

SLIDE 5

The Universal Software Radio Peripheral

The Universal Software Radio Peripheral (USRP) enables engineers to rapidly design and implement powerful, flexible software radio systems.

GNU Radio 9/9/2007

The Universal Software Radio Peripheral

GNU Radio 9/9/2007

SLIDE 6

The Universal Software Radio Peripheral

GNU Radio 9/9/2007

The Universal Software Radio Peripheral

GNU Radio 9/9/2007

SLIDE 7

The Universal Software Radio Peripheral

$75.00

1 MHz to 250 MHz

GNU Radio

$75.00

DC-30 MHz

9/9/2007

The Universal Software Radio Peripheral

GNU Radio 9/9/2007

SLIDE 8

The Universal Software Radio Peripheral

RFX400

Frequency Range: 400

to 500 MHz

Transmit Power:

100mW (20dBm) RFX900

Frequency Range: 750

to 1050 MHz

Transmit Power:

200mW (23dBm) RFX1200 RFX1800

$275.00

GNU Radio

RFX1200

Frequency Range: 1150

to 1450 MHz

Transmit Power:

200mW (23dBm) RFX1800

Frequency Range: 1.5 to

2.1 GHz

Transmit Power:

100mW (20dBm) RFX2400

Frequency Range: 2.3 to

2.9 GHz

Transmit Power: 50mW

(17dBm)

9/9/2007

ADC&DAC frontend, AD9862

GNU Radio 9/9/2007

SLIDE 9

The FPGA

GNU Radio 9/9/2007

The FPGA

GNU Radio 9/9/2007

SLIDE 10

The FPGA

GNU Radio 9/9/2007

The USB interface supports (ideally) 32Mbyte/s this limits the achievable datarates

The USB interface

GNU Radio 9/9/2007

SLIDE 11

The USB interface

GNU Radio 9/9/2007

The USB interface

GNU Radio 9/9/2007

SLIDE 12

Hardware architecture in conclusion

GNU Radio 9/9/2007

The Universal Software Radio Peripheral

Application

Commercial Defense Security Wireless research d

GNU Radio

Radio astronomy Wildlife tracking RFIDs ...

9/9/2007

SLIDE 13

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

A 3 tier architecture

GNU Radio 9/9/2007

SLIDE 14

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

Hello World Example: Dial Tone Output
#!/usr/bin/env python
from gnuradio import gr
from gnuradio import audio
def build_graph ():
sampling_freq = 48000
ampl = 0.1
fg = gr.flow_graph ()
src0 = gr.sig_source_f (sampling_freq gr.GR_SIN_WAVE 350 ampl)

GNU Radio ‘Hello World’ application

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, 0), (dst, 0))
fg.connect ((src1, 0), (dst, 1))
return fg
if __name__ == ’__main__’:
fg = build_graph ()
fg.start ()
raw_input (’Press Enter to quit: ’)
fg.stop ()

GNU Radio 9/9/2007

SLIDE 15

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

Listening to FM radio

GNU Radio 9/9/2007

SLIDE 16

FM receiver block schematic

GNU Radio 9/9/2007

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

SLIDE 17

Software development on GNU Radio

GNU Radio 9/9/2007

Signal processing blocks in C++

GNU Radio 9/9/2007

SLIDE 18

Components needed in writing a C++ block

.h and .cc file for class definition

GNU Radio 9/9/2007

Introduction

What is a GNU Radio

GNU Radio Architecture

Hardware Architecture Software Architecture

Outline

GNU Radio

Programming the GNU Radio

GNU Radio "‘Hello World"’ FM radio Software development

References

9/9/2007

SLIDE 19

References

GNU Radio 9/9/2007