Difference between revisions of "Implementation of a Simple FM Receiver in GNU Radio"

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AN-5501
 
AN-5501
  
===Title==
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===Title===
 
Implementation of a Simple FM Receiver in GNU Radio
 
Implementation of a Simple FM Receiver in GNU Radio
  

Revision as of 12:26, 1 May 2016

Introduction

Application Note Number

AN-5501

Title

Implementation of a Simple FM Receiver in GNU Radio

Authors

John Smith and Jane Smith

Organization

Ettus Research

Last Modified Date

2016/04/15

Revision History

2016-05-01 Neel Pandeya Initial creation

Reference

https://www.ettus.com/kb/detail/sdr-for-beginners-building-an-fm-receiver-with-the-usrp-and-gnu-radio

Overview

In this application note, a Universal Software Radio Peripheral (USRP™) N200/N210 and a WBX daughterboard is used with GNU Radio to build a simple FM receiver. The intent of this example is to:

  • Teach some basic DSP and RF concepts including: filtering, demodulation, and sample rate conversion.
  • Show how to build graphical applications with GNU Radio Companion
  • Illustrate the simplicity of the software tools that can be used with the USRP product family.

Requirements

  • USRP with compatible daughterboard to receive 88-108 MHz
  • GNU Radio
  • UHD

Blocks

UHD Source Block

  • Configures USRP
  • Receives data stream from USRP

FFT Sink

  • Display Fast Fourier Transform of data stream

Low Pass Filter

  • Apply low pass filter to data stream
  • Optional: Decimation or Interpolation

WBFM Receive

  • Demodulates Wide Band Frequency Modulated signal from data stream

Rational Resampler

  • Decimate or Interpolate data stream to desired sample rate

Audio Sink

  • Audio hardware interface
  • Optional: Decimate Audio Rate

Wav File Sink

  • Save data stream as WAV file type

WX Widgets

  • Textbox - Input field
  • Slider - Adjustable slider
  • Notebook - Assign Widgets/GUI Sinks to tabs within flowgraph

Variable

  • Creates variable within flowgraph

Video

https://www.youtube.com/watch?v=KWeY2yqwVA0

You can download the sample GRC file here: http://files.ettus.com/app_notes/fm_rcvr/fm_example.grc