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Teaching Communication Systems Using The Universal Software Radio Peripheral (Usrp) And Gnu Radio

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Conference

2009 Annual Conference & Exposition

Location

Austin, Texas

Publication Date

June 14, 2009

Start Date

June 14, 2009

End Date

June 17, 2009

ISSN

2153-5965

Conference Session

Project-Based Learning in ECE Education

Tagged Division

Electrical and Computer

Page Count

9

Page Numbers

14.1128.1 - 14.1128.9

Permanent URL

https://peer.asee.org/5126

Download Count

591

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Paper Authors

biography

Joseph Hoffbeck University of Portland

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Joseph P. Hoffbeck is an Associate Professor of Electrical Engineering at the University of Portland. He has B.S.E.E, M.S.E.E., and Ph.D. degrees from Purdue University, West Lafayette, Indiana. He worked with digital cellular telephone systems at Lucent Technologies (formerly AT&T Bell Labs) in Whippany, New Jersey. He is a member of the IEEE and the ASEE, and his technical interests include communication systems, digital signal processing, and remote sensing. His email address is hoffbeck@up.edu.

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Abstract
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Teaching Communication Systems using the Universal Software Radio Peripheral (USRP) and GNU Radio

Abstract

The Universal Software Radio Peripheral (USRP) is a moderately priced hardware board that implements software defined radio systems. It allows a computer to acquire and generate RF signals in a similar way that a sound card allows a computer capture and produce audio signals. The board includes high speed analog-to-digital converters (ADC), high speed digital-to-analog converters (DAC), digital up and down converters, and a universal serial bus (USB) interface. Various daughter boards are available that interface a wide range of radio frequency (RF) signals with the ADC's and DAC's. The USRP is an open source platform, so the schematic and design files are freely available.

In addition, the USRP is compatible with the open source project GNU Radio that has implemented a vast array of algorithms needed to construct analog and digital communication systems (modulation, source coding, error correction, interleaving, filtering, etc.). The low-level algorithms are written in C++ and are controlled by high-level Python programs. The source code for GNU Radio is also freely available.

Together the USRP and GNU Radio form a powerful and flexible platform that allows the user to implement various real-time communication systems simply by writing software. Receivers that operate in real-time can be constructed for such commercial systems as AM and FM radio, TV, WWV time signal, etc. Two-way real-time systems such as ham radio, family services radio, etc. can also be constructed. The USRP and GNU Radio also make an excellent platform for implementing custom and experimental communication systems.

This paper evaluates the USRP board and the GNU Radio software as tools for teaching communication systems courses. The capabilities and limitations of the device and software are discussed, and ideas for laboratory experiments and projects are presented. This approach to teaching communication systems is compared to software-based and hardware-based simulated systems. The evaluation is based on the capabilities and limitations of the USRP and GNU Radio, the author’s experience using some of the proposed projects in a communication systems course using MATLAB (but not the USRP and GNU Radio), and on the author’s experience of implementing some of the projects with the USRP and GNU Radio (but not as part of a course). None of the proposed experiments have yet been incorporated into the author’s communication systems course using the USRP and GNU Radio.

Background

It is often useful to motivate students to learn the mathematical theory of communication systems by showing how the theory applies to real world systems. Some of the possible ways to show this link include using examples or homework problems dealing with real communication systems, using software to simulate communication systems1,2,3, using hardware to perform the

Hoffbeck, J. (2009, June), Teaching Communication Systems Using The Universal Software Radio Peripheral (Usrp) And Gnu Radio Paper presented at 2009 Annual Conference & Exposition, Austin, Texas. https://peer.asee.org/5126

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