Wireless Computing with Classroom Application

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Wireless Computing with Classroom Application
Digital Communications DK03 NATSRL and
MN/DOT District One

• Marian S. Stachowicz, Joseph
  Peterson, and Matthew
  Webb

LABORATORY FOR INTELLIGENT SYSTEMS
ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT
UNIVERSITY OF MINNESOTA, DULUTH, USA
http//www.d.umn.edu/ece/lis
Zilina, Slovak Republic, November 25, 2003
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Topics

• Introduction
• Wireless Technology
• Mathematica
• Examples
• Presentation Template
• Website
• Conclusion

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Introduction

• Design presentations for 2 classes
• ECE 2111 Linear Systems and Signal Analysis
• ECE 3151 Control Systems
• Design a website to transmit presentations

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Linear Systems and Signal Analysis

• Convolution
• Fourier Series
• Fourier Transform
• Sampling
• Laplace transform
• Z-transform

• Introduction
• LTI Systems
• Time Shifting
• Mathematical Relations
• Complex Numbers
• Modulation

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Control Systems

• Introduction
• Mathematical Models
• State Variable Models
• Blood Pressure Example
• Performance Indices
• Sensitivity

• Complex Numbers
• Stability
• Routh-Hurwitz Stability
• Root Locus Method
• Frequency response
• PID Controller Design

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Wireless Network
Image courtesy of http//www.homenethelp.com
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Wireless Connectivity on the UMD campus

• 71 Wireless Access Points (WAP)
• Mainly Cisco brand equipment
• Aironet 350, 1100, and 1200
• Each WAP costs between 600-900 US
• Each WAP can serve 20-25 users

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Wireless Technology

• 802.11b protocol
• Max speed of 3.5-4.5 Mbps
• Slowed by distance, walls, and encryptions
• Operates in the 2.4GHz range
• Half-duplex protocol, meaning ability to send or
  receive, but not simultaneously

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What is Mathematica?

• According to Stephen Wolfram, the original
  developer of Mathematica
• A numerical and symbolic calculator
• A visualization system for functions and data
• A high-level programming language in which large
  and small programs can be created

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What is Mathematica?

• A modeling and data analysis environment
• A system for representing knowledge in scientific
  and technical fields
• A software platform on which you can run packages
  built for specific applications

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What is Mathematica?

• A way to create interactive documents, mixing
  text, graphics, sound, and formulas
• A control language for external programs and
  processes
• An embedded system called from within other
  programs

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Basic Structure of Mathematica
Packages
Front End
User
Kernel
Packages
Mathematica is divided into two pieces The actual
calculations are done by a computational kernel,
but users interact through a front end
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Available Packages

• Advanced Numerical Methods,
• Control System Professional,
• Digital Image Processing,
• Fuzzy Logic,
• Neural Networks,
• Signal Analysis,
• Structural Mechanics,
• Wavelet Explorer,
• and more

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Introduction to Signals and Systems
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Fourier Series
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Modulation Part 1
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Modulation Part 2
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Modulation Part 3
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Convolution Part 1
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Convolution Part 2
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Convolution Part 3
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Roots
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System Performance
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Root Locus Plot
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Bode Magnitude Plot
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Bode Phase Plot
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Presentation Template1. Definitions

• Each notebook file has a definition and
  description of key points

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Presentation Template2. Examples

• Definitions are followed by examples of the topic
  worked out in Mathematica

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Presentation Template3. Exercises and Proofs

• If applicable notebook files end with exercises
  for the user to do on their own

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Website

• Easy to navigate
• Links to necessary software
• Access during class for anyone with wireless
  capability
• Access after class for anyone
• with an internet connection
• www.d.umn.edu/ece/lis/wireless

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Conclusion

• The topics and ideas covered are important in the
  study of these fundamental courses
• The files will add to the students understanding
  of class material beyond what the book alone is
  capable of

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Conclusion

• The notebook files will provide experience with
  Mathematica, a powerful computational software,
  which will be useful throughout an engineers
  life
• Wireless technology allows access to these
  resources during class for those with the
  hardware available

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References

• Bishop, Robert H. (1997). Modern Control
  Systems Analysis and Design. Menlo Park,
  California Addison Wesley Longman, Inc.
• Dorf, Richard C., Bishop, Robert H. (2001).
  Modern Control Systems, 9th Ed. Upper Saddle
  River, New Jersey Prentice Hall Inc.
• Oppenheim, Alan V., Willsky, Alan S. (1997).
  Signals and Systems, 2nd Ed. Upper Saddle River,
  New Jersey Prentice Hall Inc.
• Wolfram, Stephen. (1999). The Mathematica Book,
  4th Ed. Champaign, Illinois Wolfram Media Inc.

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Questions or Comments?