implementation of ofdm transmitter based on the ieee 802 16d standard
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Implementation of OFDM Transmitter based on the IEEE 802.16d Standard. Presented by: Altamash Janjua, Umar Chohan Supervisors: Dr. Brian L. Evans and Mr. Ian Wong Technical TA: Mr. Youngok Kim Date: 2 nd December, 2004. Why is it Important to You?.

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implementation of ofdm transmitter based on the ieee 802 16d standard

Implementation of OFDM Transmitter based on the IEEE 802.16d Standard

Presented by:

Altamash Janjua, Umar Chohan

Supervisors:

Dr. Brian L. Evans and Mr. Ian Wong

Technical TA:

Mr. Youngok Kim

Date: 2nd December, 2004

why is it important to you
Why is it Important to You?
  • Tremendous Growth of Wireless Communications
  • Wireless Metropolitan Area Networks (WMANs)
  • Future Projects in the Industry

www.gettyimages.com

presentation organization
Presentation Organization
  • Introduction
  • Transmitter Block Diagram
  • IEEE 802.16d Standards
  • Transmitter Implementation
  • Design Testing and Validation
  • Budget Constraints and Safety Features
  • Future Recommendations
  • Conclusion
signals and modulation

x(t)

t

Signals and Modulation
  • Continuous-time and Discrete-time signals
  • Modulation : Carrier Amplitude and/or Frequency

http://www.ece.utexas.edu/~bevans

what is orthogonal frequency division multiplexing ofdm
What Is Orthogonal Frequency Division Multiplexing (OFDM)?
  • Multi-carrier Amplitude modulationscheme
    • Each Carrier’s amplitude is modulated
  • Well-suited for Wireless Communication

Amplitude

Frequency

www.iec.org/online/ tutorials/ofdm/topic04.html

how ofdm works
How OFDM works?

Parallel Data Streams

Data Encoding is based on Amplitude Modulation

Multiple Carriers are combined through the Fourier Series

Computed by Inverse Fast Fourier transform

4-QAM modulation

our simple transmitter block diagram

Channel

Serial

Data Source

Serial

To Parallel

Encoding Bank

IFFT

Parallel To

Serial

Cyclic

Prefix

Our Simple Transmitter Block Diagram
transmitter based on the ieee 802 16d standard
Transmitter based on the IEEE 802.16d Standard
  • Upcoming Standard for Wireless Metropolitan Area Networks (WMANs)
  • Specifications Used
    • 256 FFT
    • 56 guard carriers
    • 16- QAM
    • Pilots and Guards
transmitter implementation
Transmitter Implementation
  • National Instruments Lab VIEW FPGA
  • VHDL and Lab VIEW programming
  • One Main Virtual Instrument (VI)
    • 16-QAM Encoding Bank
    • 256 point Complex IFFT core developed by Xilinx Inc.
    • Cyclic Prefix Module
testing and validation
Testing and Validation
  • Individual Modules Tested through Software Simulations
  • Developing a Host PC VI for the Testing of final Hardware
  • Sample test results provided in the IEEE 802.16d Standard
safety precautions
Safety Precautions
  • Fundamental Canon of Engineering:

“Hold Paramount Public Health and Safety”

  • Repeated Design Testing for Functional Verification and Robustness
  • Additional Indicators for Warnings

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budget constraints
Budget Constraints
  • No Purchases Involved
  • Hardware and Software Provided by Supervisors
  • Time-Consuming
  • Currently testing the design

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future transmitter implementations
Future Transmitter Implementations
  • Conventional Field Programmable Gate Arrays
  • Digital Signal Processors
  • Application Specific Integrated Circuits

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acknowledgements
Acknowledgements
  • Supervisors:
    • Dr. Brian L. Evans
    • Mr. Ian Wong
  • Technical Teacher Assistant:
    • Mr. Youngok Kim
conclusion
Conclusion

Thank You!!

Questions??

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