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 l.jpg

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 l.jpg
Why is it Important to You? Standard

  • Tremendous Growth of Wireless Communications

  • Wireless Metropolitan Area Networks (WMANs)

  • Future Projects in the Industry

www.gettyimages.com


Presentation organization l.jpg
Presentation Organization Standard

  • 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 l.jpg

x Standard(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 l.jpg
What Is Orthogonal Frequency Division Multiplexing (OFDM)? Standard

  • 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 l.jpg
How OFDM works? Standard

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 l.jpg

Channel Standard

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 l.jpg
Transmitter based on the IEEE 802.16d Standard Standard

  • Upcoming Standard for Wireless Metropolitan Area Networks (WMANs)

  • Specifications Used

    • 256 FFT

    • 56 guard carriers

    • 16- QAM

    • Pilots and Guards


Transmitter implementation l.jpg
Transmitter Implementation Standard

  • 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 l.jpg
Testing and Validation Standard

  • 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 l.jpg
Safety Precautions Standard

  • 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 l.jpg
Budget Constraints Standard

  • No Purchases Involved

  • Hardware and Software Provided by Supervisors

  • Time-Consuming

  • Currently testing the design

www.gettyimages.com


Future transmitter implementations l.jpg
Future Transmitter Implementations Standard

  • Conventional Field Programmable Gate Arrays

  • Digital Signal Processors

  • Application Specific Integrated Circuits

www.gettyimages.com


Acknowledgements l.jpg
Acknowledgements Standard

  • Supervisors:

    • Dr. Brian L. Evans

    • Mr. Ian Wong

  • Technical Teacher Assistant:

    • Mr. Youngok Kim


Conclusion l.jpg
Conclusion Standard

Thank You!!

Questions??

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