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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: 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

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  1. 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

  2. Why is it Important to You? • Tremendous Growth of Wireless Communications • Wireless Metropolitan Area Networks (WMANs) • Future Projects in the Industry www.gettyimages.com

  3. Presentation Organization • Introduction • Transmitter Block Diagram • IEEE 802.16d Standards • Transmitter Implementation • Design Testing and Validation • Budget Constraints and Safety Features • Future Recommendations • Conclusion

  4. x(t) t Signals and Modulation • Continuous-time and Discrete-time signals • Modulation : Carrier Amplitude and/or Frequency http://www.ece.utexas.edu/~bevans

  5. 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

  6. 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

  7. Channel Serial Data Source Serial To Parallel Encoding Bank IFFT Parallel To Serial Cyclic Prefix Our Simple Transmitter Block Diagram

  8. 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

  9. 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

  10. 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

  11. Safety Precautions • Fundamental Canon of Engineering: “Hold Paramount Public Health and Safety” • Repeated Design Testing for Functional Verification and Robustness • Additional Indicators for Warnings www.gettyimages.com

  12. Budget Constraints • No Purchases Involved • Hardware and Software Provided by Supervisors • Time-Consuming • Currently testing the design www.gettyimages.com

  13. Future Transmitter Implementations • Conventional Field Programmable Gate Arrays • Digital Signal Processors • Application Specific Integrated Circuits www.gettyimages.com

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

  15. Conclusion Thank You!! Questions?? www.gettyimages.com

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