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Synchronization in Digital Communication

Synchronization in Digital Communication

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Synchronization in Digital Communication

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  1. Synchronization in Digital Communication By: Bader Al-Kandari and Josh Mason Advisors: Dr. Thomas L. Stewart, Dr. In Soo Ahn

  2. The purpose of this project is the development of a Quadrature Amplitude Modulation (QAM) signal communication system. MATLAB/Simulink simulation environment, Code Composer Studio Software (CCS) and two TI DSP boards are used to develop and to implement the design.

  3. Project Proposal Contents • QAM Overview • Functional Description • Transmitter/Receiver Block Diagrams • Equipment/Standards/Patents • Preliminary Results • Schedule of Remaining Work • Questions?

  4. QAM Overview • Quadrature Amplitude Modulation • Sine (Quadrature) and Cosine (In-Phase) Carriers • 2-D plane with In-phase and Quadrature Axis

  5. QAM Overview • 4-QAM Data Constellation

  6. QAM Overview • Higher order QAM - 16-QAM

  7. Functional Description

  8. Functional Description • Inputs • Transmitter • Signals from a function generator • Stored Data • Receiver • QAM signal • Stored Data

  9. Functional Description • Outputs • Transmitter • QAM signal • Receiver • Recovered Data • Matlab/Simulink Data Acquisition

  10. Functional Description • Modes of Operation Transmitter – Real Time Modulation Receiver – Real Time Demodulation

  11. Transmitter Block Diagram

  12. Transmitter Block Diagram • Filters lower bandwidth requirements • Digital Carriers – Sampling effect • Adaptable for stored data inputs

  13. Receiver Block Diagram

  14. Receiver Block Diagram • Phase Distortion • Channel • 90 degree distortion = data error every time • Digital Carrier – Sampling effects • Independent of channel distortion 0.5 * X *[ cos(Wc – Wl)*t + cos(Wc + Wl)*t] + 0.5 * Y *[ sin(Wc – Wl)*t + sin(Wc + Wl)*t]

  15. Equipment • Spectrum Digital TMS320C6713 DSK • Agilent 33220A Function Generator • Tektronix TDS 3012B 100MHz Oscilloscope

  16. Software • Matlab/Simulink • Data Generation • Simulation • System Design • Code Composer Studio • DSP Code Creation • DSP Interfacing

  17. TMS320C6713 DSK • TI c6713 DSP • 225 MHz • USB interface • AIC23 Audio Codec package • 8 KHz, 32 KHz, 44.1 KHz, 48 KHz, and 96 KHz • four 3.5 mm stereo audio jacks

  18. Patents/Standards • Many patents • Analog, DSP, FPGA • No Specific Standards • ANSI/SCTE 07 2000 • 64-QAM, 256-QAM Digital Cable • IEEE 802.11b • PSK Wireless Networking

  19. Preliminary Results • QAM Simulink Development • 4-QAM Transmit/Receive • DSP interfacing/testing • Digital filtering • Analog source • Data Source

  20. 4-QAM Simulink Testing • Simple Transmitter

  21. 4-QAM Simulink Testing

  22. 4-QAM Simulink Testing

  23. 4-QAM Simulink Testing

  24. 4-QAM Simulink Testing

  25. DSP Filter Test • FIR Filter • Fpass 8 KHz • Fstop 16 KHz • 8 KHz Square Wave Input • 44.1 KHz Sampling Rate

  26. DSP Filter Test

  27. DSP Filter Test

  28. Schedule of Remaining Work Practical Theoretical 12/1/2005 Proposal Presentation Proposal Presentation Winter Break Work on Website Work on Phase distortion 1/24/2006 Fully Develop DSP I/O correction 1/31/2006 w/ Matlab/Simulink  2/7/2006 Begin Documentation  2/14/2006 Test/gather data of Finalize 4-QAM 2/21/2006 implemented 4-QAM  2/28/2006 Documentation/Tutorial Finish up any remaining 3/7/2006 Work phase distortion problems 3/21/2006 8-QAM testing/data   3/28/2006 gathering Begin work on 8-QAM 4/4/2006 Documentation/Tutorial and 16-QAM 4/11/2006 16-QAM testing  4/18/2006 Documentation Documentation 4/25/2006 Presentation Presentation 5/2/2006  

  29. Questions?