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

2. Project Design Review Contents  Project Summary  Functional Description  Transmitter/Receiver Block Diagrams  Hardware/Software  Preliminary Results  Original Work Schedule  Work Completed  Revised Work Schedule  Questions?

3. The purpose of this project is the development of a Quadrature Amplitude Modulation (QAM) signal communication system in order to test synchronization methods of digital communication systems.

4. Functional Description

5.  Inputs TransmitterTransmitter  Signals from a function generator  Stored Data ReceiverReceiver  QAM signal  Stored Data

6. Functional Description  Outputs TransmitterTransmitter  QAM signal ReceiverReceiver  Recovered Data  Matlab/Simulink Data Acquisition

7. Functional Description  Modes of Operation Transmitter – Real Time Modulation Receiver – Real Time Demodulation

8. Transmitter Block Diagram

9. Transmitter Block Diagram Transmitter Block Diagram

10. Transmitter Block Diagram

11.  Adaptable for stored data inputs  Differential Coding  Possibility of M-Level QAM

12. Receiver Block Diagram

13. Hardware/Software  TI c6713 DSP 8 KHz, 32 KHz, 44.1 KHz, 48 KHz, and 96 KHz8 KHz, 32 KHz, 44.1 KHz, 48 KHz, and 96 KHz  Matlab/Simulink  Code Composer Studio

14. Preliminary Results  QAM Simulink Development 4-QAM Transmit/Receive4-QAM Transmit/Receive  DSP interfacing/testing Digital filteringDigital filtering  Analog source  Data Source

15. Original Schedule PracticalTheoretical 12/1/2005Proposal PresentationProposal Presentation Winter BreakWork on WebsiteWork on Phase distortion 1/24/2006Fully Develop DSP I/O correction 1/31/2006w/ Matlab/Simulink 1/31/2006w/ Matlab/Simulink 2/7/2006Begin Documentation 2/7/2006Begin Documentation 2/14/2006Test/gather data ofFinalize 4-QAM 2/21/2006implemented 4-QAM 2/21/2006implemented 4-QAM 2/28/2006Documentation/TutorialFinish up any remaining 3/7/2006Workphase distortion problems 3/21/20068-QAM testing/data 3/21/20068-QAM testing/data 3/28/2006gatheringBegin work on 8-QAM 4/4/2006Documentation/Tutorialand 16-QAM 4/11/200616-QAM testing 4/11/200616-QAM testing 4/18/2006DocumentationDocumentation 4/25/2006PresentationPresentation 5/2/2006

16. Tasks Completed  RTDX Testing  Phase Tracking using Phase Lock Loop

17. RTDX Testing  Success Using m-files  Unable to succeed using block diagram modeling

18. RTDX Testing (m-file)  M-file has RTDX input channel and output channel  Increments the values of an array passed into the input channel  Program then reads the output channel  Literally runs on DSP

19. RTDX Testing (m-file)  [1 2 3 4 5]

20. RTDX Testing (m-file)

21. RTDX Testing (Block Diagram)

23. PLL Subsystems  Phase Detector (PD)  Loop Filter (LF)  Oscillator [1]Voltage Controlled (VCO) [1]Voltage Controlled (VCO) [2]Direct Digital Synthesizer (DDS) [2]Direct Digital Synthesizer (DDS)

24. PD Implementation

25. PD models Inverse tangent model “Cross product terms” (CPT) model

26. Comparison Atan2 PD CPT PD

27. Loop Filter

28. Design equations for LF

29. LF  Loop filter is PI integrator  Why?  y(n) = y(n-1) + k1*x(n) + k2*x(n-1)

30. DDS

31. DDS Simulation Frequency = 40 Hz

32. Complete model

33. Model on 6713

34. Simulation parameters and specs  Input frequency = 42 Hz  LF natural frequency = 5 Hz  DDS running frequency = 40 Hz  Fs = 8000 Hz

35. Simulation results

36. Laboratory results

37. Phase error

38. Filter output at 41 Hz

39. What’s Left  Differential Coding  2-D Slicer  Automatic Gain Control  Symbol Timing  RTDX or Comparative Method

40. Revised Project Schedule Bader Al-KandariJosh Mason 3/7/2006Fully Debug PLL + DocumentRTDX + Document BreakResearch Symbol TimingResearch Diff Coding 3/21/2006Symbol TimingDifferential Coding 3/28/2006Symbol TimingDifferential Coding 4/4/20062-D SlicerDiffCoding/Prepare for Student EXPO 4/11/20062-D SlicerData Preparations 4/18/2006Automatic Gain Control 4/25/2006Documentation 5/2/2006Presentation

41. Questions? != 45

42. Inverse tan PD

43. Atan2 simulation results

44. Lab results