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

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synchronization in digital communication

Synchronization in Digital Communication

By: Bader Al-Kandari and Josh Mason

Advisors: Dr. Thomas L. Stewart, Dr. In Soo Ahn

slide2
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.
project proposal contents
Project Proposal Contents
  • QAM Overview
  • Functional Description
  • Transmitter/Receiver Block Diagrams
  • Equipment/Standards/Patents
  • Preliminary Results
  • Schedule of Remaining Work
  • Questions?
qam overview
QAM Overview
  • Quadrature Amplitude Modulation
  • Sine (Quadrature) and Cosine (In-Phase) Carriers
  • 2-D plane with In-phase and Quadrature Axis
qam overview5
QAM Overview
  • 4-QAM Data Constellation
qam overview6
QAM Overview
  • Higher order QAM - 16-QAM
functional description8
Functional Description
  • Inputs
    • Transmitter
      • Signals from a function generator
      • Stored Data
    • Receiver
      • QAM signal
      • Stored Data
functional description9
Functional Description
  • Outputs
    • Transmitter
      • QAM signal
    • Receiver
      • Recovered Data
  • Matlab/Simulink Data Acquisition
functional description10
Functional Description
  • Modes of Operation

Transmitter – Real Time Modulation

Receiver – Real Time Demodulation

transmitter block diagram12
Transmitter Block Diagram
  • Filters lower bandwidth requirements
  • Digital Carriers – Sampling effect
  • Adaptable for stored data inputs
receiver block diagram14
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]

equipment
Equipment
  • Spectrum Digital TMS320C6713 DSK
  • Agilent 33220A Function Generator
  • Tektronix TDS 3012B 100MHz Oscilloscope
software
Software
  • Matlab/Simulink
    • Data Generation
    • Simulation
    • System Design
  • Code Composer Studio
    • DSP Code Creation
    • DSP Interfacing
tms320c6713 dsk
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
patents standards
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
preliminary results
Preliminary Results
  • QAM Simulink Development
    • 4-QAM Transmit/Receive
  • DSP interfacing/testing
    • Digital filtering
      • Analog source
      • Data Source
4 qam simulink testing
4-QAM Simulink Testing
  • Simple Transmitter
dsp filter test
DSP Filter Test
  • FIR Filter
    • Fpass 8 KHz
    • Fstop 16 KHz
  • 8 KHz Square Wave Input
  • 44.1 KHz Sampling Rate
schedule of remaining work
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