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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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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.
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Project Proposal Contents QAM Overview Functional Description Transmitter/Receiver Block Diagrams Equipment/Standards/Patents Preliminary Results Schedule of Remaining Work Questions?
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QAM Overview Quadrature Amplitude Modulation Sine (Quadrature) and Cosine (In- Phase) Carriers 2-D plane with In-phase and Quadrature Axis
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QAM Overview 4-QAM Data Constellation
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QAM Overview Higher order QAM - 16-QAM
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Functional Description
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Inputs TransmitterTransmitter Signals from a function generator Stored Data ReceiverReceiver QAM signal Stored Data
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Functional Description Outputs TransmitterTransmitter QAM signal ReceiverReceiver Recovered Data Matlab/Simulink Data Acquisition
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Functional Description Modes of Operation Transmitter – Real Time Modulation Receiver – Real Time Demodulation
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Transmitter Block Diagram
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Filters lower bandwidth requirements Digital Carriers – Sampling effect Adaptable for stored data inputs
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Receiver Block Diagram
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Phase Distortion ChannelChannel 90 degree distortion = data error every time Digital Carrier – Sampling effectsDigital 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]
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Equipment Spectrum Digital TMS320C6713 DSK Agilent 33220A Function Generator Tektronix TDS 3012B 100MHz Oscilloscope
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Software Matlab/Simulink Data GenerationData Generation SimulationSimulation System DesignSystem Design Code Composer Studio DSP Code CreationDSP Code Creation DSP InterfacingDSP Interfacing
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TMS320C6713 DSK TI c6713 DSP 225 MHz225 MHz USB interface AIC23 Audio Codec package 8 KHz, 32 KHz, 44.1 KHz, 48 KHz, and 96 KHz8 KHz, 32 KHz, 44.1 KHz, 48 KHz, and 96 KHz four 3.5 mm stereo audio jacksfour 3.5 mm stereo audio jacks
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Patents/Standards Many patents Analog, DSP, FPGAAnalog, DSP, FPGA No Specific Standards ANSI/SCTE 07 2000ANSI/SCTE 07 2000 64-QAM, 256-QAM Digital Cable IEEE 802.11bIEEE 802.11b PSK Wireless Networking
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Preliminary Results QAM Simulink Development 4-QAM Transmit/Receive4-QAM Transmit/Receive DSP interfacing/testing Digital filteringDigital filtering Analog source Data Source
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4-QAM Simulink Testing Simple Transmitter
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4-QAM Simulink Testing
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DSP Filter Test FIR Filter Fpass 8 KHzFpass 8 KHz Fstop 16 KHzFstop 16 KHz 8 KHz Square Wave Input 44.1 KHz Sampling Rate
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DSP Filter Test
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Schedule of Remaining Work 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
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Questions?
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