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Senior Capstone Project Integration of Matlab Tools for DSP Code Generation. ECE Department March 2nd, 2006. Team Members: Kwadwo Boateng and Charles Badu Advisors: Professor Thomas Stewart and Dr Inn Soo Ahn. Project Outline Project Summary Current Status Filter Implementation - PowerPoint PPT Presentation
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Senior Capstone Project
Integration of Matlab Tools for DSP Integration of Matlab Tools for DSP Code GenerationCode Generation
ECE DepartmentMarch 2nd, 2006
Team Members: Kwadwo Boateng and Charles Badu
Advisors: Professor Thomas Stewart and Dr Inn Soo Ahn
Project OutlineProject Outline Project Summary Current Status
Filter Implementation Modulation Schemes
Future Work Questions
PROJECT SUMMARYPROJECT SUMMARY Integrate Matlab tools with code composer studio 3.1 software to
generate C-code on DSP board (TMSC6713DSP board (TMSC6713) Integration process will involve Filter implementation and
Modulation schemes Filters and Modulation schemes (SPD) will be designed in
Simulink and verified experimentally on an oscilloscope Applications of SPD in industry will be examined S-block functions not found in Simulink will be generated and
called as subroutines. (MEX files) SPD executed on DSP board via Mat-lab M file or Simulink block
diagrams Ultimate goal is to produce User ManualUser Manual for DSP and
Communication Theory Students.
DSP BOARD (FEATURES)DSP BOARD (FEATURES)
Signal Processing Description
Host PC with Matlab
Development Tools
Simulink
Code Composer
studio (CCS) IDE
D.S.P boardTMS320C6713
Output file
Re
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Code from Simulink Block Diagram
Figure 1: High-level system block diagram
SYSTEM BLOCK DIAGRAMSYSTEM BLOCK DIAGRAM
FIR Filter Design and ImplementationFIR Filter Design and Implementation
NOTCH FilterFilter that passes most frequencies unaltered, but attenuates those in a narrow range to very low levels
Given Equation:
H(Z)=h0+h1z-1 + h2z-2 2 poles at origin which corresponds to Z2
2 zeros 45 degrees from the origin
Design of Filter given formulae for H(z)Design of Filter given formulae for H(z)A Bandpass filter has transfer Function
(Z-ejpi/4)(Z-e-jpi/4)
H(z)= --------------------
Z2
Solve to get coefficients
Num: [1 -1.41421 1]
Den: [1 0 0] fa=fd*fs
fd=Digital Frequency fa=Analog frequency fs=Sampling frequency
Choosing fs= 8000Hz fd=1/8 ( Ranging between -.5 to .5)
fa= 1000Hz
Mat-lab results:Mat-lab results:
0 500 1000 1500 2000 2500 3000 3500 40000
0.5
1
1.5
2
2.5
3
3.5frequency response
NOTCH FILTER DESIGNNOTCH FILTER DESIGN
H(Z)=h0+hzH(Z)=h0+hz11-1-1 + hz + hz22
-2-2
FIR FILTER EXPERIMENTAL RESULTSFIR FILTER EXPERIMENTAL RESULTS
CommunicationCommunication SystemsSystems
Figure 1-1: The Fundamental Model of Communication
Modulation SchemesModulation Schemes• Amplitude Modulation (AM)• Frequency Shift Keying (FSK)• Double-Sideband Suppressed Carrier (DSB-SC)• Binary Phase-Shift Keying(BPSK)• Quadrature Amplitude Modulation(QAM)
Amplitude Modulation (AM)Amplitude Modulation (AM)
• Amplitude Modulation: the amplitude of a carrier signal is varied with respect to an input modulation signal to convey data.
• Applications: commonly used at radio frequencies and was the first method used to broadcast commercial radio.
• Modeled in project to transmit and receive speech signals.
Envelope Detector CircuitsEnvelope Detector Circuits
AM Experimental Results AM Experimental Results
AM Simulation Results AM Simulation Results
Frequency shift keying (FSK) is the most common form of digital modulation in the high-frequency radio spectrum
Used to send information between digital equipment like teleprinters and computers.
Data is transmitted by the frequency of a carrier in a binary manner to one or the other of two discrete frequencies.
Frequency Shift Keying (FSK)Frequency Shift Keying (FSK)
(FSK) Transmitter(FSK) Transmitter
Signal GenerationSignal Generation
FSK ReceiverFSK Receiver
Test Square waveTest Square wave
FSK Output Signal FSK Output Signal
Double-Sideband Suppressed Carrier Double-Sideband Suppressed Carrier
Double-sideband suppressed-carrier transmission (DSB-SC): transmission in which:
• (a) frequencies produced by amplitude modulation are symmetrically spaced above and below the carrier frequency
• (b) the carrier level is reduced to the lowest practical level, ideally completely suppressed.
DSB-SC TransmitterDSB-SC Transmitter
DSB-SC ReceiverDSB-SC Receiver
DSB-SC Receiver DSB-SC Receiver
• Phase-shift keying is a digital modulation scheme that conveys data by changing the phase of a reference signal (carrier wave) and BPSK is the simplest form of phase-shift keying.
• Generated the same way as a DSB-SC, but m(t) is a unipolar data signal
• Demodulated using a Costas loop
Binary Phase-Shift Keying Binary Phase-Shift Keying
Costas Phase-Locked LoopCostas Phase-Locked Loop
BPSK Simulation ResultsBPSK Simulation Results
Modulation Schemes QUADRATURE AMPLITUDE MODULATION (QAMQUADRATURE AMPLITUDE MODULATION (QAM))
Combination of : Amplitude Modulation (AM) Phase shift Keying (PSK)
Phase and Amplitude are Varied
Overcome constraints of complex AM or PM Transmits more bits per second Makes use of minimum bandwidth
GENERAL QAM TRANSMITTER
S(t)=X(t)CosWct - Y(t)SinWctS(t)=X(t)CosWct - Y(t)SinWct
Wc=2pifcWc=2pifc
QAM TRANSMITTER
S(t)=X(t)CosWct - Y(t)SinWctS(t)=X(t)CosWct - Y(t)SinWct
Wc=2pifcWc=2pifc
SIMULATION RESULTS OF QAM TRANSMITTER
EXPERIMENTAL RESULTS FOR QAM TRANSMITTER
QAM RECEIVER
Recovering Signals for Real X (t) & Quadrature Y (t)
MODIFIED DEMODULATORMODIFIED DEMODULATOR
SIMULATION RESULTS SIMULATION RESULTS FOR RECEIVER & TRANSMITTER FOR RECEIVER & TRANSMITTER
EXPERIMENAL RESULTS FOR TRANSMITTEREXPERIMENAL RESULTS FOR TRANSMITTER
EFFECTS OF CAPACITOR COUPLING
EFFECTS OF CAPACITOR COUPLING
PROOFING EFFECTS OF CAPACITOR COUPLINGPROOFING EFFECTS OF CAPACITOR COUPLING
EXPERIMENAL RESULTS FOR CAPACITOR COUPLINGEXPERIMENAL RESULTS FOR CAPACITOR COUPLING
Future WorkFuture Work
• Implement Costas Phase-Locked Loop on DSP board
• Work on Frequency Division Multiplexing (FDM)
• Orthogonal Frequency Division Multiplexing (OFDM)
• FM Stereo System
Questions ??Questions ??
THE GRAND ARRIVAL!!!