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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.

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Presentation on theme: "Senior Capstone Project Integration of Matlab Tools for DSP Code Generation ECE Department March 2nd, 2006 Team Members: Kwadwo Boateng and Charles Badu."— Presentation transcript:

1 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

2 Project Outline Project Summary Current Status  Filter Implementation  Modulation Schemes Future Work Questions

3 PROJECT SUMMARY DSP board (TMSC6713  Integrate Matlab tools with code composer studio 3.1 software to generate C-code on DSP 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 User Manual  Ultimate goal is to produce User Manual for DSP and Communication Theory Students.

4 DSP BOARD (FEATURES)

5 Figure 1: High-level system block diagram SYSTEM BLOCK DIAGRAM

6 FIR Filter Design and Implementation NOTCH Filter Filter that passes most frequencies unaltered, but attenuates those in a narrow range to very low levels Given Equation : H(Z)=h0+h 1 z -1 + h 2 z -2 2 poles at origin which corresponds to Z 2 2 zeros 45 degrees from the origin

7 Design of Filter given formulae for H(z) A Bandpass filter has transfer Function (Z-e jpi/4 )(Z-e - jpi/4 ) H(z)= Z 2 Solve to get coefficients Num: [ ] Den: [1 0 0] f a =f d * f s f d =Digital Frequency f a =Analog frequency f s =Sampling frequency Choosing f s = 8000Hz f d =1/8 ( Ranging between -.5 to.5) f a = 1000Hz

8 Mat-lab results:

9 NOTCH FILTER DESIGN H(Z)=h0+hz hz 2 -2

10 FIR FILTER EXPERIMENTAL RESULTS

11 Communication Systems Figure 1-1: The Fundamental Model of Communication Modulation Schemes Amplitude Modulation (AM) Frequency Shift Keying (FSK) Double-Sideband Suppressed Carrier (DSB-SC) Binary Phase-Shift Keying(BPSK) Quadrature Amplitude Modulation(QAM)

12 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.

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14 Envelope Detector Circuits AM Experimental Results AM Simulation Results

15 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)

16 (FSK) Transmitter (FSK) Transmitter Signal Generation Signal Generation

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18 FSK Receiver FSK Receiver Test Square wave Test Square wave

19 FSK Output Signal FSK Output Signal

20 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.

21 DSB-SC Transmitter DSB-SC Receiver DSB-SC Receiver

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23 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

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25 Costas Phase-Locked Loop Costas Phase-Locked Loop

26 BPSK Simulation Results BPSK Simulation Results

27 Modulation Schemes QUADRATURE 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

28 GENERAL QAM TRANSMITTER S(t)=X(t)CosWct - Y(t)SinWct Wc=2pifc

29 QAM TRANSMITTER S(t)=X(t)CosWct - Y(t)SinWct Wc=2pifc

30 SIMULATION RESULTS OF QAM TRANSMITTER

31 EXPERIMENTAL RESULTS FOR QAM TRANSMITTER

32 QAM RECEIVER Recovering Signals for Real X (t) & Quadrature Y (t)

33 MODIFIED DEMODULATOR

34 SIMULATION RESULTS FOR RECEIVER & TRANSMITTER

35 EXPERIMENAL RESULTS FOR TRANSMITTER EFFECTS OF CAPACITOR COUPLING

36 PROOFING EFFECTS OF CAPACITOR COUPLING

37 EXPERIMENAL RESULTS FOR CAPACITOR COUPLING

38 Future Work Implement Costas Phase-Locked Loop on DSP board Work on Frequency Division Multiplexing (FDM) Orthogonal Frequency Division Multiplexing (OFDM) FM Stereo System

39  Questions ??

40 THE GRAND ARRIVAL!!!


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