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Instructor: Dr Kumaresan
email: kumar@ele.uri.edu

TA(s): Vijay Kumar Peddinti
email: vijay@ele.uri.edu, office hours: TBA, Kelley 201
Danny (Daxian Yun)
email: dyun@ele.uri.edu, office hours: TBA

Lab Schedule
Monday: 2PM to 4:45PM
Thursday: 2PM to 4:45PM

In the lab students use TIMS (Telecommunication Instructional Modelling System) 301 Modeling systems, to look at the waveforms (using oscilloscope) explaining the basic principles of modulation and demodulation (AM/FM). The results are then verified using Matlab.

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Labs

• Lab Policy

• Lab1 : Periodic Signals and the Fourier Series
  Grading/Report Format For Lab1
  MATLAB Results for Square Wave input   Triangle Wave input   Sawtooth Wave input  
  FFT : tutorial written by Jesse Hansen
  Fourier Series Approximation Johns Hopkins University Link

• Lab2: This lab introduces you to the TIMS 301 Modeling systems, here is the documentation
  (i) Modeling an Equation Theory Lab handout
  (ii) DSBSC Generation Theory Lab handout
  Grading/Report Format For lab2
  Please note that the question 5 refers to the questions from the "Theory handout"

  MATLAB Hints and plots
  • MATLAB Hint To compute the filter coefficients:
    [b] = fir1(filter_order,Cutoff_freq/(sampling_freq/2),'filter_type');
    Look at commands conv, filter (For example: type help conv in the matlab's command window)
    
  
  
  • MATLAB Results: When signals are inphase and out of phase
    DSBSC time domain signal and the Spectrum
    

• Lab3 Part a: Amplitude Modulation
  Grading/Report Format For lab3 Part a
  If you get a chance please check this Tutorial for Amplitude Modulation
  

  MATLAB plots
  • MATLAB Results for a cosine wave and the FFT: (you can also unwrap the phase)
    cosine wave   Real and Imaginary plots of FFT   Magnitude and Phase plots of FFT  
    

• Lab3 Part b: Envelope and Envelope Recovery
  Grading/Report Format For lab3 Part b
  

Please Note You have one additional week to hand in Lab 3.

• Lab4 Part a: Sampling Theorem
  Lab4 Part b: Sampling With Sample and Hold
  Grading/Report Format For lab4
  

• Lab5: FM   Please use the procedure from the following handout.
  Procedure and Grading/Report Format For lab5
  
  FM Generation   FM Demodulation
  Detailed Reference handout for FM
  

MATLAB Assignment
• Matlab Assignment Handout
• MATLAB Results should look like:
  FM spectra for:
  f2 = 1000Hz beta = 2   and beta = 8  
  f2 = 200Hz   beta = 2   and beta = 8  
  Demodulated signal Should be a sinusoid of frequency f2
  

• Lab6: PCM Please use the procedure from the following handout.
  Lab procedure For lab6
  
  Grading/Report Format For PCM
  
  TIMS handouts: PCM Encoding   PCM Decoding
  Detailed Reference handouts: PCM Encoding   PCM Decoding
  

  MATLAB Assignment
  • Generate a 2KHz sinusoid with a Peak to Peak Voltage of 2V (+/- 1V ), and generate a quantized signal when N=8 and N=16 levels. Calculate SQNR, Signal to Quantization Noise Ratio.
  • MATLAB Results for Quantization should look like: 8 levels and 16 levels  
    Results shown for 2 periods here
    
  
  Additional Reference Material
  • Wikipedia References for terms in the lab handout: "Companding" "A Law" "Mu Law"
    Also can be found in the textbook: Pages 147 to 152
    
  • PCM online tutorials Pdf file (L3 Communications)
    PCM Noise and Companding ppt file by Huseyin Bilgekul, Eastern Mediterranean University

• Lab 7: BPSK Detailed Handout
  Lab Handouts for Generation   Demodulation
  

• Lab 8: QPSK Detailed Handout
  Lab Handouts for Generation   Demodulation
  

• Lab 9: FSK Detailed Handout
  Lab Handouts for Generation   Demodulation
  

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Latest Updates

• Posted Lab9: FSK Encoding/Decoding -- 11/25/2012
• Posted Lab8: QPSK Encoding/Decoding -- 11/14/2012
• Posted Lab7: BPSK Encoding/Decoding -- 11/7/2012
• Posted Grading/Report Format For PCM -- 10/30/2012
• Posted Lab6: PCM -- 10/19/2012
• Posted Lab5: FM -- 10/12/2012
• Posted Grading/Report Format For Lab4 -- 10/5/2012
• Posted Lab4: Sampling Theorem -- 9/28/2012
• Posted Grading/Report Format For Lab3 -- 9/28/2012
• Posted Lab3: Amplitude Modulation -- 9/23/2012
• Posted Grading/Report Format For Lab2 -- 9/14/2012
• Posted Lab2: Modeling an Equation, DSBSC -- 9/14/2012
• Posted Grading/Report Format For Lab1 -- 9/12/2012
• Posted Lab1: Periodic Signals and the Fourier Series -- 9/9/2012

Lab Pictures