DORDT UNIVERSITY ENGINEERING DEPARTMENT
EGR 363 — INTRODUCTION TO COMMUNICATION SYSTEMS
Spring 2023

DAILY NOTES

Click on a date to download the notes for that day.
Click on a "V" to stream the video for that day.
M = Monday, W = Wednesday, F = Friday


DATE TOPICS
M
W
F		  
 
1/13		  
 
V		  
 
 Ch. 1, Intro., Web page tour, Homework, Ch. Capacity (1st day of class.)
M
W
F		 1/16
1/18
1/20		 V
V
V		  Channel model, Experiment v. theory, signal models, intro matlab
 Matlab & Matrix multiplication, Ch. 2, common signals, two sinc functions
 Symmetry (even, odd, Hermitian), power (watts v. watts relative to 1 Ω)
M
W
F		 1/23
1/25
1/27		 V
V
V		  Pwr complex signal, Time-avg pwr, Power & Energy signals, Linear Sys
 System types: linear, continuous, time invariant, causal, v. opposites
 Review sifting property of impulse, stair-step approx, intro convolution
M
W
F		 1/30
2/01
2/03		 V
V
V		  An example of convolution, Properties of convolution
 A review of complex numbers
 Conclusion complex numbers, Intro transforms--change of perspective
M
W
F		 2/06
2/08
2/10		 V
V
V		  Introduction to Fourier Series, The Quintessential Example
 Spectrograms, F.S. of a cosine, Discussion: application of F.S. to photos
 F.S. of common signals, Exponential, Trigonometric, Compact F.S.
M
W
F		 2/13
2/15
2/17		 V
 
V		  Properties of Fourier Series, Parseval's Theorem
 Test #1.
 Intro Fourier Transform, Quintessential Ex, Duality, 1 ↔ δ(f) and δ(t) ↔ 1
M
W
F		 2/20
2/22
2/24		 V
V
V		  F.T.: Duality, Linearity, Symmetry, time, freq shift, Mod, deriv, integration
 F.T.: Energy Spectrum, Parseval, Conv in time mult in freq, Autocorr
 Ch. 3 AM Intro to DSB-LC, Spectrum of DSB-SC, Autotune
M
W
F		 2/27
3/01
 3/03		 V
V
V		  Merits of a modulation: BW, Pwr, noise; Carrier recovery, Normalization
 DSB-LC envelope detection. Efficiency of DSB-LC
 DSB modulation: DSP, Bal. mod., sq.-law, switching, non-lin; Intro QAM
M
W
F		 3/06
3/08
3/10		  
 
 		  No class, Spring Break.
 No class, Spring Break.
 No class, Spring Break.
M
W
F		 3/13
3/15
3/17		  
V
V		  No class, Spring Break.
 Detail on QAM; AM-stereo, NTSC (analog) color TV applications of QAM
 More on TV, other AM mods e.g. M-QAM, Freq. Division Multiplexing (FDM)
M
W
F		 3/20
3/22
3/24		 V
V
V		  FDM, TRF, Regenerative tuning, Superhetrodyne tuning
 Superheterodyne tuning in detail, Image and spurious frequencies
 Double conversion superheterodyne, Single Sideband (SSB), Hilbert
M
W
F		 3/27
3/29
3/31		 V
 
V		  SSB demod via carrier injection (BFO), analytic signals, hearing loop
 Test #2.
 Ch. 4 FM, Intro to FM, How radio signals "look", Comparison, AM vs. FM
M
W
F		 4/03
4/05
4/07		 V
V
 		  Equ'n of angle mod., var defined, FM-PM compared, def. freq., Narrow B
 Tx antenna techniques, NBFM via QAM, Wideband & Bessel functions.
 Easter Break (no class)
M
W
F		 4/10
4/12
4/14		  
V
V		  Easter Break (no class)
 Bessel Fn table, FM B'cast Tx block diagrams, FM B'cast spectrum
 FM B'cast Rx block diagrams, FM demodulators
M
W
F		 4/17
4/19
4/21		 V
V
V		  On video: review of FM reception. Slides & video: Intro to noise
 Noise quieting and capture effect for FM and PM, Intro to color theory
 Rods & cones and human eye, color thry Term Paper Due Friday, 4/21
M
W
F		 4/24
4/26
4/28		 V
V
V		  NTSC analog color video, color image formats and image compression
 Ch 5, Probability and Random Processes, Basic definitions
 Probabilities of ∪, ∩, subsets, conditional probability, Bayes' thm
M
W
F		 5/01
5/03
5/05		 V
V
V		  Defn of Random variable, CDF, PDF, Important types of random variables
 nCr, nPr, w/replacement, Random Variables as models of systems
 Central limit Thm, more Ch 5 slides, Academy Awards Last day of class