Introduction to Data Communications (S1, 2014)

Data Transmission

Lecture Material

Lecture Notes: View, Print, Source
Signal equation, time domain plot and frequency domain plot: View, Print
Calculations of data rate, Nyquist capacity and Shannon capacity: View, Source
Example showing impact of noise on different signals, as well as an explanation of how the example signals are generated using sox and Audacity

Readings

Stallings: chapter 3
Forouzan: chapter 3
Kurose: none

Videos

This year: Part 1, Part 2, Part 3, Part 4, Part 5, Part 6 (Decibels), Part 7 (dBm)
Last year: Part 1 (CS6), Part 1 (IT), Part 2 (CS), Part 2 (IT), Part 3 (CS), Part 3 (IT)

Notes

In lecture I plotted several signals using GNU Octave, free open-source mathematics software. If you want to try, you can install Octave on your own computer, start it, and copy-and-paste the commands I used from this file. Some of the plots produced are below.
Notes from the lecture are below. Hover over the image to see a description; right-click and view the image to zoom in. Alternatively you can download a zip archive of all the image or a printable PDF of the notes.

Signals in Time and Frequency Domain

Time domain plot of multiple signals Time domain plot of signal s1 Time domain plot of signal s2 Signal equation and characteristics of signal s2 Frequency domain plot of signal s2 Time domain plot of signal s3 Time domain plot of signal s4 Time domain plot of signal s with 27 components

Signals, Bandwidth and Data Rate

Data rate calculations for signals Comparison of components, bandwidth and data rate Data rate calculation with 4MHz bandwidth and 2 components Data rate calculation with 8MHz bandwidth and 2 components

Signals, Noise and Multiple Levels

Transmission scheme for noise example Attenuation and Noise Sine Wave and Noise Square Wave and Noise Signal with 2 Levels (1) Signal with 2 Levels (2) Signal with 4 Levels (1) Signal with 4 Levels (2)