Digital signal processing, foundations of communications engineering and physical layer communication techniques.
Illustrative explanation instead of boring math
Python code for all examples
Get the code and play around on your own
Refer to an introduction for a site overview and how to setup the coding environment.
Numerical calculations and sound samples about prime numbers and Riemann's prime-generating function.
(15953 times read)
Description of the most popular OFDM synchronization algorithm.
(44245 times read)
Introduction to use your soundcard as a software-defined radio
(30171 times read)
Explaining OFDM from the continuous-time standpoint, without FFT/IFFT.
(19440 times read)
How can you recognize a linear, a causal and a time-invariant system?
(148723 times read)
The three different representations of the Fourier Series and how they lead to the Fourier Transform.
(35217 times read)
Listen to the sound of a saxophone and describe it mathematically.
(24237 times read)
Fundamental Fourier: Expansion of periodic functions into sums of sines and cosines.
(67073 times read)
Illustrations on the Convolution Theorem and how it can be practically applied.
(79807 times read)
Explanation on the causes of multipath propagation and illustrating their effects on audio samples.
(17036 times read)
Explanation on why the cyclic prefix (CP) is used in an OFDM system.
(76336 times read)
We illustrate the effect of quantization noise in terms of audio samples.
(22753 times read)
Pictorial description of the operation of circular convolution.
(43245 times read)
What does a quantizer do, what is quantization noise and how do we calculate it?
(34799 times read)
Complete walkthrough of a digital transmission chain including AD/DA conversion and up/downconversion
(74043 times read)
This article explains the convolution operation with the help of animated graphs.
(75947 times read)
Explanation of Aliasing, how it sounds and what the anti-Aliasing filter does.
(28718 times read)
Explanation of the terms group delay and phase delay with an example of a bandpass RLC filter.
(56592 times read)
Explanation why dB conversion sometimes uses factor 10 and sometimes factor 20.
(129042 times read)
Illustration of a basic OFDM example including channel estimation for OFDM.
(97086 times read)
How to create an eye diagram and check for the first and second Nyquist criterion.
(27847 times read)
We derive and illustrate the special properties of the DFT due to its discrete nature including an audio example.
(92585 times read)
Time and frequency properties of the Dirac Comb
(70000 times read)
Understand, how the continuous-time Fourier Transform and discrete Fourier Transform are related
(28659 times read)
Linearity, Time-shift and Modulation property of the Fourier Transform
(60384 times read)
Understanding the first Nyquist criterion and its implications.
(23391 times read)
Motivation for this resource and setting up the coding environment
(30087 times read)