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.
(13761 times read)
Description of the most popular OFDM synchronization algorithm.
(40669 times read)
Introduction to use your soundcard as a software-defined radio
(28830 times read)
Explaining OFDM from the continuous-time standpoint, without FFT/IFFT.
(18360 times read)
How can you recognize a linear, a causal and a time-invariant system?
(146057 times read)
The three different representations of the Fourier Series and how they lead to the Fourier Transform.
(32506 times read)
Listen to the sound of a saxophone and describe it mathematically.
(23038 times read)
Fundamental Fourier: Expansion of periodic functions into sums of sines and cosines.
(63593 times read)
Illustrations on the Convolution Theorem and how it can be practically applied.
(76870 times read)
Explanation on the causes of multipath propagation and illustrating their effects on audio samples.
(15892 times read)
Explanation on why the cyclic prefix (CP) is used in an OFDM system.
(71906 times read)
We illustrate the effect of quantization noise in terms of audio samples.
(21557 times read)
Pictorial description of the operation of circular convolution.
(41867 times read)
What does a quantizer do, what is quantization noise and how do we calculate it?
(32628 times read)
Complete walkthrough of a digital transmission chain including AD/DA conversion and up/downconversion
(70575 times read)
This article explains the convolution operation with the help of animated graphs.
(74430 times read)
Explanation of Aliasing, how it sounds and what the anti-Aliasing filter does.
(27599 times read)
Explanation of the terms group delay and phase delay with an example of a bandpass RLC filter.
(54271 times read)
Explanation why dB conversion sometimes uses factor 10 and sometimes factor 20.
(124506 times read)
Illustration of a basic OFDM example including channel estimation for OFDM.
(93160 times read)
How to create an eye diagram and check for the first and second Nyquist criterion.
(26351 times read)
We derive and illustrate the special properties of the DFT due to its discrete nature including an audio example.
(87506 times read)
Time and frequency properties of the Dirac Comb
(66206 times read)
Understand, how the continuous-time Fourier Transform and discrete Fourier Transform are related
(26378 times read)
Linearity, Time-shift and Modulation property of the Fourier Transform
(57647 times read)
Understanding the first Nyquist criterion and its implications.
(20471 times read)
Motivation for this resource and setting up the coding environment
(27127 times read)