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.

(8414 times read)

Description of the most popular OFDM synchronization algorithm.

(1922 times read)

Introduction to use your soundcard as a software-defined radio

(3041 times read)

Explaining OFDM from the continuous-time standpoint, without FFT/IFFT.

(2561 times read)

How can you recognize a linear, a causal and a time-invariant system?

(10856 times read)

The three different representations of the Fourier Series and how they lead to the Fourier Transform.

(2601 times read)

Listen to the sound of a saxophone and describe it mathematically.

(3102 times read)

Fundamental Fourier: Expansion of periodic functions into sums of sines and cosines.

(5777 times read)

Illustrations on the Convolution Theorem and how it can be practically applied.

(8120 times read)

Explanation on the causes of multipath propagation and illustrating their effects on audio samples.

(1478 times read)

Explanation on why the cyclic prefix (CP) is used in an OFDM system.

(7670 times read)

We illustrate the effect of quantization noise in terms of audio samples.

(2430 times read)

Pictorial description of the operation of circular convolution.

(9570 times read)

What does a quantizer do, what is quantization noise and how do we calculate it?

(2180 times read)

Complete walkthrough of a digital transmission chain including AD/DA conversion and up/downconversion

(4417 times read)

This article explains the convolution operation with the help of animated graphs.

(5569 times read)

Explanation of Aliasing, how it sounds and what the anti-Aliasing filter does.

(2184 times read)

Explanation of the terms group delay and phase delay with an example of a bandpass RLC filter.

(4870 times read)

Explanation why dB conversion sometimes uses factor 10 and sometimes factor 20.

(1866 times read)

Illustration of a basic OFDM example including channel estimation for OFDM.

(9951 times read)

How to create an eye diagram and check for the first and second Nyquist criterion.

(2167 times read)

We derive and illustrate the special properties of the DFT due to its discrete nature including an audio example.

(4752 times read)

Time and frequency properties of the Dirac Comb

(5776 times read)

Understand, how the continuous-time Fourier Transform and discrete Fourier Transform are related

(1971 times read)

Linearity, Time-shift and Modulation property of the Fourier Transform

(1249 times read)

Understanding the first Nyquist criterion and its implications.

(1769 times read)

Motivation for this resource and setting up the coding environment

(4643 times read)

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