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.

(8752 times read)

Description of the most popular OFDM synchronization algorithm.

(3215 times read)

Introduction to use your soundcard as a software-defined radio

(4095 times read)

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

(3053 times read)

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

(16164 times read)

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

(4268 times read)

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

(3949 times read)

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

(8868 times read)

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

(10908 times read)

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

(1934 times read)

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

(10392 times read)

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

(3112 times read)

Pictorial description of the operation of circular convolution.

(11881 times read)

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

(3342 times read)

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

(6672 times read)

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

(9262 times read)

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

(3264 times read)

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

(6719 times read)

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

(2890 times read)

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

(13191 times read)

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

(2995 times read)

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

(6890 times read)

Time and frequency properties of the Dirac Comb

(7946 times read)

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

(2865 times read)

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

(2341 times read)

Understanding the first Nyquist criterion and its implications.

(2421 times read)

Motivation for this resource and setting up the coding environment

(5534 times read)

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