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.

(2473 times read)

Description of the most popular OFDM synchronization algorithm.

(6855 times read)

Introduction to use your soundcard as a software-defined radio

(7488 times read)

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

(4869 times read)

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

(47888 times read)

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

(9412 times read)

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

(6528 times read)

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

(18885 times read)

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

(25683 times read)

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

(3512 times read)

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

(18657 times read)

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

(5615 times read)

Pictorial description of the operation of circular convolution.

(20014 times read)

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

(7657 times read)

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

(16947 times read)

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

(26636 times read)

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

(7634 times read)

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

(20958 times read)

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

(12569 times read)

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

(25225 times read)

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

(5667 times read)

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

(19949 times read)

Time and frequency properties of the Dirac Comb

(15768 times read)

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

(5959 times read)

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

(11716 times read)

Understanding the first Nyquist criterion and its implications.

(4505 times read)

Motivation for this resource and setting up the coding environment

(8454 times read)

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