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.

(2232 times read)

Description of the most popular OFDM synchronization algorithm.

(6279 times read)

Introduction to use your soundcard as a software-defined radio

(6933 times read)

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

(4563 times read)

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

(41852 times read)

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

(8721 times read)

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

(6119 times read)

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

(17314 times read)

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

(23387 times read)

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

(3211 times read)

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

(17590 times read)

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

(5244 times read)

Pictorial description of the operation of circular convolution.

(19090 times read)

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

(6937 times read)

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

(15424 times read)

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

(23885 times read)

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

(6975 times read)

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

(13023 times read)

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

(10698 times read)

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

(23605 times read)

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

(5279 times read)

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

(18136 times read)

Time and frequency properties of the Dirac Comb

(14685 times read)

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

(5479 times read)

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

(10253 times read)

Understanding the first Nyquist criterion and its implications.

(4155 times read)

Motivation for this resource and setting up the coding environment

(8012 times read)

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