Forschung: Lehrstuhl für Nachrichtentechnik

Coding and Modulation

Power efficient communication requires higher order modulation and forward error correction (FEC) codes. We are working on approaching the theoretical limits by implementing Shannon‘s blueprint. Two key concepts are probabilistic shaping and quantized message passing to reduce power consumption and complexity. We design and implement state-of-the-art low-density parity-check (LDPC) and polar codes and decoders over binary and non-binary fields. We test our prototypes in close collaboration with industry.

Currently working in this area:

  • Emna Ben Yacoub
  • Mustafa Coşkun
  • Delcho Donev
  • Or Levi
  • Tobias Prinz
  • Yusuf Şener
  • Thomas Wiegart
  • Peihong Yuan

Information Theory for Machine Learning, Security, and Identification

We are developing information theoretic frameworks, codes, and algorithms for signal processing problems such as machine learning and compressed sensing. As the need for secure communications increases, we concentrate on privacy and secrecy related topics. We further investigate non-standard topics such as information theory and codes for identification

Currently working in this area:

  • Christian Deppe
  • Abdalla Ibrahim
  • Diego Lentner
  • Mohammad Salariseddigh

Wireless and Optical Communications

A key technology to increase data rates is multi-input, multi-output (MIMO) via space-division multiplexing (SDM). For wireless applications, massive MIMO considers hundreds of antennas with simplified signal processing. Our research focuses on complexity reduction via few-bit analog-to-digital converters and simplified precoding. For optical fiber applications, waveform propagation is usually described by a non-linear Schrödinger equation (NLSE). We are investigating the capacity of this model by using pseudo-linear and non-linear Fourier transform transmission. We are further studying information theory for quantum communications.

Currently working in this area:

  • Amir Ahmadian
  • Christian Deppe
  • Javier Garcia
  • Tayyab Mehmood
  • Andrei Nedelcu
  • Uzi Pereg