Homepage Bernd Friedrichs

Prof. Dr.-Ing. Bernd Friedrichs

1974	Abitur (high-school diploma from Gymnasium Raabeschule Braunschweig)
1980	Graduated with a Dipl.-Math. diploma in mathematics and computer science from Technical University of Braunschweig, Germany (Diploma thesis about multivariate statistics and discriminant analysis for pattern recognition)
1990	Ph.D. (Dr.-Ing. degree) in electrical engineering from University of Erlangen-Nürnberg, Germany (Ph.D. thesis about implementation of adaptive filters in digital receivers)
1993-2020	Part-time lecturer at Karlsruhe Institute of Technology (KIT) at Communications Engineering Lab (CEL), teaching "Verfahren zur Kanalcodierung" (error-control coding)
2002	Honorary Professor at KIT (formerly University of Karlsruhe), Germany
1980-2009	Employed by Ericsson (formerly known as AEG-Telefunken, ANT Telecommunications, Bosch Telecom Public Networks, Marconi Communications) in Backnang (close to Stuttgart), Germany, in the System Engineering department for Fixed Wireless Access, earlier in the Advanced Development department
2009-2021	Employed by Tesat-Spacecom in Backnang, communication payloads system engineering

Summary of Reserach Interests

Mathematical statistics and stochastic processes
Digital signal processing and adaptive filters
Error-control coding, cryptography and Shannon information theory
Satellite communications and satellite networks, RF links and optical links
Satellite payload engineering, architectures and design, analog and digital domains
Simulation of communication systems (wire, cellular, satcom), including channel coding and RF features
Numerical programming (since 20 years mainly based on Matlab)
Software defined radio
Principles of communication and architecture of mobile radio systems
Microwave radio, in particular adaptive packet-based point-to-multipoint systems
Data link control layer, protocols and testing, SDL/TTCN and ASN.1
Standardization of broadband radio networks (ETSI) and satellite communications (CCSDS)
European Norms (EN, Harmonized Standards)
6 years chairman of ETSI Technical Body BRAN (Broadband Radio Access Networks)

Activities illustrated

EDRS System (European Data Relay Satellite)
Legend: EDRS-A @ 9°E, EDRS-C @ 31°E, red = optical link from Sentinel, green = link from ISS, light blue = Ka-band feeder downlink to Central Europe (note that similar pics can be found on the web but some of them do not display the links correctly)

Antennas for Long-Haul Line-of-Sight Radio

Block Diagram of Coded Wireless Transmission

Arithmetic Operations in Galois Field GF(8)

Point-to-Multipoint Communication

Interference Pattern for Cellular Radio Systems with Frequency Re-Use

Upper and Lower Bounds for Minimum Distance of Block Codes

The n-dimensional Gaussian Distribution

Simulation and Analysis Tool for Satellite Payloads (old release)

Various Error Rates and Reference Points in a Satellite Network

Spectra in Double-Conversion Receiver

Different Bit Error Structures – the (Outer) Coding Scheme should be designed accordingly

ETSI Technical Body BRAN (Broadband Radio Access Networks) - Snapshots representing years 2003-2008

Data Link Layer Specification via Message Sequence Charts and High-Level MSCs (State Diagrams) - Telelogic SDL & TTCN Suite

Adaptive Transversal Filter (Equalizer)

Asymmetric Encryption for Privacy

Main Areas of Technical and Scientific Expertise / Consulting

See below for a detailed description of the main areas of activities during my professional career in communications engineering.

Even after reaching the standard retirement age for employees, I am still active as an expert and consultant, expecially for
satellite communications engineering. Inquiries are welcome!

in Bearbeitung

ReSAT (Repeater Simulation and Analysis Tool)

The development of this simulation tool dates back to around the year of 2000. In 2011, the tool was taken over by Tesat and until 2021 I was involved
and responsible for various extensions to address new topics and to simplify user interfaces. The simulator can be configured to represent transparent
repeaters, regenerative payloads, relay satellites, earth observation satellites as well as radio-over-fiber systems. Any further details on this release is
limited to screenshots here.

GUI Overview:
19 upper tabs for results including first tab for block diagram
24 lower tabs for setup

Screenshots lower tabs (simulation setup):

Screenshots upper tabs (simulation results):

Professional Societies

Informationstechnische Gesellschaft (ITG) within VDE
Insitute of Electrical and Electronics Engineers (IEEE)

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