Dr.-Ing. Matthias Wetz

PhD Thesis

Topic

Transmission Methods for Wireless Multi Carrier Systems in Time-Varying Environments

Description

Orthogonal frequency division multiplexing (OFDM) in combination with channel coding is a well known transmission technique, which is suitable for frequency selective channels. In fast fading environments, the information from the channel estimator, needed for coherent detection, is outdated very quickly. Therefore it is sometimes beneficial to use noncoherent detection, where channel estimation is not necessary. OFDM-MFSK is a combination of OFDM and M-ary frequency shift keying, that allows noncoherent signal detection. Using suitable OFDM parameters, OFDM-MFSK is a robust transmission scheme, that can be detected with low complexity. In this thesis, several methods based on OFDM-MFSK are examined that achieve improved robustness and performance. The focus is on iterative methods that exploit the redundancy of the channel code to improve the demodulation process. Furthermore, the relationship of OFDM-MFSK-based noncoherent modulation schemes to other schemes such as noncoherent space-time coding is examined.

Research Interests

  • Wireless transmission in fast fading environments
  • Iterative receivers
  • OFDM, WiMAX
  • PAPR reduction methods

Publications

Copyright:
The material available for download is for personal use only. It may not be reposted without the explicit permission of the authors or other copyright holders. The work already published by the IEEE is under its copyright. Personal use of this material is permitted. However, permission to reprint or republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Publications

COST

Copyright:
The material available for download is for personal use only. It may not be reposted without the explicit permission of the authors or other copyright holders. The work already published by the IEEE is under its copyright. Personal use of this material is permitted. However, permission to reprint or republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

COST Presentations

Supervised Theses

Copyright:
The material available for download is for personal use only. It may not be reposted without the explicit permission of the authors or other copyright holders. The work already published by the IEEE is under its copyright. Personal use of this material is permitted. However, permission to reprint or republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Supervised Master and Diploma Theses

Supervised Bachelor Theses and Student Projects

Alumni

Dr.-Ing. Matthias Wetz

Dr.-Ing. Matthias Wetz
Dr.-Ing. Matthias Wetz