Code Design for IDMA systems

Tutor: Florian Lenkeit
Type of Thesis: Projektarbeit (Dipl.)
date of end: -
Student: Jörg Holzapfel
Status: finished
ANT-shelfmark:
Abstract:

IDMA is a non-orthogonal multiple access scheme in which user separation is solely achieved by assigning different unique interleaving patterns to each user. Furthermore, a low-rate channel code has to be applied in order to support multiple users. Usually, a serial concatenation of a convolutional code and a simple repetition code is chosen here. While the task of the convolutional code is error protection, the repetition code is applied in order to achieve spectral spreading and, thus, ensure convergence of the iterative detection process. In this thesis, code desing based on EXIT analysis should be investigated. The idea hereby is to adapt the transfer characteristic of the desired code to the transfer characteristic of the multiuser detector in order to ensure convergence while keeping the rate loss as low as possible. Interesting candidates for this code design are Irregular Repeate Accumulate Codes (IRA) which should be the starting point of the investigations.

Last change on 07.10.2014 by F. Lenkeit
AIT ieee GOC tzi ith Fachbereich 1
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