Analysis of the iterative detection of Turbo-BLAST systems with EXIT Charts

Tutor: Dirk W├╝bben
Type of Thesis: Diplomarbeit (Dipl.)
date of end: 10/2007
Student: Tim Schnakenberg
Status: finished
ANT-shelfmark: D-10/07-1

Due to the enormous performance enhancement, multi-antenna systems have arrest large attention. The well known BLAST system (Bell-Labs Layered Space-Time) is one very intresting approach to use multiple antennas for increasing the data rate. Thereby the transmitter demultiplexes the information data in so called layers (substreams) and simultaniously transmit them over the several antennas. The receiver uses a successive detection algorithm to optain the information data.

In order to improve the performance of the BLAST system error correcting codes are applied. The whole information data is encoded, interleaved, splitted into layers and transmitted by the antennas. Thereby, the system can be separated into to blocks, namely channel coding and BLAST mapper. From informatin theory it is well known, that iterative decoding and the exchange of soft information between different decoder stages can achieve enormous performance improvements.

In this thesis, several Turbo-BLAST approaches should be implemented and compared. Additionally, the functionallity of iterative decoding has to be investigated by the relationship of the input and output information of the applied soft-in/soft-out decoding algorithms by using EXIT charts. These results can be used to estimate the performance gain per iteration.

Last change on 06.05.2008 by
AIT ieee GOC tzi ith Fachbereich 1
© Department of Communications Engineering - University of BremenImprint / Contact