HAUPTSEMINAR DIGITALE KOMMUNIKATIONSSYSTEME IM SS 2005, VORTRAG VOM 07.04.05 IN ST. PETERSBURG 1 Iterative Entzerrung

tive Equalization or Turbo-Equalization is an iterative technique which concatenates the processes of equalization and decoding according to the Turbo-Principle[1]. In conventional receivers, these two processes are separated and only pass hard decisions instead of soft decisions. Iterative Equaliziation uses this soft information in a kind of feedback loop. Iterative Equalization can impressively reduce the bit error rate of communication systems which pass information through a channel with intersignal interference. In the following, Iterative Equalization will be explained using a concrete example. I. EINLEITUNG Wie in Abbildung 1 gezeigt, laufen in der digitalen Nachrichtenübertragung üblicherweise die folgenden Vorgänge ab. Im Encoder findet die Quellenkodierung der binären Datensequenz ak in eine Sequenz bk, die nicht nur di