On the performance of turbo equalization for precoded ISI channels

Abstract

In this paper, we present a semi-analytical approach for analyzing the serial concatenation (SCC) of a high rate convolutional code and a precoded intersymbol interference (ISI) channel. The significance of the proposed approach is that it can be used to identify, for a given outer high rate code and fixed ISI channel, the precoder that results in the lowest error rate floor. In estimating the bit error performance in the floor region, we use analytical techniques developed for trellis codes to compute the overall system minimum squared Euclidean distance, and then use a semi-analytical approach to find the corresponding multiplicity. We also demonstrate via simulations that the proposed technique may be extended to fading ISI channels with favorable results. We give examples that support our analysis. where he is an assistant professor. His research interests include digital and wireless communications, channel coding, turbo codes, space-time codes and signal processing and coding for data transmission and storage. He has published over 45 refereed technical papers in the above research areas. He has served/is serving on the Technical Program he was a member of Scientific Staff and a senior CDMA designer at the Wireless Technology Labs at Nortel Networks, Ottawa, where he was involved in the development of advanced algorithms for CDMA systems and modem design issues. He has one patent issued on PN code synchronization and three patent applications under review. Since August 2000, he has been with the Electrical Engineering Department at the American University of Sharjah, U.A.E., where he is an assistant professor of Electrical Engineering and the Director of the Cisco Academy at AUS. His current research interests are in the wireless communications area, CDMA technology, PN code synchronization, channel estimation and OFDM. 438A. GHRAYEB AND M. EL-TARHUNI