Table of Contents
ISRN Communications and Networking
Volume 2011, Article ID 980830, 7 pages
Research Article

Estimation of the Feedback Reliability for IB-DFE Receivers

1Wireless Communications Group, Instituto de Telecomunicações, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
2DEE, FCT/UNL, Monte de Caparica, 2829-516 Caparica, Portugal
3Center of Technologies and Systems, UNINOVA, Campus da FCT/UNL, Monte de Caparica, 2829-516 Caparica, Portugal

Received 26 April 2011; Accepted 6 June 2011

Academic Editors: G. DeJean and C. Pomalaza-Ráez

Copyright © 2011 Fábio Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


single-carrier (SC) modulation with frequency-domain equalization (FDE) combined with iterative (turbo) FDE schemes has been shown to be suitable for cyclic-prefix (CP)-assisted block transmission within broadband wireless systems. Its excellent performance in severely time-dispersive channels, makes it a promising candidate for future broadband wireless systems. In this paper we investigated the impact of the correlation factor estimation in the performance of iterative block decision feedback equalization (IB-DFE) receivers. Since the correlation factor represents a key parameter to ensure the good performance of these receivers, reliable estimates of this factor are needed in the feedback loop. We present several methods to estimate the correlation coefficient. We also propose a technique to compensate the inaccuracy of the estimation.