Title :
Semi-Blind Equalization of Downlink MC-CDMA Systems
Author :
Djebbar, A.B. ; Abed-Meraim, K. ; Djebbari, A.
Author_Institution :
TTNS Lab., Univ. of Sidi Bel Abbes, Algeria
Abstract :
It is known that multicarrier code division multiple access (MC-CDMA) systems suffer from intersymbol interference (ISI) and intercarrier interference (ICI). In this paper, we introduce new semi-blind time domain equalization (TEQ) techniques for downlink MC-CDMA systems. This equalization exploits the guard interval redundancy (GI) together with the information given by a pilot sequence in one hand and the spreading code matrix in other hand. We propose in a second contribution an adaptive algorithm for the estimation and tracking of the equalizer that has a faster convergence rate. Extensive performance evaluation are given at the end of this paper to assess the effectiveness of the proposed methods in MC-CDMA.
Keywords :
blind equalisers; code division multiple access; convergence; intercarrier interference; intersymbol interference; matrix algebra; time-domain analysis; ISI; TEQ techniques; adaptive algorithm; convergence rate; downlink MC-CDMA systems; guard interval redundancy; intercarrier interference; intersymbol interference; multicarrier code division multiple access systems; performance evaluation; pilot sequence; semi-blind time domain equalization; spreading code matrix; Downlink; Educational institutions; Equalizers; Intersymbol interference; Laboratories; Multiaccess communication; Multicarrier code division multiple access; OFDM modulation; Signal processing; Vectors; GI; MC-CDMA; TEQ; excess codes; semi-blind;
Conference_Titel :
Signal Processing and Communications, 2007. ICSPC 2007. IEEE International Conference on
Conference_Location :
Dubai
Print_ISBN :
978-1-4244-1235-8
Electronic_ISBN :
978-1-4244-1236-5
DOI :
10.1109/ICSPC.2007.4728355
