Ali Djebbari

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It is well known that multipath channel and carrier frequency offset destroy the orthogonality between subcarriers in the downlink of MC-CDMA and degrade the system performance. In this paper, a new low complexity algorithm is proposed to iteratively estimate the carrier frequency offset (CFO) and the channel equalizer using only the guard interval (GI)(More)
A novel GPS satellite signal acquisition scheme that utilizes lifting wavelet to improve acquisition performance is proposed. Acquisition in GPS system is used to calculate the code phase (or shift) and find the pseudo-range, which is used to calculate the position. The performance of a GPS receiver is assessed by its ability to precisely measure the(More)
In this paper, we propose a novel idea for improvement performances of the leader M-BCJR algorithm functioning in low complexity. The basic idea consists to localize error instant possibility, and then increase the complexity around this moment. We also propose an easy and important idea for early localisation of erroneous moments. We call this new(More)
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(More)
This paper introduces a new blind time domain equalization (TEQ) technique for downlink MC-CDMA systems operating in multipath fading channels. This equalization exploits the guard interval redundancy (GI) together with the excess codes (EC). Indeed, since in CDMA-based wireless systems, the number of users per cell is significantly less than the spreading(More)
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