Wcdma for Umts
Multi-Carrier and Spread Spectrum Systems
Multi-Carrier and Spread Spectrum Systems
Generalized multicarrier CDMA: unification and linear equalization
EURASIP Journal on Applied Signal Processing
Efficient, high performance, subspace tracking for time-domain data
IEEE Transactions on Signal Processing
A pseudorandom postfix OFDM modulator - semi-blind channel estimation and equalization
IEEE Transactions on Signal Processing
MMSE equalization of downlink CDMA channel utilizing unused orthogonal spreading sequences
IEEE Transactions on Signal Processing
Multi-carrier transmission techniques for wireless communication systems: a survey
WSEAS TRANSACTIONS on COMMUNICATIONS
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
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This paper introduces new blind time domain equalization (TEQ) techniques for downlink multicarrier code division multiple access (MC-CDMA) systems. This equalization exploits the guard interval (GI) redundancy together with the excess codes (EC) to restore the structural properties of MC-CDMA signal destroyed by multipath fading channels. Indeed, since in CDMA based wireless systems, the number of users per cell is significantly less than the spreading factor, a base station can set apart a subset of the codes, the excess codes that will not be used for spreading. It is shown that the joint use of the EC and GI redundancy improves significantly the equalization performance compared to the GI only or EC only cases. A second contribution consists in exploiting the previous information together with the one given by a pilot sequence in a semi blind scheme to further improve the performance. Finally, we propose a new adaptive algorithm for the estimation and tracking of the equalizer that has a faster convergence rate compared to existing algorithms of similar complexity order. Simulation based performance evaluations are given at the end of this paper to assess the effectiveness of the proposed methods in MC-CDMA.