SINR Estimation of OFDM-CDMA Systems with Constant Timing Offset: a Large System Analysis

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Nasser, Youssef; Noes, Mathieu des (CEA-LETI, 17 Avenue des Martyrs, 38054 Grenoble, France)
Ros, Laurent; Jourdain, Geneviève (Laboratoire des Images et des Signaux, INPG, Grenoble, France)

This article presents the impact of a constant timing error on the performance of a downlink 2 dimensional spreading OFDM-CDMA system. This impact is measured by the Signal to Interference plus Noise Ratio (SINR) degradation after equalization and despreading. Using random matrix theory, an asymptotic evaluation of the SINR is obtained. It is independent of the value of users' spreading code while taking into account their orthogonality. Simulation results are provided to evaluate and discuss the validity of this model.