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Etude de l'amplification non linéaire de signaux MIMO pour les terminaux radio-mobiles

Abstract : Combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has became a promising candidate for high performance wireless communications. Nevertheless one major disadvantage of MIMO-OFDM systems lies in a prohibitively large peak-to-average power ratio (PAPR) of the transmitted signal on each antenna. In this thesis we extend from SISO to MIMO systems a method based on allocating dedicated subcarriers for PAPR mitigation. These subcarriers are located instead of unused subcarriers of OFDM spectrum under the assumption they all fall under the mask. This is originally cleared up with a SOCP optimization algorithm applied before space time coding scheme. This jointly mitigates PAPR on each MIMO branch scheme. This approach does not degrade at the same time the bit-error-rate (BER) and the data bit rate and no side information (SI) transmission is required. Simulation results are presented in the IEEE 802.16 WiMAX standard context: an Alamouti space time code with two transmitted antennas and 256 OFDM subcarriers are considered among with 56 are unused and allocated for PAPR reduction. PAPR gains up to 7 dB are obtained depending on mean power increase limitation. Moreover, with a spectrum mask constraint, this method is standard compliant.
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Submitted on : Tuesday, January 20, 2009 - 8:38:27 AM
Last modification on : Wednesday, April 27, 2022 - 3:55:26 AM
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  • HAL Id : tel-00354492, version 1


Basel Rihawi. Etude de l'amplification non linéaire de signaux MIMO pour les terminaux radio-mobiles. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 2008. Français. ⟨tel-00354492⟩



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