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Approche conjointe de la réduction du facteur de crête et de la linéarisation dans le contexte OFDM.

Abstract : Power amplifiers are key components of current telecommunications systems. Their linearity (to preserve the quality of the data) and efficiency (for power savings) are the primary concerns of designers. However, they are non-linear analog components in nature that cause spectral leakage, warping and clustering of the constellation. The overall consequences of this are out-of-band interferences and Bit Error Rate (BER) degradation at the receiver.OFDM’s modulation used in many standards such as Wi-Fi, WiMAX, digital TV, LTE, etc. generates temporal signals with high power fluctuations also termed as Peak-to-average Power Ratio (PAPR). High PAPRs aggravate the non-linearity problem of the amplifier and reduce its efficiency. The objective of this thesis is to jointly increase the linearity and the efficiency of the power amplifier.For this, we focus on a joint approach of linearization and PAPR reduction. These two methods so far discussed separately in the literature are complementary and interdependent. This has been proven through an analytical study that we conducted. Through the joint approach, the two methods can be simply associated; in this case we speak of non-collaborative approach, or allowed to exchange some information in order to adapt each other. This latter case is collaborative approach. Then, we proposed algorithms of collaborative approach based on adding signal techniques. PAPR reduction and predistortion (chosen as linearization’s method) are merged into one global adding signal formulation. A joint additional signal is then generated to compensate at the same time the non-linearities introduced by the power amplifier and reduce the dynamic range of the signal to be amplified.
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Submitted on : Wednesday, May 7, 2014 - 2:07:12 PM
Last modification on : Monday, January 24, 2022 - 2:07:45 PM


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  • HAL Id : tel-00931304, version 2


Oussoulare Gouba. Approche conjointe de la réduction du facteur de crête et de la linéarisation dans le contexte OFDM.. Autre. Supélec, 2013. Français. ⟨NNT : 2013SUPL0031⟩. ⟨tel-00931304v2⟩



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