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Doctorate thesis defense of Mounira LAABIDI

Doctorate thesis defense on July 16th 2016 at 09H00 AM ,in Amphi I, Sup’Com.

Entitled :PAPR Reduction and HPA non-linear Compensation Techniques for Filter Bank-Based Multi-carrier Modulations Systems (FBMC)

Presented by : Mounira LAABIDI 




Professor, ENIT, Tunis






Professor, Sup’Com, Tunis


M. Mohamed Lassaad AMMARI

Associate Professor, ENISO, Sousse


M. Noureddine HAMDI

Professor, INSAT, Tunis


Thesis Director


Professor, Sup’Com, Tunis



Assistant Professor, ISI, Tunis



The requirements of current wireless and mobile communication applications in terms of high speed and reliability are growing increasingly. Multicarrier Modulation Schemes (MCMs) are a suitable choice to meet these requirements. Although OFDM is the most widespread MCM, its rectangular pulse shape and the Cyclic Prefix (CP) use make it unsuitable for the upcoming 5G applications. The FBMC/OQAM may be an appropriate alternative to the CP-OFDM MCM. FBMC/OQAM is characterized not only by a prototype filter well localized in times and frequency but also with a higher data rate since no CP is used. Unfortunately, these two MCM suffer from high Peak to Average Power Ratio (PAPR). In the presence of a non-linear high power amplifier (HPA), these two MCM signals are exposed to two kinds of distortions: an in-band distortion expressed by an increase in Bit Error Rate (BER) and an out-of-band distortion which may result in Adjacent Channel Interference (ACI).

To compensate the HPA nonlinearities and increase its efficiency, two approaches are proposed in the literature: (i) PAPR reduction schemes and (ii) linearization schemes. These two approaches are conceived and optimized separately. Their combination may impact the overall performance of the MCM system. Some works deal with their joint use for the OFDM signal. Yet, to the best of our knowledge, there have been no research works combining them for the FBMC/OQAM signal.


The main objective of this study revolves around the following considerations. Firstly, we suggest some new PAPR reduction schemes to reduce the PAPR of FBMC/OQAM signal. In fact, the direct application of the existing PAPR reduction schemes, originally conceived for the OFDM, turns out to be ineffective due to the inherent overlapping signal structure of FBMC/OQAM. Secondly, based on predistortion as a linearization scheme, we suggest some approaches to jointly use the proposed PAPR reduction schemes for the FBMC/OQAM and the predistortion. Finally, to evaluate our suggested schemes, their comparison with those of the OFDM system may be fulfilling.


FBMC/OQAM, OFDM, PAPR, HPA non-linearity, Predistortion