Séminaire ICI : Rafik Zayani

Titre du séminaire et orateur

Linear Precoding for Energy-Efficient Massive MIMO Downlink.
Rafik Zayani (Sup'Com School, Tunisia)

Date et lieu

Mardi 7 janvier 2019, 14h
ENSEA, salle 384


Massive MIMO, also known as large-scale multi-user (MU) MIMO, has been recognized to be one of the most promising technologies for enhanced spectral- and energy-efficiencies in the future generations of wireless communications. However, massive MIMO precoders exhibit transmit signals with high peak-to-average power ratio (PAPR), regardless of whether single-carrier or multi-carrier transmission and of whether a low or high modulation order is used. Consequently, the nonlinearity of the radio frequency (RF) power amplifier (PA) yields in-band distortion and out-of-band radiation (OBR). Therefore, it is primordial to reduce the PAPR of Massive MIMO generated signals and to reduce the above-mentioned nonlinear distortions to motivate corresponding energy- and cost-efficient massive MIMO BS deployments. In my talk, I will present two downlink transmission schemes to deal with PAPR reduction and PA nonlinear cancellation, referred to as PAPR-aware and PA-aware massive MIMO downlink. It is worth mentioning that PAPR-aware and PA-aware precoding schemes are of paramount importance since they have the potential to improve the energy-efficiency while maintaining an excellent transmission quality by exploiting the high-dimensional degrees-of-freedom (DoF) offered by equipping the BS by a large number of antennas.


Rafik ZAYANI (M’09) received the Engineer, M.Sc. and Ph.D. degrees from the Ecole Nationale d’Ingenieurs de Tunis (ENIT) in 2003, 2004, and 2009, respectively. He was with the Laboratory of Communications Systems (Sys’Com), ENIT, from 2003 to 2005. Since 2005, he has been with the Innov’COM laboratory, Sup’Com School, Tunisia. From 2004 to 2009, he had been with the Department of Telecommunication and Networking, Institut Supérieur d’Informatique (ISI), Tunis, as a contractual Assistant Professor. Since 2009, he has been an Associate Professor (tenure position) with the ISI, Tunisia. Since 2010, he has been an Associate Researcher with the CEDRIC Laboratory, Conservatoire National des Arts et Métiers, France. He is an Established Researcher with long experience in multicarrier communications, energy efficiency enhancement by : transmitter linearization techniques (baseband DPD) and PAPR reduction; high power amplifier characterization; neural network; identification modeling and equalization ; enhanced multicarrier waveforms (MWF);and MIMO technologies. He has contributed in several European (EMPHATIC) and French (WONG5) projects that aim at designing flexible air-interfaces for future wireless communications (5G and Beyond). He has recently been awarded a H2020 Marie Sklodowska-Curie Actions (MSCA) Individual Fellowships (IF) grant for his ADMA5 project proposal.

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