Section: New Results

Activities on Waveform Design for Telecommunications

Peak to Average Power Ratio (PAPR), Orthogonal Frequency Division Multiplexing (OFDM), Generalized Waveforms for Multi Carrier (GWMC), Adaptive Wavelet Packet Modulation (AWPM)

Characterizing and designing multi-carrier waveform systems with optimum PAPR

Participant : Rémi Gribonval.

Main collaboration: Marwa Chafii, Jacques Palicot, Carlos Bader (Equipe SCEE, Supelec, Rennes)

In the context of the TEPN (Towards Energy Proportional Networks) Comin Labs project (see Section 9.1.1.2), in collaboration with the SCEE team at Supelec (thesis of Marwa Chafii [64], defended in October this year and co-supervised by R. Gribonval), we investigated a problem related to dictionary design: the characterization of waveforms with low Peak to Average Power Ratio (PAPR) for wireless communications. This is motivated by the importance of a low PAPR for energy-efficient transmission systems. A first stage of the work consisted in characterizing the statistical distribution of the PAPR for a general family of multi-carrier systems, leading to a journal paper [67] and several conference communications [65], [66]. Our characterization of waveforms with optimum PAPR [68] has been published in a journal this year [14]. The work this year has concentrated on designing new adaptive multi-carrier waveform systems able to cope with frequency-selective channels while minimizing PAPR. This has given rise to a patent [49] and a journal paper is in preparation.