Low-PAPR condition for 5G-candidate waveforms
Résumé
To meet 5G networks challenges in terms of high data rates
and spectral efficiency, one solution might be using multicarrier
modulations (MCM)s. However, using MCMs is
synonymous with low energy efficiency due to their high
peak-to-average power ratio (PAPR). Indeed, high PAPR
signals drive power amplifiers to operate most of the time
in the linear zone. This latter corresponds to low power efficiency.
This leads to a trade-off between spectral and energy
efficiency. For this reason, PAPR reduction techniques
have been highly addressed in literature. In this work, this
trade-off is addressed differently: a necessary condition
to achieve better PAPR performance than orthogonal frequency
division multiplexing (OFDM) is established. This
theoretical condition is verified by simulation results carried
on Fourier-based and wavelet-based MCMs. The established
condition classifies the MCMs into three categories
regarding the PAPR: same as, higher than and lower
than the OFDM PAPR level.