Estimation of Peak-to-Average Power Ratio of Optimal FTN Signals

The development of 5G and 6G networks is impossible without improving spectral efficiency. Faster than Nyquist (FTN) signaling allows increasing symbol rate of transmission and may be applied both to multicarrier and single-carrier signals. However, it leads to uncontrollable intersymbol interference in the time domain. Optimal FTN signaling assumes application of optimal pulses obtained as a solution of an optimization problem and provides controllable intersymbol interference. In this paper, we propose to investigate peak-to-average power ratio (PAPR) of single-carrier optimal FTN signals obtained with the constraint on the minimum Euclidean distance. Comparison with FTN signals based on root-raised-cosine pulses shows that optimal FTN signals provide the gain in PAPR about 2 dB at the same bit rate.

I. Introduction

At the present time 5G broadband access networks are actively developing [1]–[4]. The working on the basis of 6G networks has also started. This development direction is associated with improving spectral efficiency [5]–[7], where R is the symbol rate of transmission, – occupied frequency bandwidth defined in accordance with the one or another criterion. It is worth noting that researchers look for the ways of improving spectral efficiency both for single-carrier [5] - [6] and multicarrier signals [7] - [8].