Comparison of Constant Envelope and Peak Insertion Schemes for PAPR Reduction in a 6G Waveform

In this paper, we present a comparison between constant envelope (CE) and peak insertion (PI) schemes for the reduction of the peak-to-average power ratio (PAPR) in multicarrier signal orthogonal frequency division multiplexing with index modulation (OFDM-IM), that was proposed for the sixth-generation wireless networks (6 G). The parameters of the modulation index and the amplitude peak were evaluated, for maximum PAPR reduction, using simulations. A decrease of 7.6 dB is found for the constant envelope scheme for a index modulation of 0.1, which is 0.45 dB more than the peak insertion scheme when the gain of amplitude peak was 200. However, the latter requires a very high power increase over OFDM-IM to achieve this level of reduction. This makes the constant envelop scheme suitable for future green wireless networks.

I. Introduction

Over the last decade, the exponential growth of data traffic, the proliferation of connected devices, and the increasing number of users expecting fast and seamless connectivity anytime, anywhere, have driven demand for emerging technologies such as 6th generation (6G) networks, which promises significantly faster connection speeds and enhanced capacity to handle large volumes of data [1]. By 2030, the volume of traffic per subscription is estimated to be month globally, underscoring the importance of adapting networks to meet the needs of an ever-expanding user base [2].