Performance evaluation of hybrid ACE-PTS PAPR reduction techniques

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is widely used in high data rate wireless applications, due to its ability to mitigate frequency selectivity. However, OFDM suffers from high Peak-to-Average Power Ratio (PAPR) problem. In literature, there are various PAPR reduction techniques among them only; Active Constellation Extension (ACE), Tone Reservation based on Null Subcarriers (TRNS), and Partial Transmit Sequence (PTS) whose can work as downward-compatible techniques, i.e. receivers doesnt have to be modified. Generally, PAPR reduction techniques are required to have downward compatibility, no data rate loss, no Side Information (SI), small computational complexity, and large PAPR reduction gain. However, no one of them has all these requirements and no PAPR reduction technique can be considered as the best among others. Thus, recent trend in this field is to make hybridization between different PAPR reduction techniques in one scheme, to gain the advantages of two or more conventional techniques. In literature, there are plenty of hybrid PAPR reduction techniques. Among them, only hybrid ACE- PTS that has downward compatibility, however its downward compatibility depends on channel estimation and the used application. In this paper we propose hybrid ACE- TRNS that is downward compatible technique regardless the used application and independent of channel estimation. Results showed that, for different modulation schemes, ACE- TRNS has PAPR reduction performance better than that of ACE-PTS, with less computational complexity.