Precoding for PAPR Reduction in UW-OFDM

TL;DR

This paper proposes a novel PAPR reduction technique for UW-OFDM that leverages the generator matrix and the Procrustes method, achieving effective PAPR reduction without additional overhead.

Contribution

It introduces a PAPR reduction method for UW-OFDM using the generator matrix and Procrustes optimization, eliminating the need for extra redundancy.

Findings

Significant PAPR reduction demonstrated in simulations

Method requires only one calculation of the generator matrix per system setting

No additional overhead redundancy needed for PAPR reduction

Abstract

Unique Word Orthogonal Frequency Division multiplexing (UW-OFDM) is a variant of the multicarrier technique that has shown better bit error performance compared to cyclic prefixed (CP-)OFDM. Like other multicarrier techniques, UW-OFDM suffers from the high peak-to-average-power ratio (PAPR) problem, which is an obstacle ahead of practical implementation of UW-OFDM. In this paper, the generator matrix, which is inherent to UW-OFDM, is not only used to create the specific UW-OFDM system, but also to reduce the PAPR. To do so, a suitable optimization problem is developed, and solved using the Procrustes method. The main advantage of the proposed method is that the built-in generator matrix should be calculated only once for each system setting, and the PAPR reduction (PAPR-R) is achieved without any overhead redundancy. Simulation results are provided for evaluating the PAPR-R performance of the proposed method.