# Frequency-Selective PAPR Reduction for OFDM

## TL;DR

This paper introduces a flexible PAPR reduction method for OFDM systems that selectively controls clipping noise distribution across different resource blocks, improving signal quality management in modern radio networks.

## Contribution

The paper proposes a novel PAPR reduction technique that allows unequal clipping noise distribution over PRBs, enhancing control over signal quality per user or service.

## Key findings

- Improves PAPR reduction efficiency in OFDM systems.
- Enables selective control of clipping noise over resource blocks.
- Demonstrates effectiveness in 5G NR context.

## Abstract

We study the peak-to-average power ratio (PAPR) problem in orthogonal frequency-division multiplexing (OFDM) systems. In conventional clipping and filtering based PAPR reduction techniques, clipping noise is allowed to spread over the whole active passband, thus degrading the transmit signal quality similarly at all active subcarriers. However, since modern radio networks support frequency-multiplexing of users and services with highly different quality-of-service expectations, clipping noise from PAPR reduction should be distributed unequally over the corresponding physical resource blocks (PRBs). To facilitate this, we present an efficient PAPR reduction technique, where clipping noise can be flexibly controlled and filtered inside the transmitter passband, allowing to control the transmitted signal quality per PRB. Numerical results are provided in 5G New Radio (NR) mobile network context, demonstrating the flexibility and efficiency of the proposed method.