A Modified Design of ACF Operation for Reducing PAPR of OFDM Signal

TL;DR

This paper proposes a modified amplitude clipping and filtering method to significantly reduce PAPR in OFDM signals used in LTE, with minimal impact on bit error rate and computational complexity.

Contribution

A novel modification of the ACF technique that improves PAPR reduction in OFDM systems with slight BER increase.

Findings

Significant PAPR reduction achieved for QPSK and QAM modulations.

Minimal increase in BER compared to existing methods.

Enhanced suitability for LTE and future wireless systems.

Abstract

Next generation wireless communication technology long term evolution (LTE) has implemented orthogonal frequency division multiplexing (OFDM) technique as a strong candidate for radio access systems. It has several attributes such as providing robustness to multipath fading & impulse noise, eliminating intersymbol interference (ISI), inter carrier interference (ICI) & the need for equalizers. The major challenging issue of OFDM technique is the high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. A trade-off is necessary for reducing PAPR with increasing bit error rate (BER), computational complexity or data rate loss etc. In this paper, a moderately modified design of amplitude clipping & filtering operation (ACF) is proposed and implemented which shows the significant improvement in case of PAPR reduction for both quadrature phase shift keying (QPSK) & quadrature amplitude modulation (QAM) while increasing slight BER match up to to an existing method.