PAPR Reduction of OFDM Through Pilot Shifting

TL;DR

This paper introduces a novel pilot shifting method for OFDM that reduces PAPR by about 1.5 dB without needing side information, maintaining spectral efficiency and low complexity.

Contribution

The paper proposes a new PAPR reduction technique based on shifting pilot locations, with a pilot detection algorithm that does not require side information.

Findings

Achieves approximately 1.5 dB PAPR reduction.

Pilot detection accuracy ranges from 80% to 99% at 0 dB SNR.

Maintains spectral efficiency and low complexity.

Abstract

Peak to Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) is a long-standing problem which has been hindering its performance for decades. In this paper, we propose a new PAPR reduction scheme based on shifting pilot locations among the data symbols. Since no side information is sent to the receiver about the pilot locations, a novel pilot detection algorithm is devised here exploiting the pilot power and the relative constant distance property of pilots. The proposed scheme attains around 1.5 dB PAPR reduction. The pilot detection accuracy is shown to be very excellent ranging from 80% to 99% at 0 dB of Signal to Noise Ratio (SNR) in different parameters. This scheme is very spectrally efficient with reduced complexity without degrading BER performance significantly