Research on modified selected mapping technique for PAPR reduction and reception performance improvement in 8QAM-OFDM optical access systems

Yufeng Shao,Wenzhe Ma

doi:10.1186/s41476-017-0064-6

Abstract

BackgroundOrthogonal frequency division multiplexing has been regarded as one of the promising technologies for the optical access systems application. However, high peak-to-average power ratio will cause the signal distortion and enable the used amplifier to operate in nonlinear section.MethodsIn this paper, a modified selected mapping technique is introduced for reducing the peak-to-average power ratio and enhancing reception performance of the downstream 8QAM-OFDM signals in optical access systems.ResultsCompared with the traditional selected mapping technique, the PAPR value of 8QAM-OFDM optical downstream signals with 128 subcarriers is reduced by almost 2 dB using modified SLM when the complementary cumulative distribution function probability value is 10−2. Moreover, the bit error rate performance will be improved, while 10Gbit/s 8QAM-OFDM optical downlink signals are transmitted over single mode fiber with different access length.ConclusionsHence, the proposed scheme becomes more efficient for the future optical orthogonal frequency division multiplexing access systems.

Highlights

Orthogonal frequency division multiplexing has been regarded as one of the promising technologies for the optical access systems application
Note that, when the number of subcarriers is 128, the value of peak-to-average power ratio (PAPR) using modified selected mapping (SLM) is reduced almost 2 dB compared with conventional SLM when the complementary cumulative distribution function (CCDF) value is 10−2
As the distance increase, the reception performance of 8QAM-Orthogonal frequency division multiplexing (OFDM) signals using the modified SLM is better than the conventional SLM

Summary

Introduction

Orthogonal frequency division multiplexing has been regarded as one of the promising technologies for the optical access systems application. High peak-to-average power ratio (PAPR) increases complexity of digital-to-analogue (D/A) and analogueto-digital (A/D) converters, and causes signals nonlinear distortion since it makes the power amplifier (PA) work in a non-linear area in optical access systems [2,3,4,5,6,7,8]. SLM method is introduced into generation of (16 quadrature amplitude modulation orthogonal frequency division multiplexing) 16QAMOFDM signals in millimeter wave optical access systems for solving high PAPR problem [11, 12]. A modified SLM technique is introduced for reducing the PAPR and enhancing reception performance of

Methods

Results

Conclusion