A DFT-Based Scheme for PAPR Reduction in SR-OFDM Systems

IF 3.4 3区计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Access Pub Date : 2025-04-24 DOI:10.1109/ACCESS.2025.3564160

Haojia Lv

引用次数: 0

Abstract

This paper focuses on the peak-to-average power ratio (PAPR) reduction in symbol repetition-based orthogonal frequency division multiplexing (SR-OFDM) systems, and a discrete Fourier transform (DFT)-based scheme is proposed to reduce the PAPR of SR-OFDM signals. It is demonstrated that an SR-OFDM system exhibits a larger PAPR than a classical orthogonal frequency division multiplexing (OFDM) system because of the signal superposition of multiple branches, although the cyclic prefix (CP) overhead can be reduced in SR-OFDM systems. Besides, it is shown that the high PAPR is mainly because of the inverse DFT operation at the SR-OFDM transmitter. Therefore, a DFT-based scheme is proposed in this paper to compensate for the inverse DFT operation, without requiring side information or causing signal distortion. To verify the proposed scheme, a theoretical analysis is provided for the signal characteristics, and simulation results of the complementary cumulative distribution function are also given, together with the bit error ratio.

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基于dft的SR-OFDM系统PAPR降低方案

针对基于符号重复的正交频分复用（SR-OFDM）系统中峰值平均功率比（PAPR）的降低问题，提出了一种基于离散傅立叶变换（DFT）的降低SR-OFDM信号峰值平均功率比的方法。研究表明，尽管SR-OFDM系统可以降低循环前缀（CP）开销，但由于多个分支的信号叠加，其PAPR比传统的正交频分复用（OFDM）系统要大。此外，研究表明，高PAPR主要是由于SR-OFDM发射机的逆DFT操作造成的。因此，本文提出了一种基于DFT的方案来补偿逆DFT运算，而不需要侧信息或引起信号失真。为了验证所提出的方案，对信号特性进行了理论分析，并给出了互补累积分布函数的仿真结果和误码率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Access COMPUTER SCIENCE, INFORMATION SYSTEMSENGIN-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

9.80

自引率

7.70%

发文量

6673

审稿时长

6 weeks

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