Nonlinear Multicarrier Transmitter System With Signal Clipping: Measurement, Analysis, and Optimization

IF 4 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Systems Journal Pub Date : 2024-03-29 DOI:10.1109/JSYST.2024.3401148

Yuyang Du;Liang Hao;Yiming Lei;Qun Yang;Shiqi Xu

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引用次数: 0

Abstract

Signal clipping is a well-established method employed in orthogonal frequency division multiplexing (OFDM) systems to mitigate peak-to-average power ratio. The utilization of this technique is widespread in electronic devices with limited power or resource capabilities due to its high efficiency and low complexity. While clipping effectively diminishes nonlinear distortion stemming from power amplifiers (PAs), it introduces additional distortion known as clipping distortion. The optimization of system performance, considering both clipping distortions and the nonlinearity of PAs, remains an unresolved challenge due to the intricate modeling of PAs. In this article, we undertake an analysis of PA nonlinearity utilizing the Bessel–Fourier PA model and simplify its power expression through intermodulation product analysis. We mathematically derive expressions for the receiver signal-to-noise ratio and system symbol error rate (SER) for nonlinear clipped OFDM systems. Using these derivations, we explore the optimal system configuration required to achieve the lower bound of SER in practical OFDM systems, taking into account both PA nonlinearity and clipping distortion. The results and methodologies presented in this article contribute to an improved comprehension of system-level optimization in nonlinear OFDM systems employing clipping technology.

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带信号削波的非线性多载波发射机系统：测量、分析和优化

信号削波是正交频分复用（OFDM）系统中的一种成熟方法，用于降低峰均功率比。由于效率高、复杂度低，这种技术在功率或资源能力有限的电子设备中得到广泛应用。虽然削波能有效减少功率放大器（PA）产生的非线性失真，但它会带来额外的失真，即削波失真。由于功率放大器的建模复杂，同时考虑削波失真和功率放大器非线性的系统性能优化仍是一个尚未解决的难题。在本文中，我们利用贝塞尔-傅里叶功率放大器模型对功率放大器的非线性进行分析，并通过互调乘积分析简化其功率表达式。我们用数学方法推导出非线性削波 OFDM 系统的接收器信噪比和系统符号错误率 (SER) 的表达式。利用这些推导，我们探索了在实际 OFDM 系统中实现 SER 下限所需的最佳系统配置，同时考虑了功率放大器非线性和削波失真。本文介绍的结果和方法有助于更好地理解采用削波技术的非线性 OFDM 系统的系统级优化。

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 Systems Journal 工程技术-电信学

CiteScore

9.80

自引率

6.80%

发文量

572

审稿时长

4.9 months

期刊介绍： This publication provides a systems-level, focused forum for application-oriented manuscripts that address complex systems and system-of-systems of national and global significance. It intends to encourage and facilitate cooperation and interaction among IEEE Societies with systems-level and systems engineering interest, and to attract non-IEEE contributors and readers from around the globe. Our IEEE Systems Council job is to address issues in new ways that are not solvable in the domains of the existing IEEE or other societies or global organizations. These problems do not fit within traditional hierarchical boundaries. For example, disaster response such as that triggered by Hurricane Katrina, tsunamis, or current volcanic eruptions is not solvable by pure engineering solutions. We need to think about changing and enlarging the paradigm to include systems issues.