A peak-to-average power ratio reduction algorithm for OTFS systems in satellite-to-ground scenarios

SONG Qiangjian; CHEN Yumeng; ZHU Lidong

doi:10.11959/j.issn.1000-0801.2025132

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A peak-to-average power ratio reduction algorithm for OTFS systems in satellite-to-ground scenarios

Topic: Satellite-ground integrated mobile communication and satellite Internet | 更新时间：2025-06-03

- A peak-to-average power ratio reduction algorithm for OTFS systems in satellite-to-ground scenarios
- Telecommunications Science Vol. 41, Issue 5, Pages: 60-71(2025)
- 作者机构：
  
  电子科技大学通信抗干扰全国重点实验室，四川成都 611731
- 作者简介：
- 基金信息：
  
  The National Natural Science Foundation of China(62371098)
- DOI：10.11959/j.issn.1000-0801.2025132
  CLC： TN929.5
- Received：16 January 2025，
  
  Revised：2025-04-29，
  
  Published：20 May 2025
- 稿件说明：
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宋强健,陈雨濛,朱立东.星地场景下OTFS系统的一种峰均比抑制算法[J].电信科学,2025,41(05):60-71.

SONG Qiangjian,CHEN Yumeng,ZHU Lidong.A peak-to-average power ratio reduction algorithm for OTFS systems in satellite-to-ground scenarios[J].Telecommunications Science,2025,41(05):60-71.
宋强健,陈雨濛,朱立东.星地场景下OTFS系统的一种峰均比抑制算法[J].电信科学,2025,41(05):60-71. DOI： 10.11959/j.issn.1000-0801.2025132.

SONG Qiangjian,CHEN Yumeng,ZHU Lidong.A peak-to-average power ratio reduction algorithm for OTFS systems in satellite-to-ground scenarios[J].Telecommunications Science,2025,41(05):60-71. DOI： 10.11959/j.issn.1000-0801.2025132.

摘要

正交时频空（orthogonal time frequency space，OTFS）调制在高多普勒环境下可实现可靠通信，适用于卫星通信等高动态场景。然而，其峰值与平均功率比（peak-to-average power ratio，PAPR）易超出功放线性范围，导致非线性失真。部分传输序列（partial transfer sequence，PTS）算法通过对数据符号分块再选取合适的旋转因子可以抑制PAPR。为提高PTS算法抑制PAPR的能力，提出了一种基于改进的灰狼优化（improved grey wolf optimizer，IGWO）算法的PTS算法，即IGWO-PTS算法，以适应离散组合优化问题并获得更优的子块划分方案，从而获得更好的PAPR抑制能力。推导证明了当相位旋转因子集合元素具有旋转对称性时，相位旋转因子组合空间可以收缩为原来的

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2.70933342

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4.48733330

（

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2.28600001

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2.45533323

为集合中元素个数），极大程度上降低了系统复杂度。仿真实验表明，IGWO-PTS算法相对于传统算法具有更好的PAPR抑制性能，并且在星地高动态场景下可以保持良好的传输可靠性。

Abstract

Orthogonal time frequency space (OTFS) modulation is shown to enable reliable communication in high-Doppler environments

making it suitable for high-mobility scenarios such as satellite communication. However

its high peak-to-average power ratio (PAPR) often exceeded the linear range of power amplifi

ers

causing nonlinear distortion. The partial transmit sequence (PTS) algorithm was utilized to mitigate PAPR by dividing data symbols into subblocks and selecting appropriate phase rotation factors. To enhance the PAPR suppression capability of the PTS algorithm

an improved grey wolf optimizer-based PTS algorithm

termed IGWO-PTS

was proposed to address the discrete combinatorial optimization problem

achieving a more optimal subblock partitioning scheme and better PAPR reduction. It was mathematically provened that when the elements of the phase rotation factor set exhibited rotational symmetry

the phase rotation factor combination space could be reduced to

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2.70933342

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4.48733330

of its original size (where

denotes the number of set elements)

resulting in significant reduction in system complexity. Simulation results demonstrate that the IGWO-PTS algorithm outperformes traditional methods in PAPR reduction，maintaines reliable transmission in high-mobility satellite-to-ground scenarios.

关键词

Keywords

references

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