Power Allocation and Artificial Noise Design of Time-Reversal OFDM System to Enhance Security Performance

LEI Wei-jia; BI Wen-jia; LEI Hong-jiang; TANG Hong

doi:10.12263/DZXB.20220725

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Power Allocation and Artificial Noise Design of Time-Reversal OFDM System to Enhance Security Performance

PAPERS | 更新时间：2025-12-11

- Power Allocation and Artificial Noise Design of Time-Reversal OFDM System to Enhance Security Performance
- ACTA ELECTRONICA SINICA Vol. 52, Issue 5, Pages: 1570-1581(2024)
- 作者机构：
  
  1.重庆邮电大学通信与信息工程学院，重庆 400065
  2.重庆邮电大学移动通信技术重庆市重点实验室，重庆 400065
- 作者简介：
- 基金信息：
  
  Foundation Item(s):　National Natural Science Foundation of China(61971080)
- DOI：10.12263/DZXB.20220725
  CLC： TN918;
- Received：24 June 2022，
  
  Revised：2022-11-17，
  
  Published：25 May 2024
- 稿件说明：
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雷维嘉,毕文佳,雷宏江,等.时间反转OFDM系统中增强安全性能的功率分配与人工噪声设计[J].电子学报,2024,52(05):1570-1581.

LEI Wei-jia, BI Wen-jia, LEI Hong-jiang, et al.Power Allocation and Artificial Noise Design of Time-Reversal OFDM System to Enhance Security Performance[J].Acta Electronica Sinica, 2024, 52(05): 1570-1581.
雷维嘉,毕文佳,雷宏江,等.时间反转OFDM系统中增强安全性能的功率分配与人工噪声设计[J].电子学报,2024,52(05):1570-1581. DOI：10.12263/DZXB.20220725

LEI Wei-jia, BI Wen-jia, LEI Hong-jiang, et al.Power Allocation and Artificial Noise Design of Time-Reversal OFDM System to Enhance Security Performance[J].Acta Electronica Sinica, 2024, 52(05): 1570-1581. DOI：10.12263/DZXB.20220725

摘要

时间反转技术特有的时空聚焦特性使其具有抗窃听能力.本文对提高时间反转正交频分复用系统安全性能的优化方案进行研究.首先，通过应用时间反转预滤波的时空聚焦特性来提高合法接收端相对于窃听端的信号强度；然后，以最大化保密速率为目标对子载波的功率分配进行优化.为进一步提升系统保密传输能力，利用循环前缀提供的自由度实现零空间人工噪声，在对窃听端形成有效干扰的同时，不对合法接收端造成影响.通过对子载波功率分配和人工噪声协方差阵进行联合优化，最大化系统的保密传输速率.仿真结果表明，所提优化方案能显著提高系统的保密速率.

Abstract

Time reversal technology has natural anti-eavesdropping capability due to its unique spatial and temporal focusing capability. In this paper

an optimization scheme to improve the security performance of time reversal OFDM system is studied. Firstly

the temporal and spatial focusing characteristics of time reversal pre-filtering are applied to improve the signal strength of the legitimate receiver relative to the eavesdropper

and then the power of the subcarriers is optimized to maximize the security rate. In order to further improve the secure capability of the system

the zero-space artificial noise is realized by employing the degree of freedom provided by the circular prefix

which can effectively interfere with the eavesdropper

while does not interfere with the legitimate receiver. Then

the subcarrier power and the covariance matrix of the artificial noise are optimized to maximize the security transmission rate. Simulation results show that the proposed scheme can significantly promote the security rate of the system.

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references

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