基于改进子载波预留算法的正交频分复用信号峰均比抑制方法研究

刘子威; 杨彪; 赵珊珊; 杜鸿飞

doi:10.11999/JEIT230475

基于改进子载波预留算法的正交频分复用信号峰均比抑制方法研究

doi: 10.11999/JEIT230475

南京邮电大学南京 210023

基金项目: 国家自然科学基金(61801233)，国防科技重点实验室基金(JKW202209)

详细信息

作者简介:
刘子威：男，副教授，研究方向为雷达信号处理、雷达自适应抗干扰技术和阵列信号处理

杨彪：男，硕士生，研究方向为雷达信号处理

赵珊珊：女，副教授，研究方向为雷达信号处理、雷达自适应抗干扰技术和阵列信号处理

杜鸿飞：男，硕士生，研究方向为雷达信号处理

通讯作者:
赵珊珊　zhaoshanshan025@163.com

中图分类号: TN95
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-23
- 修回日期: 2023-12-07
- 网络出版日期: 2023-12-14
- 刊出日期: 2024-04-24

Research on Peak to Average Power Ratio Suppression Method of Orthogonal Frequency Division Multiplexing Signal Based on Improved Tone Reservation Algorithm

Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Funds: The National Natural Science Foundation of China (61801233), The Science and Technology Foundation of State Key Laboratory (JKW202209)

摘要

摘要: 由于系统对线性元器件的要求非常严格，导致目前正交频分复用(OFDM)系统产生峰值平均功率比(PAPR)过高的问题，引起OFDM和基于OFDM的雷达一体化系统的信号失真，影响系统性能。针对该问题，该文提出了基于加权最小二乘法的子载波预留法(TR)。该算法首先将OFDM设计方案中的子载波分为数据子载波和预留的空白子载波，数据子载波调制数据子载波，空白子载波调制空白数据。然后利用原始数据通过加权最小二乘法得到最佳削峰系数和削峰数据，并将削峰数据调制在空白子载波上面。最后将削峰数据叠加到原始数据上，完成PAPR的抑制。仿真表明，基于加权最小二乘法的TR算法能够在1～3次迭代下实现良好的PAPR抑制效果，并且它的收敛速度相比于传统算法有了明显的提高。
- 正交频分复用 /
- 峰值平均功率比 /
- 子载波预留法
Abstract: Due to the very strict requirements of the system for linear components, the current Orthogonal Frequency Division Multiplexing(OFDM) system has the problem of high Peak to Average Power Ratio (PAPR), which causes signal distortion of OFDM and OFDM-based radar integrated system, and affects the system performance. To solve this problem, a Tone Reservation(TR) method based on the weighted least squares method is proposed in this paper. Firstly, the subcarriers in the OFDM design scheme are divided into data subcarriers and reserved blank subcarriers, data subcarriers modulate data subcarriers, and blank subcarriers modulate blank data. Then, the original data is used to obtain the best peak clipping coefficient and peak clipping data through the weighted least squares method, and the peak clipping data is modulated on the blank subcarrier. Finally, the peak shaving data is superimposed on the original data to complete the suppression of PAPR. Simulation results show that the TR algorithm based on weighted least squares method can achieve good PAPR suppression effect in 1 to 3 iterations, and its convergence speed is significantly improved compared with the traditional algorithm.
- Orthogonal Frequency Division Multiplexing(OFDM) /
- Peak to Average Power Ratio (PAPR) /
- Tone Reservation (TR)

HTML全文

图 1 一体化波形频域示意图

下载: 全尺寸图片幻灯片

图 2 基于OFDM子载波分配的雷达通信一体化的子载波分配示意图

下载: 全尺寸图片幻灯片

图 3 基于加权最小二乘法的TR算法下的一体化子载波分配示意图

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图 4 基于加权最小二乘法的TR算法的PAPR抑制效果的CCDF曲线

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图 5 基于加权最小二乘法的TR算法与CC-TR算法的PAPR抑制效果的PAPR的CCDF曲线

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图 6 基于加权最小二乘法的TR算法与LSA-TR算法的PAPR抑制效果的PAPR的CCDF曲线

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图 7 基于加权最小二乘法的TR算法中不同幅度放大系数下的第1次迭代后的PAPR的CCDF曲线

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图 8 基于加权最小二乘法的TR算法中不同空白子载波个数下的第1次迭代后PAPR的CCDF曲线

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表 1 PAPR仿真参数

参数数值

雷达载频 1.5 GHz
信号带宽 1 MHz
信号时宽 64 μs
采样频率 2 MHz
脉冲周期 480 μs
信噪比 20 dB
迭代次数 5

下载: 导出CSV

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