光载无线通信链路拉格朗日乘子线性度优化

doi:10.12263/DZXB.20201386

电子学报 ›› 2021, Vol. 49 ›› Issue (10): 1927-1933.DOI: 10.12263/DZXB.20201386

所属专题：无线光通信及其组网技术

• 无线光通信及其组网技术 • 上一篇下一篇

光载无线通信链路拉格朗日乘子线性度优化

樊养余, 王武营, 刘曦春

西北工业大学电子信息学院, 陕西西安 710072

收稿日期:2020-12-03 修回日期:2021-01-25 出版日期:2021-11-30
- 作者简介:
- 樊养余男，1960年生，陕西蓝田人.现为西北工业大学电子信息学院教授、博士生导师.主要研究方向为光通信、图像处理、模式识别和虚拟现实.E-mail:fan_yangyu@nwpu.edu.cn
  王武营男，1980年生,河南新乡人.现为西北工业大学电子信息学院博士研究生.主要研究方向为光载无线通信技术、微波光子雷达信号产生和处理.E-mail:mynaw@163.com
  刘曦春男，1997年生,陕西铜川人.现为西北工业大学电子信息学院硕士研究生.主要研究方向为雷达信号处理、机器学习.E-mail:lxc0205@mail.nwpu.edu.cn

Linearity Optimization of Lagrange Multiplier for Radio-Over-Fiber Link

FAN Yang-yu, WANG Wu-ying, LIU Xi-chun

School of Electronics and Information, Northwestern Polytechnical University, Xi’an, Shan xi 710072, China

Received:2020-12-03 Revised:2021-01-25 Online:2021-11-30 Published:2021-10-25

摘要/Abstract

摘要：

非线性失真是影响光载无线通信链路无杂散动态范围和工作带宽的主要因素.通过结合射频功率比、偏振复用和偏置控制技术，针对分布式天线系统，构建了一种大动态范围和跨倍频程带宽多通道光载无线通信链路.利用拉格朗日乘子法对所提链路进行线性度优化建模，得到了射频输出功率、偏振入射角和射频功率比之间的最佳折衷，从而在抑制三阶交调失真和二阶谐波失真的基础上，实现了链路线性度的最优化.仿真和实验结果验证了所提方案的有效性和可行性.

关键词: 光载无线通信, 分布式天线系统, 拉格朗日乘子法, 线性度优化

Abstract:

Nonlinear distortion is identified as a major factor affecting the operating bandwidth and spurious-free dynamic range (SFDR) of radio-over-fiber link. Combining with the RF power ratio, polarization multiplexing and bias control techniques, a multi-channel radio-over-fiber link with high dynamic range and octave-spanning bandwidth is constructed for distributed antenna system (DAS). A model of linearity optimization for the proposed link is developed using a Lagrange multiplier method optimization model, and the best trade-off among RF output power, polarization incident angle and RF power ratio can be obtained. Thus, the optimization of link linearity can be achieved on the premise that the third-order intermodulation distortion (IMD3) and second-order harmonic distortion (HD2) are suppressed simultaneously. The simulated and experimental results show the proposed scheme is effective and feasible.

Key words: radio-over-fiber, distributed antenna system, Lagrange multiplier method, linearity optimization

中图分类号:

TN929.11

樊养余, 王武营, 刘曦春. 光载无线通信链路拉格朗日乘子线性度优化[J]. 电子学报, 2021, 49(10): 1927-1933.

FAN Yang-yu, WANG Wu-ying, LIU Xi-chun. Linearity Optimization of Lagrange Multiplier for Radio-Over-Fiber Link[J]. Acta Electronica Sinica, 2021, 49(10): 1927-1933.

图/表 5

图1 可用于分布式天线系统的多通道光载无线通信链路

图4 二阶和三阶无杂散动态范围

图5 邻信道功率比

图6 测量的宽带信号频谱、星座图及眼图

图7 仿真（红色实线）和测量（蓝色实线）的归一化射频输出功率与射频功率比的关系

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光载无线通信链路拉格朗日乘子线性度优化

Linearity Optimization of Lagrange Multiplier for Radio-Over-Fiber Link

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