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

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

doi:10.12263/DZXB.20201386

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

OPTICAL WIRELESS COMMUNICATION AND NETWORKING TECHNOLOGY | 更新时间：2025-12-08

- Linearity Optimization of Lagrange Multiplier for Radio-Over-Fiber Link
- ACTA ELECTRONICA SINICA Vol. 49, Issue 10, Pages: 1927-1933(2021)
- 作者机构：
  
  西北工业大学电子信息学院, 陕西西安 710072
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20201386
  CLC： TN929.11;
- Received：03 December 2020，
  
  Revised：2021-01-25，
  
  Published：25 October 2021
- 稿件说明：
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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.
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. DOI： 10.12263/DZXB.20201386.

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. DOI： 10.12263/DZXB.20201386.

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.

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.

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references

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