Optimal Design of Mobile Fronthaul Delta-Sigma Modulator based on Search Algorithm

WU Zi-qiang; ZHONG Lin-sheng; TAN Da-yong; YANG Qi

doi:10.13756/j.gtxyj.2022.02.013

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Optimal Design of Mobile Fronthaul Delta-Sigma Modulator based on Search Algorithm

更新时间：2022-06-15

- Optimal Design of Mobile Fronthaul Delta-Sigma Modulator based on Search Algorithm
- Study on Optical Communications Issue 2, Pages: 61-68(2022)
- 作者机构：
  
  华中科技大学　光学与电子信息学院，武汉　430074
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2022.02.013
  CLC： TN929
- Published：10 April 2022，
  
  Received：04 June 2021，
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WU Zi-qiang, ZHONG Lin-sheng, TAN Da-yong, et al. Optimal Design of Mobile Fronthaul Delta-Sigma Modulator based on Search Algorithm. [J]. Study on Optical Communications (2):61-68(2022)
DOI：

WU Zi-qiang, ZHONG Lin-sheng, TAN Da-yong, et al. Optimal Design of Mobile Fronthaul Delta-Sigma Modulator based on Search Algorithm. [J]. Study on Optical Communications (2):61-68(2022) DOI： 10.13756/j.gtxyj.2022.02.013.

摘要

针对目前移动前传中使用的通用公共无线电接口(CPRI)技术频谱效率不高的问题，文章提出使用Delta-Sigma调制(DSM)技术作为一种新的前传接口。另外，针对高阶稳定Delta-Sigma调制器参数搜寻中计算复杂度过高问题，使用遗传算法对所使用的四阶Delta-Sigma调制器的结构参数进行了搜索优化，并将该优化结构参数下的仿真结果与原结构参数下的仿真结果进行了比较。在1 bit量化的情况下，使用优化参数的Delta-Sigma调制器增大系统传输容量的同时，平均误差向量幅度(EVM)从0.031下降到0.028；在2 bit量化的情况下，平均EVM从0.013下降到0.011。

Abstract

The Common Public Radio Interface (CPRI) used in mobile fronthaul has low spectrum efficiency. In this paper

we propose to use Delta-Sigma Modulation (DSM) technology as a new fronthaul interface. In addition

to solve the problem of high computational complexity in the parameter searching of high-order stable Delta-Sigma modulator

Genetic Algorithm (GA) is used to search and optimize the structural parameters of the fourth-order Delta-Sigma modulator. The simulation results under the optimized structural parameters are compared with those under the original structural parameters. Under the condition of 1 bit quantization

the Delta-Sigma modulator with optimized parameters increases the transmission capacity of the system while the average Error Vector Magnitude (EVM) decreases from 0.031 to 0.028. In the case of 2 bit quantization

the average EVM decreases from 0.013 to 0.011.

关键词

遗传算法Delta-Sigma调制器移动前传

Keywords

genetic algorithmDelta-Sigma modulatormobile fronthaul

references

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Xu M, Lu F, Wang J, et al. Key Technologies for Next-Generation Digital RoF Mobile Fronthaul with Statistical Data Compression and Multiband Modulation[J]. Journal of Lightwave Technology, 2017, 35(17): 3671-3679.

Ji H, Sun C, Shieh W. On the Bandwidth Efficiency of Analog and Digital RoF for Mobile Fronthaul Transmission Link[C]//45th European Conference on Optical Communication (ECOC 2019). Dublin, Ireland: IET, 2019: 1-3.

Wang J, Yu Z, Ying K, et al. Digital Mobile Fronthaul based on Delta-Sigma Modulation for 32 LTE Carrier Aggregation and FBMC Signals[J]. Journal of Optical Communications and Networking, 2017, 9(2): A233-A244.

Yan S, Sánchez-Sinencio E. A Continuous-Time Sigma-Delta Modulator with 88 dB Dynamic Range and 1.1 MHz Signal Bandwidth[J]. IEEE Journal of Solid-State Circuits, 2004, 39(1): 75-86.

Arnaldi I. Design of Sigma-Delta Converters in MATLAB®/Simulink[M]. Cham, Switzerland: Springer, 2019.

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