基于迭代变步长LMS的数字域自干扰对消

刘建成; 全厚德; 赵宏志; 唐友喜

doi:10.3969/j.issn.0372-2112.2016.07.002

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基于迭代变步长LMS的数字域自干扰对消

学术论文 | 更新时间：2025-07-16

- 基于迭代变步长LMS的数字域自干扰对消
- Digital Self-Interference Cancellation Based on Iterative Variable Step-Size LMS
- 电子学报 2016年44卷第7期页码：1530-1538
- 作者机构：
  
  1. 军械工程学院信息工程系,河北,石家庄,050003
  2. 电子科技大学通信抗干扰技术国家级重点实验室,四川,成都,611731
  3. 军械工程学院信息工程系,河北,石家庄,050003
  4. 电子科技大学通信抗干扰技术国家级重点实验室,四川,成都,611731
- 作者简介：
- 基金信息：
  
  国家自然科学基金 (No.61531009,No.61271164,No.61471108,No.61201266,No.61501093);重大专项 (No.2014ZX03003001-002);国家863高技术研究发展计划 (No.2014AA01A704,No.2014AA01A706,No.2015AA01A701);国家电网公司科技项目 (No.SGSCDKJLZJKJ1400099)
- DOI：10.3969/j.issn.0372-2112.2016.07.002
  中图分类号： TN911.72
- 网络出版：2016-07-25，
  
  纸质出版：2016
- 稿件说明：
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刘建成, 全厚德, 赵宏志, 等. 基于迭代变步长LMS的数字域自干扰对消[J]. 电子学报, 2016,44(7):1530-1538.

LIU Jian-cheng, QUAN Hou-de, ZHAO Hong-zhi, et al. Digital Self-Interference Cancellation Based on Iterative Variable Step-Size LMS[J]. Acta Electronica Sinica, 2016, 44(7): 1530-1538.
刘建成, 全厚德, 赵宏志, 等. 基于迭代变步长LMS的数字域自干扰对消[J]. 电子学报, 2016,44(7):1530-1538. DOI： 10.3969/j.issn.0372-2112.2016.07.002.

LIU Jian-cheng, QUAN Hou-de, ZHAO Hong-zhi, et al. Digital Self-Interference Cancellation Based on Iterative Variable Step-Size LMS[J]. Acta Electronica Sinica, 2016, 44(7): 1530-1538. DOI： 10.3969/j.issn.0372-2112.2016.07.002.

摘要

针对同时同频全双工(Co-frequency and Co-time Full Duplex

CCFD)系统已有的数字域干扰对消方法收敛速度慢和对消比低的问题

本文提出了迭代变步长最小均方(Least Mean Square

LMS)算法

利用该算法实现了快速收敛的高对消比数字域干扰对消.首先

改进Logistic函数

缩短其函数值由大至小的变化区间

再利用该非线性函数计算随迭代次数变化的步长因子值

从而加快干扰对消的收敛速度

高精度递推估计自干扰信道参数

即获得高的对消比.最后

理论分析了该对消方法收敛性和计算复杂度

得到了稳态条件下对消比的闭合表达式.仿真表明

该方法与已有变步长LMS对消方法相比

对消比可增加6dB以上

收敛速度可提高1倍

与最小二乘信道估计干扰对消方法相比

对消比提高了至少10dB.

Abstract

Recently

the co-frequency co-time full duplex (CCFD) has been widely studied for its higher spectral efficiency.However

it must avoid the strong co-channel self-interference to put this technology into practice

and the existing digital interference cancellation methods usually have slow convergence and small cancellation-ratio.Considering this obstacle

the digital cancellation method based on iterative variable step-size least mean square algorithm (IVSSLMS) is proposed in this paper.Firstly

the function of Logistic is modified to accelerate its tendency for value changing lower.Then

the iterative variable step-size is obtained through the modified nonlinear function.Consequently

convergence of interference cancellation is speeded up

and accurate parameters of self-interference channel are estimated to achieve high cancellation-ratio is derited.Finally

the convergence and complexity of this digital interference cancellation method are analyzed and the closed expression of steady-state cancellation-ratio is derived.Simulations verify that the cancellation-ratio of this method could achieve more than 6dB and 10dB in comparison with the existing variable step-size LMS methods and cancellation method based on least square channel estimation respectively

and the convergence speed could be enhanced doubled.

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