基于自适应滤波的带内全双工自干扰消除算法
In-Band Full Duplex Self-Interference Elimination Algorithm Based on Adaptive Filtering
李晓辉 1周楠 2石明利 3卫晓博3
作者信息
- 1. 西安电子科技大学广州研究院,广州 510555;西安电子科技大学通信工程学院,西安 710071
- 2. 西安电子科技大学广州研究院,广州 510555
- 3. 西安电子科技大学通信工程学院,西安 710071
- 折叠
摘要
针对带内全双工通信系统中低噪声放大器和模数转换模块的饱和问题以及功率放大器的非线性特性和信号传输的多径效应,提出一种基于自适应滤波的两阶段自干扰消除算法.在此基础上,为了解决传统自适应滤波算法在信道突变时收敛速度较慢的问题,提出一种改进递归最小二乘算法的低复杂度的滤波器初始权值更新方法.仿真实验结果表明,所提算法能够将自干扰信号功率抑制到噪声水平,保证有用信号的正确解调,并且相比于使用传统自适应滤波算法可以有效降低自干扰信号消除所需的时间.
Abstract
In order to solve the saturation problem of low noise amplifier and the analog-to-digital conversion module in in-band full-duplex communication system,the nonlinear characteristics of power amplifier and the multipath effect of signal transmission,a two-stage self-interference elimination algorithm based on adaptive filtering is proposed.On this basis,in order to solve the problem that the traditional adaptive filtering algorithm converges slowly when the channel changes,a low-complexity method for updating the initial weights of a filter in an improved recursive least squares algorithm is proposed.Simulation results show that the proposed algorithm can suppress the power of the self-interfering signal to the noise level,ensure the correct demodulation of useful signals,and effectively reduce the time required for the self-interfering signal elimination compared with the traditional adaptive filtering algorithm.
关键词
带内全双工通信/自干扰消除/自适应滤波Key words
in-band full duplex communication/self-interference cancellation/adaptive filtering引用本文复制引用
基金项目
国家重点研发计划项目(2018YFB1802004)
出版年
2024
NETL
NSTL
万方数据