北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (3): 573-582.doi: 10.13700/j.bh.1001-5965.2016.0247

• 论文 • 上一篇    下一篇

一种基于迭代的多音干扰消除方案

王鑫1, 张晓林1, 曹晏波2   

  1. 1. 北京航空航天大学 电子信息工程学院, 北京 100083;;
    2. 大唐电信科技产业集团, 北京 100191
  • 收稿日期:2016-03-30 出版日期:2017-03-20 发布日期:2016-06-12
  • 通讯作者: 张晓林,E-mail:zxl202@vip.163.com E-mail:zxl202@vip.163.com
  • 作者简介:王鑫,男,博士研究生。主要研究方向:无线通信技术。;张晓林,男,博士,教授,博士生导师。主要研究方向:移动通信、地面数字电视系统、集成电路、飞行遥控遥测、卫星导航。

A multi-tone interference cancellation scheme based on iteration

WANG Xin1, ZHANG Xiaolin1, CAO Yanbo2   

  1. 1. School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Datang Telecom Technology & Industry Group, Beijing 100191, China
  • Received:2016-03-30 Online:2017-03-20 Published:2016-06-12

摘要: 针对正交频分复用技术(OFDM)系统的多音干扰,本文提出先通过增加频域分辨率进行多音干扰识别,再基于迭代运算逐个对多个单音干扰进行参数估计、重构和消除的方案。其中,在多音干扰识别阶段,使用ZoomFFT技术以提高频域分辨率并简化计算复杂度。然而,ZoomFFT后的降采样序列点数不一定满足2的整数次幂,对于单音干扰参数估计,此时可采用经典的基于离散傅里叶变换(DFT)的最大似然参数估计(DFT-MLE),但当采样点数太大时,DFT运算将带来很大的实现复杂度。本文在基于DFT-MLE算法基础上给出一种基于快速傅里叶变换(FFT)的单音参数估计法FFT-MLE,不仅简化了运算复杂度,而且相比DFT-MLE其估计性能有更好的鲁棒性。最后的仿真结果说明了该多音干扰消除方案的有效性。

关键词: 多音干扰识别, 多音干扰消除, 基于FFT-MLE的单音参数估计, ZoomFFT, 正交频分复用技术(OFDM)

Abstract: For multi-tone interference in orthogonal frequency division multiplexing (OFDM) system, one scheme is proposed, which first increases frequency domain resolution of multi-tone interference identification, and then performs parameter estimation, reconstruction and elimination on several single-tone interference one by one based on iterative computation. In multi-tone interference identification stage, ZoomFFT technology is used to improve the frequency domain resolution and simplify the computational complexity. However, down sampling sequence number after ZoomFFT does not meet the n power of 2. For single-tone interference parameters estimation, the classical maximum likelihood parameter estimation based on DFT (DFT-MLE) can be used. But when the number of sampling points is too large, DFT operation will bring great implementation complexity. Based on DFT-MLE, this paper presents an FFT based single-tone parameters estimation FFT-MLE. It not only reduces the computational complexity, but also provides better robustness on estimation performance compared with DFT-MLE. The simulation results show that this multi-tone interference cancellation scheme is effective.

Key words: multi-tone interference identification, multi-tone interference cancellation, single-tone parameter estimation based on FFT-MLE, ZoomFFT, orthogonal frequency division multiplexing (OFDM)

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