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应用科学学报 ›› 2012, Vol. 30 ›› Issue (2): 135-140.doi: 10.3969/j.issn.0255-8297.2012.02.005

• 论文 • 上一篇    下一篇

MIMO信号调制方式盲识别

张路平， 王建新   

  1. 南京理工大学电子工程与光电技术学院，南京210094
  • 收稿日期:2011-03-18 修回日期:2011-06-29 出版日期:2012-03-26 发布日期:2012-03-30
  • 通信作者: 张路平，博士生，研究方向：通信信号的调制识别，E-mail: 1999zlpzy1999@163.com；
  • 作者简介:张路平，博士生，研究方向：通信信号的调制识别，E-mail: 1999zlpzy1999@163.com；王建新，教授，博导，研究方向：雷达与通信信号处理、软件无线电，E-mail: wangjxin@mail.njust.edu.cn

Blind Modulation Recognition for MIMO Signals

ZHANG Lu-ping, WANG Jian-xin   

  1. School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2011-03-18 Revised:2011-06-29 Online:2012-03-26 Published:2012-03-30

PDF

1726

被引次数

21

摘要：

提出一种基于盲信号分离的方法对MIMO信号进行调制识别. 该方法对接收信号的相关矩阵作奇异值分解，用于估算发射天线数目，并对信号进行白化. 采用特征值矩阵的联合近似对角化(joint approximate diagonalisation of eigen-matrices, JADE)算法对接收信号进行分离，恢复发送端信号. 通过分析信号的频谱特征，提出4 个新的特征参数，并结合四阶累积量实现对MIMO体制下6 种信号调制方式的识别. 识别过程中无需估计载波频率和符号率等参数，具有较强的实用性. 仿真结果表明文中提出的方法具有良好的性能.

关键词: 调制识别, 多输入多输出, 盲分离, 谱特征, 四阶累积量

Abstract:

To recognize modulation in MIMO signals, a modulation classification method based on blind source separation is proposed. Singular value decomposition of the received signal’s correlation matrix is used to estimate the number of transmitting antennas and whiten the received signal. The source signal is recovered with joint approximate diagonalisation of eigen-matrices (JADE). Based on analyses of four new spectral features and the fourth-order cumulant, a modulation recognition algorithm is proposed for six kinds of MIMO signals. The method does not need to estimate the carrier frequency and the symbol rate, thus is highly practical. Simulation results show that the proposed method has good performance.

Key words: modulation recognition, multi-input multi-output (MIMO), blind separation, spectrum feature, fourth-order cumulant

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