文献类型：期刊文献

中文题名：基于波达方向的Steiner多天线信道估计算法

英文题名：Improved Steiner Multiple Antenna Channel Estimation Algorithm by Direction of Arrival

作者：卢照敢[1];杨永强[1];马小飞[1];刘龙[2]

第一作者：卢照敢

机构：[1]河南财经政法大学计算机与信息工程学院;[2]西安理工大学自动化与信息工程学院

第一机构：河南财经政法大学计算机与信息工程学院

年份：2013

卷号：40

期号：5

起止页码：74-77

中文期刊名：计算机科学

外文期刊名：Computer Science

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：河南省科技厅基础与前沿技术研究计划项目(122300410380);河南省教育厅科学技术研究重点项目(12A510001);陕西省教育厅产业化培育项目(2012JC19);西安市技术转移促进工程重大项目(CX12166)资助

语种：中文

中文关键词：多天线;OFDM;信道估计;波达方向

外文关键词：Multiple antenna; OFDM; Channel estimation; Direction of arrival

摘要：针对多天线OFDM系统中时域信道训练符号采用非正化的数字序列而导致其矩阵求逆运算计算复杂度高的问题,采用多用户CDMA系统上行链路的信道训练符号设计方法,提出了多天线Steiner信道估计方法。该方法通过时域途径设计的训练符号,使所有发射天线的训练符号矩阵成为一个循环矩阵,从而接收机可用离散傅立叶变换矩阵进行对角化,避免了信道估计矩阵求逆运算。同时,根据Steiner初始信道估计分离出每条路径的有用信息,再用每条路径的空间冲激响应来估计该路径信号的波达方向(Direction of Arrival,DOA),去除天线间接收信号的相干性,有效地利用空间信息提高Steiner信道估计的精度。实验结果表明,通过估计接收信号在每个接收天线上的波达方向角,基于波达方向的Steiner估计算法,在QPSK调制模式下获得了近0.5dB的性能提升,而在16QAM调制方式下可获得近2dB的信噪比增益。
In the multiple antenna OFDM systems,the non-orthogonal training sequences are usually used as the chan- nel training sequences, which would lead to the matrix inversion operation with great complexity during the channel es- timation process. So, the training symbols in multi-user CDMA uplinks was used for time channel training symbols in the multiple antenna OFDM systems, and the multiple antenna spatial channels could be evaluated according to the clas- sical Steiner channel estimation algorithrra In fact, the training symbol matrix in transmit antenna is one circular matrix, which could be diagonalized by discrete Fourier transformation at receiver antenna, and the matrix inversion operation could also be avoided. Furthermore, based on the initial estimation results of Steiner algorithm, one could obtain the di- rection of arrival （DoA） for incidence waves at different multiple receiver antenna. These DoA information is further used to improve the Steiner algorithm. Numerical results show that the improved Steiner algorithm with DoA could ob- tain 0. 5dB SNR improvement with QPSK modulation and 2dB SNR improvement with 16QAM modulation, when com- pared to that of original Steiner method.