摘要
针对偏移正交幅度调制的正交频分复用(OQAM/OFDM)系统在高频率选择性衰落信道下频域信道估计方法存在的误码平层问题,提出了使用时域信道估计方法对OQAM/OFDM系统进行信道估计。建立了OQAM/OFDM系统时域信道估计模型,通过迭代的方法估计信道的协方差矩阵,得到不需要先验信道协方差矩阵信息的线性最小均方误差(LMMSE)估计方法。仿真结果表明:所提的方法能够有效克服误码平层,且信道估计性能比传统的加权最小二乘(WLS)估计方法有5dB的性能提升,与已知先验信道协方差矩阵信息的LMMSE信道估计方法有相近的性能。
In offset quadrature amplitude modulation/orthogonal frequency division（ OQAM/OFDM） systems,frequency channel estimation method exist error code leveling problem in high frequency selective channel,time domain channel estimation method is proposed. Time domain channel estimation model for OQAM/OFDM systems is set up,the channel covariance matrix is obtained through the iterative method,a linear minimum mean square error（ LMMSE） channel estimation method which needn＇t a priori information of channel covariance matrix is obtained. The simulation result shows that the proposed methods can effectively overcome error code leveling and improve the channel estimation performance to 5 dB compared with the weighted least squares（ WLS） channel estimation and have a close performance with the LMMSE channel estimation method which has a priori information of channel covariance matrix.
作者
薛伦生
陈航
邱上飞
XUE Lun-sheng;CHEN Hang;QIU Shang-fei(School of Marine Science and Technology, Northwestern Polytechnical University, Xi＇ an 710072, China;Air and Missile Defense College, Air Force Engineering University, Xi＇an 710051, China)
出处
《传感器与微系统》
CSCD
2018年第6期11-14,共4页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(61671468)
关键词
正交频分复用
频移正交幅度调制
时域信道估计
线性最小均方误差
orthogonal frequency division multiplexing （OFDM）
offset quadrature amplitude modulation（OQAM）
time domain channel estimation
linear minimum mean square error（LMMSE）
