OFDM系统中基于预编码的时变信道半盲估计方法

讨论了一种适用于时变信道的OFDM系统半盲信道估计方法。该算法以一种基于线性预编码的信道估计技术为基础,利用接收信号的自相关矩阵所包含的信道信息进行信道估计。引入了一个具有单一参数的遗忘多项式,在时变信道下快速获得接收信号的自相关矩阵,使得该算法具有很强的信道跟踪能力。仿真结果表明,在时变多径瑞利衰落信道中,当信道仅在一个OFDM符号时间内保持不变时,该方法仍能够获得较高的信道估计精度和系统误比特率性能。

Time-varying channel semi-blind estimation method based on pre-coding in OFDM system

This paper discusses a method of semi-blind estimation for time-varying channels in OFDM system.Based on pre-coding technology,the algorithm utilizes the channel information included in auto-correlation matrix of received signal to estimate channel.In this paper,a forgetting polynomial with single parameter is introduced to obtain auto-correlation matrix of received signal,so the algorithm has strong ability of channel tracking.The simulation results show that in time-varying multi-path Rayleigh fading channel,the algorithm can obtain high estimation precision and good BER performance when the channel keeps unchanged only in one OFDM symbol interval.