基于LTE的导频信道估计研究

Research on LTE-based Pilot-symbol-aided Channel Estimation Algorithm

正交频分复用(OFDM,Orthogonal Frequency Division Multiplexing)技术是长期演进(LTE,Long Term Evolution)的核心技术之一。目前,基于导频的信道估计是OFDM系统中信道估计的常用方式。在基于导频的信道估计方式下,结合LS估计算法提出了一种下向插值算法(DWI)。在LTE信道模型及导频结构下,通过MATLAB仿真工具,将该算法和现有各种算法的性能进行了比较和分析。仿真结果表明,使用结合LS估计算法和DWI算法的OFDM系统信道估计机制,具有复杂度低、易于实现的优点。

Orthogonal Frequency Division Multiplexing （OFDM） technology is one of the key technologies for LTE-A. Meanwhile, pilot-symbol-aided channel estimation algorithm is an important method in OFDM system. In combination with LS estimation algorithm based on pilot-symbol-aided channel estimation, a DownWard-Interpolation （DWI） algorithm is proposed. Through MATLAB simulation analysis, the performances of various channel estimation algorithms under the LTE channel model and pilot signal structure are compared. The simulation results show that the proposed algorithm is of low complexity and easy in hardware implementation.