一种时频结合的中导码信道估计算法

为解决高速移动环境下时变信道的估计问题, 基于改进的COST207 RA信道模型, 提出了一种适用于高铁列车的时频结合的中导码信道估计算法。该算法将中导码和导频在Kalman滤波器中进行有机结合, 充分利用两者在时间和频率上进行信道估计的优势而进行联合估计, 最后得到信道的整合估计值。同时, 由于中导码的插入, 还解决了Kalman滤波信道估计中误差扩散问题。仿真结果表明, 基于中导码的信道估计算法在终端移动速度较高时能显著改善估计性能、提高信道估计的准确度。

Time-frequency combination channel estimation algorithm based on midamble

To solve time-varying channel estimation question in the high mobility environment, this paper proposed a time-frequency combination channel estimation algorithm based on midamble, which was suitable for this environment, based on the improved COST207 RA channel model. The algorithm combined midamble with pilot effectively in the Kalman filter. It achieved the integrated estimation value by joint estimation, applying their advantages of channel estimation in time and frequency fully. Meanwhile, it settled the error diffusion problem of channel estimation method based on Kalman filter due to the insertion of midamble. Simulation results show that, when the movement speed of terminal is higher, the channel estimation algorithm based on midamble can improve estimation performance obviously, and enhance channel estimation accuracy.