一种基于直接判决的OFDM快衰落信道估计新方法

Channel Estimation Method Based on Decision Directed Technique for OFDM WLANS

摘要:

为了解决正交频分复用（Orthogonal Frequency-Division Multiplexing，OFDM）无线局域网信道估计和跟踪问题，采用直接判决算法进行信道估计，并从中选择可靠的估计结果，结合导频信号进行信道跟踪。将基于训练序列的信道估计结果作为直接判决算法的初始值，利用传输信号直接判决的统计特性进行信道估计，并利用改进的导频算法进一步跟踪信道在时间上的变化。Simulink仿真结果表明，该算法优于基于导频的信道估计方法和基于训练序列的信道估计方法。

Abstract:

A channel estimation method based on decision directed technique and pilot tracking for OFDM WLANS with mobUe terminals is proposed in this paper. The result of training sequence based estimation is used as the initialization of decision directed techniqu