中文摘要：

提出一种适用于正交频分复用（Orthogonal frequency division multiplexing,OFDM）系统的低复杂度信道时域响应估计算法。在发送端,算法基于最小均方误差（Mean-square error,MSE）准则以及给定的导频分布对导频功率及相位进行设计;在接收端,算法直接对接收到的导频符号进行求和,通过对求和结果进行简单加权后得到信道时域响应的估计。由于该算法在估计信道时只需进行很少量的复数乘法运算,因此接收端的计算复杂度非常低。理论分析与仿真结果表明,当信道时不变或慢时变时,该算法具有较小的估计均方误差。

英文摘要：

A low-complexity channel estimation method for orthogonal frequency division multiplexing（OFDM） systems is proposed.At the receiver,the power and phases of the pilots are designed based on the minimum mean-square error（MSE） criteria and the given pilot placement.At the receiver,the estimation of the channel impulse response is obtained by directly adding the received pilots and then multiplying the sum by a weighted factor.Since only a small number of complex multiplications are needed in the estimation,the computational complexity at the receiver is very low.Theoretical analysis and simulation results show that,when the channel is time-invariant or slowly time-varying,the method has a relatively small estimation MSE.