伪叠加Zadoff-Chu序列的LTE下行信道估计

分析了正交频分复用系统中基于叠加训练序列的最小二乘和线性最小均方误差信道估计算法,在此基础上针对LTE信道的结构特征,提出了一种利用伪叠加Zadoff-Chu序列进行信道估计的最小二乘算法。该方法可以大大降低算法复杂度,并且不需要信道先验信息、不占用带宽资源。仿真结果验证了该方法的有效性,其性能比频域的离散傅里叶变换算法和线性最小均方误差算法性能更优。

Channel Estimation for LTE Downlink based on Super-imposed Zadoff-Chu Sequence

The LS and LMMSE channel estimation algorithms based on super-imposed sequence in OFDM system are analyzed in this paper.A new LS algorithm based on super-imposed Zadoff-Chu sequence is proposed for channel estimation according to the characteristics of LTE Downlink channels.This algorithm works in time domain,and as compared with DFT and LMMSE algorithms in frequency domain,is of much less complexity,requires no priori information of channels and occupies no bandwidth resources.Simulation results indicate that this algorithm is highly effective and has fairly good performance.