TD-LTE-A上行信道估计中基于加权的插值算法

TD-LTE-A上行信道估计中的线性插值算法只利用数据两端的两个导频位置的信道响应进行插值，不能很好拟合信道响应。针对此问题，提出了基于加权平均的插值算法。该算法以线性插值算法为基础，首先利用连续3个导频位置的信道响应进行线性插值得到数据位置的两个初步插值结果，再在此基础上引入权值α，最后对初步插值结果进行加权得到数据位置的信道响应。在EPA环境下的MATLAB仿真结果表明，相对于线性插值算法，基于加权的插值算法在不过度增加计算复杂度的情况下能降低系统的误比特率。

A weighted interpolation algorithm for TD-LTE-A uplink channel estimation

In order to address the problem that the linear interpolation algorithm of TD-LTE-A uplink channel estimation uses only two channels responding in pilot positions to interpolate the channel response and failes to fit the channel response well,an interpolation algorithm based on weighted is proposed. The algorithm is based on the linear interpolation algorithm. Firstly,the algorithm uses three consecutive channel responses of pilot positions and the linear interpolation algorithm to obtain two intermediate values and then introduces the weights. Finally,the channel response of data positions is obtained by weighting the intermediate values. In EPA environment,the MATLAB simulation result show that compared with the linear interpolation,this novel algorithm can reduce the bit error rate(BER) of the system without excessively increasing the computation complexity.