为准确掌握信道特性,提出了基于离散椭球基—基扩展模型(Discrete Prolate Spheroidal Sequences-Basis Expansion Model,DPSS-BEM)的OFDM信道估计方法。采用二维DPSS-BEM对信道进行建模,将信道视为二维正交分量的线性加权,并利用导频位置的训练信息估计权值。仿真表明,该方法与基于极值BEM算法、卡尔曼估计法比较,能有效跟踪OFDM信道变化,改善信道的归一化均方误差和误码率性能。

To master the channel characteristics,broadband power line carrier OFDM channel estimation based on DPSS-BEM is proposed, which models power line channel by using two-dimensional DPSS-BEM to regard the power line channel as linear weighting of two-dimensional orthogonal components,then treated the channel variation during OFDM symbol as the variety of weights, and then utilized the training information from pilots method to estimate weights to complete channel estimation. The simulation results show that the method can effectively track the changes of power line channel,obviously improve the normalized mean square error and bit error rate performance.