一种改进的基于DCT的信道估计迭代算法  

An Improved DCT-based Iterative Algorithm for Channel Estimation

作　　者：杨柳[1] 刘汉奎[1] 郝希准[1] 边刚[1] 

机构地区：[1]西华师范大学物理与电子信息学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2011年第1期67-70,共4页Journal of China West Normal University(Natural Sciences)

基　　金：四川省教育厅重点实验室专项基金资助项目(2006ZD026)

摘　　要：提出了一种适用于正交频分复用系统信道估计的基于DCT的改进迭代算法.该算法通过迭代修正传统DCT/IDCT方法估算出的频率响应幅值和相位偏移,能有效抑制加性高斯白噪声和载波间干扰影响.仿真结果表明,与未采用迭代的DCT/EIDCT算法相比,该算法有更好的性能;与采用DCT/EIDCT初始化的迭代算法相比,该算法具有与其几乎相同的性能,但实现更简单;同时,该算法的迭代次数可通过在初始化过程中引入幅值补偿而大大减少.An improved DCT-based iterative algorithm is proposed to implement the channel estimation in orthogonal frequency division multiplexing（OFDM） system.It can significantly reduce the effects of additive white Gaussian noise and inter-carrier interference on the channel estimation since the amplitude and phase offset of obtained channel frequency response are modified through the DCT/IDCT iterations.The simulation results show that the improved DCT-based iterative algorithm performs better than the DCT/EIDCT algorithm without iterations.Furthermore,it has equivalent performance as the DCT/EIDCT algorithm with iterations,but its implement is simpler than the latter.In addition,the iteration times can be significantly decreased through introducing the amplitude compensation at initial stage.

关 键 词：正交频分复用 信道估计 离散余弦变换 迭代算法 

分 类 号：TN919[电子电信—通信与信息系统]