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全球微波互联接入(WIMAX,Worldwide Interoperability for Microwave Access)系统采用正交频分复用技术实现无线宽带接入,信道估计是WIMAX系统的关键技术。这里主要研究了WIMAX系统信道估计中的内插算法,包括线性内插、二阶内插、DFT内插、DCT内插和幅度相位内插等算法,分析并比较了不同内插算法在各种SUI信道中对系统性能的影响,仿真结果表明,在视距信道中,二阶内插以及幅度相位内插算法性能较好;在非视距信道中,DCT-Ⅱ内插和二阶内插算法性能较好。综合而言,二阶内插算法以增加适当复杂度的代价在各种信道中均获得了较好的性能,推荐采用。
The WIMAX (Worldwide Interoperability for Microwave Access) system uses Orthogonal Frequency Division Multiplexing (OFDM) technology for wireless broadband access. Channel estimation is the key technology of WIMAX system. In this paper, we mainly study the interpolation algorithm in WIMAX system channel estimation, including linear interpolation, second-order interpolation, DFT interpolation, DCT interpolation and amplitude phase interpolation and other algorithms, analysis and comparison of different interpolation algorithms in various SUI channel. The simulation results show that the second-order interpolation and the amplitude-phase interpolation algorithm have good performance in the line-of-sight channel. In non-line-of-sight channels, the DCT- Algorithm performance is better. In conclusion, the second-order interpolation algorithm has obtained better performance in all kinds of channels at the expense of increasing the appropriate complexity and is recommended.