摘要
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。
WIMAX system employs OFDM to realize the wireless broadband access, and thus the channel estimation becomes the key technology in WIMAX system. This paper mainly describes the interpolation algorithm for channel estimation in WIMAX system, including the applications of various interpolation algorithms, such as linear interpolation, second-order interpolation, DFT interpolation, DCT interpolation and amplitude ＆ phase interpolation algorithm etc. The influences of various interpolation algorithms in different SUI channels on the system performance are discussed and analyzed. Simulation results show that, in LOS channel, the second-order interpolation and the amplitude ＆ phase interpolation algorithms are of better performance, while in NLOS channel, DCT-II interpolation and second-order interpolation algorithms of better performance. In summary, second-order interpolation algorithm has better performance in most channels at the cost of appropriate complexity increase, and thus is the recommended algorithm.
出处
《通信技术》
2012年第1期49-51,共3页
Communications Technology
