计算机应用与软件2013，Vol.30Issue(1)：238-241,4.DOI:10.3969/j.issn.1000-386x.2013.01.060
基于多普勒辅助迭代的高速OFDM系统信道估计方法
CHANNEL ESTIMATION FOR HIGH MOBILITY OFDM SYSTEM BASED ON DOPPLER-ASSISTED ITERATION
邓宏贵 1赵俊值1
作者信息
- 1. 中南大学物理与电子学院 湖南长沙410083
- 折叠
摘要
Abstract
For high mobility OFDM systems, fast time-variation of fading channel destroys the orthogonality between sub-carriers of OFDM and lead to serious inter-carrier interference. A Doppler-assisted iterative channel estimation method is proposed for the systems. In the method, pilot tone symbols are interpolated to proper position of OFDM symbols, channel coefficients at pilot position are obtained through iterative estimation using least mean square, and then the channel coefficients of numerical symbols position are obtained through a weighted time-domain interpolation. The interpolation weight coefficients are pertinent to Doppler frequency shift, and are calculated by the mobile velocity of the receiver. During the process of pilot channel coefficients iterative estimation, the detected data symbols are fed back as new pilots to pilot channel estimation module to carry out iterative estimation. Simulation analyses show that the proposed algorithm performs stable and does affected by Doppler shift when the receiver moving at a speed up to 300km/h, it can give channel estimation results in condition of the precision approaching the best channel.关键词
正交频分复用/载波间干扰/快时变信道/多普勒频移/信道估计Key words
Orthogonal frequency division multiplexing (OFDM)/Inter-carrier interference/Fast time-variation channel/Doppler shift/Channel estimation分类
信息技术与安全科学引用本文复制引用
邓宏贵,赵俊值..基于多普勒辅助迭代的高速OFDM系统信道估计方法[J].计算机应用与软件,2013,30(1):238-241,4.
