通信学报 ›› 2014, Vol. 35 ›› Issue (9): 91-98.doi: 10.3969/j.issn.1000-436x.2014.09.009

• 论文Ⅱ • 上一篇    下一篇

LTE上行多用户SC-FDMA系统中时变信道估计方法

杨丽花,杨龙祥,朱洪波   

  1. 南京邮电大学 无线通信重点实验室,江苏 南京 210003
  • 出版日期:2014-09-25 发布日期:2017-06-14
  • 基金资助:
    国家重点基础研究发展计划(“973”计划)基金资助项目;国家自然科学基金项目资助;南京邮电大学人才引进基金项目资助;国家科技重大专项基金资助项目

Time-varying channel estimation for LTE uplink SC-FDMA system with multi-user

Li-hua YANG,Long-xiang YANG,Hong-bo ZHU   

  1. Key Lab.of Wireless Communications,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
  • Online:2014-09-25 Published:2017-06-14
  • Supported by:
    The National Basic Research Program of China(973 Program);The National Natural Science Foundation of China;Nanjing University of Posts & Telecommunications Project;The Important National Science and Technology Specific Project

摘要:

针对高速移动时分双工长期演进(TDD-LTE,time division duplex-long term evolution)上行单载波?频分多址(SC-FDMA,single carrier-frequency division multiple access)系统,提出了一种新型的变换域时变信道估计方法。在所定义的变换域中,基于两块导频符号的信道参数估计,提出利用基于判决导向的非线性内插方法来估计数据符号的信道参数。为了便于SC-FDMA系统均衡,推导给出了变换域信道与频域信道的转换表达式,利用该式可以直接将变换域信道参数估计转化为频域信道响应。计算机仿真结果表明,新方法的性能远远优于传统方法的估计性能,且具有低的计算复杂度。

关键词: TDD-LTESC-FDMA, 时变信道估计, 变换域, 非线性内插, 判决导向

Abstract:

A novel transform-domain based time-varying channel estimation method is proposed for the long term evolu-tion (LTE) uplink single carrier-frequency division multiple access (SC-FDMA) systems with multi-user.In the transform domain,the channel parameters of the two block pilots were firstly estimated,then the decision-directed (DD) based non-linear interpolation method was employed to estimate the channel parameters of the data symbols.To convenient equalization in the frequency domain,the transform expression of the transform-domain channel and frequency-domain channel was derived,by which the channel estimation in the frequency domain could be directly obtained.Simulation re-sults show that the performance of the proposed method is much better than those of the available methods,and the pro-posed method has a low computational complexity.

Key words: TDD-LTE SC-FDMA, time-varying channel estimation, transform domain, non-linear interpolation, deci-sion-directed