| 一种快时变信道下多载波传输系统的信道估计方法 |
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| 引用本文： | 任晓敏,倪卫明.一种快时变信道下多载波传输系统的信道估计方法[J].复旦学报(自然科学版),2007,46(1):100-105. |
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| 作者姓名： | 任晓敏 倪卫明 |
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| 作者单位： | 复旦大学,通信科学与工程系,上海,200433 |
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| 摘 要： | 提出了一种基于正交频分复用技术的多载波通信系统的时变信道估计方法.通过用泰勒级数展开近似时变冲击响应函数得到简化的时变信道模型,由此导出信道估计方法,结合ZP(zero padding)-OFDM系统能在一定程度上恢复处于深度衰落点上的信号来改善系统性能,并应用信道传输矩阵的带状特性,给出了在时域上进行线性块均衡的方法.且此方法可在系统性能和复杂度间做权衡.
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| 关 键 词： | 通信技术 正交频分复用 快时变信道 迫零均衡 泰勒级数展开 子载波干扰 |
| 文章编号： | 0427-7104（2007）01-00100-06 |
| 修稿时间： | 2006-09-29 |
A Channel Estimator for Multi-Carrier System in Fast Time-Varying Fading Channels |
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| REN Xiao-min,NI Wei-ming.A Channel Estimator for Multi-Carrier System in Fast Time-Varying Fading Channels[J].Journal of Fudan University(Natural Science),2007,46(1):100-105. |
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| Authors: | REN Xiao-min NI Wei-ming |
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| Institution: | Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China |
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| Abstract: | A new method of channel estimation of fast time-varying channels for multi-carrier system based on OFDM is presented. By using Taylor series to expand the approximate time-varying channel impulse response simplified time-varying channel model is obtained, and the channel estimation algorithm is deduced. The multi-carrier transmissions system, combined with ZP-OFDM, can recover the signal in some manner to improve the performance of the system, even when deep fades are present. A low-complexity block zero-forcing equalizer in the time domain according to the band and lower triangular structure of the channel transfer matrix is proposed. Moreover, the proposed method allows flexible tradeoff between complexity and performance. |
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| Keywords: | communication technology ZP-OFDM fast time-varying channel zero-forcing(ZF) equalizer Taylor series expansion inter-carrier interference (ICI) |
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