| 适用于OFDM系统的改进的信道估计算法 |
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| 引用本文： | 陈拿权,张建华,张平.适用于OFDM系统的改进的信道估计算法[J].高技术通讯,2008,18(8). |
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| 作者姓名： | 陈拿权 张建华 张平 |
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| 作者单位： | 北京邮电大学电信工程学院,北京,100876 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | 针对实际系统中的信道冲激响应(CIR)泄漏问题,提出了一种适用于梳状导频正交频分复用(OFDM)系统的改进的最小二乘(LS)信道估计算法.该算法基于分数抽头延时信道近似(FTCA)的参数化信道模型,此信道模型采用一个抽头间隔为分数倍采样间隔的抽头延时线结构的有限冲激响应(FIR)滤波器表示.此算法首先通过FTCA信道模型来近似实际信道,然后再估计该信道模型中的某些参数来获取实际的信道信息;该算法利用了FTCA信道模型中所有的延时抽头,从而很好地抑制了CIR泄漏.仿真与分析表明,FTCA信道模型能够有效地近似实际信道,同时降低信道自相关矩阵的维数,从而提高信道估计的性能.
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| 关 键 词： | 正交频分复用(OFDM) 分数延时抽头信道近似(FTCA) 信道估计 信道冲激响应泄漏 |
An improved channel estimation method for OFDM systems |
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| Chen Naquan,Zhang Jianhua,ZhangPing.An improved channel estimation method for OFDM systems[J].High Technology Letters,2008,18(8). |
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| Authors: | Chen Naquan Zhang Jianhua ZhangPing |
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| Affiliation: | School of Telecommunication Engineering;Beijing University of Posts and Telecommunications;Beijing 100876 |
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| Abstract: | In order to lessen the severe effects of the channel impulse response (CIR) leakage in practical orthogonal frequency division multiplexing (OFDM) systems,an improved least square (LS) channel estimation algorithm was proposed, which could be adopted in OFDM systems based on comb-type pilot arrangement.The algorithm was based on a paramet- ric channel approximation model,whiCh was called the fraction taps channel approximation (FTCA) channel model and was modeled as a finite impulse response (FIR) on some d... |
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