| CP不足情况下OFDM系统信道估计与均衡 |
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| 引用本文： | 邱昕,张浩,亓中瑞,刘壹. CP不足情况下OFDM系统信道估计与均衡[J]. 电子科技大学学报(社会科学版), 2009, 0(2) |
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| 作者姓名： | 邱昕 张浩 亓中瑞 刘壹 |
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| 作者单位： | 中国科学院微电子研究所通信与多媒体SOC实验室; |
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| 基金项目： | 国家自然科学基金(60425413) |
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| 摘 要： | 正交频分复用(OFDM)系统中的循环前缀具有一定的抗码间干扰(ISI)和子载波间干扰(ICI)的能力,但是当多径衰落信道的最大信道脉冲响应(CIR)长度超过了循环前缀(CP)长度时,OFDM系统的性能将会严重下降。传统的信道估计和均衡方案面对循环前缀长度不够的情况无法避免性能的严重衰落。由此提出了一种可以估计出大于CP长度CIR的信道估计方法,并且给出了一种基于逼零(ZF)准则的低复杂度均衡器,以抵消ISI和ICI的影响。仿真结果表明所提方案与传统方案相比在复杂度上和性能上有明显的优势。
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| 关 键 词： | 信道估计 子载波间干扰 码间干扰 正交频分复用 逼零准则的低复杂度均衡器 |
Channel Estimation and Equalization of OFDM Systems with Insufficient Cyclic Prefix |
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| QIU Xin,ZHANG Hao,QI Zhong-rui,, LIU Yi. Channel Estimation and Equalization of OFDM Systems with Insufficient Cyclic Prefix[J]. Journal of University of Electronic Science and Technology of China(Social Sciences Edition), 2009, 0(2) |
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| Authors: | QIU Xin ZHANG Hao QI Zhong-rui LIU Yi |
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| Affiliation: | Communication & Multimedia SOC Lab.;Institute of Microelectronics;Chinese Academy of Sciences Chaoyang Beijing 100029 |
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| Abstract: | Inherent inter-symbol and inter-carrier interference elimination ability of orthogonal frequency division multiplexing (OFDM) system attribute to its cyclic prefix. But the case of multipath fading channels whose the channel impulse response (CIR) length exceeds the duration of cyclic prefix (CP) causes intersymbol interference (ISI) and intercarrier interference (ICI), which may degrade system performance severely. Conventional channel estimation and equalization schemes, if applied to this case of insuffi... |
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| Keywords: | channel estimation ICI ISI OFDM ZF-DFE |
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