| 基于椭球基扩展模型的OFDM快变信道估计仿真 |
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| 引用本文： | 任大孟,张曙.基于椭球基扩展模型的OFDM快变信道估计仿真[J].计算机仿真,2008,25(12). |
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| 作者姓名： | 任大孟 张曙 |
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| 作者单位： | 哈尔滨工程大学,信息与通信工程学院,黑龙江,哈尔滨,150001 |
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| 摘 要： | 在无线正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统中,快速时变信道带来的子载波间干扰(intercarrier interference,ICI)影响子载波间的正交性,严重恶化系统性能.由于信道在一个OFDM符号期间内就发生变化,导致信道的频域矩阵不再具有对角性,给信道估计带来新的挑战.为解决上述问题,针对快变信道情况下,利用椭球基扩展信道模型,采用频域插入优化的梳状导频的方法,基于改进的线性最小均方误差估计器(LMMSE)对快变信道进行估计,仿真结果表明,方法能够对快变信道进行准确估计,为信道均衡提供了良好的性能.
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| 关 键 词： | 正交频分复用 双选择信道估计 基扩展模型 线性最小均方误差 |
Rapidly Time-varying Channel Estimation for OFDM Systems Using Discrete Prolate Spheroidal Sequences |
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| REN Da-meng,ZHANG Shu.Rapidly Time-varying Channel Estimation for OFDM Systems Using Discrete Prolate Spheroidal Sequences[J].Computer Simulation,2008,25(12). |
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| Authors: | REN Da-meng ZHANG Shu |
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| Affiliation: | REN Da-meng,ZHANG Shu(College of Information , Communication Engineering,Harbin Engineering University,Harbin Heilongjiang 150001,China) |
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| Abstract: | Wireless orthogonal frequency division multiplexing (OFDM) systems encounter performance degradations because of the impairment caused by the rapidly time-varying channel. The channel variations within one OFDM symbol introduce intercarrier interference (ICI). In this case, the frequency domain channel matrix is no longer diagonal, hence the corresponding channel estimation is challenging. In this paper, a novel channel estimation technique is presented to fight against the rapidly time-varying channel. By ... |
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| Keywords: | OFDM Doubly-selective channel estimation Basis expansion model LMMSE |
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