| OFDM系统中一种基于LMMSE的半盲信道估计算法 |
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| 引用本文： | 周洁,赵晓晖,林高三.OFDM系统中一种基于LMMSE的半盲信道估计算法[J].吉林大学学报(工学版),2009,39(2). |
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| 作者姓名： | 周洁 赵晓晖 林高三 |
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| 作者单位： | 吉林大学通信工程学院信息科学实验室,长春,130012 |
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| 基金项目： | 吉林省科技发展计划项目(20050521) |
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| 摘 要： | 为克服信道冲激响应长度大于导频数时出现系统性能下降,适应存在大量多径的恶劣信道环境,本文对OFDM系统基于MLE的半盲信道估计算法进行了改进。该算法采用非均匀间隔导频排列方式以获得更小的系统均方误差。通过简化导频数提高了系统频带利用率,利用奇异值分解进一步简化了算法复杂度。仿真结果表明:如充分利用信道统计信息,在导频数目很少、信道长度很大和低信噪比时,本文提出的算法能够以较低复杂度实现精确的信道估计,从而验证了该算法的有效性和优越性。
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| 关 键 词： | 通信技术 半盲信道估计 OFDM系统 LMMSE SVD 非均匀间隔导频 |
Improved semi-blind channel estimation algorithm based on LMMSE for OFDM system |
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| ZHOU Jie,ZHAO Xiao-hui,LIN Gao-san.Improved semi-blind channel estimation algorithm based on LMMSE for OFDM system[J].Journal of Jilin University:Eng and Technol Ed,2009,39(2). |
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| Authors: | ZHOU Jie ZHAO Xiao-hui LIN Gao-san |
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| Affiliation: | Laboratory of Information Science;College of Communication Engineering;Jilin University;Changchun 130012;China |
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| Abstract: | In order to overcome the disadvantages of system performance degradation on the condition of pilot numbers smaller than channel impulse length and bad channel environment in many paths,an improved semi-blind channel estimation algorithm based on MLE for OFDM system was presented.The proposed algorithm can reach small system mean square error with non-uninformed pilots.And by the reduction of pilot numbers,frequency resource of the system is increased.In addition,with singular value decomposition,the algorit... |
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| Keywords: | communication semi-blind channel estimation OFDM system LMMSE SVD nonuniform space pilots |
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