| 马子骥,彭强,王炼红,刘宏立.基于压缩感知的低复杂度分数时延信道估计方法[J].电子测量与仪器学报,2017,31(5):724-730 |
| 基于压缩感知的低复杂度分数时延信道估计方法 |
| Low complexity fractional delay channel estimation method based on compressed sensing |
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| DOI：10.13382/j.jemi.2017.05.011 |
| 中文关键词: 分数时延 正交频分复用 压缩感知 信道估计 匹配追踪 过采样 |
| 英文关键词:fractional delay OFDM compressed sensing channel estimation matching pursuit oversampling |
| 基金项目:中央国有资本经营预算项目（财企［2013］470号）、中央高校基本科研项目（2014 004）、国家自然科学基金（61540012）、中国博士后科研基金（2014M562100）、湖南省科技计划重点项目（2015JC3053）、教育部产学合作协同育人项目（201601004010）资助 |
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| Author | Institution |
| Ma Ziji | School of Electrical and Information Engineering, Hunan University, Changsha 410082, China |
| Peng Qiang | School of Electrical and Information Engineering, Hunan University, Changsha 410082, China |
| Wang Lianhong | School of Electrical and Information Engineering, Hunan University, Changsha 410082, China |
| Liu Hongli | School of Electrical and Information Engineering, Hunan University, Changsha 410082, China |
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| 中文摘要: |
| 基于压缩感知 (compressed sensing，CS) 技术的信道估计方法已被应用于正交频分复用(orthogonal frequency division multiplexing，OFDM) 系统的信道估计中以提高频谱利用率。然而，传统的时域普通采样方法会导致信道测量矩阵不够精细，无法精确恢复信道状态信息。针对这一问题，提出利用分数时延信道模型模拟系统的无线多径信道，利用接收端时域过采样方法细化信道测量矩阵以提高信道估计精度。同时，为了克服由时域过采样导致的算法复杂度增加的问题,提出一种改进正交匹配追踪算法(modified orthogonal matching pursuit，MOMP)。仿真实验结果表明，在分数时延信道条件下，提出的接收端时域过采样方法能准确检测到信道的分数时延且提出的MOMP算法能显著降低估计算法的计算复杂度。 |
| 英文摘要: |
| The channel estimation based on compressed sensing (CS) technology is applied in the OFDM system to improve the spectrum utilization. However, the traditional time domain sampling method causes the imprecision to the channel measurement matrix, which can’t accurately recover the channel state information of the transmission channel path. To solve this problem, a fractional delay channel model is proposed to simulate the system wireless multipath channel, and a time domain oversampling at the receiver is exploited to improve the estimation accuracy. Meanwhile, to reduce the computational complexity for which is increased due to the time domain oversampling, a modified orthogonal matching pursuit (MOMP) algorithm is proposed to lower the computational complexity. The simulation experiment results show that the time domain oversampling at the receiver proposed in this paper can accurately detect the channel fractional delay and the proposed MOMP algorithm can significantly reduce the computational complexity of the estimation algorithm under the fractional delay channel environment. |
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