| OFDM系统中基于因子图的信道估计算法 |
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| 引用本文： | 郭艳华,郭心悦,徐伯庆.OFDM系统中基于因子图的信道估计算法[J].计算机工程,2013,39(3):72-76. |
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| 作者姓名： | 郭艳华 郭心悦 徐伯庆 |
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| 作者单位： | 上海理工大学光电信息与计算机工程学院,上海,200093 |
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| 摘 要： | 为提高正交频分复用(OFDM)系统的信道估计精度，根据频谱资源的无陑信道特性，提出基于因子图的 OFDM 系统信道估计算法，包括二维联合信道估计算法和2个级联的一维信道估计算法。将时变频率选择性衰落信道建模为一阶自回归模型，使信道参数之间的交互信息近似为高斯分布，利用和积算法实现OFDM系统的联合信道估计和符号检测。仿真结果表明，该信道估计算法能够以较低的计算复杂度逼近最优的估计性能。
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| 关 键 词： | 正交频分复用 信道估计 符号检测 因子图 和积算法 |
| 收稿时间： | 2012-04-19 |
Channel Estimation Algorithm Based on Factor Graph for OFDM System |
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| GUO Yan-hua
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GUO Xin-yue
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XU Bo-qing.Channel Estimation Algorithm Based on Factor Graph for OFDM System[J].Computer Engineering,2013,39(3):72-76. |
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| Authors: | GUO Yan-hua GUO Xin-yue XU Bo-qing |
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| Affiliation: | (School of Optical-electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China) |
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| Abstract: | According to the characteristics of the wireless channel, channel estimation algorithms based on the factor graph are proposed for Orthogonal Frequency Division Multiplexing(OFDM) system to improve the precision of channel estimation and bandwidth efficiency, which include two-dimension joint channel estimation and one-dimensional channel estimation algorithm. Time-varying frequency-selective fading channels can be modeled as one order autoregressive processes and approximating messages as Gaussian distribution, a novel channel estimation and symbol detection method for OFDM system is deduced by applying sum-product algorithm on the factor graph. Simulation results show that the algorithm can achieve good performance with low computational complexity. |
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| Keywords: | Orthogonal Frequency Division Multiplexing(OFDM) channel estimation symbol detection factor graph Sum-product Algorithm(SPA) |
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