| 基于EM的联合信道参数估计和数据检测算法 |
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| 引用本文： | 张蕊萍,张太镒,龚政委.基于EM的联合信道参数估计和数据检测算法[J].电子与信息学报,2006,28(11):2130-2134. |
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| 作者姓名： | 张蕊萍 张太镒 龚政委 |
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| 作者单位： | 西安交通大学电信学院,西安,710049;兰州交通大学信电学院,兰州,730070;西安交通大学电信学院,西安,710049 |
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| 摘 要： | 为提高OFDM系统的传输效率，考虑正交频分复用(OFDM)系统的特殊结构，该文提出一种使用少量导频的EM(Expectation Maximization)迭代信道参数估计算法。在每次迭代中不但更新信道冲激响应而且更新噪声方差的估计值。为进一步提高算法的收敛速度，提出联合信道参数估计和数据检测算法。仿真结果表明，在插入较少导频时，基于EM的信道估计算法仍能收敛到给定参数的信道，联合信道参数估计和数据检测算法迭代次数明显减少，并且保持系统的误码率性能不变。
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| 关 键 词： | 正交频分复用 相关检测 信道估计 EM算法 |
| 文章编号： | 1009-5896(2006)11-2130-05 |
| 收稿时间： | 2005-04-11 |
| 修稿时间： | 2005-11-22 |
EM-Based Joint Channel Estimation and Data Detection Algorithm |
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| Zhang Rui-ping,Zhang Tai-yi,Gong Zheng-wei.EM-Based Joint Channel Estimation and Data Detection Algorithm[J].Journal of Electronics & Information Technology,2006,28(11):2130-2134. |
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| Authors: | Zhang Rui-ping Zhang Tai-yi Gong Zheng-wei |
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| Affiliation: | School of Electronic Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
School of Information &; Electronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China |
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| Abstract: | To improve transmission efficiency, Expectation Maximization(EM) based channel parameters estimation iteration algorithm is proposed, employed the special features of Orthogonal Frequency Division Multiplexing (OFDM) system. Channel impulse response is updated at each iteration, furthermore the noise variance is update also. To improve the algorithm convergence, EM-based joint channel parameters estimation and data detection algorithm is proposed. Simulation results demonstrate the proposed EM-based algorithm can converge to the case with known channel parameters with fewer pilots and the joint channel parameters estimation and data detection algorithm converges significantly fast. |
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| Keywords: | Orthogonal Frequency Division Multiplexing (OFDM) Coherent detection Channel Estimation(CE) Expectation Maximization (EM) algorithm |
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