| 一种新颖的OFDM信号子载波数估计方法 |
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| 引用本文： | 张海川,雷迎科.一种新颖的OFDM信号子载波数估计方法[J].计算机应用研究,2017,34(1). |
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| 作者姓名： | 张海川 雷迎科 |
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| 作者单位： | 电子工程学院 安徽 合肥,电子工程学院 安徽 合肥 |
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| 基金项目： | 安徽省自然科学基金资助项目(1308085QF99, 1408085MF129)；国家自然科学基金资助项目(61272333, 61473237) |
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| 摘 要： | 针对低信噪比多径信道下传统的正交频分复用(OFDM)信号子载波数估计方法存在估计性能不高,计算复杂度高等问题,提出了一种新颖的OFDM信号子载波数估计方法。首先计算接收信号的自相关矩阵,然后对接收信号的自相关矩阵进行特征分解,提取分解后的特征值,最后根据特征值的分布特性实现子载波数目的估计。仿真实验结果验证了我们的方法在高斯白噪声信道和多径信道条件下对OFDM信号子载波数估计的有效性与可靠性。
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| 关 键 词： | OFDM 子载波数估计 自相关矩阵 特征分解 |
| 收稿时间： | 2015/10/27 0:00:00 |
| 修稿时间： | 2015/12/25 0:00:00 |
A novel blind estimation method of the number of OFDM subcarriers |
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| Hai-chuan Zhang and Ying-ke Lei.A novel blind estimation method of the number of OFDM subcarriers[J].Application Research of Computers,2017,34(1). |
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| Authors: | Hai-chuan Zhang and Ying-ke Lei |
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| Affiliation: | Electronic Engineering Institute,Electronic Engineering Institute |
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| Abstract: | Aiming at the poor performance and high computation complexity problem of traditional estimation methods for the number of the subcarriers of the OFDM signal in low signal noise ratio and multipath channel, a novel method is proposed to estimate the number of the OFDM signal. Firstly, the autocorrelation matrix of the received OFDM signal is calculated. Secondly, we implement the eigen-decomposition for the autocorrelation matrix and extract all the eigenvalues. Finally, the number of the subcarriers of the OFDM signal is estimated according to the distribution characteristic of the eigenvalues. The experimental results prove the effectiveness and reliability of the proposed method under the Gaussian white noise and multipath channel circumstance. |
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| Keywords: | OFDM subcarrier number estimation autocorrelation matrix eigen-decomposition |
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