| 虚载波存在下低复杂度的OFDM信道估计 |
| |
| 引用本文： | 孙霏菲,刘丹谱,张建华,乐光新. 虚载波存在下低复杂度的OFDM信道估计[J]. 北京邮电大学学报, 2010, 33(1): 61-64. DOI: 10.3969/j.issn.1007-5321.2010.01.013 |
| |
| 作者姓名： | 孙霏菲 刘丹谱 张建华 乐光新 |
| |
| 作者单位： | 泛网无线通信教育部重点实验室,北京邮电大学,,北京,100876;泛网无线通信教育部重点实验室,北京邮电大学,,北京,100876;泛网无线通信教育部重点实验室,北京邮电大学,,北京,100876;泛网无线通信教育部重点实验室,北京邮电大学,,北京,100876 |
| |
| 基金项目： | 国家自然科学基金项目，国家高技术研究发展计划项目，国家重点基础研究发展计划项目，国家重大科技专项项目，教育部留学归国人员教学、科研建设项目 |
| |
| 摘 要： | 首先分析了虚载波对基于离散傅里叶变换(DFT)信道估计的影响，结果表明，对于边缘子载波，由于虚载波部分导频信道信息缺失所引起的估计误差远大于噪声带来的估计误差，严重影响边缘子载波的信道估计性能. 基于此分析，提出了一种低复杂度的正交频分复用(OFDM)信道估计方法，在边缘子载波，利用频域最小平方(LS)估计结果代替DFT估计结果，并给出了边缘子载波替换准则及此信道估计方法的均方误差下界. 仿真结果表明，所提方法均方误差(MSE)及误码率(BER)性能优于频域LS估计和单纯基于DFT的估计.
|
| 关 键 词： | 正交频分复用 虚载波 信道估计 |
| 收稿时间： | 2009-05-14 |
| 修稿时间： | 2009-10-21 |
A Channel Estimation Scheme with Low Complexity in the Presence of the Virtual Subcarriers for OFDM Systems |
| |
| SUN Fei-fei,LIU Dan-pu,ZHANG Jian-hua,YUE Guang-xin. A Channel Estimation Scheme with Low Complexity in the Presence of the Virtual Subcarriers for OFDM Systems[J]. Journal of Beijing University of Posts and Telecommunications, 2010, 33(1): 61-64. DOI: 10.3969/j.issn.1007-5321.2010.01.013 |
| |
| Authors: | SUN Fei-fei LIU Dan-pu ZHANG Jian-hua YUE Guang-xin |
| |
| Affiliation: | (Key Laboratory of Universal Wireless Communication(Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China) |
| |
| Abstract: | Based on discrete Fourier transform(DFT) estimator, the effect of virtual subcarriers is analyzed. It is shown that, on edge subcarriers, the estimation errors caused by channel information missing are much larger than that caused by noise. Therefore the estimation errors of edge subcarriers are getting worse. A low complexity channel estimator is proposed. The proposed estimator takes the least square(LS) estimation instead of the DFT estimation on edge subcarriers. Then replacement criteria and the bound of mean square error(MSE) are presented. The simulation shows that the MSE and BER performances of the proposed method are better than that of LS estimator or DFT-based estimator. |
| |
| Keywords: | Orthogonal frequency division multiplexing (OFDM) virtual subcarriers channel estimation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《北京邮电大学学报》浏览原始摘要信息 |
|
点击此处可从《北京邮电大学学报》下载全文 |
|
