| 空载波对STBC-OFDM系统信道估计性能的影响分析与改进 |
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| 引用本文： | 王轶, 陶小峰, 张平. 空载波对STBC-OFDM系统信道估计性能的影响分析与改进[J]. 电子与信息学报, 2009, 31(3): 640-644. doi: 10.3724/SP.J.1146.2007.01730 |
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| 作者姓名： | 王轶 陶小峰 张平 |
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| 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;北京邮电大学无线新技术研究所,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;北京邮电大学无线新技术研究所,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;北京邮电大学无线新技术研究所,北京,100876 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金重大项目 |
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| 摘 要： | 该文分析了空时分组码-正交频分复用(STBC-OFDM)系统中，空载波对基于离散傅里叶变换(DFT)信道估计的性能影响，推导得出空载波影响下信道估计均方误差及误码率的解析式，并提出一种新的信道估计方法，通过时域乘以干扰因子矩阵的逆消除空载波引起的混叠，提高信道估计精度。仿真结果与理论结果相符，且表明改进的信道估计算法有效消除均方误差地板现象，提高系统性能。
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| 关 键 词： | 正交频分复用 信道估计 空时分组码 空载波 |
| 收稿时间： | 2007-11-05 |
| 修稿时间： | 2008-04-23 |
Performance Analysis and Enhancement of Channel Estimation for STBC-OFDM Systems with Virtual Subcarriers |
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| Wang Yi, Tao Xiao-feng, Zhang Ping. Performance Analysis and Enhancement of Channel Estimation for STBC-OFDM Systems with Virtual Subcarriers[J]. Journal of Electronics & Information Technology, 2009, 31(3): 640-644. doi: 10.3724/SP.J.1146.2007.01730 |
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| Authors: | Wang Yi Tao Xiao-feng Zhang Ping |
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| Affiliation: | Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China; Wireless Technology Innovation Institute, Beijing 100876, China |
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| Abstract: | Performance of Discrete Fourier Transform (DFT) based channel estimation for Space Time Block Code-Orthogonal Frequency Division Multiplexing (STBC-OFDM) systems with virtual subcarriers is analyzed. The concise expressions for Mean Squared Error (MSE) and corresponding Bit Error Rate (BER) with the effect of virtual subcarriers are provided. Besides, a new channel estimation method based on zero-forcing is presented to eliminate aliasing distortion caused by virtual subcarriers. Simulation results demonstrate the accuracy of the analysis and the efficiency of new method. |
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| Keywords: | Orthogonal Frequency Division Multiplexing (OFDM) Channel estimation Space Time Block Code (STBC) Virtual subcarriers |
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