| 采样频偏对MB-OFDM-UWB系统影响分析和估计算法 |
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| 引用本文： | 陈小硕,徐平平,张在琛.采样频偏对MB-OFDM-UWB系统影响分析和估计算法[J].南京邮电大学学报(自然科学版),2006,26(2):67-71. |
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| 作者姓名： | 陈小硕 徐平平 张在琛 |
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| 作者单位： | 东南大学,移动通信国家重点实验室,江苏,南京,210096 |
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| 基金项目： | 国家科技攻关项目;江苏省自然科学基金;江苏省南京市科技发展基金 |
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| 摘 要： | 分析了多带-正交频分复用-超宽带系统(MB-OFDM-UWB)中采样频偏对系统性能的影响,并进一步推导出存在采样频偏时接收端符号相位旋转的表达式,结果表明,MB-OFDM-UWB系统中采样频偏对系统的影响不仅与数据帧的符号个数、子载波数相关,而且与循环前缀长度有关。在上述分析的基础上提出了一种基于导频符号的采样频偏估计算法,该方法只需要发送一个OFDM导频符号即可较为精确地估计出采样频偏,方法简单,易于实现。
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| 关 键 词： | 超宽带 正交频分复用 采样频偏 |
| 文章编号： | 1673-5439（2006）02-0067-05 |
| 收稿时间： | 2005-11-10 |
| 修稿时间： | 2005年11月10 |
Effect of Sampling Frequency Offset on MB-OFDM-UWB System and an Estimation Algorithm |
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| CHEN Xiao-shuo,XU Ping-ping,ZHANG Zai-chen.Effect of Sampling Frequency Offset on MB-OFDM-UWB System and an Estimation Algorithm[J].Journal of Nanjing University of Posts and Telecommunications,2006,26(2):67-71. |
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| Authors: | CHEN Xiao-shuo XU Ping-ping ZHANG Zai-chen |
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| Institution: | State Key Laboratory on Mobile Communications, Southeast University, Nanjing 210096, China |
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| Abstract: | In this paper,the sensitivity of sampling frequency offset in MB-OFDM-UWB system is analyzed.The equation of symbols'phase rotation in receiver is given when there is sampling frequency offset between the transmitter and the receiver.It is shown that the impact of sampling frequency offset lies on not only the number of sub-carriers and OFDM symbols,but also the length of the cycle prefix.Based on the analysis,we propose a sampling frequency offset estimation algorithm by transmitting only one OFDM pilot-symbols.Theoretical analysis and experimental results show that this method is simple and the result is accurate. |
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| Keywords: | UWB Orthogonal frequency division multiplexing Sampling frequency offset |
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