| 新型的IEEE 802.11n联合符号定时同步与细频偏估计算法 |
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| 引用本文： | 黄明,曾勇波,李争平,罗守山,许成谦.新型的IEEE 802.11n联合符号定时同步与细频偏估计算法[J].北京邮电大学学报,2012,35(4):59-63. |
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| 作者姓名： | 黄明 曾勇波 李争平 罗守山 许成谦 |
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| 作者单位： | 北京邮电大学信息安全中心,北京100876;北方工业大学信息学院,北京100041;北京安码科技有限公司,北京100876;北方工业大学信息学院,北京,100041;北京邮电大学信息安全中心,北京100876;北京安码科技有限公司,北京100876;北京邮电大学信息安全中心,北京,100876 |
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| 基金项目： | 国家自然科学基金项目(61121061);北京市教委面上项目(KM201110009003) |
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| 摘 要： | 在以MIMO-OFDM为基础的IEEE 802.11n无线局域网系统中,引入循环移位延时(CSD)以区分不同数据流上的数据,但也给同步带来了难题.若以训练序列与接收信号相关,造成的伪相关现象会导致定时不准,影响接收机的性能.为此,通过分析802.11n所定义的前导符号结构特点和CSD的影响,提出了新型的802.11n联合符号定时同步与细频偏估计算法.仿真结果表明,其优点是不受频偏的影响,并能较好地抑制前导符号运算中伪相关结果的产生,提高检测的准确度.
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| 关 键 词： | MIMO-OFDM 无线局域网 循环移位延时 同步 |
| 收稿时间： | 2011-12-08 |
A New Joint Symbol Synchronization and Fine Frequency Offset Estimation Algorithm in IEEE 802.11n |
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| HUANG Ming
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ZENG Yong-bo
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LI Zheng-ping
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LUO Shou-shan
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XU Cheng-qian.A New Joint Symbol Synchronization and Fine Frequency Offset Estimation Algorithm in IEEE 802.11n[J].Journal of Beijing University of Posts and Telecommunications,2012,35(4):59-63. |
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| Authors: | HUANG Ming ZENG Yong-bo LI Zheng-ping LUO Shou-shan XU Cheng-qian |
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| Affiliation: | 1.Information Security Center, Beijing University of Posts and Telecommunications 2.College of Information Engineering, North China University of Technology 3.Beijing Safe-Code Technology Company Limited |
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| Abstract: | The introduction of cyclic shift delay(CSD) is used in IEEE 802.11n to distinguish different spatial streams,however it poses a challenge to synchronization.The traditional synchronization methods,which utilize the cross-correlation between the local training sequence and the received signal,will cause many spurious peaks and result in deteriorated synchronization performance.A new joint symbol synchronization and fine frequency offset estimation algorithm is proposed.It exploits the structure of IEEE 802.11n preamble and adopts a delay-correlation algorithm to eliminate the effect of CSD.The proposed algorithm has advantages in avoiding the effect of carrier frequency offset,suppressing the generation of spurious peak results and improving the detection accuracy. |
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| Keywords: | MIMO-OFDM IEEE 802 11n cyclic shift delay synchronization |
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