| 一种基于OFDM的数字多媒体广播载频同步方法 |
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| 引用本文： | 刘星沙,李敏,沙金.一种基于OFDM的数字多媒体广播载频同步方法[J].铁道科学与工程学报,2006,3(6):91-95. |
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| 作者姓名： | 刘星沙 李敏 沙金 |
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| 作者单位： | 1. 中南大学,现代教育技术中心,湖南,长沙,410075
2. 深圳亿思科数码科技有限公司,广东,深圳,518000 |
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| 摘 要： | 提出了一种基于OFDM的数字多媒体广播载频同步方法,该方法利用同步序列时域相关对初始频偏进行估计,利用OFDM连续导频符号对残余频偏进行估计,并根据估计值对频偏进行跟踪。跟踪过程中无需计算连续导频互相关的相位值,大大降低了实现的复杂度;通过对多个连续导频互相关相位值的加权平均,降低了信道对频偏估计的影响;采用变步长对频偏进行跟踪,在减小捕获时间的同时减小了跟踪方差。时变多径信道下仿真结果表明,该方法能够有效地满足系统需求。
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| 关 键 词： | OFDM 载波频偏 同步序列 连续导频 |
| 文章编号： | 1672-7029(2006)06-0091-05 |
| 修稿时间： | 2006年9月21日 |
Carrier frequency synchronization for digital multimedia broadcasting system based on OFDM |
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| LIU Xing-sha,LI Min,SHA Jin.Carrier frequency synchronization for digital multimedia broadcasting system based on OFDM[J].Journal of Railway Science and Engineering,2006,3(6):91-95. |
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| Authors: | LIU Xing-sha LI Min SHA Jin |
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| Abstract: | A carrier frequency synchronization scheme for DMB(digital multimedia broadcasting) system was proposed based on OFDM.It utilized the time-domain correlation of synchronization sequences and the continuous pilot in OFDM symbol to estimate the carrier frequency offset.The phase calculation of the continuous pilot correlation is avoided to simplify the implement,and the phase is weighted averaged to reduce the influence of channel.By using variable step in the process of tracking,the tracking speed and precision can be improved simultaneously.Simulation results under time-variant multi-path channel show that the scheme can meet the requirement of the system well. |
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| Keywords: | OFDM carrier frequency offset synchronization sequence continuous pilot |
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