| 一种基于循环前缀的OFDM简化同步算法 |
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| 引用本文： | 方向红,高扬,杨绿溪. 一种基于循环前缀的OFDM简化同步算法[J]. 安徽理工大学学报(自然科学版), 2005, 25(4): 49-52 |
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| 作者姓名： | 方向红 高扬 杨绿溪 |
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| 作者单位： | 东南大学无线电工程系,江苏,南京,210096;东南大学无线电工程系,江苏,南京,210096;东南大学无线电工程系,江苏,南京,210096 |
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| 摘 要： | OFDM系统是一种特殊的多载波通信系统,它对同步的要求特别高,同步不准确会很大程度地影响系统的性能。为此提出一种基于循环前缀的OFDM同步算法,利用了最大相关原则,并进行了能量归一化,对最大似然同步算法进行了简化,适用于信噪比未知的情况。仿真结果表明:不论在高斯加性白噪声信道还是在频率选择性衰落信道条件下,其性能都接近于最大似然同步算法。
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| 关 键 词： | OFDM 循环前缀 最大似然 最大相关 |
| 文章编号： | 1672-1098(2005)04-0049-04 |
| 修稿时间： | 2005-06-24 |
A Simplified Synchronization Algorithm Based on Cyclic Prefix for OFDM Systems |
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| FANG Xiang-hong,GAO Yang,YANG Lu-xi. A Simplified Synchronization Algorithm Based on Cyclic Prefix for OFDM Systems[J]. Journal of Anhui University of Science and Technology:Natural Science, 2005, 25(4): 49-52 |
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| Authors: | FANG Xiang-hong GAO Yang YANG Lu-xi |
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| Abstract: | Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier communication system, which is extremely sensitive and vulnerable to synchronization errors. Synchronization errors can lead to severe system degradation. This article proposes an OFDM synchronization algorithm based on cyclic prefix, which uses maximum-correlation criterion and normalizes the energy of received signals. This synchronization algorithm simplifies maximum-likelihood synchronization algorithm and suits to the case when SNR is unkown. The computer simulations show that this simplified synchronization algorithm has a good performance whether it is used in AWGN channels or in frequency selective Rayleigh fading channels. |
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| Keywords: | Orthogonal Frequency Division Multiplexing (OFDM) cyclic prefix maximum-likelihood maximum-correlation |
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