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工程科学与技术:2011,43(6):158-162
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短波低信噪比OFDM猝发通信系统同步算法
(1.哈尔滨工程大学 信息与通信工程学院;2.武汉船舶通信研究所)
Synchronization Algorithm for OFDM Burst Communication Systemat HF Low SNR Environments
(1.Info. and Communication Eng. College,Harbin Eng. Univ.;2.Wuhan Maritime Communication Research Inst.)
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投稿时间:2010-12-25    修订日期:2011-08-26
中文摘要: 为解决低信噪比下短波正交频分复用(OFDM)系统信号的捕获,提出了一种采用CAZAC序列设计导频符号的基于谱分析的同步算法。首先通过时域、频域2维联合估计来实现信号的快速捕获,同时根据信号谱函数的最大峰值位置来确定整数频偏,然后利用相邻导频符号的相位差来精确估计小数频偏。最后,进行了算法仿真和现场可编程门阵列(FPGA)上的硬件实现及在线实时验证研究,结果表明,该同步方案在低信噪比条件下具有很好的同步性能,可以作为一个完整OFDM基带处理器的子模块实时、连续地对信号进行处理。
Abstract:Based on spectral analysis, a synchronization algorithm modulated multiple pilot symbols using Constant Amplitude Zero Auto-Correlation (CAZAC) sequence was presented for HF OFDM signal acquisition under low signal to noise ration. The fast signal acquisition was realized by time-frequency domain two-dimension estimation, and synchronously the integer frequency shift was obtained by the maximal peak position of spectrum function. Then the phase difference of adjacent pilot symbols was used for precisely fractional frequency shift estimation. Finally, Matlab simulations and on-chip real-time analysis of the algorithm using FPGA were done. The results demonstrated that this algorithm achieves fine performance at low SNR and can work efficiently as a block of an OFDM baseband receiver processor.
文章编号:201001237     中图分类号:    文献标志码:
基金项目:海装重点预研项目(1010306030101);船舶工业科技预研资助项目(3.7.3)
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范慧丽,孙景芳,杨平.短波低信噪比OFDM猝发通信系统同步算法[J].工程科学与技术,2011,43(6):158-162.
Fan Huili,Sun Jingfang,Yang Ping.Synchronization Algorithm for OFDM Burst Communication Systemat HF Low SNR Environments[J].Advanced Engineering Sciences,2011,43(6):158-162.