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共轭对称前导OFDM系统的定时偏移 被引量：3

Timing Offset in OFDM Systems Based on Conjugate-Symmetric Preamble
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摘要 该文研究多径衰落信道中基于共轭对称结构前导的OFDM符号同步.通过分析共轭对称相关定时度量的统计特性,指出共轭对称前导经过多径信道时,在路径间相对延迟为偶数采样间隔的条件下会形成复合共轭对称结构.较强的复合共轭对称结构和第1径为非主径的情况下,依据定时度量的最大值进行符号同步估计时会产生定时偏移.定时偏移引起符号间干扰和子载波间干扰,偏移较大时将严重影响系统性能.仿真实验证实了上述分析的正确性. This paper studies symbol synchronization methods based on the conjugate-symmetric preamble for OFDM systems in multipath fading channels.We analyze statistic properties of timing metric based on conjugate-symmetric correlation,and show that the compound-conjugate-symmetric structure is formed when two paths are separated by an even number of samples.The timing metric corresponding to the compound-conjugate -symmetric structure may be large under some conditions.We analyze the timing offset when the peak value of timing metric is used to detect the desired timing position,and show that the compound-conjugate-symmetric structure and the first path with small gain may result in backward shift in timing position.A large backward shift can cause inter-symbol and inter-channel interferences,seriously degrading the OFDM system performance.Simulation results confirm the analysis.
作者 石峰 周柱 王晨 张尔扬
机构地区 国防科技大学电子科学与工程学院 空军工程大学工程学院
出处 《应用科学学报》 EI CAS CSCD 北大核心 2010年第5期463-469,共7页 Journal of Applied Sciences
关键词 OFDM 符号同步 定时偏移 共轭对称 对称相关 OFDM symbol synchronization timing offset conjugate-symmetric symmetric correlation
分类号 TN929.5 [电子电信—通信与信息系统]
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参考文献12

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二级参考文献6

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共引文献31

同被引文献25

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引证文献3

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应用科学学报
2010年 第5期

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