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arXiv 2408.04192eess.SP
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正交时频空(OTFS)系统中基于导频的联合时间同步与信道估计

Pilot-Aided Joint Time Synchronization and Channel Estimation for OTFS

Jiazheng Sun, Peng Yang, Xianbin Cao, Zehui Xiong, Haijun Zhang, Tony Q. S. Quek

AI总结:

针对OTFS系统,提出基于MLS导频的JTSCE算法,利用MLS自相关特性估计定时偏移与信道延迟抽头,推导多普勒和信道增益闭式解,误码率性能接近理想同步与信道状态下的水平。

摘要:

本文提出了一种适用于正交时频空(OTFS,orthogonal time frequency space)系统的基于导频的联合时间同步与信道估计(JTSCE,joint time synchronization and channel estimation)算法。与现有算法不同,JTSCE采用最大长度序列(MLS,maximum length sequence)而非孤立信号作为导频。其独特之处在于,JTSCE利用MLS的自相关特性来估计定时偏移和信道延迟抽头。在得到延迟抽头后,推导得到了各传播路径的多普勒频移和信道增益的闭式表达式。仿真结果表明,与同类算法相比,JTSCE取得了更优的误码率性能,接近完美时间同步和理想信道状态信息下的性能。

英文摘要:

This letter proposes a pilot-aided joint time synchronization and channel estimation (JTSCE) algorithm for orthogonal time frequency space (OTFS) systems. Unlike existing algorithms, JTSCE employs a maximum length sequence (MLS) rather than an isolated signal as the pilot. Distinctively, JTSCE explores MLS's autocorrelation properties to estimate timing offset and channel delay taps. After obtaining delay taps, closed-form expressions of Doppler and channel gain for each propagation path are derived. Simulation results indicate that, compared to its counterpart, JTSCE achieves better bit error rate performance, close to that with perfect time synchronization and channel state information.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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