Enhanced Timing Advanced Estimation With Symmetric Zadoff-Chu Sequences for Satellite Systems
Enhanced Timing Advanced Estimation With Symmetric Zadoff-Chu Sequences for Satellite Systems
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DOI：
10.1109/lcomm.2015.2411610
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Gaofeng Cui;Yizhou He;Pengxu Li;Weidong Wang
中科院分区：
文献类型：
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作者：
Gaofeng Cui;Yizhou He;Pengxu Li;Weidong Wang
Zadoff-Chu序列定时超前估计对频偏敏感，特别是对于具有大多普勒频移和振荡器不确定性的卫星系统。本文提出了一种基于对称Zadoff-Chu序列的定时超前估计算法（TAE-SZC），分别用于整数倍和小数倍频偏的情况。TAE-SZC利用Zadoff-Chu序列的对称性解决了整数阶频偏的影响，并采用迭代补偿的方法消除了小数阶频偏的影响。仿真结果表明，TAE-SZC在不增加时频资源消耗的情况下，优于传统的定时提前估计方法。
Timing advanced estimation with Zadoff-Chu sequences is sensitive to the frequency offset, especially for satellite systems with large Doppler shift and oscillator uncertainties. In this letter, Timing Advanced Estimation with Symmetric Zadoff-Chu sequences (TAE-SZC) is proposed to deal with the integer and fractional frequency offset, respectively. By adopting TAE-SZC, the effect of integer frequency offset can be resolved by the symmetric properties of Zadoff-Chu sequences, and an iterative compensation method is used to mitigate the effect of fractional frequency offset. Simulation results show that TAE-SZC outperforms the conventional timing advanced estimation methods without incurring additional consumption of time/frequency resource.