Robust synchronization for OFDM employing Zadoff-Chu sequence
Robust synchronization for OFDM employing Zadoff-Chu sequence
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DOI：
10.1109/ciss.2012.6310837
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Malik Muhammad Usman Gul;Sungeun Lee;Xiaoli Ma
中科院分区：
文献类型：
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作者：
Malik Muhammad Usman Gul;Sungeun Lee;Xiaoli Ma
Zadoff-Chu（ZC）序列由于其理想的相关特性而被提出用于OFDM系统的时间同步。在本文中，我们研究了基于ZC序列的时间同步在大载波频率偏移（CFO）的存在下的性能。我们发现，在整数频率偏移（IFO）的存在下，同步的性能，是依赖于ZC序列的根索引和一些序列可能会完全失败的IFO的存在下。我们开发的条件，选择这样的根指数，符号间干扰可以避免一个给定的最大IFO。然后，我们设计一个基于所选择的ZC序列的前导码执行定时同步以及IFO估计。我们还提出了一个计划，以进一步提高性能的时间同步，通过估计IFO。通过仿真结果对所提出的算法的性能进行了评估。
Zadoff-Chu (ZC) sequences have been proposed for time synchronization of OFDM systems due to their ideal correlation properties. In this paper, we examine the performance of ZC sequence based time synchronization in the presence of large carrier frequency offsets (CFOs). We show that the performance of synchronization in the presence of integer frequency offsets (IFOs), is dependent on the root index of the ZC sequence and some sequences may fail entirely in the presence of IFOs. We develop the conditions to choose such root indices for which inter symbol interference can be avoided for a given maximum IFO. We then design a preamble based on the selected ZC sequences to perform timing synchronization as well as IFO estimation. We also propose a scheme to further enhance the performance of time synchronization through the estimated IFOs. The performance of the proposed algorithms is evaluated through simulation results.