Reliable Uplink Synchronization Maintenance for Satellite-Ground Integrated Vehicular Networks: A High-Order Statistics-Based Timing Advance Update Approach
Reliable Uplink Synchronization Maintenance for Satellite-Ground Integrated Vehicular Networks: A High-Order Statistics-Based Timing Advance Update Approach
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星地一体化车载网络的可靠上行同步维护：一种基于高阶统计的定时提前更新方法
DOI：
10.1109/tits.2021.3131816
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发表时间：
2023-02
影响因子：
8.5
通讯作者：
Wei Wei
中科院分区：
文献类型：
--
作者：
Li Zhen;Yue Wang;Keping Yu;Guangyue Lu;Zahid Mumtaz;Wei Wei
星地一体化车载网络可以为大规模车辆提供无处不在、无限的网络连接，有望在6G支持的智能交通系统（ITS）中发挥重要作用。然而，由于其高动态信道环境和有限的卫星载荷，上行链路同步已成为制约车载通信性能的主要瓶颈。为了保证上行链路同步的可靠性，本文提出了一种有效的定时提前量（TA）更新方法。具体地，首先基于周期性配对探测参考信号（SRS）提出增强的前导码格式，其使得卫星能够以低信令开销连续地跟踪上行链路定时变化。通过充分利用接收到的前导码产生的所有四阶自相关，我们进一步设计了一种新的定时度量，包括相关和差分归一化函数，它能够具有显着增加的相关长度和整形主瓣，相比现有的。理论性能分析表明，该方法不仅显著提高了正确定时指标与错误定时指标之间的类距离，而且在降低计算复杂度的同时，能够实现对多径效应和大载波频偏的免疫。在一个典型的低地球轨道（LEO）的情况下的仿真结果表明，我们的方法在虚警概率，漏检概率，以及定时均方误差方面的优越性。
Satellite-ground integrated vehicular network can provision ubiquitous and unlimited network connectivity for massive vehicles, and is expected to play a vital role in 6G-supported intelligent transportation systems (ITS). However, due to its high-dynamic channel environments and limited satellite payload, the uplink synchronization has become a major bottleneck to restrict vehicular communication performance. Focusing on maintaining reliable uplink synchronization, we propose an efficient timing advance (TA) update approach in this paper. Specifically, an enhanced preamble format is first presented based on the periodical pairing sounding reference signals (SRSs), which enables the satellite to continuously track uplink timing variation with a low signaling overhead. By taking full advantage of all the fourth-order autocorrelation produces from the received preamble, we further design a novel timing metric consisted of the correlation and differential normalization functions, which is capable of having a considerably increased correlation length and shaper mainlobe, as compared to the existing ones. Through theoretical performance analysis, it is indicated that the proposed approach not only notably promotes class distance between the correct and wrong timing indexes, but also can achieve the immunity to multi-path effect and large carrier frequency offset (CFO), while having a reduced computational complexity. Simulation results in a typical low-earth-orbit (LEO) scenario reveal the superiority of our approach in terms of the false alarm probability, the missed detection probability, as well as the timing mean square error.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
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