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Dynamic Pilot Design for Multicast in the Internet of Vehicles Running at Different Speeds

IEEE INTERNET OF THINGS JOURNAL(2023)

Univ Lincoln | Peking Univ

Cited 0|Views22
Abstract
High mobility of vehicles causes time-frequency selective fading over physical channels within the Internet of Vehicles (IoV). To improve the resource utilization efficiency, a novel transmission strategy, based on dynamic pilot design, is proposed, in this article, to reduce the pilot consumption in doubly selective channel estimation for the multicast to vehicles running at different speeds. As the channel coherence time is mainly influenced by the receiver mobility in the multicast from a base station to vehicles, we define a multicast block as the channel coherence time of the slowest vehicle in the multicast group, where common pilot symbols are shared. Then, the multicast data destined for different vehicles are loaded into the block according to their own channel coherence times. To evaluate the performance and resource utilization of our dynamic pilot design, the metrics of overhead rate, spectral efficiency, and energy efficiency are formulated for the IoV multicast using multiple-input–multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) transmissions. In terms of these three metrics, illustrative numerical results on the comparisons between our dynamic pilot design and the conventional counterpart are provided, which not only substantiate that the former outperforms the latter but also present useful tools and specifications for the pilot design in the IoV multicast using MIMO–OFDM transmissions over doubly selective channels.
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Key words
Channel estimation,Symbols,Vehicle dynamics,Resource management,MIMO communication,OFDM,Dynamic scheduling,Doubly selective channel estimation,dynamic pilot design,energy efficiency,Internet of Vehicles (IoV),overhead rate,spectral efficiency
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要点】:本文提出了一种基于动态导频设计的传输策略,通过优化导频分配,提高在车辆以不同速度行驶的互联网车辆(IoV)中进行多播传输的资源利用效率。

方法】:通过定义多播块为多播组中最慢车辆的信道相干时间,并在此时间段内共享公共导频符号,根据不同车辆各自的信道相干时间,将多播数据加载到相应的块中。

实验】:通过模拟多输入多输出(MIMO)正交频分复用(OFDM)传输的IoV多播场景,使用 overhead rate、spectral efficiency 和 energy efficiency 作为性能评价指标,比较了动态导频设计与传统方法的性能。实验结果表明,所提出的动态导频设计在上述三个指标上均优于传统方法。数据集名称未在文中提及。