Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

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The 2017 GMC Terrain remains unchanged for the exception of a new Nightfall appearance package that comes with 18-inch machine-faced aluminum wheels with gloss black spokes and other black trim ...

Abstract: The rapid development of VR technology laid the foundation for the emergence of virtual reality systems. The Virtual campus roaming system plays an important role in the process of college ...