致谢：
我们要感谢贝尔实验室的许多同事，我们与他们就6G进行了无数次讨论。特别要感谢Harri Holma、Peter Merz、Mikko Uusitalo、Peter Vetter、Thorsten Wild和Volker Ziegler对本文初稿的给出的修改意见。特别感谢Amanda Hu和Ramoni Adeogun帮助我们编写手稿。
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