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SCIENTIA SINICA Informationis, Volume 50 , Issue 9 : 1377(2020) https://doi.org/10.1360/SSI-2020-0086

Shannon theory and future 6G's technique potentials

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  • ReceivedApr 9, 2020
  • AcceptedApr 21, 2020
  • PublishedSep 23, 2020

Abstract

From the perspective of Shannon theory and its extensions, this paper is devoted to evaluate the technique potentials of the future 6G mobile communication system. First, the classic Shannon theory framework, including the performance tradeoff between block length, data rate, and reliability, is summarized, and the limitations of its application in the contemporary mobile communication system are addressed. Second, the multiple-input-multiple-output (MIMO) extension of classic Shannon theory is described, which plays fundamental roles in the development of contemporary mobile communication systems. Moreover, because Shannon theory and its MIMO extension are nonconstructive in nature, two kinds of constructive capacity-approaching mechanisms, namely, channel polarization and eigen-mode wireless transmission, are also introduced. Furthermore, aiming at higher spectrum efficiency and power efficiency, higher reliability and lower latency, and higher frequency band, which are essential indicators of future 6G, the technique potentials are theoretically discussed from the perspective of Shannon theory framework. It reveals that by introducing more antennas together with the innovation of cell-free network architecture and by making an effective balance between block length, error probability, data rate, and the minimum number of antennas, future 6G technology still has great potential to be improved. However, a compromise between system performance and deployment cost must be made, and the special features of MIMO channels in higher frequency bands must be carefully utilized. Finally, several fundamental issues related to future 6G development are summarized.


Funded by

科技部6G专项计划

东南大学十大科学技术问题研究计划和紫金山实验室普适通信研究项目


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