arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2103.03753cs.ITmath.IT
收藏

可重构智能表面辅助无线网络信道互易性研究

On Channel Reciprocity in Reconfigurable Intelligent Surface Assisted Wireless Network

Wankai Tang, Xiangyu Chen, Ming Zheng Chen, Jun Yan Dai, Yu Han, Shi Jin, Qiang Cheng, Geoffrey Ye Li, Tie Jun Cui

摘要:

信道互易性极大地促进了时分双工(TDD)多输入多输出(MIMO)通信中的下行链路预编码,而不需要信道状态信息(CSI)反馈。最近,可重构智能表面(RISs)作为一种有前途的技术,以提高未来的无线网络的性能出现。然而,由于RIS的人工电磁特性并不严格遵循正常的自然规律,这就提出了一个问题:信道互易性在RIS辅助的TDD无线网络中是否成立?在简要回顾了互易定理之后,本文证明了在满足一定条件的RI辅助无线网络中仍然存在信道互易性。我们还通过实验证明了在6 GHz以下和毫米波频段的互易性,通过使用两个制造的RIS。此外,我们还介绍了几种实现非互易通道的RIS辅助方法。最后,互惠/非互惠RISs带来的潜在机会和未来的研究方向进行了概述。

英文摘要:

Channel reciprocity greatly facilitates downlink precoding in time-division duplexing (TDD) multiple-input multiple-output (MIMO) communications without the need for channel state information (CSI) feedback. Recently, reconfigurable intelligent surfaces (RISs) emerge as a promising technology to enhance the performance of future wireless networks. However, since the artificial electromagnetic characteristics of RISs do not strictly follow the normal laws of nature, it brings up a question: does the channel reciprocity hold in RIS-assisted TDD wireless networks? After briefly reviewing the reciprocity theorem, in this article, we show that there still exists channel reciprocity for RIS-assisted wireless networks satisfying certain conditions. We also experimentally demonstrate the reciprocity at the sub-6 GHz and the millimeter-wave frequency bands by using two fabricated RISs. Furthermore, we introduce several RIS-assisted approaches to realizing nonreciprocal channels. Finally, potential opportunities brought by reciprocal/nonreciprocal RISs and future research directions are outlined.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑