Summary
International Conference on Emerging Technologies for Communications
2023
Session Number:P2
Session:
Number:P2-20
Considerations on IRS Control Based on Beamforming for
Sub-Terahertz-Band Communications
Shuto Tadokoro, Toshihiko Nishimura, Takanori Sato, Yasutaka Ogawa, Takeo Ohgane, Satoshi Suyama,
pp.-
Publication Date:2023/11/29
Online ISSN:2188-5079
Summary:
6G mobile communication systems require ultra-high-speed transmission over 100 Gbps. To support such high data rates, we need a sub-Terahertz band above 100 GHz where an extremely wide bandwidth is available. Communication in non-line-of-sight is, however, difficult because of significant attenuation. Intelligent reflecting surfaces (IRSs) have recently received much attention to mitigate this issue. We, however, need to control the phases of IRS elements. The authors haveproposed a beamforming-based control method, which does not need channel information. The technique works well because multipath components are few in sub-Terahertz bands. In this paper, we show that even when channel information is available, the performance of IRS control using the channel information is not much better than that of beamforming control because we cannot optimize the IRS phases at every frequency. This highlights the practicality of beamforming-based IRS control.