Research on Extremely Large-scale IRS Assisted Near-field Mobile Communications
Extremely Large-scale Intelligent Reflecting Surface(XL-IRS)has emerged as a key candidate technology for future sixth 6G communication systems,which can cost-effectively achieve intelligent reconfiguration of wireless propagation environment by dynamically adjusting signal reflection,thus greatly improving the performance of future wireless communication systems.Different from existing research works that mainly focus on small-scale IRS assisted communication systems assuming the far-field channel model,we consider in this article a more practical XL-IRS assisted wireless systems under a more accurate near-field channel model.Specifically,we first introduce the importance of considering near-field channel model in XL-IRS assisted communication systems,and then introduce the channel modeling for XL-IRS as well as point out the performance limit under the practical near-field channel model.Secondly,the beam management design for XL-IRS assisted communications is elaborated in detail from three aspects:base station beam alignment,XL-IRS beam training,and beam tracking.Finally,we introduce the new direction of XL-IRS-assisted Integrated Sensing and Communi-cations(ISAC),and elaborate its fundamental design issues and promising solutions.
国家科技期刊平台
NSTL
万方数据
