which means another IRS receives the signal from the first one and sends the signal toward another one and so on.
Dear Abbas!
A lot of new and relevant research papers are available related with IRS and its interesting application in 5G and 6G ( mmWave or THz / Sub- THz) communication system.
You have to beging your search with metasurface material and it's working principles followed by Artificial intelligence.
Your question covers a wide range of technology.so , it is better to explore by yourself.
Yes! If you have some specific problem in this case you can take the help.
Dear Abbas Thajeel Rhaif Alsahlanee ,
Welcome!
As far as I understand the IRS is one hop network component. If the path from the source to destination has low transmission coefficient such as deep fading of massive blocking then one can use one ore two IRSs to convey the signal to the intended receiver or destinations.
Incase of more that one IRS all of them receive their incident waves from the intial source such as the base station. I think multi hops may cause excessive delay.
Best wishes.
Dear Abbas Thajeel Alsahlanee,
IRS is a type of relay which may be used in multi-hop. You may refer to https://arxiv.org/abs/2102.03581v2 for more detail.
Yes, it possible. I agree with Anil Kamboj , that IRS can be used as a smart retranslator for multiple retranslation nodes. On the other hand, the use of multiple IRSs can give the effect of not-controlled multipath signals.
We worked out a similar setup except we have a relay node in between, if you are interested please check out Article Spatially Correlated Dual Hop RIS Aided Next Generation Wire...
Multi-Beam Multi-Hop Routing for Intelligent Reflecting Surfaces Aided Massive MIMO
Weidong Mei, Rui Zhang
Intelligent reflecting surface (IRS) is envisioned to play a significant role in future wireless communication systems as an effective means of reconfiguring the radio signal propagation environment. In this paper, we study a new multi-IRS aided massive multiple-input multiple-output (MIMO) system, where a multi-antenna BS transmits independent messages to a set of remote single-antenna users using orthogonal beams that are subsequently reflected by different groups of IRSs via their respective multi-hop passive beamforming over pairwise line-of-sight (LoS) links. We aim to select optimal IRSs and their beam routing path for each of the users, along with the active/passive beamforming at the BS/IRSs, such that the minimum received signal power among all users is maximized. This problem is particularly difficult to solve due to a new type of path separation constraints for avoiding the IRS-reflected signal induced interference among different users. To tackle this difficulty, we first derive the optimal BS/IRS active/passive beamforming solutions based on their practical codebooks given the reflection paths. Then we show that the resultant multi-beam multi-hop routing problem can be recast as an equivalent graph-optimization problem, which is however NP-complete. To solve this challenging problem, we propose an efficient recursive algorithm to partially enumerate the feasible routing solutions, which is able to effectively balance the performance-complexity trade-off. Numerical results demonstrate that the proposed algorithm achieves near-optimal performance with low complexity and outperforms other benchmark schemes. Useful insights into the optimal multi-beam multi-hop routing design are also drawn under different setups of the multi-IRS aided massive MIMO network.
Preprint Multi-Beam Multi-Hop Routing for Intelligent Reflecting Surf...
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