2020
DOI: 10.1109/lwc.2020.2986290
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Cooperative Double-IRS Aided Communication: Beamforming Design and Power Scaling

Abstract: Intelligent reflecting surface (IRS) is a promising technology to support high performance wireless communication. By adaptively configuring the reflection amplitude and/or phase of each passive reflecting element on it, the IRS can reshape the electromagnetic environment in favour of signal transmission. This letter advances the existing research by proposing and analyzing a double-IRS aided wireless communication system. Under the reasonable assumption that the reflection channel from IRS 1 to IRS 2 is of ra… Show more

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Cited by 217 publications
(185 citation statements)
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“…Furthermore, we define ϑ 0,j as the AoD from the BS to IRS j, ϕ a j,i /ϕ e j,i as the azimuth/elevation AoA at IRS j from node i, and ϑ a i,j /ϑ e i,j as the azimuth/elevation AoD from IRS i to node j. The above AoAs and AoDs can be estimated based on the geometric relationship of the BS, IRSs and users in the system [7] or by integrating sensors to the IRSs.…”
Section: System Model and Beamforming Design A System Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…Furthermore, we define ϑ 0,j as the AoD from the BS to IRS j, ϕ a j,i /ϕ e j,i as the azimuth/elevation AoA at IRS j from node i, and ϑ a i,j /ϑ e i,j as the azimuth/elevation AoD from IRS i to node j. The above AoAs and AoDs can be estimated based on the geometric relationship of the BS, IRSs and users in the system [7] or by integrating sensors to the IRSs.…”
Section: System Model and Beamforming Design A System Modelmentioning
confidence: 99%
“…This is because by carefully deploying the IRSs, strong line-of-sight (LoS) channel can be achieved for inter-IRS links, which can provide more pronounced cooperative passive beamforming (CPB) gains over the conventional single-IRS assisted system. Inspired by this, the authors in [7] first proposed a double-IRS system, where a single-antenna BS serves a single-antenna user through a double-reflection link by two IRSs deployed near the BS and user, respectively. It was shown in [7] that this system provides a CPB gain that increases quartically with the total number of IRS reflecting elements, compared to the quadratic growth of the passive beamforming gain in the conventional single-reflection link.…”
Section: Introductionmentioning
confidence: 99%
“…Since the RIS includes a large number of passive elements, it can profit from the angle-of-arrival (AOA) localization technique in [56] to find ϕ when UE identifies itself by broadcasting the response to the paging message from the associated BS. Moreover, assuming the RIS is equipped with received RF chain, as investigated in [13], [26], the RIS can directly obtain the channel state information (CSI) of BS-RIS and RIS-UE paths to achieve the optimal performance.…”
Section: B Bs-ris and Ris-ue Channel Modelsmentioning
confidence: 99%
“…Transmissions coming from one IRS can leak to others and cause strong inter-IRS interference, impacting the network performance. Such impairment could be mitigated if those IRSs with exceeding levels of interference could work in cooperative mode, as in [14], instead of operating independently. However, the joint coordination of multiple IRSs can trigger an explosion in signaling and processing overhead, which can potentially impact communication latency.…”
Section: Research Challenges and Future Directionsmentioning
confidence: 99%