Behrooz Makki
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A Screen-printed, Silver-nanowire-based Optically Transparent Wideband Reconfigurable Intelligent Surface for 5G mmWave Applications Open
The reconfigurable intelligent surface (RIS) can help establish secondary line-of-sight links for 5G mmWave and beyond applications to cater for the large path loss and blockage in millimeter-wave direct links. It is desirable that the RIS…
View article: Reconfigurable Intelligent Surfaces-Assisted Integrated Access and Backhaul
Reconfigurable Intelligent Surfaces-Assisted Integrated Access and Backhaul Open
In this paper, we study the impact of reconfigurable intelligent surfaces (RISs) on the coverage extension of integrated access and backhaul (IAB) networks. Particularly, using a finite stochastic geometry model, with random distributions …
View article: Mobility Management in Integrated Sensing and Communications Networks
Mobility Management in Integrated Sensing and Communications Networks Open
The performance of the integrated sensing and communication (ISAC) networks is considerably affected by the mobility of the transceiver nodes, user equipment devices (UEs) and the passive objects that are sensed. For instance, the sensing …
View article: Cellular Network Densification: A System-Level Analysis With IAB, NCR, and RIS
Cellular Network Densification: A System-Level Analysis With IAB, NCR, and RIS Open
As the number of user equipments increases in 5G and beyond, it is desirable to densify the cellular network with auxiliary nodes assisting the base stations. Examples of these nodes include IAB nodes, NCR and RIS. In this context, this wo…
View article: Load Balancing-based Topology Adaptation for Integrated Access and Backhaul Networks
Load Balancing-based Topology Adaptation for Integrated Access and Backhaul Networks Open
Integrated access and backhaul (IAB) technology is a flexible solution for network densification. IAB nodes can also be deployed in moving nodes such as buses and trains, i.e., mobile IAB (mIAB). As mIAB nodes can move around the coverage …
View article: RIS-Assisted Sensing: A Nested Tensor Decomposition-Based Approach
RIS-Assisted Sensing: A Nested Tensor Decomposition-Based Approach Open
We study a monostatic multiple-input multiple-output sensing scenario assisted by a reconfigurable intelligent surface using tensor signal modeling. We propose a method that exploits the intrinsic multidimensional structure of the received…
View article: Structured Channel Estimation for RIS-Assisted THz Communications
Structured Channel Estimation for RIS-Assisted THz Communications Open
This paper proposes tensor-based channel estimation for reconfigurable intelligent surface (RIS)-assisted communication networks. We exploit the inherent geometrical structure of the Terahertz propagation channel, including the antenna arr…
View article: Joint User Detection and Localization in Near-Field Using Reconfigurable Intelligent Surfaces
Joint User Detection and Localization in Near-Field Using Reconfigurable Intelligent Surfaces Open
This letter studies the problem of detecting active user equipment devices (UEs) and localization in the near field, wherein the base station (BS) is unaware of the number of active (or inactive) UEs and their positions. The system is equi…
View article: Load Balancing-based Topology Adaptation for Integrated Access and Backhaul Networks
Load Balancing-based Topology Adaptation for Integrated Access and Backhaul Networks Open
Integrated access and backhaul (IAB) technology is a flexible solution for network densification. IAB nodes can also be deployed in moving nodes such as buses and trains, i.e., mobile IAB (mIAB). As mIAB nodes can move around the coverage …
View article: Cellular Network Densification: a System-level Analysis with IAB, NCR and RIS
Cellular Network Densification: a System-level Analysis with IAB, NCR and RIS Open
As the number of user equipments increases in fifth generation (5G) and beyond, it is desired to densify the cellular network with auxiliary nodes assisting the base stations. Examples of these nodes are integrated access and backhaul (IAB…
View article: Low-Complexity Tensor-Based Monostatic Sensing for IRS-Assisted Communication Systems
Low-Complexity Tensor-Based Monostatic Sensing for IRS-Assisted Communication Systems Open
This paper proposes a tensor-based parameter estimation algorithm for sensing in an intelligent reflecting surface-assisted system. We present a higher-order singular value decomposition-based solution that exploits the tensor structure of…
View article: Impact of Network Deployment on the Performance of NCR-assisted Networks
Impact of Network Deployment on the Performance of NCR-assisted Networks Open
To address the need of coverage enhancement in the fifth generation (5G) of wireless cellular telecommunications, while taking into account possible bottlenecks related to deploying fiber based backhaul (e.g., required cost and time), the …
View article: Adaptive Downlink Localization in Near-Field and Far-Field
Adaptive Downlink Localization in Near-Field and Far-Field Open
This paper considers the problem of downlink localization of user equipment devices (UEs) that are either in the near-field (NF) or in the far-field (FF) of the array of the serving base station (BS). We propose a dual signaling scheme, wh…
A Fully Screen-Printed Vanadium-Dioxide Switches Based Wideband Reconfigurable Intelligent Surface for 5G Bands Open
Reconfigurable Intelligent Surface (RIS) is attracting more and more research interest because of its ability to reprogram the radio environment. Designing and implementing the RIS, however, is challenging because of limitations of printed…
View article: Extended Automatic Repeat Request For Integrated Sensing And Communication Networks
Extended Automatic Repeat Request For Integrated Sensing And Communication Networks Open
6G wireless networks will integrate communication, computing, localization, and sensing capabilities while meeting the needs of high reliability and trustworthiness.In this paper, we develop similar techniques as those used by communicatio…
View article: Extended Automatic Repeat Request For Integrated Sensing And Communication Networks
Extended Automatic Repeat Request For Integrated Sensing And Communication Networks Open
6G wireless networks will integrate communication, computing, localization, and sensing capabilities while meeting the needs of high reliability and trustworthiness. In this paper, we develop similar techniques as those used by communicati…
RIS in Cellular Networks -- Challenges and Issues Open
Reconfigurable intelligent surface (RIS) has been suggested to be a key 6G feature and was suggested to be considered as a study-item in both 3GPP Releases 18 and 19. However, in both releases, it has been decided not to continue with it a…
Uplink soft handover for LEO constellations: how strong the inter-satellite link should be Open
We consider a constellation of low-earth-orbit (LEO) satellites connected to a handheld device on the ground. Due to the very large orbital speed, an effective handover strategy becomes of paramount importance. In particular, we study the …
View article: Network-Controlled Repeater -- An Introduction
Network-Controlled Repeater -- An Introduction Open
In fifth generation (5G) wireless cellular networks, millimeter wave spectrum opens room for several potential improvements in throughput, reliability, latency, among other aspects. However, it also brings challenges, such as a higher infl…
View article: Beam Squinting Compensation: An NCR-Assisted Scenario
Beam Squinting Compensation: An NCR-Assisted Scenario Open
Millimeter wave (mmWave) and sub-THz communications, foreseen for sixth generation (6G), suffer from high propagation losses which affect the network coverage. To address this point, smart entities such as network-controlled repeaters (NCR…
View article: Adaptive Downlink Localization and User Tracking in Near-Field and Far-Field: A Trade-Off Analysis
Adaptive Downlink Localization and User Tracking in Near-Field and Far-Field: A Trade-Off Analysis Open
This paper considers the problem of downlink localization and user equipments (UEs) tracking with an adaptive procedure for a range of distances. We provide the base station (BS) with two signaling schemes and the UEs with two localization…
View article: Joint User Detection and Localization in Near-Field Using Reconfigurable Intelligent Surfaces
Joint User Detection and Localization in Near-Field Using Reconfigurable Intelligent Surfaces Open
This letter studies the problem of jointly detecting active user equipments (UEs) and estimating their location in the near field, wherein the base station (BS) is unaware of the number of active (or inactive) UEs and their positions. The …
High-Rate Reliable Communication Using Multi-Hop and Mesh THz/FSO Networks Open
In this work, we consider multi-hop and mesh hybrid teraHertz/free-space optics (THz/FSO)-based backhaul networks for high data-rate communications. The results are presented for the cases with both out-band integrated access and backhaul …
Multi-hop Sub-THz-FSO: A Technique for High-rate Uninterrupted Backhauling in 6G Open
Moving towards $6^{\text{th}}$ generation (6G), backhaul networks require significant improvements to support new use-cases with restricted joint capacity and availability requirements. In this paper, we investigate the potentials and chal…
View article: Beamforming in Wireless Coded-Caching Systems
Beamforming in Wireless Coded-Caching Systems Open
Increased capacity in the access network poses capacity challenges on the transport network due to the aggregated traffic. However, there are spatial and time correlation in the user data demands that could potentially be utilized. To that…
Interference mitigation with block diagonalization for IRS-aided MU-MIMO communications Open
This work investigates interference mitigation techniques in multi-user multiple input multiple output (MU-MIMO) Intelligent Reflecting Surface (IRS)-aided networks, focusing on the base station end. Two methods of precoder design based on…
Tensor-based modeling/estimation of static channels in IRS-assisted MIMO systems Open
This paper proposes a tensor-based parametric modeling and estimation framework in multiple-input multiple-output (MIMO) systems assisted by intelligent reflecting surfaces (IRSs). We present two algorithms that exploit the tensor structur…
View article: System Level Evaluation of Network-Controlled Repeaters: Performance Improvement of Serving Cell and Interference Impact on Neighbor Cells
System Level Evaluation of Network-Controlled Repeaters: Performance Improvement of Serving Cell and Interference Impact on Neighbor Cells Open
Heterogeneous networks have been studied as one of the enablers of network densification. These studies have been intensified to overcome some drawbacks related to propagation in millimeter waves (mmWaves), such as severe path and penetrat…