50 citations · 76 across the 10 of their papers we have counts for
11 papers
Physical-Layer Aspects of Repeater-Assisted MIMO
Diana P. M. Osorio, Kohei Ueda, Anubhab Chowdhury +4
Network-controlled repeaters (NCRs) are emerg- ing as low-cost, band-selective active scatterers that can re- shape the wireless propagation environment without backhaul or tight p…
On Optimal Strategies for Joint Reciprocity Calibration in Distributed MIMO
Kohei Ueda, Anubhab Chowdhury, Koji Ishibashi +1
This paper investigates the impact of reciprocity calibration errors on the downlink spectral efficiency (SE) of multi-user large antenna systems. Specifically, we consider two cal…
Repeater-Assisted Massive MIMO Downlink Performance with Calibration Errors
Kohei Ueda, Anubhab Chowdhury, Koji Ishibashi +1
Reciprocity-based downlink beamforming is imperative for a scalable time-division duplex massive multiple-input multiple-output~(MIMO) deployment. Specifically, for a dual-antenna…
Repeater-Aided Over-the-Air Phase Synchronization in Distributed MIMO
Unnikrishnan Kunnath Ganesan, Sai Subramanyam Thoota, Erik G. Larsson
Phase synchronization of access points (APs) in a distributed multiple-input multiple-output (D-MIMO) system is critical to leverage the performance benefits of D-MIMO. Existing ov…
On the Performance of Dual-Antenna Repeater Assisted Bi-Static MIMO ISAC
Anubhab Chowdhury, Erik G. Larsson
This paper presents a framework for target detection and downlink data transmission in a repeater-assisted bi-static integrated sensing and communication system. A repeater is an a…
Is Repeater-Assisted Massive MIMO Compatible with Dynamic TDD?
Martin Andersson, Anubhab Chowdhury, Erik G. Larsson
We present a framework for joint amplification and phase shift optimization of the repeater gain in dynamic time-division duplex (TDD) repeater-assisted massive MIMO networks. Repe…
Repeater Swarm-Assisted Cellular Systems: Interaction Stability and Performance Analysis
Jianan Bai, Anubhab Chowdhury, Anders Hansson +1
We consider a cellular massive MIMO system where swarms of wireless repeaters are deployed to improve coverage. These repeaters are full-duplex relays with small form factors that…
Achieving Distributed MIMO Performance with Repeater-Assisted Cellular Massive MIMO
Sara Willhammar, Hiroki Iimori, Joao Vieira +3
In what ways could cellular massive MIMO be improved? This technology has already been shown to bring huge performance gains. However, coverage holes and difficulties to transmit m…
Cell-Free Massive MIMO with Multi-Antenna Users and Phase Misalignments: A Novel Partially Coherent Transmission Framework
Unnikrishnan Kunnath Ganesan, Tung Thanh Vu, Erik G. Larsson
Cell-free massive multiple-input multiple-output (MIMO) is a promising technology for next-generation communication systems. This work proposes a novel partially coherent (PC) tran…
BeamSync: Over-The-Air Synchronization for Distributed Massive MIMO Systems
Unnikrishnan Kunnath Ganesan, Rimalapudi Sarvendranath, Erik G. Larsson
In distributed massive multiple-input multiple-output (MIMO) systems, multiple geographically separated access points (APs) communicate simultaneously with a user, leveraging the b…
Joint Beamforming and Broadcasting in Massive MIMO
Erik G. Larsson, H. Vincent Poor
The downlink of a massive MIMO system is considered for the case in which the base station must concurrently serve two categories of terminals: one group to which imperfect instant…