17 papers
Trade-Offs in Decentralized Gigantic MIMO with Hard-Boundary Constraints
Juan Vidal AlegrÃa, Joao Vieira, Ove Edfors
To maintain the antenna apertures offered by 5G massive MIMO systems operating at the sub-6GHz band, known as FR1, 6G base stations (BSs) using the upper-mid band, FR3, should incr…
Vertical Sub-THz Channel Characterization: Sounder Implementation and Initial Measurements
Ali Al-Ameri, Xuesong Cai, Juan Sanchez +4
We present a measurement-based characterization of indoor vertical ceiling-to-ground sub-THz channels in the 136-144 GHz band, motivated by ceiling-mounted radio-unit deployments f…
A Scalable 256-Antenna Distributed MIMO Testbed with Real-Time Fully Digital Beamforming
Dumitra Iancu, Vilgot Snygg, Sijia Cheng +7
Distributed massive MIMO (D-MIMO) is a promising technology for future generation wireless systems as it takes advantage of both an increased array aperture and a decentralized pro…
Efficient Implementation of an Adaptive Transformer Accelerator for Massive MIMO Outdoor Localization
Ilayda Yaman, Sijia Cheng, Ove Edfors +1
We present the implementation of an adaptive Transformer-based localization system for 5G massive MIMO targeting sub-10ms real-time positioning. The design exploits propagation cha…
Multi-User XR Offloading via Massive MIMO: A System-Level Analysis using a Real-Life Dataset
Love Bárány, Ilayda Yaman, Ove Edfors +2
SLAM is one of the biggest bottlenecks of XR devices, which have strict requirements for latency, power consumption, and user satisfaction. A solution that has been proposed and st…
Zero-Forcing MU-MIMO Precoding under Power Amplifier Non-Linearities
Juan Vidal AlegrÃa, Ashkan Sheikhi, Ove Edfors
In multi-user multiple-input multiple-output (MU-MIMO) systems, the non-linear behavior of the power amplifiers (PAs) may cause degradation of the linear precoding schemes dealing…