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Multiple Access in Pinching-Antenna Systems: A Survey, Impairment Analysis, and Evaluation
Wei Jiang, Hans Dieter Schotten
Pinching-antenna systems attach dielectric pinches to a waveguide, creating line-of-sight radiation points within a few meters of any user. The pinches on one waveguide, however, r…
Integrated Sensing and Communications over Hierarchical Cellular and Cell-Free MIMO Systems
Wei Jiang, Hans D. Schotten
This paper studies integrated sensing and communications (ISAC) over a hybrid system that seamlessly combines legacy cellular base stations with distributed cell-free (CF) access p…
Superimposed Transmission for Cooperative Cellular and Cell-Free Massive MIMO Systems
Wei Jiang, Hans D. Schotten
This paper proposes a superimposed transmission strategy for cooperative cellular and cell-free massive MIMO systems. By classifying users into near and far, the base station trans…
Pinching-Antenna-Assisted Terahertz Communications: Modeling and Benchmarking
Wei Jiang, Hans D. Schotten
Pinching antenna systems (PASS) employing dielectric waveguides have recently emerged as a promising flexible antenna architecture for high-frequency wireless communications. While…
Switched-Feed Pinching-Antenna Systems for Wideband Terahertz Communications
Wei Jiang, Hans D. Schotten
The pinching-antenna system (PASS) uses dielectric particles along a low-loss waveguide as reconfigurable passive radiators. Existing analyses conclude that the in-waveguide attenu…
Distributed vs. Centralized Precoding in Cell-Free Systems: Impact of Realistic Per-AP Power Limits
Wei Jiang, Hans D. Schotten
In cell-free massive MIMO, centralized precoding is {theoretically known} to {remarkably} outperform its distributed counterparts, albeit {with} high implementation complexity. How…
A Heterogeneous Massive MIMO Technique for Uniform Service in Cellular Networks
Wei Jiang, Hans D. Schotten
Traditional cellular networks struggle with poor quality of service (QoS) for cell-edge users, while cell-free (CF) systems offer uniform QoS but incur high roll-out costs due to a…