Wei Jiang

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…

What is the Most Efficient Technique for Uplink Cell-Free Massive MIMO?

Wei Jiang, Hans D. Schotten

This paper seeks to determine the most efficient uplink technique for cell-free massive MIMO systems. Despite offering great advances, existing works suffer from fragmented methodo…

Achieving Optimal Performance-Cost Trade-Off in Hierarchical Cell-Free Massive MIMO

Wei Jiang, Hans D Schotten

Cell-free (CF) massive MIMO offers uniform service via distributed access points (APs), which impose high deployment costs. A novel design called hierarchical cell-free (HCF) addre…

Heterogeneous Massive MIMO: A Cost-Efficient Technique for Uniform Service in Cellular Networks

Wei Jiang, Hans D. Schotten

Massive multi-input multi-output (MIMO) has evolved along two tracks: cellular and cell-free, each with unique advantages and limitations. The cellular approach suffers from worse…

Nonlinear Power Amplifier-Resilient Cell-Free Massive MIMO: A Joint Optimization Approach

Wei Jiang, Hans D. Schotten

This letter analyzes the effects of power amplifiers (PAs) on the downlink of cell-free massive MIMO systems. We model signal transmission incorporating nonlinear PA distortion and…

Hierarchical Cell-Free Massive MIMO: A Simplified Design for Uniform Service Quality

Wei Jiang, Hans Dieter Schotten

In traditional cellular networks, users at the cell edge often suffer from poor quality of service (QoS) due to large distance-dependent path loss and severe inter-cell interferenc…

A Frequency-Domain Opportunistic Approach for Spectral-Efficient Cell-Free Massive MIMO

Wei Jiang, Hans Dieter Schotten

Constrained by weak signal strength and significant inter-cell interference, users located at the cell edge in a cellular network suffer from inferior service quality. Recently, ce…

Heterogeneous System Design for Cell-Free Massive MIMO in Wideband Communications

Wei Jiang, Hans D. Schotten

Cell-free massive multi-input multi-output (CFmMIMO) offers uniform service quality through distributed access points (APs), yet unresolved issues remain. This paper proposes a het…

Cost-Effectiveness Analysis and Design of Cost-Efficient Cell-Free Massive MIMO Systems

Wei Jiang, Hans D. Schotten

Cell-free massive multi-input multi-output (MIMO) has recently attracted much attention, attributed to its potential to deliver uniform service quality. However, the adoption of a…

A Review of Multiple Access Techniques for Intelligent Reflecting Surface-Assisted Systems

Wei Jiang, Hans Schotten

Intelligent Reflecting Surface (IRS) is envisioned to be a technical enabler for the sixth-generation (6G) wireless system. Its potential lies in delivering high performance while…

Unified Modeling and Performance Comparison for Cellular and Cell-Free Massive MIMO

Wei Jiang, Hans D. Schotten

Cell-free massive multi-input multi-output (MIMO) has recently gained a lot of attention due to its high potential in sixth-generation (6G) wireless systems. The goal of this paper…

Cell-Free Terahertz Massive MIMO: A Novel Paradigm Beyond Ultra-Massive MIMO

Wei Jiang, Hans D. Schotten

Terahertz (THz) frequencies have recently garnered considerable attention due to their potential to offer abundant spectral resources for communication, as well as distinct advanta…

Hierarchical Cell-Free Massive MIMO for High Capacity with Simple Implementation

Wei Jiang, Hans D. Schotten

Cell-free massive multi-input multi-output (MIMO) has recently gained much attention for its potential in shaping the landscape of sixth-generation (6G) wireless systems. This pape…