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Author

Rui-Jie Li

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Open access 2026

Design of Generalized Spatial Modulation for 2-D Pinching-Antenna Systems

Two-dimensional pinching-antenna systems (2D-PASS) provide a flexible transmission architecture by reconfiguring radiation positions over multiple dielectric waveguides. However, the enlarged transmit-state set induced by multi-domain index modulation may generate closely spaced received vectors, hence degrading maximu...

Rui-Jie Li, Yue Xiao, Shuai-Xin Yang et al. · 0 citations
#machine learning Preprint Sep 2026

The Exact Time-Uniform Rate Frontier for Stochastic Gradient Descent on Smooth Convex Objectives

We study the time-uniform convergence of the raw iterate of standard stochastic gradient descent (SGD) for unconstrained smooth convex objectives. We prove that, under standard noise assumptions, the time-uniform convergence rate gets arbitrarily close to $\sqrt{\log n / n}$ but never reaches it. More specifically, we...

Rui-Jie Li, Kang Chen, Tian-Yu Wang · 1 citation

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