Boosting Spectral Efficiency with Data-Carrying Reference Signals on the Grassmann Manifold

no code implementations • 5 Jan 2024 • Naoki Endo, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa

In wireless networks, frequent reference signal transmission for accurate channel reconstruction may reduce spectral efficiency.

Isometric Embeddability of $S_q^m$ into $S_p^n$

no code implementations • 30 Aug 2020 • Arup Chattopadhyay, Guixiang Hong, Avijit Pal, Chandan Pradhan, Samya Kumar Ray

We also show that whenever $S_q$ embeds isometrically into $S_p$ for $(q, p)\in \left(1,\infty\right)\times\left[2,\infty \right)\cup[4,\infty)\times\{1\} \cup\{\infty\}\times\left( 1,\infty\right)\cup[2,\infty)\times\{\infty\}$ with $p\neq q,$ we must have $q=2.$ Thus, our work complements work of Junge, Parcet, Xu and others on isometric and almost isometric embedding theory on non-commutative $L_p$-spaces.

Functional Analysis Operator Algebras 46B04, 46L51, 15A60, 47A55

Reconfigurable Intelligent Surface (RIS)-Enhanced Two-Way OFDM Communications

no code implementations • 5 May 2020 • Chandan Pradhan, Ang Li, Lingyang Song, Jun Li, Branka Vucetic, Yonghui Li

In this paper, we focus on the reconfigurable intelligent surface (RIS)-enhanced two-way device-to-device (D2D) multi-pair orthogonal-frequency-division-multiplexing (OFDM) communication systems.

Vocal Bursts Valence Prediction