no code implementations • 8 Jan 2023 • Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
We propose a novel, Gaussian signaling mechanism for low probability of detection (LPD) communication systems with either single or multiple antennas.
no code implementations • 24 Feb 2022 • Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
We propose a novel physical layer security scheme that exploits an optimization method as a one-way function.
no code implementations • 27 Sep 2020 • Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, Wei Yu
We propose a novel joint activity, channel, and data estimation (JACDE) scheme for cell-free multiple-input multiple-output (MIMO) systems compliant with fifth-generation (5G) new radio (NR) orthogonal frequency-division multiplexing (OFDM) signaling.
no code implementations • 7 Jun 2020 • Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
We consider a bidirectional in-band full-duplex (FD) multiple-input multiple-output (MIMO) system subject to imperfect channel state information (CSI), hardware distortion, and limited analog cancellation capability as well as the self-interference (SI) power requirement at the receiver analog domain so as to avoid the saturation of low noise amplifier (LNA).
no code implementations • 7 Jun 2020 • Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Koji Ishibashi
We present a novel algorithm for the completion of low-rank matrices whose entries are limited to a finite discrete alphabet.
no code implementations • 21 Jan 2020 • Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Hara Takanori, Koji Ishibashi, Razvan-Andrei Stoica, David Gonzalez G., Andreas Andrae, Osvaldo Gonsa
Simulation results show that the proposed art significantly outperforms both classic receivers, such as the LMMSE, and recent CS-based alternatives, such as the SOAV and the SCSR detectors.