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.
no code implementations • 26 May 2023 • Yuma Katsuki, Naoki Ishikawa
In this paper, we propose an optimal but low-complexity optimization method for nonsquare differential massive MIMO.
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 • 31 May 2022 • Masaya Norimoto, Ryuhei Mori, Naoki Ishikawa
In this paper, we propose a quantum algorithm that supports a real-valued higher-order unconstrained binary optimization (HUBO) problem.
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.