Search Results for author: Naoki Ishikawa

Found 5 papers, 0 papers with code

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

no code implementations5 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.

Optimal but Low-Complexity Optimization Method for Nonsquare Differential Massive MIMO

no code implementations26 May 2023 Yuma Katsuki, Naoki Ishikawa

In this paper, we propose an optimal but low-complexity optimization method for nonsquare differential massive MIMO.

A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications

no code implementations8 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.

Quantum Algorithm for Higher-Order Unconstrained Binary Optimization and MIMO Maximum Likelihood Detection

no code implementations31 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.

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