65 citations · 156 across the 21 of their papers we have counts for
21 papers
Hypertracking and Hyperrejection: Control of Signals beyond the Nyquist Frequency
Kaoru Yamamoto, Yutaka Yamamoto, Masaaki Nagahara
This paper studies the problem of signal tracking and disturbance rejection for sampled-data control systems, where the pertinent signals can reside beyond the so-called Nyquist fr…
Stability Analysis of Perturbed Infinite-dimensional Sampled-data Systems
Masashi Wakaiki, Yutaka Yamamoto
This paper addresses the stability analysis of infinite-dimensional sampled-data systems under unbounded perturbations. We present two classes of unbounded perturbations preserving…
Stabilization of discrete-time piecewise affine systems with quantized signals
Masashi Wakaiki, Yutaka Yamamoto
This paper studies quantized control for discrete-time piecewise affine systems. For given stabilizing feedback controllers, we propose an encoding strategy for local stability. If…
Stability analysis of sampled-data switched systems with quantization
Masashi Wakaiki, Yutaka Yamamoto
We propose a stability analysis method for sampled-data switched linear systems with finite-level static quantizers. In the closed-loop system, information on the active mode of th…
Stabilization of continuous-time switched linear systems with quantized output feedback
Masashi Wakaiki, Yutaka Yamamoto
In this paper, we study the problem of stabilizing continuous-time switched linear systems with quantized output feedback. We assume that the observer and the control gain are give…
Digital Cancelation of Self-Interference for Single-Frequency Full-Duplex Relay Stations via Sampled-Data Control
Hampei Sasahara, Masaaki Nagahara, Kazunori Hayashi +1
In this article, we propose sampled-data design of digital filters that cancel the continuous-time effect of coupling waves in a single-frequency full-duplex relay station. In this…
Sampled-data Optimization for Self-interference Suppression in Baseband Signal Subspaces
Hampei Sasahara, Masaaki Nagahara, Kazunori Hayashi +1
In this article, we propose a design method of selfinterference cancelers for wireless relay stations taking account of the baseband signal subspace. The problem is first formulate…
Communication Performance Analysis of Sampled-Data H-infinity Optimal Coupling Wave Canceler
Hampei Sasahara, Masaaki Nagahara, Kazunori Hayashi +1
In this manuscript, we propose a design method of digital filters which cancel coupling waves generated in single-frequency full-duplex wireless relay stations by using the sampled…
Output Feedback Stabilization of Switched Linear Systems with Limited Information
Masashi Wakaiki, Yutaka Yamamoto
We propose an encoding and control strategy for the stabilization of switched systems with limited information, supposing the controller is given for each mode. Only the quantized…
Loop-Back Interference Suppression for OFDM Signals via Sampled-Data Control
Hampei Sasahara, Masaaki Nagahara, Kazunori Hayashi +1
In this article, we consider the problem of loop-back interference suppression for orthogonal frequency division multiplexing (OFDM) signals in amplify-and-forward single-frequency…
Sampled-Data H-infinity Design of Coupling Wave Cancelers in Single-Frequency Full-Duplex Relay Stations
Masaaki Nagahara, Hampei Sasahara, Kazunori Hayashi +1
In this article, we propose sampled-data H-infinity design of digital filters that cancel the continuous-time effect of coupling waves in a single-frequency full-duplex relay stati…
FIR Digital Filter Design by Sampled-Data H-infinity Discretization
Masaaki Nagahara, Yutaka Yamamoto
FIR (finite impulse response) digital filter design is a fundamental problem in signal processing. In particular, FIR approximation of analog filters (or systems) is ubiquitous not…
Quantized Output Feedback Stabilization of Switched Linear Systems
Masashi Wakaiki, Yutaka Yamamoto
This paper studies the problem of stabilizing a continuous-time switched linear system by quantized output feedback. We assume that the quantized outputs and the switching signal a…
Quantized Feedback Stabilization of Sampled-Data Switched Linear Systems
Masashi Wakaiki, Yutaka Yamamoto
We propose a stability analysis method for sampled-data switched linear systems with quantization. The available information to the controller is limited: the quantized state and s…
Active Noise Control with Sampled-Data Filtered-x Adaptive Algorithm
Masaaki Nagahara, Ken-ichi Hamaguchi, Yutaka Yamamoto
Analysis and design of filtered-x adaptive algorithms are conventionally done by assuming that the transfer function in the secondary path is a discrete-time system. However, in re…
H-infinity Design of Periodically Nonuniform Interpolation and Decimation for Non-Band-Limited Signals
Masaaki Nagahara, Masaki Ogura, Yutaka Yamamoto
In this paper, we consider signal interpolation of discrete-time signals which are decimated nonuniformly. A conventional interpolation method is based on the sampling theorem, and…
H-infinity Optimal Approximation for Causal Spline Interpolation
Masaaki Nagahara, Yutaka Yamamoto
In this paper, we give a causal solution to the problem of spline interpolation using H-infinity optimal approximation. Generally speaking, spline interpolation requires filtering…
Signal Reconstruction via H-infinity Sampled-Data Control Theory: Beyond the Shannon Paradigm
Yutaka Yamamoto, Masaaki Nagahara, Pramod P. Khargonekar
This paper presents a new method for signal reconstruction by leveraging sampled-data control theory. We formulate the signal reconstruction problem in terms of an analog performan…
H-Infinity-Optimal Fractional Delay Filters
Masaaki Nagahara, Yutaka Yamamoto
Fractional delay filters are digital filters to delay discrete-time signals by a fraction of the sampling period. Since the delay is fractional, the intersample behavior of the ori…
Frequency Domain Min-Max Optimization of Noise-Shaping Delta-Sigma Modulators
Masaaki Nagahara, Yutaka Yamamoto
This paper proposes a min-max design of noise-shaping delta-sigma modulators. We first characterize the all stabilizing loop-filters for a linearized modulator model. By this chara…
Optimal Discretization of Analog Filters via Sampled-Data H-infinity Control Theory
Masaaki Nagahara, Yutaka Yamamoto
In this article, we propose optimal discretization of analog filters (or controllers) based on the theory of sampled-data H-infinity control. We formulate the discretization proble…