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IEICE Trans

Ryo TAKAHASHI

Comprehensive Analysis and Evaluation of Single/Multi-User Joint Transmit-Receive Diversity
Fumiyuki ADACHI Ryo TAKAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2025/09/01
Vol. E108-B  No. 9  pp. 1113-1127
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
joint transmit-receive diversity, eigenmode transmission, multi-user MIMO, zero-forcing, 
 Summary | Full Text:PDF
User Scheduling and Clustering for Distributed Antenna Network Using Quantum Computing
Keishi HANAKAGO Ryo TAKAHASHI Takahiro OHYAMA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2023/11/01
Vol. E106-B  No. 11  pp. 1210-1218
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
distributed antenna network, user scheduling, user clustering, antenna allocation, quantum computing, 
 Summary | Full Text:PDF
Optimization of Channel Segregation-Based Fractional Frequency Reuse for Inter-Cell Interference Coordination in Cellular Ultra-Dense RAN
Hidenori MATSUO Ryo TAKAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2023/10/01
Vol. E106-B  No. 10  pp. 997-1003
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
5G advanced systems, radio access network, distributed antenna, fractional frequency reuse, segregation algorithm, 
 Summary | Full Text:PDF
Uplink Postcoding in User-Cluster-Centric Cell-Free Massive MIMO
Ryo TAKAHASHI Hidenori MATSUO Sijie XIA Qiang CHEN Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2023/09/01
Vol. E106-B  No. 9  pp. 748-757
Type of Manuscript:  Special Section PAPER (Special Section on Technologies and Proof-of-Concept Activities for 5G Advanced and 6G)
Category: 
Keyword: 
cell-free massive MIMO, scalability, user-centric, user-cluster-centric, ZF, MMSE, 
 Summary | Full Text:PDF
Joint Multi-Layered User Clustering and Scheduling for Ultra-Dense RAN Using Distributed MIMO
Ryo TAKAHASHI Hidenori MATSUO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 1097-1109
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
radio access network, distributed MIMO, interference coordination, user clustering, scheduling, 
 Summary | Full Text:PDF
Close-Loop Angle Control of Stepper Motor Fed by Power Packets
Shiu MOCHIYAMA Ryo TAKAHASHI Takashi HIKIHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2017/07/01
Vol. E100-A  No. 7  pp. 1571-1574
Type of Manuscript:  LETTER
Category: Systems and Control
Keyword: 
power packet, stepper motor, close-loop control, angle control, 
 Summary | Full Text:PDF
Power Processing for Advanced Power Distribution and Control
Ryo TAKAHASHI Shun-ichi AZUMA Mikio HASEGAWA Hiroyasu ANDO Takashi HIKIHARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2017/06/01
Vol. E100-B  No. 6  pp. 941-947
Type of Manuscript:  POSITION PAPER
Category: Energy in Electronics Communications
Keyword: 
power processing, power packet, quantized control, networking, bio-inspired system, closed system, 
 Summary | Full Text:PDF
Up-Stream Dispatching of Power by Density of Power Packet
Shinya NAWATA Ryo TAKAHASHI Takashi HIKIHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/12/01
Vol. E99-A  No. 12  pp. 2581-2584
Type of Manuscript:  LETTER
Category: Systems and Control
Keyword: 
power packet, up-stream dispatching, router, power density, 
 Summary | Full Text:PDF
Active and Reactive Power in Stochastic Resonance for Energy Harvesting
Madoka KUBOTA Ryo TAKAHASHI Takashi HIKIHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/07/01
Vol. E98-A  No. 7  pp. 1537-1539
Type of Manuscript:  LETTER
Category: Noise and Vibration
Keyword: 
stochastic resonance, white Gaussian noise, energy harvesting, active and reactive power, Fokker-Plank equation, 
 Summary | Full Text:PDF
Realization of Autonomous Clock Synchronization for Power Packet Dispatching
Yanzi ZHOU Ryo TAKAHASHI Takashi HIKIHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/02/01
Vol. E98-A  No. 2  pp. 749-753
Type of Manuscript:  LETTER
Category: Systems and Control
Keyword: 
system modeling, CPPLL, clock synchronization, power packet, 
 Summary | Full Text:PDF
Wavelength-Routed Switching for 25-Gbit/s Optical Packets Using a Compact Transmitter Integrating a Parallel-Ring-Resonator Tunable Laser and an InGaAlAs EAM
Toru SEGAWA Wataru KOBAYASHI Tatsushi NAKAHARA Ryo TAKAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/07/01
Vol. E97-C  No. 7  pp. 719-724
Type of Manuscript:  INVITED PAPER (Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
tunable laser, electro-absorption modulator, optical packet switching, photonic integrated circuits, 
 Summary | Full Text:PDF
A Novel Optoelectronic Serial-to-Parallel Converter for 25-Gbps 32-bit Optical Label Processing
Salah IBRAHIM Hiroshi ISHIKAWA Tatsushi NAKAHARA Yasumasa SUZAKI Ryo TAKAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/07/01
Vol. E97-C  No. 7  pp. 773-780
Type of Manuscript:  Special Section PAPER (Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
optical packet switching, optical packet processing, serial-to-parallel converter, optoelectronic integrated circuit, 
 Summary | Full Text:PDF
Performance Evaluation of CDMA Using Chaotic Spreading Sequence with Constant Power in Indoor Power Line Fading Channels
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/07/01
Vol. E97-A  No. 7  pp. 1619-1622
Type of Manuscript:  LETTER
Category: Nonlinear Problems
Keyword: 
chaos, CDMA, fading, power line channel, 
 Summary | Full Text:PDF
State-Dependence of On-Chip Power Distribution Network Capacitance
Koh YAMANAGA Shiho HAGIWARA Ryo TAKAHASHI Kazuya MASU Takashi SATO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/01/01
Vol. E97-C  No. 1  pp. 77-84
Type of Manuscript:  PAPER
Category: Integrated Electronics
Keyword: 
CMOS logic circuit, state-dependent capacitance model, capacitance measurement, PDN-capacitance, parasitic capacitance, 
 Summary | Full Text:PDF
Monolithically Integrated Wavelength-Routing Switch Using Tunable Wavelength Converters with Double-Ring-Resonator Tunable Lasers
Toru SEGAWA Shinji MATSUO Takaaki KAKITSUKA Yasuo SHIBATA Tomonari SATO Yoshihiro KAWAGUCHI Yasuhiro KONDO Ryo TAKAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/09/01
Vol. E94-C  No. 9  pp. 1439-1446
Type of Manuscript:  PAPER
Category: Optoelectronics
Keyword: 
monolithic integration, photonic integrated circuits, tunable laser, wavelength conversion, all-optical switch, 
 Summary | Full Text:PDF
Linear Time Calculation of On-Chip Power Distribution Network Capacitance Considering State-Dependence
Shiho HAGIWARA Koh YAMANAGA Ryo TAKAHASHI Kazuya MASU Takashi SATO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/12/01
Vol. E93-A  No. 12  pp. 2409-2416
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Device and Circuit Modeling and Analysis
Keyword: 
capacitance, power distribution network, state-dependency, integrated circuit modeling, electromagnetic interference, 
 Summary | Full Text:PDF
Performance Evaluation of Band-Limited Baseband Synchronous CDMA Using Orthogonal ICA Sequences
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/03/01
Vol. E93-A  No. 3  pp. 577-582
Type of Manuscript:  PAPER
Category: Nonlinear Problems
Keyword: 
independent component analysis (ICA), chaos, code division multiple access (CDMA), spreading sequence, band-limited signals, 
 Summary | Full Text:PDF
Performance Analysis of Complex CDMA Using Complex Chaotic Spreading Sequence with Constant Power
Ryo TAKAHASHI Ken UMENO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/12/01
Vol. E92-A  No. 12  pp. 3394-3397
Type of Manuscript:  LETTER
Category: Nonlinear Problems
Keyword: 
chaos, complex code division multiple access, spreading sequence, 
 Summary | Full Text:PDF
High-Speed Optical Packet Processing Technologies for Optical Packet-Switched Networks
Hirokazu TAKENOUCHI Tatsushi NAKAHARA Kiyoto TAKAHATA Ryo TAKAHASHI Hiroyuki SUZUKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/03/01
Vol. E88-C  No. 3  pp. 286-294
Type of Manuscript:  INVITED PAPER (Special Section on Optical Signal-Processing Devices for Photonic Networks)
Category: 
Keyword: 
optical packet switching, optical packet processing, serial-to-parallel converter, parallel-to-serial converter, optical clock-pulse generator, multi-protocol label switching, MPLS, 
 Summary | Full Text:PDF
40-Gbit/s 16-bit Burst Optical Packet Generator Based on Photonic Parallel-to-Serial Conversion
Hirokazu TAKENOUCHI Kiyoto TAKAHATA Tatsushi NAKAHARA Ryo TAKAHASHI Hiroyuki SUZUKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/05/01
Vol. E87-C  No. 5  pp. 825-827
Type of Manuscript:  LETTER
Category: Optoelectronics
Keyword: 
optical packet generation, parallel-to-serial conversion, packet-switched network, metal-semiconductor-metal photodetector, 
 Summary | Full Text:PDF