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Atsushi OHTA

Spectral Efficiency Improvement of Fractional Frequency Reuse by Inter-Cell Interference Cancellation on Cooperative Base Station Kazuki MARUTA Atsushi OHTA Masataka IIZUKA Takatoshi SUGIYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2012/06/01 Vol. E95-B No. 6 pp. 2164-2168 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: inter-cell interference cancellation, base station cooperation, fractional frequency reuse,
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Verifying Structurally Weakly Persistent Net Is Co-NP Complete Atsushi OHTA Kohkichi TSUJI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2011/12/01 Vol. E94-A No. 12 pp. 2832-2835 Type of Manuscript: Special Section LETTER (Special Section on Mathematical Systems Science and its Applications) Category: Keyword: concurrent system, Petri net, subclass, computational complexity,
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Computational Complexity of Liveness Problem of Normal Petri Net Atsushi OHTA Kohkichi TSUJI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2009/11/01 Vol. E92-A No. 11 pp. 2717-2722 Type of Manuscript: Special Section PAPER (Special Section on Theory of Concurrent Systems and its Applications) Category: Keyword: concurrent system, Petri net, liveness, computational complexity,
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A New User Selection Measure in Block Diagonalization Algorithm for Multiuser MIMO Systems Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA Masato MIZOGUCHI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2009/10/01 Vol. E92-B No. 10 pp. 3206-3218 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: multiuser MIMO, user selection, block diagonalization, channel capacity,
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Antenna Selection Method for Terminal Antennas Employing Orthogonal Polarizations and Patterns in Outdoor Multiuser MIMO System Naoki HONMA Riichi KUDO Kentaro NISHIMORI Yasushi TAKATORI Atsushi OHTA Shuji KUBOTA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2008/06/01 Vol. E91-B No. 6 pp. 1752-1759 Type of Manuscript: Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation) Category: Smart Antennas & MIMO Keyword: MIMO, multiuser, urban environment, polarization, pattern, antenna selection,
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New Downlink Beamforming Method for Cooperative Multiple Access Point Systems Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/09/01 Vol. E90-B No. 9 pp. 2303-2311 Type of Manuscript: Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation) Category: Smart Antennas Keyword: MIMO, downlink, beamforming, multiple access point system,
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New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO Yasushi TAKATORI Riichi KUDO Atsushi OHTA Koichi ISHIHARA Kentaro NISHIMORI Shuji KUBOTA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/09/01 Vol. E90-B No. 9 pp. 2312-2320 Type of Manuscript: Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation) Category: Smart Antennas Keyword: multiuser MIMO, uplink, beamforming, frequency offset,
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A Simple and Feasible Decision-Feedback Channel Tracking Scheme for MIMO-OFDM Systems Yusuke ASAI Wenjie JIANG Takeshi ONIZAWA Atsushi OHTA Satoru AIKAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/05/01 Vol. E90-B No. 5 pp. 1052-1060 Type of Manuscript: Special Section PAPER (Special Section on Advanced Transfer Technologies for the Next Generation Network) Category: Keyword: MIMO, OFDM, channel tracking, channel estimation, Doppler frequency, IEEE 802.11n, wireless LAN, frame aggregation,
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A Synchronization Scheme for Packet Mode MIMO-OFDM Signals in Wireless LAN Takeshi ONIZAWA Takafumi FUJITA Yusuke ASAI Daisei UCHIDA Atsushi OHTA Satoru AIKAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/01/01 Vol. E90-B No. 1 pp. 92-104 Type of Manuscript: PAPER Category: Terrestrial Radio Communications Keyword: wireless LAN, MIMO, OFDM, packet mode, synchronization,
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FPGA Implementation of Eigenbeam MIMO-OFDM for Wireless LAN and Its Experimental Performance Takeshi ONIZAWA Atsushi OHTA Yusuke ASAI Satoru AIKAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3233-3241 Type of Manuscript: Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications) Category: Keyword: software-defined radio, field programmable gate array, MIMO-OFDM, eigenbeam, wireless LAN,
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FOREWORD Atsushi OHTA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2006/11/01 Vol. E89-A No. 11 pp. 3165-3165 Type of Manuscript: FOREWORD Category: Keyword:
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A Simplified Maximum Likelihood Detector for OFDM-SDM Systems in Wireless LAN Wenjie JIANG Takeshi ONIZAWA Atsushi OHTA Satoru AIKAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2005/06/01 Vol. E88-B No. 6 pp. 2427-2437 Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation) Category: Keyword: OFDM-SDM, MLD, ZF, complexity reduction, WLAN,
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A Reduced-Complexity Signal Detection Scheme Employing ZF and K-Best Algorithms for OFDM/SDM Takafumi FUJITA Atsushi OHTA Takeshi ONIZAWA Takatoshi SUGIYAMA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2005/01/01 Vol. E88-B No. 1 pp. 66-75 Type of Manuscript: Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1) Category: Space Division Multiplexing Keyword: OFDM, SDM, MIMO, MLD, Zero-Forcing, K-best, M-algorithm, IEEE 802.11a,
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FOREWORD Atsushi OHTA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2004/04/01 Vol. E87-A No. 4 pp. 773-773 Type of Manuscript: FOREWORD Category: Keyword:
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A Scheme to Evaluate Cell Throughput of Multi-Rate Wireless LAN Systems with CSMA/CA Takafumi FUJITA Takeshi ONIZAWA Satoru HORI Atsushi OHTA Satoru AIKAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2004/04/01 Vol. E87-B No. 4 pp. 880-890 Type of Manuscript: PAPER Category: Wireless Communication Technology Keyword: wireless LANs, OFDM, CSMA/CA, cell throughput, system capacity,
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NP-Hardness of Liveness Problem of Bounded Asymmetric Choice Net Atsushi OHTA Kohkichi TSUJI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2002/05/01 Vol. E85-A No. 5 pp. 1071-1074 Type of Manuscript: Special Section LETTER (Special Section on Discrete Mathematics and Its Applications) Category: Keyword: concurrent system, Petri net, liveness, computational complexity,
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Polynomial Time Decidability of Monotone Liveness of Time Bounded AC/DC Nets Atsushi OHTA Kohkichi TSUJI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/11/01 Vol. E84-A No. 11 pp. 2865-2870 Type of Manuscript: Special Section PAPER (Special Section on Concurrent Systems Technology) Category: Keyword: concurrent system, Petri net, liveness, computational complexity,
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PRIME ARQ: A Novel ARQ Scheme for High-Speed Wireless ATM Atsushi OHTA Masafumi YOSHIOKA Masahiro UMEHIRA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2001/03/01 Vol. E84-B No. 3 pp. 474-483 Type of Manuscript: Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21^st Century) Category: Keyword: ARQ, wireless ATM, quality of service (QoS), selective repeat ARQ, error compensation,
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Turing Machine Equivalence of Time Asymmetric Choice Nets Atsushi OHTA Kohkichi TSUJI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2000/11/20 Vol. E83-A No. 11 pp. 2278-2281 Type of Manuscript: Special Section LETTER (Special Section on Concurrent Systems Technology) Category: Keyword: time Petri net, Turing machines, decidability,
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On Liveness of Extended Partially Ordered Condition Nets Atsushi OHTA Kohkichi TSUJI Tomiji HISAMURA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1999/11/20 Vol. E82-A No. 11 pp. 2576-2578 Type of Manuscript: Special Section LETTER (Special Section on Concurrent Systems Technology) Category: Keyword: Petri net, liveness, siphon, trap,
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On Liveness of Time POC Nets with the Static Fair Condition Atsushi OHTA Tomiji HISAMURA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1999/08/20 Vol. E82-A No. 8 pp. 1648-1655 Type of Manuscript: PAPER Category: Concurrent Systems Keyword: concurrent system, time Petri net, subclass, liveness,
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An Algebraic Criterion for State Machine Allocatable Nets Atsushi OHTA Tomiji HISAMURA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1998/04/20 Vol. E81-A No. 4 pp. 626-627 Type of Manuscript: Special Section LETTER (Special Section on Concurrent Systems Technology) Category: Keyword: Petri net, state machine allocatable net, free choice net,
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Dynamic Time-Slot Assignment Schemes for TDMA-Based Wireless ATM Makoto UMEUCHI Atsushi OHTA Masahiro UMEHIRA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 1997/08/20 Vol. E80-B No. 8 pp. 1182-1191 Type of Manuscript: Special Section PAPER (Special Issue on Mobile Computing) Category: Keyword: ATM, wireless access, TDMA, time-slot assignment,
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On Some Analysis Properties of Petri Net Systems under the Earliest Firing Rule Atsushi OHTA Tomiji HISAMURA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1996/11/20 Vol. E79-A No. 11 pp. 1791-1796 Type of Manuscript: Special Section PAPER (Special Section on Description Models for Concurrent Systems and Their Applications) Category: Keyword: Petri nets, the earliest furing rule, liveness, reachability,
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