研究者詳細 - 黒崎　正行

論文 - 黒崎　正行

分割表示222 件中 61 - 80 件目／全件表示 >>

Performance evaluation of OFDMA random access in IEEE802.11ax 査読有り国際誌

Uwai T., Miyamoto T., Nagao Y., Lanante L., Kurosaki M., Ochi H.

2016 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2016 2017年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 IEEE. Random access Orthogonal Frequency Division Multiple Access (OFDMA), a method for uplink multi-user transmission (UL-MU) for STAs with unknown transmit buffer has been adopted in the upcoming IEEE802.11ax next generation wireless LAN standard. In this paper, we propose a performance analysis model which use bidimensional Markov chain model of OFDMA random access. Via computer simulation, we show the usefulness of the proposed method even in the case of dense environment. In addition, we present a method in calculating the optimal number of resource units, which in 802.11ax refer to a subset of subcarriers to assign the user for OFDMA random access from numerical results.

DOI： 10.1109/ISPACS.2016.7824740

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85015004832&origin=inward

ToA-based positioning system for industrial wireless LAN 査読有り

Denney K., Hamada M., Nagao Y., Kurosaki M., Ochi H.

2016 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2016 2017年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Thailand Phulket 2016年10月24日 - 2016年10月27日

© 2016 IEEE. In this paper, we propose an alternative positioning system using time-synchronized wireless network that can achieve high positioning accuracy without being dependent to any global positioning system (GPS) devices with cm-level accuracy as the main goal and objective. The proposed system utilizes time of arrival (ToA) method in order to estimate the target's position. Based on the results, we can achieve time synchronization with less than 1ns (average offset error of 0.05ns) accuracy and cm-level (position error of 1.23cm) positioning accuracy through our simulation. Furthermore, increasing the number or measuring device in positioning system will increase the accuracy of positioning a target. High accuracy time synchronization is achievable by deploying proposed PTP with high number of iteration in synchronization period. In this research, we aim to deploy the proposed system in industrial wireless LAN. It is applicable by embedding the system into customized wireless LAN chip with positioning ability.

DOI： 10.1109/ISPACS.2016.7824744

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85015004753&origin=inward

Unified HW/SW framework for efficient system level simulation 査読有り

Sutisna N., Lanante L., Nagao Y., Kurosaki M., Ochi H.

2016 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2016 518 - 521 2017年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

South Korea Jeju 2016年10月25日 - 2016年10月28日

© 2016 IEEE. In this paper, we present unified Hardware (HW)/Software (SW) framework for efficient system level simulation of complex circuits, particularly high throughput wireless communication system. The proposed framework include a unified methodology covering both of system level simulation (e.g. MATLAB or C/C++) and physical level verification (e.g FPGA). It allows performing fast HW/SW evaluation in the context of system level performance and also covering large number of verification scenarios within acceptable time. Experimental evaluations show the example design case achieves improvement of simulation time several orders of magnitude faster than pure software simulation and also capable to run in near real-time processing. Moreover, the proposed verification platform can be used for complete performance characterization of a MIMO wireless system under various system parameters, hardware impairments and channel model.

DOI： 10.1109/APCCAS.2016.7804018

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85011031730&origin=inward

Adaptive backoff mechanism for OFDMA random access with finite service period in IEEE802.11ax 査読有り国際誌

Uwai T., Miyamoto T., Nagao Y., Lanante L., Kurosaki M., Ochi H.

2016 IEEE Conference on Standards for Communications and Networking, CSCN 2016 2016年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Germany Berlin 2016年10月31日 - 2016年11月02日

© 2016 IEEE. In next generation wireless LAN standard which is called IEEE802.11ax, Orthogonal Frequency Division Multiple Access (OFDMA) random access has been adopted as an uplink multi-user transmission technology. In this paper, we propose an adaptive backoff algorithm for OFDMA random access. Due to the finite service period defined by the standard, random access OFDMA sessions are discontinuous in time which may result in performance degradation when naive implementations are performed. Via computer simulations, we show that near maximum throughput is consistently achieved even in the case of dense environment. In addition, we explain a method for accurately estimating the number of OFDMA random access users, a key parameter in the proposed adaptive method.

DOI： 10.1109/CSCN.2016.7785174

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85010303856&origin=inward

Performance Evaluation of OFDMA Random Access in IEEE802.11ax 査読有り

Tatsumi Uwai, Takuma Miyamoto, Yuhei Nagao, Leonardo Lanante Jr., Masayuki Kurosaki, Hiroshi Ochi

Proc. IEEE International Symposium on Intelligent Signal Processing and Communication Systems 2016年10月

Design of WLAN based system for fast protocol factory automation system 査読有り

Maria K., Lam D., Lanante L., Nagao Y., Kurosaki M., Ochi H., Areni I.

Proceedings - Asia-Pacific Conference on Communications, APCC 2016 430 - 435 2016年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Indonesia Yogyakarta 2016年08月25日 - 2016年08月27日

© 2016 IEEE. This paper proposes a design of wireless communication system, particularly physical layer system (PHY) for Factory Automation (FA) system based on Wireless Local Area Network (WLAN) communication system. The designed PHY system is developed based on a fast and deterministic communication featuring a synchronous multi user round robin transmission protocol. Low overhead Packet Division Multiple Access (PDMA) scheme is utilized for Multi-user Downlink transmission, while the Frequency Division Multiple Access (FDMA) is employed for the uplink transmission. For efficient PHY implementation, several approaches on architectural aspects are also introduced. Implementation results show that the optimized design of transmitter and receiver have efficient logic resource while maintain required processing speed and error performance.

DOI： 10.1109/APCC.2016.7581430

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84994655892&origin=inward

Overview of Next Generation Wireless LAN IEEE 802.11ax 査読有り

Yuhei Nagao, Leonardo Lanante, Tatsumi Uwai, Masayuki Kurosaki, Hiroshi Ochi

Proc. International Workshop on Smart Info-Media Systems in Asia 248 - 253 2016年09月

MU-MIMO channel emulator with automatic channel sounding feedback for IEEE 802.11ac 査読有り

Nguyen T., Lanante L., Nagao Y., Kurosaki M., Ochi H.

IEEE Wireless Communications and Networking Conference, WCNC 2016-September 2016年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Qatar Doha 2016年04月03日 - 2016年04月06日

© 2016 IEEE. This paper proposes a 4×4 MU-MIMO channel emulator with automatic channel sounding feedback used for beam-forming and MU-MIMO precoding features of IEEE 802.11ac. The main contribution of this paper is the design of a MU-MIMO channel emulator capable of sending channel feedback automatically to the AP from the generated channel coefficients after a programmable time duration. This function helps to evaluate the precoding algorithms without channel estimation error and uses very minimal MAC features. The second contribution is the design of single path implementation with serial processing which plays an important role on reducing the hardware complexity. The design choice makes it possible to generate channel coefficients for very high sampling rate systems with little increase in complexity. In addition, single path implementation allows the addition of the feedback channel output with only few additional nonsequential elements which would otherwise double in a parallel implementation. To demonstrate the functionality of our MU-MIMO channel emulator, we present actual hardware emulator results of precoded receive signal constellation on oscilloscope.

DOI： 10.1109/WCNC.2016.7564942

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84989854391&origin=inward

Fast design exploration with unified HW/SW co-verification framework for high throughput wireless communication system 査読有り国際誌

Sutisna N., Hongyo R., Lanante L., Nagao Y., Kurosaki M., Ochi H.

IEEE Joint Conference - International Conference on IC Design and Technology, ICICDT 2016 and Solid State Systems Symposium, 4S 2016 2016年08月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 IEEE. This paper presents fast design exploration with unified HW/SW co-verification framework, particularly for high throughput wireless communication system. Design exploration is an important task during design development in order to obtain optimum design with various possible methods/algorithms of implementation and also under various design constraints. The fast design exploration is enabled by employing co-operation between model-based RTL design and proposed unified HW/SW co-verification platform. Fast design exploration and unified HW/SW co-verification of MIMO MLD Decoder is selected as design example to show the effectiveness employed methodology and proposed platform. This approach gives significant improvement on reducing hardware design and verification time as compared with conventional approach, as well as provides reliable design.

DOI： 10.1109/ICICDT.2016.7542059

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84988354356&origin=inward

Unified HW/SW co-verification methodology for high throughput wireless communication system 査読有り

Sutisna N., Hongyo R., Lanante L., Nagao Y., Kurosaki M., Ochi H.

IPSJ Transactions on System LSI Design Methodology ( 一般社団法人情報処理学会 ) 9 ( 0 ) 61 - 71 2016年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Information Processing Society of Japan. As complexity of system LSI design is increased significantly, efficient verification methodology is mandatory to achieve reliable system and to speed up development time. HW/SW co-verification, nowadays, is interesting and practical as a tool for system verification because it allows covering large number of verification scenarios in acceptable time. In this paper, we present an efficient and unified framework of HW/SW co-verification methodology for large scale system, particularly high throughput wireless communication system. The proposed methodology combine system level simulation (e.g., MATLAB or C/C++) and physical level verification (e.g., FPGA). It allows performing fast HW/SW verification, as well as fast turn-around design exploration. The proposed methodology has been successfully employed to our case study which is 4x4 MIMO wireless communication system. Experimental results show that our case study is able to run in near real-time processing, resulting in an improvement of simulation time orders of magnitude faster than software based simulation. Moreover, the proposed verification platform can be used for complete characterization of communication performance of a MIMO wireless system employing MLD MIMO decoder for various operation modes and channel models.

DOI： 10.2197/ipsjtsldm.9.61

Scopus

CiNii Article

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84992616475&origin=inward

Fast Design Exploration with Unified HW/SW co-verification Framework for High Throughput Wireless Communication System 査読有り

Nana Sutisna, Reina Hongyo, Leonardo Lanante Jr., Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

IEEE International Conference on IC Design and Technology 2016年07月

FPGA Implementation of Multiprocessor SoC for Industrial Wireless LAN Systems 査読有り

Yushi Matsunaga, Mitsuru Hamada, Nico Surantha, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi,

International Technical Conference on Circuits/Systems, Computers and Communications 411 - 414 2016年07月

RTL Design of FA-WLAN System and its Verification 査読有り

Mitsuru Hamada, Duc Khai Lam, Keishi Yamaguchi, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

International Technical Conference on Circuits/Systems, Computers and Communications 245 - 248 2016年07月

A Secure and Fast Industrial WLAN System with Zero-Delay Roaming 査読有り

Keishi Yamaguchi, Mitsuru Hamada, Duc Khai Lam, Nico Surantha, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. IEEE International Conference on Industrial Technology 2016年03月

An Improved Precision Time Protocol for Industrial WLAN Communication Systems 査読有り

Duc Khai Lam, Keishi Yamaguchi, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. IEEE International Conference on Industrial Technology 2016年03月

A Fast and Safe Industrial WLAN Communication Protocol for Factory Automation Control Systems 査読有り

Duc Khai Lam, Yasuhiro Shinozaki, Keishi Yamaguchi, Satoshi Morita, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

ISCIE Transaction of the Institute of Systems, Control and Information Engineers ( 一般社団法人システム制御情報学会 ) 29 ( 1 ) 29 - 39 2016年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this work, an industrial Wireless Local Area Network (iWLAN) system used to control industrial robots (iRBs) in factory automation (FA) environments is addressed. For fast and safe communications, we first propose a synchronous multi-user round-robin transmission protocol. To reduce the overhead caused by the conventional multi-user downlink transmission technique, we then propose a low overhead Packet Division Multiple Access (PDMA) transmission technique. The numerical and simulation results indicate that our approaches increase speed of 100% and 300% throughput compared to the conventional industrial Point Coordination Function (iPCF) and Space Division Multiple Access (SDMA) approaches, respectively. Besides, our approaches also provide lower system error rate (SER) than conventional ones. In particular, the control duration per iRB in our iWLAN system is faster than 100μsec. Therefore, our proposed schemes can achieve fast and safe performance for FA communication systems.

DOI： 10.5687/iscie.29.29

CiNii Article

CiNii Research

その他リンク： http://id.ndl.go.jp/bib/027040186

Power Saving Techniques for Wireless Communication Systems Using Cross Layer Designs 査読有り

Yuya Haraguchi, Tatsuya Yamamoto, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. IEEE the 15th International Symposium on Communications and Information Technologies 2015年10月

A Fast Industrial WLAN Protocol and its MAC Implementation for Factory Communication Systems 査読有り

Duc Khai Lam, Keishi Yamaguchi, Yasuhiro Shinozaki, Satoshi Morita, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

IEEE International Conference on Emerging Technologies and Factory Automation 1 - 6 2015年09月

High-definition Video Transmission over MU-MIMO E-SDM Systemication Systems 査読有り

Koji Tashiro, Leonardo Lanante Jr., Masayuki Kurosaki, Hiroshi Ochi

2015 International Workshop on Smart Info-Media Systems in Asia 2015年08月

A Fast and Safety Industrial WLAN Protocol for Factory Communication Systems 査読有り

Duc Khai Lam, Yasuhiro Shinozaki, Keishi Yamaguchi, Satoshi Morita, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

IEEE International Conference on Industrial Technology 1808 - 1813 2015年03月

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