研究者詳細 - 黒崎　正行

論文 - 黒崎　正行

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Software Defined Radio Development of Accurate Time Synchronization for Industrial WLAN Systems 査読有り

Nguyen T.T.T., Toyofuku M., Ito Y., Ishimitsu C., Nagao Y., Kurosaki M., Khai L.D., Ochi H.

IECON Proceedings (Industrial Electronics Conference) 2020-October 2134 - 2139 2020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）

© 2020 IEEE. In this paper, we propose a hardware development of a high accuracy Precision Time Protocol (PTP) on Software Defined Radio (SDR) for Industrial WLAN systems. To increase the throughput of the transmission system, we propose a low overhead 3-frames exchange PTP instead of 4-frames transmission as IEEE 1588 PTP protocol. Besides, our hardware-software co-design of the full SoC MAC-PHY can select the PTP timestamp point to remove the random transmission jitters caused by higher layers and the imbalanced timing made by the rugged hardware designs between master and slave. In previous work, the PTP synchronization has been evaluated on the M820-ZYNQ platform with Dummy PHY. In this paper, the proposed PTP system is developed on the SDR platform with real PHY. The SDR platform can reduce the processing delay between software and hardware compared to the previous platform. The result of our demonstration experiments shows that an oscilloscope captures the time synchronization of the proposed system in high accuracy with the nano-second level, which is less than 200 ns.

DOI： 10.1109/IECON43393.2020.9254681

Scopus

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Performance analysis model of IEEE 802.11 CSMA/CA for Multi-BSS environment 査読有り

Kajihara R., Wenkai H., Lanante L., Kurosaki M., Ochi H.

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020-August 2020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）

© 2020 IEEE. The Markov chain based model by Bianchi for IEEE802.11 distributed controlled access is a highly accurate analytical tool for estimating the system throughput when a single Basic Service Set (BSS) network operates in isolation. However, with the increase of wireless LAN access points being deployed on the same area, an environment with multiple BSS interfering with each other has become the default network scenario. The purpose of this work is to extend the single BSS Markov chain model into a multi-BSS model by incorporating the influence of STAs' interference range and carrier sense range to their own transmission and collision probabilities. We verify the proposed multi-BSS analytical model using the latest version of the ns3 simulator which has recently supported accurate PHY abstractions for multi-BSS simulation. We show that the proposed model has a high accuracy (within 1%) independent of the multi-BSS network topology.

DOI： 10.1109/PIMRC48278.2020.9217235

Scopus

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Retransmission Diversity with Channel Selectivity for High Reliable and Low Latency Industrial Wireless Control System 査読有り

Kurniawati Astri Maria, Sutisna Nana, Lanante Jr. Leonardo, Nagao Yuhei, Kurosaki Masayuki, Ochi Hiroshi

信号処理 ( 信号処理学会 ) 24 ( 3 ) 81 - 90 2020年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

<p>The emerging applications in the 5th generation (5G) network, such as industrial control system and Machine-to-Machine (M2M) communication require high reliability and low latency communication at the same time. The retransmission scheme is one of the practical approaches to increase system reliability when other diversity techniques are avoided due to hardware complexity or significant transmission delay. In order to address such problems, in this paper, we propose a fast yet reliable retransmission scheme. The proposed retransmission scheme leverages the frequency diversity through simple channel selectivity. The channel selectivity is carried out by employing low complexity subcarrier allocation for selecting other channels in Orthogonal Frequency Division Multiplexing (OFDM) transmission. The evaluation results show that the proposed retransmission method outperforms the conventional scheme. The proposed method can reduce the number of retransmission by up to 30%, corresponding to a success rate of 0.9999 . In addition, it can be employed in an industrial Wireless Local Area Network (iWLAN) system with a large number of users. The achievable control duration is around 52-63 μs, an improvement of approximately 36% compared to the conventional system.</p>

DOI： 10.2299/jsp.24.81

CiNii Article

CiNii Research

その他リンク： https://ci.nii.ac.jp/naid/130007843050

Hardware Design of Transmitter and Receiver for High Quality Video Transmission 査読有り

Kubo K., Yoshikawa Y., Tashiro K., Lanante L., Kurosaki M., Ochi H.

2020 8th International Electrical Engineering Congress, iEECON 2020 2020年03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）

© 2020 IEEE. The demand for high-resolution wireless video transmission technology is expected to increase greatly as the video resolution increases, and as the Wi-Fi devices spread. Wireless transmission of high-resolution video requires high throughput, therefore it is necessary to use a multiple-input multiple-output (MIMO) system. In this paper, we propose an evaluation platform for video transmission method based on joint source-channel coding (JSCC) that suppresses the degradation of received video by combining source coding and precoding, and efficient hardware software co-design for implementing it on hardware such as field-programmable gate array (FPGA) board. As a result of simulation, beamforming based on eigenbeam-space division multiplexing (E-SDM), one of the precoding method, is performed and the effectiveness of the proposed method has been confirmed.

DOI： 10.1109/iEECON48109.2020.229514

Scopus

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Multi-Stage MLD with Interference Cancellation in Superposition MIMO Systems for Video Streaming 査読有り

Tashiro K., Kurosaki M., Ochi H.

2020 8th International Electrical Engineering Congress, iEECON 2020 2020年03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）

© 2020 IEEE. Wireless video transmission through multiple-input multiple-output (MIMO) channels has become more and more popular recently. In the superposition MIMO system which non-orthogonally multiplexes several signals in the power domain, the receiver performs non-linear detection to estimate the transmitted signals, which is called postcoding. This paper proposes a multistage postcoder which combines maximum likelihood detection (MLD) with codeword-level interference cancellation (CWIC) to balance the accuracy and complexity. It is shown from simulations that the proposed postcoder outperforms the conventional minimum mean square error-based detection with CWIC, where its improvement in peak signal-to-noise ratio comes up to 11 dB.

DOI： 10.1109/iEECON48109.2020.229510

Scopus

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Precoder and postcoder design for wireless video streaming with overloaded multiuser MIMO-OFDM systems 査読有り

Tashiro K., Kurosaki M., Ochi H.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences ( 一般社団法人電子情報通信学会 ) E102A ( 12 ) 1825 - 1833 2019年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2019 The Institute of Electronics, Information and Communication Engineers Mobile video traffic is expected to increase explosively because of the proliferating number of Wi-Fi terminals. An overloaded multiple-input multiple-output (MIMO) technique allows the receiver to implement smaller number of antennas than the transmitter in exchange for degradation in video quality and a large amount of computational complexity for postcoding at the receiver side. This paper proposes a novel linear precoder for high-quality video streaming in overloaded multiuser MIMO systems, which protects visually significant portions of a video stream. A low complexity postcoder is also proposed, which detects some of data symbols by linear detection and the others by a prevoting vector cancellation (PVC) approach. It is shown from simulation results that the combination use of the proposed precoder and postcoder achieves higher-quality video streaming to multiple users in a wider range of signal-to-noise ratio (SNR) than a conventional unequal error protection scheme. The proposed precoder attains 40 dB in peak signal-to-noise ratio even in poor channel conditions such as the SNR of 12 dB. In addition, due to the stepwise acquisition of data symbols by means of linear detection and PVC, the proposed postcoder reduces the number of complex additions by 76% and that of multiplications by 64% compared to the conventional PVC.

DOI： 10.1587/transfun.E102.A.1825

Scopus

CiNii Article

CiNii Research

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Wireless Video Transmission over Multiuser MIMO Systems with Fair Power Allocation 査読有り国際誌

Yoshikawa Y., Tashiro K., Kurosaki M., Ochi H.

Proceedings - 2019 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2019 2019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）

Taiwan Taipei 2019年12月03日 - 2019年12月06日

© 2019 IEEE. With the spread of mobile devices, image and video transmission is in great demand. The use of multiuser multiple-input multiple-output (MU-MIMO) systems, where multiple data can be sent to multiple users, is highly expected. This paper proposes a novel power allocation scheme for MU-MIMO systems, which minimizes the variance of channel capacities of each spatial stream of all users to achieve user fairness in terms of video quality. In addition to the user fairness, we make the spatial streams which convey visually more important information be high-quality for achieving high video quality. Simulation results show that the proposed power allocation enables to equalize video quality even if the distances between a transmitter and users are different.

DOI： 10.1109/ISPACS48206.2019.8986256

Scopus

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Power Allocation for Wireless Video Streaming over MIMO Systems with Superposition Coding 査読有り

Tashiro K., Kurosaki M., Ochi H.

International Symposium on Wireless Personal Multimedia Communications, WPMC 2019-November 2019年11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）

Portugal Lisbon 2019年11月24日 - 2019年11月27日

© 2019 IEEE. Recently, video distribution over wireless networks has become more common due to the spread of smart devices. This paper proposes an optimal power allocation algorithm for the transmission of layered video streams over point-to-point multiple-input multiple-output (MIMO) systems combined with superposition coding. The proposed power allocation scheme is derived from the maximization of the weighted sum-rate, where two-step optimization leads to a closed-form solution. First, the power distribution between eigen-channels is optimized, and then the optimal power allocation to quality layers is obtained. Results demonstrate that the proposed scheme attains higher peak signalto-noise ratio on average in a wide range of signal-to-noise ratio than conventional fixed power allocation schemes.

DOI： 10.1109/WPMC48795.2019.9096159

Scopus

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Development of Factory Automation WLAN System Compatible with Asynchronous Industrial Ethernet 査読有り

Nguyen T., Tsurita M., Toyofuku M., Ito Y., Nagao Y., Kurosaki M., Ochi H.

IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2019-September 1338 - 1341 2019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）

Spain Zaragoza 2019年09月10日 - 2019年09月13日

© 2019 IEEE. In this paper, we propose a design of asynchronous communication for an industrial wireless LAN system. In our design, MAC is synchronous multi-user round-robin transmission protocol. Low overhead Packet Division Multiple Access scheme is utilized for Multi-user Downlink transmission up to 80 MHz, while Frequency Division Multiple Access is employed for the uplink transmission. The designed of PHY system is developed based on a fast and deterministic communication featuring the synchronous multi-user system. In this paper, the industrial robots are not only controlled by synchronous communication but also by asynchronous communication via our industrial WLAN (iWLAN) system. This paper presents the hardware and software cooperative design. In the verification, up to 10 motors can be controlled by our iWLAN system by asynchronous communication, and the delay of each robot measured is 188 μs on average. Besides, the time synchronization captured by oscilloscope is from 40 to 100 ns as in our target.

DOI： 10.1109/ETFA.2019.8868973

Scopus

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Verification of Symbol Timing Synchronization for Wi-Fi System 査読有り国際誌

Kusunoki I., Nagano K., Sutisna N., Nagao Y., Lanante L., Kurosaki M., Ochi H.

Proceedings - 2019 19th International Symposium on Communications and Information Technologies, ISCIT 2019 167 - 172 2019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）

Vietnam Ho Chi Minh City 2019年09月25日 - 2019年09月27日

© 2019 IEEE. In this paper, we propose a system that verifies and corrects the accuracy of symbol timing synchronization processing to determine reception time in Wi-Fi system. Time-of-flight (ToF) based Wi-Fi indoor mobile position estimation uses transmission and reception time stamp of radio waves between the mobile terminal targeted for estimation and fixed Wi-Fi receivers. However, it is known that the accuracy of radio reception time stamp in existing Wi-Fi receivers may be deteriorated due to the influence of multipath environment. Therefore, this paper proposes a system that corrects the accuracy of symbol timing synchronization processing that determines the reception time of radio wave in Wi-Fi system. This will improve the estimation accuracy of Wi-Fi indoor mobile position estimation.

DOI： 10.1109/ISCIT.2019.8905193

Scopus

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Low-complexity and high-accuracy positioning protocol based on an asynchronous protocol 査読有り

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

IEEE Vehicular Technology Conference 2019-September 2019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）

USA Honolulu, Hawaii 2019年09月22日 - 2019年09月25日

© 2019 IEEE. Currently, Global Positioning System (GPS) is widely used as a representative position estimation system. However, GPS suffers from poor position estimation accuracy in an indoor environment. Moreover, time synchronization between devices needs to be performed for position estimation which is a resource intensive process. In previous studies, an asynchronous protocol (i.e., no synchronization requirement) called Grid Search was proposed to handle this problem. However, this method also has high complexity and takes a lot of search time to estimate the position. In this paper, we propose a method to narrow the search range using intersecting chord under the condition that generated circles intersect with each other. The proposed position estimation method has low complexity but can achieve accuracy comparable to Grid Search, i.e., a maximum estimation error less than 2 meters with 80% of the trials are within 1 meter. In addition, the calculation time can be reduced up to 6 times compared to the Grid Search when the search range extends to 5 times.

DOI： 10.1109/VTCFall.2019.8891468

Scopus

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Live demonstration: Accurate time synchronization for industrial wireless LAN systems 査読有り

Tran Thi Thao Nguyen, Yuhei Nagao, Nico Surantha, Masayuki Kurosaki, Hiroshi Ochi

Proceedings - IEEE International Symposium on Circuits and Systems 2019-May 2019年05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）

Japan Sapporo 2019年05月26日 - 2019年05月29日

© 2019 IEEE We demonstrate a precision time protocol (PTP) used to synchronize clocks in industrial wireless local area network (iWLAN) communication systems. The implementation of the system on FPGA boards for accurate verification and to test the feasibility of the system in a real environment. The result has been confirmed that time synchronization is high accuracy from 40 to 100 ns.

DOI： 10.1109/ISCAS.2019.8702192

Kyutacar

Scopus

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High Precision Industrial Wireless LAN System with Asynchronous Communication 査読有り

Tran Thi Thao Nguyen, Makoto Tsurita, Kyoshiro Sakamoto, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

International Conference on Advanced Communication Technology, ICACT 2019-February 222 - 227 2019年04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）

Korea Pyeongchang 2019年02月17日 - 2019年02月20日

© 2019 Global IT Research Institute (GIRI). In this paper, we propose an industrial Wireless Local Area Network (iWLAN) system compatible with asynchronous communication for industrial robots (iRBs) control in factory automation (FA) environments. The design of our media access control layer is synchronous multi-user round-robin transmission protocol. Low overhead Packet Division Multiple Access (PDMA) scheme is utilized for Multi-user Downlink transmission up to 80 MHz, while Frequency Division Multiple Access (FDMA) is employed for the uplink transmission. The system is developed based on a fast and deterministic communication featuring the synchronous multi-user system. In general, the iRBs are not only controlled by synchronous communication but also by asynchronous communication via this iWLAN system. In this paper, we present the Field-programmable gate array (FPGA) implementation are carried out to confirm that our iWLAN system by asynchronous communication can control up to four motors. Based on the result of FPGA implementation, the time synchronization of the proposed system in high accuracy from 40 to 100 ns is also captured by an oscilloscope.

DOI： 10.23919/ICACT.2019.8701902

Scopus

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Asynchronous Indoor Positioning System and Its FPGA Implementation 査読有り

Kotaro Nagano, Yuhei Nagao, Leonardo Lanante Jr, Masayuki Kurosaki, Hiroshi Ochi

Proceedings of 7th Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS'19) 2019年01月

Industrial Wireless LAN System Compatible with EtherCAT 査読有り

Kyoshiro Sakamoto, Makoto Tsurita, Yuhei Nagao, Mizuki Toyofuku, Yoshiki Itou, Tran Thi Thao Nguyen, Tatsumi Uwai, Masayuki Kurosaki, Hiroshi Ochi

Proceedings of 7th Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS'19) 2019年01月

Performance Evaluation of MU-MIMO Channel Emulator 査読有り

Kyosuke Kubo, Tran Thi Thao Nguyen, Leonardo Lanante Jr, Masayuki Kurosaki, Hiroshi Ochi

Proceedings of 7th Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS'19) 2019年01月

High Precision Localization by Shrinking Circle based on An Asynchronous Protocol 査読有り

Nan Wang, Leonardo Lanante Jr, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proceedings of 7th Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS'19) 2019年01月

FPGA Implementation of Wireless LAN System for Factory Automation 査読有り

Tran Thi Thao Nguyen, Yuhei Nagao, Tatsumi Uwai, Nana Sutisna, Masayuki Kurosaki, Hiroshi Ochi, Baiko Sai

International Conference on Advanced Technologies for Communications 2018-October 78 - 83 2018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）

Vietnam Ho Chi MInh City 2018年10月18日 - 2018年10月20日

© 2018 IEEE. A design of wireless communication system, particularly Media Access Control (MAC) and Physical layer system (PHY) for Factory Automation (FA) system based on Wireless Local Area Network (WLAN) communication system, is proposed in this paper. The designed of MAC is synchronous multi-user round-robin transmission protocol. Low overhead Packet Division Multiple Access (PDMA) scheme is utilized for Multi-user Downlink transmission up to 80 MHz, while Frequency Division Multiple Access (FDMA) is employed for the uplink transmission. The designed of PHY system is developed based on a fast and deterministic communication featuring the synchronous multi-user system. For efficient of multi-user transmission in the proposed protocol, the transmission time of the proposed iWLAN with 40 MHz bandwidth can achieve 500% better than PROFINET wireless standard. Furthermore, the implementation results of MAC and PHY layer of the proposed system show that FPGA logic utilization can fit with the target FPGA which is promising for a full implementation and evaluation combining with radio frequency.

DOI： 10.1109/ATC.2018.8587479

Scopus

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Optimized Packetization of H.264 SVC Bitstreams for MIMO Wireless Video Streaming 査読有り

Tiawongsuwan M., Tashiro K., Kurosaki M., Ochi H.

ISCIT 2018 - 18th International Symposium on Communication and Information Technology 355 - 358 2018年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Wireless video transmission over multiple-input multiple-output (MIMO) systems is a challenging theme. Eigen beam-space division multiplexing (E-SDM) is an optimal beamforming technique in terms of channel capacity when the transmitter and receiver can share channel state information. E-SDM sorts the channel quality from the highest signal-To-noise ratio (SNR) to the lowest one. This paper presents the video transmission scheme for H.264 scalable video streams over MIMO E-SDM with optimized packetization. The proposed method controls the ratio of a base layer and enhancement layers contained in a packet. The result shows that the optimized ratio is obtained when a packet consists of the lowest base layer ratio. This ratio provides the 39.9 dB of peak-signal-To-noise ratio after decoding while no frame can be decoded with the other ratio at SNR of 10 dB.

DOI： 10.1109/ISCIT.2018.8587974

Scopus

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Greedy Power Allocation for Wireless Video Streaming with Overloaded MIMO Systems 査読有り

Koji Tashiro, Masayuki Kurosaki, Hiroshi Ochi

Proc. 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS) 2018年11月

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