研究者詳細 - 黒崎　正行

論文 - 黒崎　正行

分割表示222 件中 41 - 60 件目／全件表示 >>

Industrial Wireless LAN System Compatible with Asynchronous Communication 査読有り

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

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

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

Tashiro K., Kurosaki M., Ochi H.

ISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems 155 - 160 2018年11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. In recent years, wireless video streaming has become very popular due to the widespread of Wi-Fi terminals supporting multiple-input multiple-output (MIMO) techniques. High-quality video streaming in wireless networks is a challenging topic. This paper proposes a greedy power allocation algorithm (GPA) for video streaming by overloaded MIMO systems. The proposed GPA adaptively controls power distribution based on received signal-to-noise ratio (SNR) so that the required bit error rate can be achieved. Simulation results demonstrate that GPA shows better performance than a conventional equal power allocation (EPA) scheme in terms of peak-signal-to-noise ratio (PSNR). The minimum SNR for achieving 35 dB in PSNR is 6 dB with GPA while EPA requires 10 dB in SNR to achieve 35 dB in PSNR.

DOI： 10.1109/ISPACS.2018.8923194

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Industrial Wireless LAN System Compatible with Asynchronous Communication 査読有り

Tsurita M., Ochi H., Sakamoto K., Toyofuku M., Itou Y., Nguyen T.T.T., Uwai T., Nagao Y., Kurosaki M., Sai B.

ISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems 168 - 172 2018年11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. In this research, we propose an industrial Wireless Local Area Network (iWLAN) system compatible with asynchronous communication for industrial robots (iRBs) control in factory automation (FA) environments. In FA, iRBs are not only controlled by synchronous communication but also by asynchronous communication. As our conventional system is not compatible with asynchronous communication, it causes delay when iRBs are controlled by asynchronous communication. In order to target iRBs using asynchronous communication, we propose the utilization of specific memory writing technique. The register transfer level (RTL) simulation results show that our proposals can communicate with iRBs in faster throughput, better than the conventional system. Furthermore, the field-programmable gate array (FPGA) implementation are carried out to confirm that motors can be controlled by our iWLAN system compatible with asynchronous communication.

DOI： 10.1109/ISPACS.2018.8923192

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Efficient MIMO video transmission scheme for the scalable video coding extension of HEVC 査読有り

Manthana Tiawongsuwan, Koji Tashiro, Leonardo Lanante, Masayuki Kurosaki, Hiroshi Ochi

2018 International Workshop on Advanced Image Technology, IWAIT 2018 1 - 3 2018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）

© 2018 IEEE. High efficiency video coding (HEVC) is the newest video coding standard of the ITU-T Video Coding Experts Group and the ISO/IEC Moving Picture Experts Group. The introduction of multiple-input multiple-output (MIMO) eigenbeam-space division multiplexing (E-SDM) systems makes it possible to increase data rate by multiplexing different data streams on multiple parallel eigen-channels. In this paper, we propose a MIMO video transmission scheme for scalable high efficiency video coding (SHVC), which is the scalable extension of H.265/HEVC. Simulation results show that our video transmission scheme has more potential to broadcast video streams efficiently than conventional MIMO systems.

DOI： 10.1109/IWAIT.2018.8369630

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Energy efficient industrial wireless system through cross layer optimization 査読有り

Kurniawati Astri Maria, Nana Sutisna, Tran Thi Thao Nguyen, Duc Khai Lam, Yuhei Nagao, Leonardo Lanante, MasayukiKurosaki, Hiroshi Ochi

Proc. IEEE International Conference on Industrial Technology (ICIT) 2018-February 1586 - 1591 2018年02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）

France Lyon 2018年02月20日 - 2018年02月22日

Industrial wireless system has been considered as a potential application in the upcoming wireless system (e.g. 5G and IoT era). The main requirements of this application are ultra-reliable low-latency and low-power massive machine type communication. Satisfying all these requirements at the same time is still big technical challenge, since many aspects from different layers of network system are inter-dependent in affecting overall system performance. Therefore, system design and optimization are difficult and could not be carried out solely in one part. To overcome these issues, this paper presents cross-layer optimization in order to achieve energy-efficient wireless system, while maintaining low-latency and high-reliability requirements. The cross-layer optimization is performed within Medium Access Layer (MAC) and Physical Layer (PHY), which are devoted as the backbone for radio access. The optimizations include system level design, low-power aware protocol and resource management design, signal processing algorithm design and circuit design techniques of transceiver system. Furthermore, the implementation of overall PHY-MAC hardware design for industrial wireless LAN system is presented. The proposed design offers an advantage, in terms of energy-efficient wireless system, as compared to the other classes of low-power wireless systems (e.g. Bluetooth, Zigbee) and the conventional WLAN systems.

DOI： 10.1109/ICIT.2018.8352418

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A hybrid HW/SW 802.11ac/ax system design platform with ASIP implementation 査読有り

Naotaka Yoshida, Leonardo Lanante, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

2017 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2017 - Proceedings 2018-January 827 - 831 2018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）

Chaina Xiamen 2017年11月06日 - 2017年11月09日

© 2017 IEEE. Current and next generation WLAN devices have an increasing need for processing power to support new WLAN features that require high computation complexity. In this paper, we present our design for an 802.11ac/ax system with an application specific instruction-set processor (ASIP) to implement multiple disjoint system tasks at much faster speed compared to a general purpose processor. As a proof of concept, we implemented the channel SVD, channel compression/decompression and beam-forming weight computations at the same time in the embedded ASIP core to support the 802.11ac MU-MIMO beamforming feature. In addition, the design was synthesized in the Zynq zc706 evaluation board programmable logic (PL) along with the rest of the PHY. The actual task to be done by the ASIP core at any given time can be programmed via the zc706 processing system (PS) resulting in a very high hardware savings compared to an all hardware implementation.

DOI： 10.1109/ISPACS.2017.8266590

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Efficient MIMO Video Transmission Scheme for the Scalable Video Coding Extension of HEVC 査読有り

Manthana Tiawongsuwan, Koji Tashiro, Leonardo Lanante, Masayuki Kurosaki, Hiroshi Ochi

Proc.International Workshop on Advance Image Technology 2018 (IWAIT2018) 2018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 Chiang Mai 2018年01月07日 - 2018年01月10日

High efficiency video coding (HEVC) is the newest video coding standard of the ITU-T video coding experts group and the ISO/IEC moving picture experts group. The introduction of multiple-input multiple-output (MIMO) eigenbeam-space division multiplexing (E-SDM) systems makes it possible to increase data rate by multiplexing different data streams on multiple parallel eigen-channels. In this paper, we propose a MIMO video transmission scheme for scalable high efficiency video coding (SHVC), which is the scalable extension of H.265/HEVC. Simulation results show that our video transmission scheme has more potential to broadcast video streams efficiently than conventional MIMO systems.

High-Accuracy Positioning System based on ToA for Industrial Wireless LAN 査読有り

Tran Thi Thao Nguyen, Khairunisa Ahmad Denney, Ohhara Syuhei, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. 2017 4th NAFOSTED Conference on Information and Computer Science 2017-January 37 - 41 2017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）

Vietnam Hanoi 2017年11月24日 - 2017年11月25日

In this paper, we propose a positioning system using a time-synchronized wireless network that can achieve high positioning accuracy without being dependent on 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 to estimate the target's position. Based on the results, we can achieve time synchronization with less than 1ns accuracy with the average offset error of 0.05ns and cm-level positioning accuracy with the position error of 1.23cm 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 a high number of iteration performed inside the 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/NAFOSTED.2017.8108035

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85043364228&origin=inward

Joint transmission and coding scheme for high-resolution video streams over multiuser MIMO-OFDM systems 査読有り

Koji Tashiro, Leonardo Lanante, Masayuki Kurosaki, Hiroshi Ochi

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences ( 一般社団法人電子情報通信学会 ) E100-A ( 11 ) 2304 - 2313 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

High-resolution image and video communication in home networks is highly expected to proliferate with the spread of Wi-Fi devices and the introduction of multiple-input multiple-output (MIMO) systems. This paper proposes a joint transmission and coding scheme for broadcasting high-resolution video streams over multiuser MIMO systems with an eigenbeam-space division multiplexing (E-SDM) technique. Scalable video coding makes it possible to produce the code stream comprised of multiple layers having unequal contribution to image quality. The proposed scheme jointly assigns the data of scalable code streams to subcarriers and spatial streams based on their signal-to-noise ratio (SNR) values in order to transmit visually important data with high reliability. Simulation results show that the proposed scheme surpasses the conventional unequal power allocation (UPA) approach in terms of both peak signal-to-noise ratio (PSNR) of received images and correct decoding probability. PSNR performance of the proposed scheme exceeds 35dB with the probability of over 95% when received SNR is higher than 6dB. The improvement in average PSNR by the proposed scheme compared to the conventional UPA comes up to approx. 20dB at received SNR of 6dB. Furthermore, correct decoding probability reaches 95% when received SNR is greater than 4dB.

DOI： 10.1587/transfun.E100.A.2304

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85033501808&origin=inward

Channel Selectivity Schemes for Re-transmission Diversity in Industrial Wireless System 査読有り

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

Proc. International Symposium on Electronics and Smart Devices (ISESD) 2018-January 207 - 212 2017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）

Indonseia Yogyakarta 2017年10月17日 - 2017年10月19日

The new use case of 5G network, such as industrial wireless control system and Machine-to-Machine (M2M) communication system, requires high reliability and real-time communication (ultra low-latency) at the same time. To increase system reliability, re-transmission scheme is one of popular technique, but it introduces a significant communication latency. To address this latency introduced by conventional re-transmission scheme, this paper presents re-transmission diversity through channel selectivity. Adjacent channel selection and random channel selection are the two channel selectivity schemes that are being considered as fast and low-latency channel selection method. The performance comparison of these two schemes are evaluated in an industrial wireless system. Evaluation results show that channel selectivity based on adjacent channel selection gives a better performance as compared with random channel selection. Furthermore, the impact of channel selectivity in different channel models are also presented to evaluate its effectiveness and to provide an insight for final deployment.

DOI： 10.1109/ISESD.2017.8253333

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Unified HW/SW System-Level Simulation Framework for Next Generation Wireless System 査読有り

Nana Sutisna, Leeonardo Lanante Jr., Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. 2017 30th IEEE International System-on-Chip Conference (SOCC) 2017-September 322 - 327 2017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）

Germay Munich 2017年09月05日 - 2017年09月08日

Recently, wireless technology experiences a fast growth to meet user demand and push toward the boundary limit of system performance. The simulation and verification framework play important role for accelerating investigation of technology proof of concept, field-trial, and large-scale commercial prototyping. In this paper, we present system-level simulation of heterogeneous model and unified HW/SW framework, particularly for next generation wireless system. The proposed framework includes a unified HW/SW co-evaluation methodology, the flexible HW/SW architecture, and fast HW/SW co-evaluation. The co-evaluation is carried out by employing hardware-in-the loop scheme that covers various abstraction level of simulation, from algorithm-level into physical-level simulation, with respect to system level simulation. The proposed co-verification framework allows a comprehensive system evaluation for a wireless system, involving various system parameters, hardware impairments, different channel conditions and cross-layer evaluations with fast run-time evaluations. Additionally, we also show an application example of multi-user wireless communication system and its experimental evaluations.

DOI： 10.1109/SOCC.2017.8226070

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044311350&origin=inward

Precoding and postcosing schemes for wireless video transmission in overloded MIMO systems 査読有り

Koji Tashiro, Leonardo Lanante, Masayuki Kurosaki, Hiroshi Ochi

Proc. IEEE International Conference on Image Processing (ICIP 2017) 2017-September 1920 - 1924 2017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）

China Beijing 2017年09月17日 - 2017年09月20日

Image and video transmission is highly expected to proliferate with the wide spread of Wi-Fi devices and the introduction of multiple-input multiple-output (MIMO) systems. This paper proposes a novel precoder for video transmission in overloaded MIMO systems, which is based on an eigenbeam space division multiplexing (E-SDM) technique. This paper also proposes a low complexity postcoder, which detects some of data symbols by a linear approach and the others by a prevoting vector cancellation (PVC) approach. It is shown from simulation results that the proposed precoder and postcoder achieve 40 dB in peak signal-to-noise ratio while reducing the computational complexity by over 61 compared to the conventional PVC-based detection when received signal-to-noise ratio is higher than 10 dB.

DOI： 10.1109/ICIP.2017.8296616

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85045302591&origin=inward

Analysis of Finite Retry Limit on Uplink OFDMA Random Access 査読有り

Tomoyasu Irikida, Tatsumi Uwai, Leonardo Lanante Jr., Masayuki Kurosaki, Hiroshi Ochi

Proc. 2017 International Workshop on Smart Info-Media Systems in Asia (SISA 2017) 2017年09月

Scalable Copyright Protection using Lossless Information Hiding 査読有り

Koichi Araki, Tsubasa Sonezaki, Masayuki Kurosaki, Hiroshi Ochi

Proc. 2017 International Workshop on Smart Info-Media Systems in Asia (SISA 2017) 2017年09月

OFDMAランダムアクセスのマルコフ連鎖モデル化とその性能解析査読有り

上井竜己, 長尾勇平, ラナンテジュニア, 黒崎正行, 尾知博

電子情報通信学会論文誌B 通信 ( 電子情報通信学会 ) J100-B ( 7 ) 492 - 504 2017年07月

記述言語：日本語掲載種別：研究論文（学術雑誌）

次世代無線LAN規格IEEE 802.11axにおいて採用が決定しているUplink-Multi User送信では，Orthogonal Frequency Division Multiple Access (OFDMA)ランダムアクセスが検討されている．本論文ではOFDMAランダムアクセスのマルコフ連鎖モデルを提案し，提案モデルがIEEE 802.11規格におけるDistributed Coordination Functionの性能解析モデルとして基本的なモデルであるBianchiモデルの拡張モデルとみなせることを示す．提案モデルを用いてOFDMAランダムアクセスの通信効率とスループットを解析し，解析結果と計算機シミュレーション結果の比較を通して，稠密環境におけるOFDMAランダムアクセスの性能を高精度に解析可能であることを示す．更に，OFDMAランダムアクセスの通信効率をMedium Access Control (MAC)パラメータに着目して解析し，環境に応じてMACパラメータを設定することで，通信効率が向上することを示す．

DOI： 10.14923/transcomj.2016wfp0005

Interleaved Domain Interference Canceller for Low Latency IDMA System and Its VLSI Implementation 査読有り

Tran Thi Thao Nguyen, Leonardo Lanante, Yuhei Nagao, Masayuki Kurosaki, Shingo Yoshizawa, Hiroshi Ochi

Proc. 2017 IEEE 85th Vehicular Technology Conference (VTC Spring) 2017-June 2017年06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）

Australia Sydney 2017年06月04日 - 2017年06月07日

Interleave division multiple access (IDMA) is a potential candidate for the future fifth generation (5G) systems. In this paper, we propose a novel architecture for IDMA system with low latency while maintaining low complexity. In the conventional architecture, the IDMA receiver sequentially processes deinterleaving, despreading, spreading and interleaving for multiuser detection. The proposed architecture, which is called the interleaved domain, can perform multi-user detection directly without deinterleaving the received frame. Because of this, the interleaving is no longer needed in the interference cancellation loop resulting in the decrease of latency by half and the increase of throughput by twice. In VLSI implementation results, the proposed architecture has reduced circuit area and power consumption by 53% and 58% compared to the conventional architecture on the same throughput condition.

DOI： 10.1109/VTCSpring.2017.8108683

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85040561302&origin=inward

Performance analysis of the 802.11ax UL OFDMA random access protocol in dense networks 査読有り

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

Proc. 2017 IEEE International Conference on Communications (ICC) 1 - 6 2017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）

France Paris 2017年05月21日 - 2017年05月25日

Recently, 802.11ax has introduced uplink Orthogonal Frequency Division Multiple Access (UL OFDMA)-based random access transmission to provide uplink multiuser capability to stations (STA) with unknown buffer status. These STAs include those that are waking up from sleep and unassociated STAs trying to establish connection for the first time. Due to the absence of carrier sensing per resource unit, this procedure has a maximum efficiency of only about 37% for high number of STAs. The efficiency will decrease further without properly choosing the random access parameters. In this paper, we first build an analytical model of the performance of UL OFDMA random access transmission and verify it using simulations. In addition, we propose methods to optimize various random access parameters to maintain a system efficiency near the 37% limit. Simulation results show that our optimization methods can increase the throughput of UL OFDMA random access by as much as 39% when compared to randomly chosen parameters.

DOI： 10.1109/ICC.2017.7997340

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85028300693&origin=inward

Re-transmission diversity with fast channel selectivity for reliable industrial WLAN system 査読有り

Maria K., Nagao Y., Lanante L., Kurosaki M., Ochi H.

Proceedings of the IEEE International Conference on Industrial Technology 1189 - 1194 2017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）

Canada Toronto 2017年03月22日 - 2017年03月25日

© 2017 IEEE. This paper proposes a fast and low-complexity retransmission scheme for Industrial WLAN system. The proposed scheme exploits the frequency diversity and employs channel selectivity in order to achieve high-reliability and low-latency communication. The channel selectivity is carried out instantly by re-scheduling sub-carrier allocation during OFDM transmission in order to obtain diversity gain. Evaluation results show that the performance of the proposed scheme in terms of system-error rate and achievable transmission throughput rate, are significantly improved from the conventional re-transmission scheme. Furthermore, the proposed method only need a minor modification in both of communication protocol and transceiver design from the existing Industrial WLAN system. Hence, the low-complexity transmission scheme could be realized in current OFDM-based wireless system.

DOI： 10.1109/ICIT.2017.7915531

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85019556645&origin=inward

Low latency Interleave Division Multiple Access System 査読有り国際誌

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

International Conference on Information Networking 7 - 12 2017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）

Vietnam Da Nang 2017年01月11日 - 2017年01月13日

© 2017 IEEE. In this paper, we propose a novel architecture for IDMA system with low latency and high throughput for the uplink multi-user wireless system. The throughput of the proposed IDMA system can be improved to about double compared to the conventional IDMA system while the hardware complexity remains unchanged. To achieve this, the proposed system utilizes the interleaver/de-interleaver-less architecture to minimize the latency of the interference canceller in IDMA receiver. In the conventional architecture, the IDMA receiver sequentially processes the de-interleaving, interleaving, de-spreading and spreading that cause high latency. The proposed architecture can perform these sequential processes at the same time resulting in a reduction of interference cancellation operation cycles in half.

DOI： 10.1109/ICOIN.2017.7899444

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85018302531&origin=inward

An area-efficient multimode FFT circuit for IEEE 802.11 ax WLAN devices 査読有り国際誌

Dinh P., Lanante L., Nguyen M., Kurosaki M., Ochi H.

International Conference on Advanced Communication Technology, ICACT 735 - 739 2017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）

Korea Pyongchang 2017年02月19日 - 2017年02月22日

© 2017 Global IT Research Institute - GiRI. Multi-mode fast Fourier Transform (FFT) circuits are essential in orthogonal frequency domain (OFDM) based systems which supports multiple bandwidth. Typically, hardware implementation employs a single FFT circuit for the highest supported bandwidth and using oversampling, the same FFT circuit is used to support lower bandwidth. For the new 802.11ax wireless local area network (WLAN) standard whose frame consists of the regular 3.2us length symbol as well as a longer 12.8us symbol, a fast switchable double-mode FFT circuit is required. In addition, the 802.11ax SIG-B symbol contains a maximum of two independent symbol streams that requires two FFT circuits for the 3.2us symbol length. Our proposed FFT architecture is optimized to support the 802.11ax standard with low latency, area and power requirements. FPGA implementation results show that our proposed circuit has efficiency 13.7% lower area compared to conventional architecture.

DOI： 10.23919/ICACT.2017.7890190

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85018460543&origin=inward

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