研究者詳細 - 黒崎　正行

論文 - 黒崎　正行

分割表示222 件中 81 - 100 件目／全件表示 >>

Proposal of a switching power supply noise mitigation technique on industrial power supply overlaid communication system, 査読有り

Hidetsugu Koga, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Journal of Signal Processing 19 ( 2 ) 43 - 53 2015年03月

A joint time synchronization concept for wireless communication system 査読有り

Setiawan H., Kurosaki M., Ochi H.

Proceedings - 2014 International Conference on Advanced Informatics: Concept, Theory and Application, ICAICTA 2014 255 - 259 2015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）

© 2014 IEEE. This paper presents a concept of common timing detection for three different wireless communication standards i.e. WLAN, WiMAX and LTE. We propose a system consists of sample rate conversion, symmetry-based auto-correlation, and peak detector. The correlation part consists of a single 256-tap symmetric-based auto-correlation circuit and a peak detector with an adaptive threshold value. The fixed point simulation results show that the proposed system has satisfied the minimum receiver sensitivity requirements that specified by the standards. Moreover, the proposed system has fitted for FPGA Virtex-5 XC5VTX240T implementation by utilizing 50 percent of total look up table (LUT) in the FPGA, and can reach the clock frequency up to 76.7MHz.

DOI： 10.1109/ICAICTA.2014.7005950

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84961309522&origin=inward

FPGA Implementation of a MIMO Channel Emulator for the IEEE802.11n/ac 査読有り

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

he 2015 Vietnam-Japan International Symposium on Antennas and Propagation 77 - 82 2015年01月

Very high throughput WLAN system for ultra HD 4K video streaming 査読有り

Syafei W., Kurosaki M., Ochi H.

2014 1st International Conference on Information Technology, Computer, and Electrical Engineering: Green Technology and Its Applications for a Better Future, ICITACEE 2014 - Proceedings 177 - 182 2015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）

© 2014 IEEE. We have been developing a very high throughput WLAN system based on IEEE802.11ac's criteria. It combines MIMO and OFDM technology to provide throughput over 1 Gbps for 150 feet propagation distance by using 80MHz of bandiwdth on 5GHz frequency band. 4 by 5 antennas MIMO is set to get 2 nd -order diversity gain to maintain high throughput and performance. Greenfield preamble with novel phase rotation is employed to mitigate the overhead problem while reducing the peak to average power ratio of the signals. Run test to broadcast the ultra high definition video which resolution 4096 × 1714 pixels/frame with 30 frame/second under in-door channel model demonstrates an excellent performance of the developed system.

DOI： 10.1109/ICITACEE.2014.7065737

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84927947333&origin=inward

ASIC design of 7.7 Gbps multi-mode LDPC decoder for IEEE 802.11ac 査読有り

Tran T., Nagao Y., Ochi H., Kurosaki M.

14th International Symposium on Communications and Information Technologies, ISCIT 2014 259 - 263 2015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）

© 2014 IEEE. In this paper, we propose a multi-mode low density parity check (LDPC) decoder architecture for high throughput wireless communication systems. Throughput of our decoder depends on code rate. The main blocks of our architecture are independent from value of the check matrix. Based on the proposed architecture, we design a twelve-mode Min-Sum LDPC decoder for IEEE 802.11ac system and synthesize it in ASIC 90nm technology. The ASIC synthesis results show that our decoder achieves up to 15.4 bits/cycle (bpc) or 7.7 Gbps at 500 MHz operating frequency, and has the best efficiency which is 1.89 (bpc/mm2) as compared to the previous works. In this paper, we also propose an efficient quantization method that can significantly improve the PER performance. The floating point and fixed point simulation results show that PER performance of the 802.11ac system is improved by at least 1 dB if using LDPC instead of BCC. Furthermore, the proposed quantization method can improve the LDPC PER performance up to 1.7 dB.

DOI： 10.1109/ISCIT.2014.7011912

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84922885090&origin=inward

産業用機器向け電力重畳型通信システムにおけるスイッチング電源雑音の軽減方式の提案査読有り

古賀英嗣, 長尾勇平, 黒崎正行, 尾知博

Journal of Signal Processing 19 ( 2 ) 43 - 53 2015年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, we present a method of reducing the effect of switching noise generated from the switching power supply using a GaN (gallium nitride) device for controlling industrial equipment communication signal. We point out the noise power with its peak at the resonance frequency determined by the parasitic impedance and circuit constants. We propose a contorted communication timing where the guard interval of the communication signal and the switching noise are overlapping. Then, we propose to select the dedicated LLR (log-likelihood ratio) calculation instantaneously when the switching noise overlaps the guard interval of the communication signal in the proposed timing. Using the proposed contorted communication timing, we have improved the SNR (signal-to-noise ratio) vs BER (bit error rate) from 1.0×10-1 to 2.5×10-2 at the SNR of 20[dB]. In addition using the proposed LLR calculation method, the SNR vs BER is improved by more than 5 [dB] while the SNR vs PER(packet error ratio) is improved by 10[dB] at the SNR of 20[dB].

DOI： 10.2299/jsp.19.43

CiNii Article

その他リンク： http://ci.nii.ac.jp/naid/130004849326

A Novel Wireless LAN Protocol for Factory Automation Control 査読有り

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

International Conference on Robotics and Biomimetics 2014年12月

Live demonstration : hardware-software co-verification for very large scale SoC using synopsys HAPS platform 査読有り

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

Proc. 2014 IEEE Asia Pacific Conference on Circuits and Systems 171 - 172 2014年11月

Lossless data hiding method using error correction code 査読有り

Tsubasa Nobeoka, Leonardo Lanante Jr., Masayuki Kurosaki, Hiroshi Ochi

Proc. 2014 IEEE Asia Pacific Conference on Circuits and Systems 539 - 542 2014年11月

LLR calculation technique for lossless data hiding method using LDPC code 査読有り

Tsubasa Nobeoka, Leonardo Lanante Jr, Masayuki Kurosaki, Hiroshi Ochi

Proc. International Workshop on Smart Info-Media Systems in Asia 2014年10月

The power saving using variable time reservation-less sleep control for wireless LAN access points 査読有り

Yuya Haraguchi, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

Proc. International Workshop on Smart Info-Media Systems in Asia 2014年10月

High-resolution image transmission over MIMO-OFDM E-SDM system with JSCC 査読有り

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

Proc. The 4th IEEE International Conference on Consumer Electronics - Berlin 379 - 383 2014年09月

High Definition Video Transmission System using Channel Characteristics

Daiki Sakata , Koji Tashiro, Masafumi Ito, Masayuki Kurosaki, Hiroshi Ochi

2014 International Symposium on Dependable Integrated Systems 2014年03月

THPマルチユーザMIMOシステムにおけるチャネル推定誤差の影響の低減手法 (通信技術の革新を担う学生論文特集) 査読有り

藤田尚吾, ラナンテレオナルドジュニア, 長尾勇平, 黒崎正行, 尾知博

電子情報通信学会論文誌. B, 通信 ( 一般社団法人電子情報通信学会 ) 97 ( 2 ) 174 - 181 2014年02月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

マルチユーザMIMO(MU-MIMO)システムにおいてTomlinson Harashima Precoding(THP)手法は良好な伝送性能を示す非線形プリコーディングとして注目されている.しかしながらチャネル情報(CSI)に誤差が存在する場合,THPのBER特性は大きく劣化する.本報告では,THPにおいて受信機側でチャネル推定値の実数のみで復号を行うことにより,CSI誤差による雑音強調の影響を低減する手法を提案する.THP手法におけるチャネル推定誤差の影響を算出し,計算機シミュレーションにより提案手法の有効性を示す.

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110009766808

PWM noise reductionin OFDM-based power supply overlaid communication system for industrial machine control 査読有り

Hidetsugu Koga, Masayuki Kurosaki, Hiroshi Ochi

AETA 2013: Recent Advances in Electrical Engineering and Related Sciences, Lecture Notes in Electrical Engineering 282 247 - 257 2013年11月

An Adaptive Frame Aggregation Algorithm for High Throughput Wireless LAN 査読有り

Yuki Chosokabe, Tatsumi Uwai, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

The International Symposium on Electrical-Electronics Engineering 2013年10月

Watermarking Method using QR Decomposition for JPEG 2000 Wireless Transmission 査読有り

Masayuki Kurosaki, Hiroshi Ochi

International Workshop on Smart Info-Media Systems in Asia 2013年10月

A Computationally Efficient Sampling Frequency Offset Estimation for OFDM based Digital Terrestrial Television System 査読有り

Nico Surantha, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

IEEE 24th International Symposium on Personal, Indoor, and Mobile Radio Communications 662 - 666 2013年09月

Channel Estimation for MISO DVB-T2 System in High-Speed Environment 査読有り

Nico Surantha, Tatsumi Uwai, Yuhei Nagao, Masayuki Kurosaki, Baiko Sai, Hiroshi Ochi

RISP Journal of Signal Processing 17 ( 5 ) 179 - 188 2013年09月

Implementation of 2.6Gbps Super-high Speed AES-CCM Security Protocol for IEEE802.11i 査読有り

Khoa Nguyen, Leoardo Lanante, Yuhei Nagao, Masayuki Kurosaki, Hiroshi Ochi

IEEE International Symposium on Communication and Information Technology 2013年09月

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