Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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Measurement of Narrowband Channel Characteristics in Single-Phase Three-Wire Indoor Power-Line Channels Reviewed

Y. Sugiura, T. Yamazato, M. Katayama

IEEE International Symposium on Power Line Communications and Its Applications page： - 2008.4

Language：English

This manuscript reports the measurement results of narrowband signal propagation of PLC channels. In Japan, in-house wiring is single-phase three-wire, and each branch between an outlet of 100V and the panel board is connected to one of two live conductors and the neutral. Thus a pair of outlets can be classified into three types: connected to different live conductors, connected to the same live conductors by different branches from the panel board, and on the same branch to the same live conductor. It is confirmed that the results of the measurements can be classified by these three types of paths. The results show that frequency responses of narrowband PLC channels are relatively smooth, compared with that of wideband PLC. It is also found that propagation loss in lower frequency range is larger than in higher frequency range. The time independence of narrowband PLC channels are confirmed when no electric appliance is connected to the same live conductor.

A-17-12 CDMA Slotted ALOHA Systems with Successive Interference Cancellation for Inter-Vehicle Communications(A-17. ITS) Reviewed

Sakata Atsunori, Yamazato Takaya, Okada Hiraku, Katayama Masaaki

Proceedings of the IEICE General Conference Vol. 2008 page： 323 2008.3

A-5-18 Adaptive modulation for power-line communications with nonwhite and cyclostationary noise Reviewed

Sawada Naoya, Yamazato Takaya, Katayama Masaaki

Proceedings of the IEICE General Conference Vol. 2008 page： 145 2008.3

A-2-35 Noncoherent Communication Systems using Chaotic Sequence with Many Biased Values Reviewed

ARAI Shintaro, NISHIO Yoshifumi, YAMAZATO Takaya

Proceedings of the IEICE General Conference Vol. 2008 page： 74 2008.3

Introduction of Fractional Frequency Reuse and Fast Retrial Algorithm for uplink of Multi-Cell OFDMA s-ALOHA systems

K. Kimura T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Iterative joint decoding of multiple correlated sources using Turbo codes

K. Kobayashi, T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Carrier Assignment to Improve the Transmission Efficiency of Edge Terminal in OFDMA Downlink Cellular System

M. Fushiki, T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Autonomous Collision-less Slot Assignment Algorithm for Wireless Sensor Networks

R. Chandradasa, T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

CDMA slotted ALOHA Systems with Successive Interference Cancellation for Inter-Vehicle Communications

A.Sakata, T.Yamazato, H.Okada, M.Katayama

IEICE General Conference page： - 2008.3

Performance Comparison of SC/MMSE Turbo Equalization and MMSE Equalization in Inter-Vehicle Communication using MC-CDMA

N. Hiraiwa, A. Sakata, T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Time Variation of Narrowband Channel Characteristics of Indoor Power-Line Channels

Y. Sugiura T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Adaptive modulation for power-line communications with nonwhite and cyclostationary noise

N. Sawada, T. Yamazato, M. Katayama

IEICE General Conference page： - 2008.3

Performance Improvement of Downlink MC-CDMA Cellular System with an Intermittent Transmission Reviewed

M.Fushiki, T.Yamazato, M.Katayama

IEEE Radio and Wireless Symposium page： - 2008.1

Language：English

Throughput performance of MC-CDMA systems depends on the success in managing interference arising from intercell transmission. In this paper, we propose a new intercell interference mitigation scheme for downlink MC-CDMA scheme. In the proposed scheme, a base station transmits downlink signals intermittently to mobile terminals at the edge of cell. The intercell interference can be seen as a partial interference depend upon the on and off period of the adjacent downlink signals. So it is possible for the channel equalizer to suppress this partial intercell interference by setting the weight changes in accordance with the intercell interference. As results, the frame error rate of the proposed scheme is always better than that of the conventional scheme and good throughput performance is achieved especially when the traffic is high.

A New SC/MMSE Turbo Equalization for MC-CDMA to use in Inter-Vehicle Communication Reviewed

Hiraiwa Noriaki, Sakata Atsunori, Yamazato Takaya, Katayama Masaaki

68TH IEEE VEHICULAR TECHNOLOGY CONFERENCE, FALL 2008 page： 1193 - 1197 2008

A route establishment scheme for multi-route coding in multihop cellular networks Reviewed

Hiraku Okada, Hitoshi Imai, Takaya Yamazato, Masaaki Katayama, Kenichi Mase

Journal of Networks Vol. 3 ( 7 ) page： 34 - 40 2008

Language：English Publishing type：Research paper (scientific journal) Publisher：Academy Publisher

Since the network topology in multihop cellular networks is flexible, multiple routes from a user station to a base station can be established. To reduce packet reception errors of wireless links, a multi-route coding scheme was proposed. An important issue of the multi-route coding is to develop an efficient route establishment scheme. In this paper, we propose a route establishment scheme for multi-route coding in multihop cellular networks. Our proposed scheme consists of a route selection method based on the bit error rate of each wireless link and a hybrid-type multipletree routing protocol. We evaluate the performance of our proposed scheme by a computer simulation and show the resulting improvement in the packet error. © 2008 Academy Publisher.

DOI： 10.4304/jnw.3.7.34-40

Bit and Power Allocation for Power-Line Communications under Nonwhite and Cyclostationary Noise Environment Reviewed

Sawada Naoya, Yamazato Takaya, Katayama Masaaki

ISPLC: 2009 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS page： 307 - + 2008

Bit and Power Allocation for Power-Line Communications under Nonwhite and Cyclostationary Noise Environment Reviewed

Naoya Sawada, Takaya Yamazato, Masaaki Katayama

ISPLC: 2009 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS page： 307 - + 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

This manuscript discusses the adaptive OFDM system for narrow-band power-line communications with nonwhite and cyclostationary noise environment. The bit and power allocation algorithm is proposed with the considerations on the cyclostationarity of power-line noise. Numerical evaluation shows that the proposed method can improve the average BER performance under PLC noise environment.

Energy Efficiency of Cooperative MISO Technique in Multi-Hop Wireless Sensor Networks Reviewed

Huang Zheng, Yamazato Takaya, Katayama Masaaki

ISSNIP 2008: PROCEEDINGS OF THE 2008 INTERNATIONAL CONFERENCE ON INTELLIGENT SENSORS, SENSOR NETWORKS, AND INFORMATION PROCESSING page： 511 - + 2008

Error Correcting Scheme for Road-to-Vehicle Visible Light Communication using LED Array Reviewed

Shohei Mase, Shintaro Arai, Takaya Yamazato, Tomohiro Yendo, Toshiaki Fujii, Masayuki Tanimoto, Yoshikatsu Kimura

PROCEEDINGS OF THE 11TH INTERNATIONAL IEEE CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS page： 1113 - + 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

In this paper, we propose an improved coding scheme for optical wireless communication systems using a LED array transmitter and a high-speed camera as the receiver on a vehicle. Previously, we have proposed a hierarchical coding scheme which allocated the data to spatial frequency components depending on the priority. In that scheme, the high-priority data can be received even if the receiver was far from the transmitter: We confirmed the advantage of the hierarchical coding scheme, but the bit error performance was not sufficient. In this paper, we divide the data into spatial frequency components, and us: error correcting code for each spatial frequency components' data. Experimental evaluation demonstrates the improvement in BE R performance. This improvement implies that the system range increased compared to the previous method.

Energy Efficiency of Cooperative MISO Technique in Multi-Hop Wireless Sensor Networks Reviewed

Zheng Huang, Takaya Yamazato, Masaaki Katayama

ISSNIP 2008: PROCEEDINGS OF THE 2008 INTERNATIONAL CONFERENCE ON INTELLIGENT SENSORS, SENSOR NETWORKS, AND INFORMATION PROCESSING page： 511 - + 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

In this paper, the energy efficiency of cooperative Multiple-Input Single-Output (MISO) technique for a multi-hop wireless sensor network is investigated and compared with other transmission schemes. Firstly, we present different schemes or data transmission of the cluster farther from base station and calculate their energy consumptions. The results show that the optimal transmission scheme varies with the inter-cluster distance in different networks. Then we explore the lifetime of the network and find that it is not always the optimal to employ the multi-hop transmission and the single-hop transmission outperform the multi-hop under a certain distance threshold. In addition, the effects of the transmission bit rate and the required bit error ratio (BER) on the distance threshold are also clarified.

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