Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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A Mathematical Model of Narrowband Power-Line Noise Based on Measurements Reviewed

M. Katayama, T. Yamazato, H. Okada

9th International Symposium on Power-Line Communications and Its Applications page： 152-156 2005.4

Language：English

This manuscript introduces a mathematically tractable and accurate model of narrowband power-line noise based on experimental measurements. In this model, the noise is expressed as the sum of cyclostationary Gaussian processes. The non-stationary features of power-line noise are represented with a small number of parameters, and the noise waveforms generated with the model achieve good agreement with those of actually measured noise.

A-5-26 A Study on Hierarchical Coding for Parallel Optical Wireless Communication Systems Reviewed

Masuda Kyoichiro, Yamazato Takaya, Okada Hiraku, Katayama Masaaki

Proceedings of the IEICE General Conference Vol. 2005 page： 142 2005.3

An Adaptive Receiver for Power-Line Communications with the Estimation of Instantaneous Noise Power Reviewed

HIRAYAMA Yuichi, OKADA Hiraku, YAMAZATO Takaya, KATAYAMA Masaaki

IEICE Transactions on Fundamentals, A Vol. 88 ( 3 ) page： 755 - 760 2005.3

Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

The noise on power-lines is non-stationary, while the instantaneous noise power in different frequency bands are dependent. Under such noise environments, the instantaneous noise power in a frequency band can be estimated by observing the noise in other frequency bands. In this paper, we propose a receiver structure which uses the estimated instantaneous noise power in the decoding process and show its superiority in BER performance to conventional systems.

CiNii Research

An Analysis of the Maximum Throughput on CDMA Packet Communication Systems Employing Successive Interference Cancellation Reviewed

Y. Tadokoro, H. Okada, T. Yamazato, and M. Katayama

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. J88-A ( 3 ) page： 429-433 2005.3

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

This letter analyzes the maximum throughput on CDMA packet communication systems employing successive interference cancellation. This analysis is performed in terms of received signal-power distribution. The optimum received signal-power distribution which achieves the maximum throughput is shown to be the optimum one on BER with the limitation of packet transmission.

Research on Clutter Reduction Methods of a UWB Chaotic Radar Reviewed

Dake, Y. Uwate, Y. Nishio, T. Yamazato

2005 RISP International Workshop on Nonlinear Circuits and Signal Processing (NCSP05) page： - 2005.3

A course enhanced by WebCT Invited Open Access

T. Yamazato

Nagoya Journal of Higher Education Vol. 第５号 page： 49-64 2005.3

Language：Japanese Publishing type：Research paper (bulletin of university, research institution)

WebCT (Web Course Tools) is a course management systems (CMS) that have been developed at British Columbia University to support faculty members for designing, developing and managing his/her class. The WebCT offers many useful tools, such as displaying html-files, discussion board, e-mail, online-quiz, and so on. After using WebCT for several years, I found that it is possible to teach dynamically and interactively. Some of experiences I have learned using WebCT are reported, such includes a dynamic course administration, discussions among students, extensive study contents, and so on. As a conclusion, a need of faculty support is essential to enhance teaching and learning in Nagoya University especially for those using WebCT.

DOI： 10.18999/njhe.5.49

Open Access

A Simplified Regenerative Repeater for Satellite Communications

H. Kuwamura, S. Saiki, A. Ogawa, T. Yamazato, S. Kawai

IEICE General Conference Vol. B-3-17 page： 345 2005.3

Performance Evaluation of Multi-route Turbo Coding using Parity Check Codes

N. Nakagawa, H. Okada, T. Wada, T. Yamazato, M. Katayama

IEICE General Conference Vol. B-5-141 page： 590 2005.3

A Study on Hierarchical Coding for Parallel Optical Wireless Communication Systems

K. Masuda, T. Yamazato, H. Okada, and M. Katayama

IEICE General Conference Vol. A-5-26 page： 142 2005.3

A Study on Successive Interference Cancellation for Hierarchical Coding in Parallel Optical Wireless Communication Systems

H. Okada, K. Masuda, T. Yamazato, M. Katayama

IEICE General Conference Vol. A-5-25 page： 141 2005.3

An Adaptive Receiver for Power-Line Communications with the Estimation of Instantaneous Noise Power Reviewed

Y. Hirayama, H. Okada, T. Yamazato, M. Katayama

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. E88-A ( 3 ) page： 755-760 2005.3

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

A Prototype for a Broadband Software-Defined Base Station Which Processes Signals with Widely Differing Intensity

T. Kitayabu, H. Okada, T. Yamazato, M. Katayama

Technical Report of IEICE Vol. SR04-23 page： 17-22 2005.3

Language：Japanese

This paper discusses the preliminary examinations of a broadband software-defined base station receiver. The authors have been concentrating on the concept of Intelligent Super Base-station (ISB), which processes multiple signals with different modulation schemes at the same time. For the receiver of the ISB, the introduction of a superconductive analog to digital converter (ADC), which has a large bandwidth and high sensitivity, has been proposed. For the realization of such a receiver, as the first step, we designed a prototype receiver with a semi-conductive ADC, which receives and demodulates two FM broadcasting signals at the same time. As a result of the experimentations, influence of the difference of the signal level is clarified, and importance of signal selection algorithm is confirmed.

An adaptive receiver for power-line communications with the estimation of instantaneous noise power Reviewed

Y Hirayama, H Okada, T Yamazato, M Katayama

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES Vol. E88A ( 3 ) page： 755 - 760 2005.3

Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

The noise on power-lines is non-stationary, while the instantaneous noise power in different frequency bands are dependent. Under such noise environments. the instantaneous noise power in a frequency band can be estimated by observing the noise in other frequency bands. In his paper, we propose a receiver structure which uses the estimated instantaneous noise power in the decoding process and show its superiority in BER performance to conventional systems.

DOI： 10.1093/ietfec/e88-a.3.755

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逐次型干渉除去法を用いたCDMAパケット通信システムにおける最大スループットの解析 Reviewed Open Access

田所幸浩, 岡田啓, 山里敬也, 片山正昭

電子情報通信学会論文誌 A Vol. J88-A ( 3 ) page： 429 - 433 2005.3

An Adaptive Receiver for Power-Line Communications with the Estimation of Instantaneous Noise Power Reviewed

Y. Hirayama, H. Okada, T. Yamazato, M. Katayama

IEICE Transaction on Fundamentals of Electronics, Communications and Computer Sciences Vol. E88-A ( 3 ) page： 755-760 2005.2

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

*A Tutorial on Multiple Access Technologies for Beyond 3G Mobile Networks Invited Reviewed

A. Jamalipour, T. Yamazato, T. Wada

IEEE Communication Magazine Vol. 43 ( 2 ) page： 110-117 2005.2

Authorship：Lead author Language：English

Beyond third-generation (B3G) wireless cellular systems are recognized as systems that can achieve high data-rate transmission beyond those currently provided by the second- and third-generation (2G/3G) wireless cellular systems and are capable of delivering multiple services to users at different locations under very diverse channel conditions. B3G systems should provide services comparable to those offered by wired networks for a variety of applications such as interactive multimedia, VoIP (voice over Internet protocol), network games, videoconferencing, etc. The current trend is that B3G will be based on IP technology, and therefore, all-IP [1] architecture design has been an important research topic in the past few years. Those systems will need to support multiple services ubiquitously in different types of environment including indoor, outdoor (with low and high velocity), and up to global broadband access (satellite). Thus, they would be deployed in a heterogeneous environment of various physical access networks of wireless and wired systems. The network heterogeneity means that the physical access network underlying the B3G system will support different levels of data rates and different mobility and traffic management techniques govern individual systems. In this context, the B3G mobile systems will face at least two predominant constraints: a) heterogeneity in physical access network, and b) change of application types from commonly low data rates into more bandwidth demanding real-time and multimedia ones. In such situation, providing quality of service to users would become even more difficult that what we are currently dealing. One of the main issues involved in the development of B3G systems is the choice of multiple access (MA) technology that could efficiently share the available bandwidth to large number of users. The choice of MA technique could significantly enhance or damage the service quality delivered to end users. It is known that the existin

A tutorial on multiple access technologies for beyond 3G mobile networks Reviewed Open Access

A Jamalipour, T Wada, T Yamazato

IEEE COMMUNICATIONS MAGAZINE Vol. 43 ( 2 ) page： 110 - 117 2005.2

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

In this article some fundamental technical concepts of the main multiple access schemes for wireless mobile systems are reviewed, and a path for development of appropriate multiple access technologies for next-generation mobile networks, or so-called beyond 3G (B3G), is established. We first review the multiple access technologies in second- and third-gene ration wireless cellular systems from historical and technical points of view. This review is followed by a novel formulization of the multiple access schemes through mathematical expressions that could simplify the process of development of new multiple access schemes for B3G wireless cellular systems. We then list the most important features of multiple access schemes in 3G mobile systems. Finally, we conclude the article by reviewing the most promising multiple access technologies for B3G mobile cellular systems.

DOI： 10.1109/MCOM.2005.1391509

A tutorial on multiple access technologies for beyond 3G mobile networks Reviewed Open Access

Jamalipour A, Wada T, Yamazato T

IEEE COMMUNICATIONS MAGAZINE Vol. 43 ( 2 ) page： 110 - 117 2005.2

Performance analysis of multi-route packet combining scheme for real-time communications in wireless multihop networks Reviewed Open Access

Y. Hirayama, N. Nakagawa, H. Okada, T. Yamazato, and M. Katayama

IEICE Transactions on Communications Vol. J88-B ( 1 ) page： 269-279 2005.1

Language：Japanese Publishing type：Research paper (scientific journal)

In this paper, we consider real-time packet communications in wireless multihop networks. In real-time packet communications, packet retransmission cannot be used because it may produce undesired delays. In this case, it is necessary to be employed a technique which can reduce the influence of packet errors. We propose to apply a multi-route packet combining scheme to wireless multihop networks. We analyze two characteristics of the proposed system. One is the average packet error probability, which is obtained as a function of a elapsed time. The other is the required time for achieving a required packet error probability.

Open Access

Time-Dependent Analysis of the Multiple-Route Packet Combining Scheme in Wireless Multihop Networks Reviewed

Y. Hirayama, H. Okada, T. Yamazato, M. Katayama

International Journal of Wireless Information Networks Vol. 12 ( 1 ) page： 35-45 2005.1

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

In this paper, we apply the multiple-route packet combining scheme to wireless multihop networks in order to support delay-sensitive applications. The performance of the system is time-dependent and is greatly affected by network-level performance. Therefore, it is necessary to develop an analytical framework to evaluate the per- formance of the system with taking into account its time-dependency. We use queuing theory to analyze the performance of the system. From numerical results, it is shown that the performance degradation of the system is mainly caused by the increase of packet delay, which is due to the increase of the traffic intensity. To prevent the increase of traffic,we propose a packet discarding scheme. We analyze the average packet error probability of the proposed system with the equilibrium point analysis (EPA). Numerical results show that the packet discarding scheme can improve the average packet error probability under heavy traffic conditions.

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Papers - YAMAZATO Takaya