日本語
Hiroshima City University 
Graduate School of Information Sciences 
Dept. of Computer and Network Engineering 

顔写真 Associate Professor 
Takahashi Satoshi 

My website is here.  

Licenses and qualifications
第一級陸上無線技術士  1993/04/12 

Research Areas
Communication/Network Engineering 
Measurement engineering 

Research keywords
long distance radio communications 
cognitive radios 
radar 
satellite navigation 
radio signal detection 

Bibliography
ゴールドスミス ワイヤレス通信工学 基礎理論からMIMO,OFDM,アドホックネットワークまで  高橋 賢 ほか訳  6章,7章, 付録B, 付録Dを執筆。  丸善株式会社  2007/05 
無線通信技術大全  高橋 賢 分担著、阪田史郎・嶋本 薫 監修  第2章を執筆。  リックテレコム  2007/02 
コンパクト移動通信辞典  小林 岳彦, 高橋 賢  丸善株式会社  2003/09 
移動通信基礎技術ハンドブック  高橋 賢 分担訳, 羽鳥光俊, 小林岳彦監修  1, 2, 4, 5, 6, 7, 8, 12, 14, 15, 16, 18, 21, 22, 24, 32, 33章の翻訳修正と未訳箇所の翻訳を担当。  丸善株式会社  2002/03 
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Papers
Research paper (scientific journal)  Only  Asymmetric memoryless binary channel approximation for automatic wake-up signal transmission channel in ISDB-T emergency warning broadcasting  Satoshi Takahashi  The Journal of The Institute of Image Information and Television Engineers  The Institute of Image Information and Television Engineers  72/ 6, J94-J97  2018/06  10.3169/itej.72.J94  English abstract is available. 
Research paper (scientific journal)  Only  Asymmetric memoryless binary channel approximation for automatic wake-up signal transmission channel in ISDB-T emergency warning broadcasting  Satoshi Takahashi  The Journal of The Institute of Image Information and Television Engineers  The Institute of Image Information and Television Engineers  72/ 1, J47-J50  2018/01  10.3169/itej.72.J47  English abstract is available. 
Research paper (international conference proceedings)  Joint  A modeling of eigen-states in In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure using photocurrent spectroscopy  Koichi Tanaka, Hikaru Imatoku, Makoto Fujiwara, Naohisa Happo and Satoshi Takahashi  The 2017 International Symposium on Nonlinear Theory and Its Applications (NOLTA2017)  681-684  2017/12 
Research paper (international conference proceedings)  Only  Majority determination and subcarrier diversity of detecting broadcaster advised emergency wake-up signal for ISDB-T television receivers  Satoshi Takahashi  The 2017 International Symposium on Nonlinear Theory and Its Applications (NOLTA2017)  542-545  2017/12  In an emergency, broadcaster would send a special signal to wake up their idle receivers. In ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) digital television, the emergency wake-up signal is sent on one of the control signals. As the control signal is sent over several subcarriers that contain the same information, the subcarrier diversity is possible for reliably determining the signal. Because ISDB-T broadcasting signal carries video contents not only for fixed receptions but also for mobile receptions, this paper focus on determining the wake-up signal for mobile receivers. In this paper, the performance of determining the wake-up signal with the subcarrier frequency diversity is presented. Then, the performance of determining the wake-up signal is presented by misdetections and false alarms. 
Research paper (international conference proceedings)  Only  Detecting broadcaster transmitted earthquake early warning signal with AC Parity for ISDB-T digital television receivers  Satoshi Takahashi  IEICE Information and Communication Technology Forum (IEICE ICTF 2016)  The Institute of Electronics,Information and Communication Engineers  1-4  2016/07  When significant disaster occurs, certain television broadcasters can wake up their receivers with a special signal. Such wake-up televisions are already available in the world. In ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) digital television in Japan, there are two wake up methods: Emer- gency Warning System (EWS) and Earthquake Early Warning (EEW). A wake-up indication of EWS comes from a single bit of the control channel and a method of efficiently detecting the wake up signal with parity variations is known. The EEW wake-up signal, however, contains detailed information messages in addition to the wake-up indication. This paper focuses on determining only the EWS wake-up indication and proposes a method of detecting the indication. 
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Research presentations
Oral presentation(general)  Analysis of mutual information for ISDB-T periodic automatic wake-up receivers  IEICE General Conference, B-8-24  2018/03  To appear. 
Oral presentation(general)  Dependence of determination methods on mutual information obtained from ISDB-T emergency warning signal reception  IEICE Technical Report, CS2017-111  2018/03  In an emergency, some ISDB-T television receivers would wake up themselves by receiving a broadcaster transmitted special signal. The mechanism waking up is that the tuner at the receiver continues work while the main power has turned off, and the tuner waits for the wake-up signal. On the other hand, bit error that fading and the receiver noise cause loses the information regarding the wake-up signal. In this report, the probability a receiver wrongly activated is analyzed approximating the mechanism to the asymmetric memoryless binary channel. The probability that a broadcaster advices an emergency and that would be rare, and the bit errors at the receiver are used in the approximation. 
Oral presentation(general)  Analysis of capture effect in Rayleigh fading environments with characteristic function method  ITEJ Technical Report, BCT2018-42  2018/03  In an emergency, some ISDB-T television receivers would wake up themselves by receiving a broadcaster transmitted special signal. The mechanism waking up is that the tuner at the receiver continues work while the main power has turned off, and the tuner waits for the wake-up signal. On the other hand, battery capacity in a mobile receivers would be limited and the tuner would be activated periodically. In this report, the probability a receiver wrongly activated is analyzed approximating the mechanism to the asymmetric memoryless binary channel. The probability that a broadcaster advices an emergency and that would be rare, the duty ratio the receiver wakes up, and the bit errors at the receiver are used in the approximation. 
Oral presentation(general)  Analysis of capture effect in Rayleigh fading environments with characteristic function method  ITEJ Technical Report, BCT2018-23  2018/01  In general, receiving several radiowave signals interferes each other at a receiver. Under certain conditions, however, a signal having the largest magnitude controls the output at the demodulator in the receiver. The phenomenon is referred to as the capture effect. The report analyses the capture effect of two digital modulation signals having Rayleigh fading by means of the characteristic function method. 
Oral presentation(invited, special)  [Invited Talk] A method of determining automatic wake-up signal of ISDB-T emergency warning broadcasting  IEICE Technical Report, RCS2017-258  2017/12  In ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) terrestrial digital television systems, it is possible to wake up television receivers with the special signal sent from the broadcaster when in emergency. In this report, a method of reliably determining the wake-up signal is proposed using the parity of TMCC (Transmission and Multiplexing Configuration Control), a control signal that is also used for the wake-up signal. Since a disaster would rarely occur, reception performance of the wake-up signal is analyzed calculating the mutual information to be obtained from a such wake-up receiver. 
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Intellectual property rights
Patent  緊急地震速報信号の受信装置及び受信方法  特願2015-125736  2015/06/23 
Patent  緊急警報放送信号の受信装置及び受信方法  特願2013-117319  2013/05/15  特開2014-225853  2014/12/04 
Patent  通信システム、通信方法、基地局、および移動局  特許公開2005-252964  2005/09/15 
Patent  音声およびデータサービス用無線通信システム  特許公開2003-283408  2003/10/03 
Patent  端末に対して送信する信号の伝送速度または送信電力を変化させる無線通信装置およびその信号送信方法  特許公開2003-163632  2003/06/06 
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Prizes
電子情報通信学会通信ソサイエティ活動功労賞(通信方式研究会幹事に対する貢献)  2016/09 
電子情報通信学会通信ソサイエティ活動功労賞(論文査読に対する貢献)  2016/09 
電子情報通信学会通信ソサイエティ活動功労賞(論文査読に対する貢献)  2012/09 
電子情報通信学会通信ソサイエティ活動功労賞(論文査読に対する貢献)  2009/09 
電子情報通信学会通信ソサイエティ活動功労賞(論文査読に対する貢献)  2006/09 
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Allotted class
情報基礎数学 
情報理論 
情報通信システム特論 
通信方式 
集積回路 
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Social activities
LPWAの基礎と応用, ワイヤレスIoTセミナー 〜新技術LPWAが拓く可能性〜  2018/03/07-2018/03/07  あらゆるヒト・モノ・コトがインターネットにつながるIoTは、その導入・利活用により、業務の効率化やコスト削減が可能と なり、新たなビジネスの創出を図る有効な手段として大きな期待が寄せられているが、IoT通信のラストワンマイルとして注 目を集めている新たな無線通信システム LPWAについても、実証実験や事業化の動きが活発化しており、今後急速な普 及が見込まれることから、デモ展示を併せたセミナーを開催し、LPWAの周知及び導入促進を図る。 
Local arrangement of technical committee of radio communication systems  2017/12-2017/12 
Reviewer of 2017 Asia-Pacific Microwave Conference (APMC 2014)  2017/05-2018/04 
Associate editor of special section on wideband systems of IEICE Transactions  2017/04-2018/03 
Technical Program Committee (TPC) member of International Conference on Communications (ICC 2017)  2017/01-2017/12 
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Memberships of academic societies
The Institute of Electronics, Information, and Communication Engineers  1989/04/01-Present 
The Institute of Image Information and Television Engineers  2010/06/01-Present 
The Institute of Electrical and Electronics Engineers, Inc.  1995/04-Present 
The Information Processing Society of Japan  1990/04-Present 
The Institute of Positioning, Navigation and Timing of Japan  2018/04/01-Present 
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Open lecture
ひろしまコンピュータサイエンス塾〜情報科学ってスゴイ〜  Open lecture  2012/01-2012/01  講座「通信」 
広島市研究公開  Others  2009/12-2009/12  移動無線通信、電波応用工学 
ひろしまコンピュータサイエンス塾〜情報科学ってスゴイ〜  Others  2009/12-2009/12  講座「通信」 
EXPO '09広島  Others  2009/11-2009/11  移動無線通信、電波応用 
リエゾンフェスタ  Open lecture  2009/09-2009/09 
オープンキャンパス  Open lecture  2009/08-2009/08 
リエゾンフェスタ  Open lecture  2008/09-2008/09 
オープンキャンパス  Open lecture  2008/08-2008/08 
リエゾンフェスタ  Open lecture  2007/09-2007/09 
オープンキャンパス  Open lecture  2007/08-2007/08 
公開講座  Open lecture  2006/11-2006/11  移動通信の光と影 
リエゾンフェスタ  Open lecture  2006/09-2006/09 
オープンキャンパス  Open lecture  2006/08-2006/08 
公開講座(連続講義)  Open lecture  2005/12-2005/12  電子メールは、相手に気兼ねなくメッセージを送ることができ、記録を残すことができることから、最も広く使われている道具の一つになったといえます。その一方で迷惑メールが急増し、不愉快な思いをすることも多くなりました。そこで、この講座では、インターインターネットや携帯電話のつながる仕組みや、メールが届く仕組み、社会的背景を考察することで迷惑メールを撃退する方法を探ります。 
オープンキャンパス  Open lecture  2005/08-2005/08 
基礎から学ぶ情報科学  Public lecture  2005/08-2005/08  完全撃退!迷惑メール 1. なぜ私のところに迷惑メールが来るの? 2. ネットは大人になってから? 3. これでわかったメールとネット 
模擬授業  Public lecture  2005/06-2005/06  携帯電話と暗号 
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