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.  

Academic degrees
Ph.D.  Tokyo Denki University  2001/03 

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

Research Areas
Communication/Network Engineering 

Research keywords
digital television 
radio navigation 
electromagnetic applications 
cognitive radios 
radar 
MIMO 
radiowave simulation 
mobile radio propagation 
OFDM 
CDMA 

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 (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. 
Research paper (scientific journal)  Only  Detection of EEW wake-Up signal with AC parity for ISDB-T television receivers  Satoshi Takahashi  IEICE Communication Express (ComEX)  The Institute of Electronics,Information and Communication Engineers  5/ 7, 203-208  2016/07  When local meteorological agencies advise an emergency alert, ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) television broadcasters would send a special signal to wake up the receivers. There are two ways of waking up: "Emergency Warning System (EWS)" that advises tsunami and earthquake disasters, and "Earthquake Early Warning (EEW)" that advises significant earthquake disasters. For detecting EWS wake-up indications, the use of the parity has been proposed. The method assumed the broadcasters do not change the message except for the wake-up indication. Because we cannot apply the method to an EEW wake-up indication detection, this letter proposes a method for EEW. 
Research paper (international conference proceedings)  Only  Comparison of two majority determination methods of detecting emergency wake-up trigger for ISDB-T terrestrial digital television receivers  Satoshi Takahashi  The International Wireless Communications & Mobile Computing Conference (IWCMC 2015)  194-198  2015/08 
Research paper (international conference proceedings)  Only  Detection of emergency wake-up trigger signal with TMCC parity and subcarrier frequency diversity for ISDB-T digital television receivers  Satoshi Takahashi  10th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT 2015)  1-3  2015/08 
Research paper (international conference proceedings)  Only  A novel method of determining EWS wake-up trigger for ISDB-T digital television receivers  Satoshi Takahashi  The 10th IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob 2014) Workshop on Emergency Networks for Public Protection and Disaster Relief (EN4PPDR)  IEEE  407-412  2014/10  ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) digital television broadcasters would send a special signal to wake up receivers when an emergency alert is advised. The wake-up procedure is defined as EWS (Emergency Warning System) and the trigger is sent in a single bit of the control message called TMCC (Transmission and Modulation Configuration Control). Wrong determination of the trigger leads to a false alarm and increases power consumption while idle. In this paper, a method of determining the EWS wake-up trigger is proposed by assuming the broadcasters do not change TMCC message except for the trigger when the broadcaster advises an emergency alert. For reducing the false alarm, this paper proposes using the TMCC parity for the reliable determination of the trigger. Results showed the proposed method was almost free from a false alarm. 
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Research presentations
Oral presentation(general)  送信電力制御シュードライトの高所設置による遠近問題の軽減  IEICE Technical Report, CQ2016-52  2016/11  Three-dimensional satellite navigation on the ground requires radiowave reception from more than the four satellites. The use of a pseudo satellite, or pseudolite, would be a possible way for enabling us to know a users position. It is usually placed on the ground, transmits radiowave that is the same format as the navigation satellites transmit, and acts as the navigation satellite. We can use a pseudolite as one of a needed satellite of obtaining the position within a distance the receiver can use the radiowave. In close vicinity to a pseudolite, however, the receiver encounters an excessive reception power and it results in lost of the position by blocking the satellite radiowaves. The phenomena is referred to as the near-far problem. For alleviating the effect, the burst pulse transmission and its power control have been proposed for the pseudolite radiowave. This paper evaluates increase in the availability of a pseudolite signal and reducing interference due to the near-far problem by elevating the pseudolite. 
Oral presentation(general)  複数の制御信号サブキャリヤを周波数ダイバシチ合成するISDB-T移動テレビ受信機の緊急自動起動信号受信方法の比較  IEICE Technical Report, CQ2016-52  2016/11  In an emergency situation, broadcaster can wake up the receivers automatically by sending a special signal superposed on the transmission radiowave. ISDB-T terrestrial digital television transmits the emergency wake-up signal on one of the control signals, and it enables us to reliably convey the signal to the receivers. An ISDB-T broadcasting signal is sent by various subcarriers, and the control signal information is also sent by the several subcarriers that contain the same information and is repeated cyclically in every 0.2 second. Because ISDB-T conveys videos for not only fixed receptions but also mobile receptions, it is important for mobile receiver to reliably determine the emergency wake-up signal. In this paper, the requirement of the subcarrier frequency diversity is presented, Then, the performance of the single bit detection, the error correction detection, and the parity majority detection are compared in terms of misdetection and false alarm. 
Oral presentation(general)  A reception method of TMCC signals for ISDB-T mobile television receivers  ITE Annual Convention, 12D1  2016/08  This report presents a method of receiving TMCC on ISDB-T broadcasting signals. TMCC signals contain the emergency wake-up trigger and the efficient reception would be useful for a prompt disaster alert. For decoding multiple TMCC subcarriers, the matrix representation of the low intermediate frequency receiver is proposed. 
Oral presentation(general)  A method of receiving control signals for ISDB-T mobile television receivers  IEICE Technical Report, CQ2016-52  2016/08  This report examines a method of receiving the automatic wake-up signals for detecting events of the Emergency Warning System (EWS) and the Earthquake Early Warning (EEW) on ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) signals. These wake-up signals are sent in specific subcarriers of OFDM (Orthogonal Frequency Division Multiplexing ) modulated broadcasting signals. For mobile television receivers where they encounter a higher bit error due to the frequency selective fading, the frequency diversity over the subcarriers that contain the same message is required. In this report, the digital signal processing in the digital low intermediate frequency (low IF) structure is considered and the demodulation method with the matrix representations over the subcarrier frequency components is proposed. 
Oral presentation(general)  Detecting broadcaster transmitted earthquake early warning signal with AC Parity for ISDB-T digital television receivers  IEICE Information and Communication Technology Forum (IEICE ICTF 2016)  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: Emergency 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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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
解析学I演習 
情報基礎数学 
通信方式 
情報理論 
集積回路 
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Social activities
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 
Technical Program Committee (TPC) member of International Conference on Control, Electronics, Renewable Energy, and Communications (ICCEREC 2017)  2017/01-2017/12 
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Memberships of academic societies
The Institute of Electronics, Information, and Communication Engineers  1989/04-Present 
The Institute of Image Information and Television Engineers  2010/06-Present 
The Institute of Electrical and Electronics Engineers, Inc.  1995/04-Present 
The Information Processing Society of Japan  1990/04-Present 
Society of Information Theory and its Applications  2003/04-2008/03 
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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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