All posts by d-wise-lab


English follows Japanese.

2015年3月に滋賀県立命館大学で開催されたIEICE 2015年総合大会において、修士1年川畑大樹君、尾形 駿君が下記のテーマで発表を行いました。

“チャネル分布情報を用いたエナジーハーベスティング中継端末の選択法に関する一検討”,川畑大樹,Abreu Giuseppe,Vuppala Satyanaranaya,石橋功至

“Frameless ALOHAにおけるターゲット重みの最適化”,尾形駿,ジュゼッペ  アブレウ,石橋功至

Our members, Hiroki Kawabata and Shun Ogata gave presentations titled “A study on energy harvesting relay selection using channel distribution information”  and “Optimization of the target degree of frameless ALOHA,” respectively at the 2015 IEICE General Conference.


English follows Japanese.

2015年3月に東京工業大学で開催されたRCS研究会において、修士2年 武石直樹君、修士1年 尾形 駿君が下記のテーマで発表を行いました。

“分散多次元空間結合Repeat-Accumulate符号”, 武石直樹, 石橋功至, アブレウ ジュゼッペ

“フレームレスALOHAにおけるターゲット重み分布の密度発展法を用いた最適化”, 尾形 駿, アブレウ ジュゼッペ, 石橋功至


Our members, Naoki Takeishi and Shun Ogata gave presentations about distributed multi-dimensional spatially coupled Repeat-Accumulate code and optimization of target degree distribution using density evolution for frameless ALOHA, respectively at IEICE RCS, Tokyo, Japan.

Our paper has been accepted to IEEE WCNC’15.

Our paper entitled “spatially-coupled repeat accumulate coded cooperation” has been accepted to IEEE WCNC’15 will be held at New Orleans, LA.

The program of Track1 (PHY and Fundamentals) is available at the following website:

The paper proposes the effective technique to simultaneously obtain the diversity and coding gain even when both the number of users and the length of information packets are limited. The proposed approach significantly improves the decoding performance compared with conventional cooperative techniques.

Special Guest Lecture @ Jacobs University Bremen

Professor Ishibashi gave a special guest lecture about RF energy harvesting and cooperative communications at Jacobs University Bremen in Bremen, Germany on Dec 8, 2014.

Abstract: In this talk, we provide an overview of radio frequency (RF) energy harvesting technology, which scavenges the energy from ambient radio signals. As an example of wireless-powered cooperative diversity, we introduce dynamic-harvest-and-forward (DHF) cooperation which enables to obtain diversity gain with consuming neither extra energy nor extra bandwidth by exploiting the relay’s proximity advantage over the destination. We analyze the DHF cooperation from the aspect of diversity-multiplexing tradeoff (DMT) and prove that it can achieve diversity order of two. Also, some open issues regarding cooperative diversity with RF energy harvesting are presented.

Further details can be found in the following link:


English follows Japanese:



本研究室では特に問題解決能力、プレゼンテーション能力の向上を中心とした教育を行い、世界で活躍できる人材の育成を目指します。また修士課程では、欧米を中心に短期研究留学に挑戦することを推進しています(今年度はドイツ・Jacobs Universityに修士学生3名が4ヶ月間の研究留学中)。





Thank you for your interest in our laboratory.

We are investigating vast area of communication technologies in order to make our world more fascinating. We are now working on several projects on RF energy harvesting, cooperative communications, rateless coding, and advanced network coding in collaboration with professors and researchers not only in Japan but also in foreign countries such as Germany, Korea, United States, and so on.

Thus, our laboratory applicants should be:

  • able to work with people with different cultures;
  • able to work in an engineering environment; and
  • proficient at computer programming and/or mathematics

f you are interested in working with me, please join an AWCC orientation that will be held at 2:00pm at room 319 in E-10 building on Nov. 21 or 22 and get contact with me via email.