Current Affiliation Organization 【 display / non-display 】

Current Affiliation Organization 【 display / non-display 】

University 【 display / non-display 】

University 【 display / non-display 】

Graduate School 【 display / non-display 】

Graduate School 【 display / non-display 】

Study abroad experiences 【 display / non-display 】

Study abroad experiences 【 display / non-display 】

display all >>

Academic degree 【 display / non-display 】

Academic degree 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• An ICI Canceling Underwater OFDM Communication System with 2-Step Modified Delay and Doppler Profiler

  Suguru Kuniyoshi, Shiho Oshiro, Hiromasa Yamada, Tomohisa Wada

  OCEANS 2024 - Halifax ( IEEE )    2024.11 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  In 2023, the first prototype of an Inter-Carrier-Interference (ICI) Canceling Underwater Orthogonal Frequency Division Multiplexing (OFDM) Communication system was proposed using modified Delay and Doppler Profiler (mDDP). However, the Bit Error Rate (BER) reduction was limited. As a result of continuous research, we found that the two-stage configuration of mDDP can dramatically improve BER reduction performance. This paper presents the results of pool experiments of OFDM communications in forward and reverse two-wave Doppler-shift environments. To mitigate the ICI effect, a modified Delay and Doppler Profiler (mDDP), which estimates not only attenuation, relative delay and Doppler shift but also sampling clock shift of each multi-path component, is utilized. After the 1st stage mDDP, the effect of ICI has been reduced from the Channel Transfer Function (CTF) and the more accurate CTF is processed by the second-stage mDDP, resulting in highly accurate channel parameter estimation and improved ICI cancellation in the final multi-tap equalizer. To verify this effect, two transmit transducers and one receive transducer were used in the pool experiment to create a two-wave inverse Doppler-shifted multipath environment. By increasing the number of equalizer taps, the BER reduction performance of 64QAM modulation was improved by approximately one order of magnitude for 2step mDDP compared to 1step mDDP.

  • Access this article

    DOI

• Scalability in Autoencoder-based OFDM Communication System

  Seizan Tsugawa, Takao Toma, Shiho Oshiro, Tomohisa Wada

  2023 IEEE International Conference on Computer Vision and Machine Intelligence (CVMI) ( IEEE )    2024.03 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  This paper proposed Scalability in Autoencoder-based Orthogonal Frequency Division Multiplexing(OFDM) communication system. In the previous research, only the comparison between IEEE802.11a and Autoencoder by the conventional OFDM communication system was performed, and it was proved that the communication system created by Autoencoder exceeded the performance of the conventional system. Therefore, in this paper, it uses IEEE802.11n and compare whether it can be improved by expanding the bandwidth and using it.IEEE802.11n standard has an FFT length of 128, a subcarrier number of 114 (108 for data), and modulation schemes of Quadrature Phase Shift Keying(QPSK), 16 Quadrature Amplitude Modulation (16QAM). The GI length is 800ns and the symbol length is 4000ns. In the simulation, a computer simulation was performed using a conventional OFDM communication system and a communication system generated by Autoencoder. Assuming that the simulation environment had an Signal-to-Noise Ratio (SNR) of 0 to 30 and an amplitude r of 0.0 to 1.0, the Symbol Error Rate (SER) status for each SNR was output. As a result of computer simulation, QPSK converged at SNR 27 ㏈ at IEEE 802.11a, but was able to reduce SER overwhelmingly to SNR 12 ㏈ at IEEE 802.11n. Also, in 16QAM the convergence at r=0.0 is the same as for SNR22 ㏈, but in IEEE 802.11a it does not converge after r=0.6, but in IEEE 802.11n it does not converge only at r=0.9 and r=1.0 . As a future task, it will use IEEE802.11ac, which enables communication speeds several times faster than IEEE802.11n, examine whether it is possible to further improve accuracy. And it will continue our research to correspond MIMO communication.

  • Access this article

    DOI

• 5G High Speed DRONE Air Logistics Supported by Advanced 5G Mobile Communication System

  Yusuke Oshiro, Gennan Hayashi, Shiho Oshiro, Tomohisa Wada

  2023 IEEE International Conference on Computer Vision and Machine Intelligence (CVMI) ( IEEE )    2024.03 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  This paper proposes an inter-carrier interference (ICI) canceling OFDM receiver for 5G mobile systems to support high-speed drone logistics at 200 km/h. Such a highspeed drone receiver sees a transmission path consisting of multiple Doppler-shifted propagation channels. the ICI canceller compensates for the ICI generated when the subcarriers lose orthogonality due to the Doppler spread channel. the DMRS (Demodulation Reference Symbol) pilot signal is used to analyze three parameters: distance attenuation of each multipath amplitude component, relative delay time, and frequency deviation due to Doppler shift. ICI cancellation is achieved by generating a channel transfer function (CTF) based on the three parameters and applying the ICI inverse operation. The performance of the ICI cancellation was simulated for the channel conditions specific to high-speed drones, such as 200 km/h, and 5 path reverse Doppler shift for QPSK and 16QAM modulations. By increasing the number of taps in the Multi-Tap Equalizer, the improvement in BER was significant.

  • Access this article

    DOI

• Intelligent mobile channel estimation and Inter Carrier Interference Cancellation for 5G services in Indian Shinkansen “Bullet TRain”

  Gennan Hayashi, Yusuke Oshiro, Shiho Oshiro, Tomohisa Wada

  2023 IEEE International Conference on Computer Vision and Machine Intelligence (CVMI) ( IEEE )    2024.03 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  In recent years, the 5th Generation mobile communication system (5G) has become increasingly popular and is about to meet the growing demand from mobile and IoT devices such as smartphones and drones. As railroads and other modes of transportation become faster, it has become increasingly important to consider communications in high-speed moving environments. In an extremely high-speed moving environment, the Doppler effect occurs for radio waves, resulting in loss of data received and transmitted by mobile terminal. In this paper, we aimed to prevent performance degradation of 5G communications by using Inter-Carrier Interference Cancelation between OFDM sub-carriers of 5G based on Delay and Doppler Profiler as a new signal processing technology to correct the received signal in a high-speed moving environment targeting high-speed trains and bullet trains in India. Simulations of the communication quality of four modulations, Quadrature Phase Shift Keying (QPSK), 16Quadrature Amplitude Modulation (QAM), 64QAM, and 256QAM, were performed in two situations at speeds of 150km/h and 350kmlh. The simulation results show that the Inter-Carrier Interference Canceller used in this study can improve the Bit Error Rate. It was also shown that the error rate of the communication can be further reduce by increasing the number of neighboring sub carriers considered for Doppler shift rejection.

  • Access this article

    DOI

• Intelligent Constellation Generation based on Autoencoder Communication System

  Kaisei Matsumoto, Takao Toma, Shiho Oshiro, Tomohisa Wada

  2023 IEEE International Conference on Computer Vision and Machine Intelligence (CVMI) ( IEEE )    2024.03 [ Peer Review Accepted ]

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  This paper discusses intelligent constellation generation based on autoencoder communication system. In previous studies, the amplitude was set to fluctuate between r=0.0 and 1.0. However, when checking the generated constellation, distortion was confirmed instead of the conventional symbol arrangement. Therefore, in this paper, it compares the case where the amplitude is constant, the case where the average amplitude within a Minibatch is 1, and the case where the average amplitude is 1 for Interval time. The communication standard used in this research is IEEE 802.11a, assuming wireless Local Area Network (LAN) specifications. The IEEE 802.11a standard has an Fast Fourier Transform (FFT) length of 64, a subcarrier number of 52, and Quadrature Phase Shift Keying (QPSK) and 16 Quadrature Amplitude Modulation (QAM), modulation methods. A guard interval of 800 ns is added and the symbol length is 4000 ns. First, a simulation was performed under the condition that the amplitude was kept constant. QPSK with 4 symbols, constant amplitude model is rounded more than previous research result. 16QAM with 16 symbols is arranged regularly like lined up on a line. Second, the simulation was performed under the condition that the average amplitude within the minibatch was set to 1. QPSK with 4 symbols, appears to rotate clockwise. 16QAM with 16 symbols has a more uniform symbol placement than previous research result. Third, a simulation was performed under the condition that the average amplitude within Interval time was set to 1. QPSK with 4 symbols, is the closest to square among QPSK output results so far. The direction is slightly tilted, but if it can be rotated a little more, it may be possible to reproduce the same symbol arrangement as before. 16QAM with 16 symbols, the symbol arrangement is biased as a whole. However, it can be seen that are arranged in line on the line, perhaps due to regularity. As future work, in addition to the conditions set this time, it will examine whether there is a method that can generate a uniform constellation. It will continue to research whether Multiple Input Multiple Output (MIMO) communication such as IEEE 802.11n can also be supported.

  • Access this article

    DOI

display all >>

SDGs 【 display / non-display 】

SDGs 【 display / non-display 】

Media Coverage 【 display / non-display 】

Media Coverage 【 display / non-display 】

• ArduPilot Podcast #11 Guest appearance brilliantly! Chura First Penguin Ms. Oshiro (1/3)  TV or radio program

  Spotify, ApplePodcast, AmazonPodcast  ArduPilot Podcast  2023.6

  Author： Other 

  　View Summary

  Participated as a guest in the podcast [ArduPilot Podcast] by Mr. Wagata and Mr. Kawamura, who are lecturers at the drone engineer training school. We are talking about "Who is Shiho Oshiro". After the recording, two instructors said "We want you to listen to this episode if you are an exam student or you are worried about life."

• [2022 English Edition vol.14] SDGs Special Issue  Newspaper, magazine

  Japan Science and Technology Agency  Science Window  pp. 22 - 25  2023.3

  Author： Other 

  　View Summary

  Science Window is a magazine that introduces science and technology. Both adults and children can enjoy it. Let's think about the relationship between science and technology and society to realize a better future. ―SDGs Special Issue 2022: The Age of Diversity― A Driving Force to Accelerate Innovation - Interview with Yoko Nameki The "Daredemo Piano (The Auto-Accompanied Piano)," Born from the Wish of a High School Student - Interview with Oko Arai Unearthing the Latent Abilities of People with Disabilities COLUMN: Improving Society Through Gender Equality - Interview with Narie Sasaki COLUMN: The Challenge to Remove Fuel Debris - Interview with Misaki Iwabuchi Positive Childbirth Boosted by Appropriate Information Sharing An Underwater Drone Developed by a Pair Who Studied Worldwide Constructing a Story and Sharing It with Many People - Interview with Shun Kawakubo Making More Use of Rainwater in Daily Life COLUMN: Exciting Futures on the World Stage - Interview with the Recipients of the Maria Sklodowska Curie Award for Young Women in Research "STI for SDGs" Award 2022 Awarded Initiatives

• [2022年SDGs特集号] ダイバーシティーはいま  Newspaper, magazine

  科学技術振興機構  サイエンスウィンドウ  pp. 22 - 25  2022.11

  Author： Other 

  　View Summary

  【特集】ダイバーシティーはいま 「誰一人取り残さない」という理念を掲げる国連の「持続可能な開発目標（Sustainable Development Goals、SDGs）」。その実現のため、異なる特徴や特性を持つ者がともに存在する状態を指す「ダイバーシティー（多様性）」が大切なキーワードになっています。人権尊重の視点とともに“多様性がある方がより良いアイデアや解決策が生まれ、社会が強くなる”という考えから、組織やコミュニティーづくり、働き方、文化、生態系など、さまざまな分野で語られています。 2019年から発行している「Science Window」SDGs特集号では、SDGs達成に向けた科学技術の担い手たちの未来ビジョンや取り組みを紹介してきました。今回はジェンダー、国籍、障がい、地域など、さまざまな多様性に着目し、その取り組みや担い手たちの声を盛り込みました。社会や科学技術の世界のダイバーシティーについて、一緒に考えてみましょう。 【目次】 イノベーション加速の原動力に 《行木陽子さんインタビュー》 一人の高校生の願いから生まれた「だれでもピアノ」 《新井鴎子さんインタビュー》 障がい者の埋もれた能力を掘り起こそう ジェンダー平等がもたらすより良い社会 《佐々木成江さんインタビュー》 燃料デブリの取り出しに挑む 《岩渕美咲さんインタビュー》 ポジティブな出産、適切な情報提供が後押し 世界で学んだコンビ、水中ドローンを開発 雨水をもっと暮らしに活かそう 世界を舞台に、今後の活躍を期待 《羽ばたく女性研究者賞の受賞者に聞く》 「STI for SDGs」アワード2022 受賞取組一覧

• [2022年夏号] ダイバーシティーで目指すもの  Newspaper, magazine

  科学技術振興機構  サイエンスウィンドウ  Chapter 5 世界で学んだコンビ、 水中ドローンを開発  2022.10

  Author： Other 

  　View Summary

  【特集】ダイバーシティーで目指すもの 私たちは未来に向け、さまざまな課題を克服しながら歩む必要があります。世の中のあらゆる人々が加わり、互いを尊重し、多様な視点を活かすことは、豊かな社会を築いていく新しい活力になりそうです。 【目次】 CHAPTER 01 イノベーション加速の原動力に《行木陽子さんインタビュー》 CHAPTER 02 障がい者の埋もれた能力を掘り起こそう CHAPTER 03 ポジティブな出産、適切な情報提供が後押し CHAPTER 04 人と生き物の関係を問い直す CHAPTER 05 世界で学んだコンビ、水中ドローンを開発 COLUMN 企業のダイバーシティー&インクルージョンを評価―独自指数で「何をすれば良いか」に挑むアワード―