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Front-line Researchers
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 Tomohiro Nakatani, Senior Distinguished Researcher, NTT Communication Science Laboratories
Abstract
Automatic-speech-recognition technology has developed rapidly and is now commonly used in voice interfaces such as those of smartphones and smart speakers; however, the technology must be further improved to enable smooth interaction between computers and humans. Tomohiro Nakatani, a senior distinguished researcher at NTT Communication Science Laboratories, has been at the forefront of research regarding speech enhancement, which removes ambient noise and reverberation from various sounds and accurately extracts only the sound that the person wants to hear. We asked him about the progress of his research and attitude as a leading researcher.
Rising Researchers
- Yoshihiro Ogiso, Distinguished Researcher, NTT Device Innovation Center/NTT Device Technology Laboratories
Abstract
With the proliferation of the Internet of Things and the launch of fifth-generation mobile communication system services, there is a demand for the optical communication networks that support these services to be even faster. In this article, we speak to Distinguished Researcher Yoshihiro Ogiso, who is researching Mach-Zehnder electro-optic modulators: the end points of fiber-optic communication that contribute significantly to higher speed.
Feature Articles: Technology Development for Achieving the Digital Twin Computing Initiative
- The World Made Possible by IOWN Digital Twin Computing
Abstract
Digital Twin Computing (DTC) to achieve future forecasting and optimization by linking the real and digital worlds is now being researched and developed as one of the main pillars of the Innovative Optical and Wireless Network (IOWN) vision targeted by NTT. This article introduces the world under DTC and four grand challenges in making DTC a reality.
- Studies on Skill Level and Dialogue Satisfaction for Achieving Mind-to-Mind Communications Technology
Abstract
We have undertaken the development of mind-to-mind communications technology to enable a uniform means of communication that can be mutually understood by all humans. As the first step in this effort, we focused on (1) how to convey information tailored to the other person by studying technologies for presenting information tailored to work skills and (2) how to evaluate communication by evaluating and estimating satisfaction on the basis of positivity and impact of a dialogue participant. As the next step, we will refine the technologies presented in this article to improve understanding of utterance intention through expressions that match one another”Ēs sensitivities.
- Technologies for Achieving Another Me
Abstract
“Another Me,” a grand challenge of Digital Twin Computing announced by NTT in 2020, aims to achieve the existence as a person’s alter ego that appears to have the same intelligence and personality as an actual human and is recognized and active in society as that person. As the first step in achieving this, we constructed a digital twin that acts like the represented person and is capable of asking questions in line with the viewpoints held by that person. This article describes in detail the main technologies behind Another Me, namely, question-generation technology, body-motion-generation technology, and dialogue-video-summarization technology.
- Initiatives toward Development of the Exploring Engine for the Future Society
Abstract
This article introduces the “Exploring Engine for the Future Society,” one of the grand challenges toward actualizing the Digital Twin Computing concept and outlines its architecture and three key technologies.
- Coupled Simulation Technology for Visualizing Environmental and Economic Social Cycles
Abstract
Maintaining sustainability of human society in harmony with the environment into the future is regarded as the most-important issue on Earth. Accordingly, the NTT Digital Twin Computing Research Center is taking up the grand challenge of inducing inclusive equilibrium solutions for the Earth and its social and economic systems by making the interrelationships between them as computable as possible. Our efforts to meet this challenge are described in this article.
Regular Articles
- Experimental Evaluation of High-capacity Wireless Transmission Using Orbital Angular Momentum Multiplexing Technology
Abstract
We are researching and developing technology to achieve terabit-class wireless transmission toward six-generation wireless systems. In this article, we present experimental evaluations of high-capacity wireless transmission using orbital angular momentum (OAM) multiplexing on a 40-GHz frequency band with a bandwidth of 1.5 GHz at distances of 100 and 200 m. Our OAM antennas have two uniform circular arrays (UCAs) with the same diameter using different linear polarizations and Butler matrices, which are analog devices for generating and separating OAM modes. OAM beams are generated using a Butler matrix, which is an analog radio-frequency circuit, and radiated from the UCAs. We implemented an OAM multiplexing transmitter (Tx) and receiver (Rx) on the 40-GHz band. The Tx and Rx can generate and separate seven OAM modes (0, ±1, ±2, ±3) and two polarizations (vertical and horizontal), which is a total of 15 streams including the center antenna element to transmit OAM mode 0. Each channel carries a 1.5-Gbaud signal. We experimentally evaluated the transmission capacity at distances of 100 and 200 m. The results indicate successful wireless data transmission of 137 Gbit/s at a distance of 100 m and 117 Gbit/s at a distance of 200 m.
Global Standardization Activities
- Recent Standardization Activities in ITU-R SG 3
Abstract
When considering new frequency allocation and transmission technology, it is essential to standardize the radio-wave propagation model. This article reports on the latest trends in ITU-R (International Telecommunication Union - Radiocommunication Sector) Study Group 3, an international standardization organization for radio-wave propagation models led by the author and his colleagues as the representative of the NTT Group.
External Awards/Papers Published in Technical Journals and Conference Proceedings
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