ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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41.11 Broadcasting and Communication Technologies(BCT)
Displaying 1-15 of 15 articles from this issue
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  • Broadcasting and Communication Technologies(BCT)
    Pages Cover1-
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Contents
    Pages Cover2-
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_Cover2
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Basic Study on Antenna System for Radio Wave Type Laparoscope
    Takuya MATORI, Takafumi FUJIMOTO, Naoto MASUDA, Toshiyuki TANAKA
    Session ID: BCT2017-39
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, the aim is to develop a radio wave type laparoscope that can project an image of the blood vessel in real time. The proposed system consists of one transmitting antenna and four receiving antennas. The position of the blood vessel is detected by signal-processing the received radio wave to image data by the method of processing synthetic aperture. The diameter of the practical laparoscope is usually 10mm. In this study, however, a system with a 25mmdiameter (a 2.5-times scale model) is designed in order to facilitate of the measurement. In the analytical model, the transmitting antenna and four receiving antennas are located on the top of the fat. Two arrangements of the transmitting antenna are investigated using the simulated reflection and transmission coefficients. The differences between the transmission coefficients in the cases with and without the blood vessel are observed.
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  • Basic Study on Rectenna for TV Broadcast Wave Energy Harvesting
    Jumpei MIIKE, Takafumi FUJIMOTO, Daiki HISATOMI, Yoichi ISHIZUKA, Tomo ...
    Session ID: BCT2017-40
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A rectenna for TV broadcast wave energy harvesting is investigated for wireless sensor network. Generally, rectenna is composed of an antenna and a rectifier. Input impedance of the designed rectifier is 314 + j0Ω. Since output impedance of an antenna is a 50Ω, matching circuit is necessary between an antenna and a rectifier. Matching circuit is downsized by a crank-shaped microstrip line and an L-shaped shorted stub. The prototype rectenna is directly connected to the output terminal of the high-frequency oscillator, and the input and output voltage are compared using an oscilloscope.
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  • Rainfall Prediction Using Particle Filter
    Kazuki OHARA, Minoru OKADA, Takeshi HIGASHINO
    Session ID: BCT2017-41
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In recent years localized heavy rain called guerilla heavy rain is a problem. .It is necessary to predict the occurrence of disasters caused by localized heavy rain in advance and minimize the damage by accurately grasping the situation. As one of countermeasures, phased array radars capable of measuring three dimensional raindrop distribution have been developed, and it is becoming possible to observe high temporal resolution and spatial resolution. However, the amount of data acquired by the phased array radar is enormous and it is not realistic to send the observed raw data to the required place. Therefore, in this report, we propose a method to drastically reduce rainfall data by modeling observed data with three dimensional volume model. By using this method, it is possible to transmit data on an inexpensive internet line with a transmission speed of about several [Mbps]. In addition, we propose a system that predicts transmitted data using a particle filter .. In the proposed system, a particle model is constructed by using the moving direction and increasing or decreasing direction of each rain clump in the three dimensional volume model as state vectors. In this paper, we evaluate the change of the prediction accuracy by the particle number and the time resolution of the particle filter.
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  • A Study on MIMO System with Adaptive Transmission Control for Next Generation Mobile Relay FPU
    Fumito ITO, Fumiki UZAWA, Kazuhiko MITSUYAMA, Naohiko IAI
    Session ID: BCT2017-42
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_13
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    The authors have been researching a 4x4 MIMO system with adaptive transmission control which changes beam-forming weights and modulation schemes in accordance with channel conditions. In this report, we evaluated a transmission performance over a time-varying channel model assuming live production of road races by computer simulations and compared results between the proposed system and conventional systems such as the SISO system described in ARIB STD-B33 and the STTC-MIMO system in STD-B57. The results show that our proposed system can achieve about 1.5 times larger transmission rate than that of conventional systems with the same S/N.
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  • A Study on Direction of Arrival Estimation System for Wide Band Digital Modulated Wave
    Atsushi IWASAKI, Masafumi NAGASAKA, Shoji TANAKA
    Session ID: BCT2017-43
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_17
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    We studied a direction-of-arrival estimation system using the intermediate frequency (IF) band of the satellite broadcasting, which is a wide band digital modulated wave. We constructed an experimental system that has two receiving antennas and a phase comparator in a radio anechoic chamber to evaluate the estimation accuracy. The estimation accuracy was evaluated by comparing the phase difference obtained from the receiving antennas, which were mounted on the turntable, and the phase difference estimated from the output signal of the phase comparator. As a result, we confirmed that the arrival direction of a wide band digital modulated wave can be estimated with our proposed system.
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  • Study on precise measurement of propagation variation using the Digital Terrestrial Television Broadcasting signal
    Hiroki OHTA
    Session ID: BCT2017-44
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For propagation measurement using the Digital Terrestrial Television Broadcasting, we construct a theoretical model of the transmission path from the broadcasting tower to the observation point. And we describe the extraction method of propagation variation using the features of OFDM signal. Then we discuss the measurement accuracy.
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  • Performance Improvement of IPDC Live Streaming Delivery System and Apply for Experiment in the Stadium
    Ken’ichirou SUZUKI, Katsunari KUMAKURA, Koki OIKAWA
    Session ID: BCT2017-45
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, we report the performance improvement result of IPDC live-streaming delivery system and apply for demonstration experiment in the soccer stadium. This system provides a live streaming service by sending MPEG-DASH segments with IPDC. We have achieved delay reduction for IPDC live streaming system by MPEG-DASH segment length shortening and optimization of a process at delivery server and client application. And we applied this system to smart stadium demonstration experiment and provide new experience to visitors.
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  • A study on the interleaver of partial reception toward the proposed specification of the next generation terrestrial broadcasting
    Hiroaki MIYASAKA, Akihiko SATO, Shingo ASAKURA, Takuya SHITOMI, Noriyu ...
    Session ID: BCT2017-46
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_29
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    NHK is conducting research on the next generation terrestrial broadcasting. The proposed specification for the next generation terrestrial broadcasting is incorporated the new signal structure and the latest technologies in order to get spectrum utilization efficiency higher than ISDB-T. Furthermore, the proposed specification has been designed based on segmented OFDM to transmit the signal for both a fixed reception service and a mobile reception service simultaneously in one channel. This system is able to provide mobile reception service by partial reception such as one-segment service of ISDB-T. Moreover, in order to improve the frequency interleaving effect, the partial reception bandwidth is expanded approximately 3.5 times compared to ISDB-T. This paper describes the frequency interleave method suitable for the expanded partial reception and the evaluation for mobile reception performance with several frequency interleave methods by computer simulations.
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  • Carrier Superposed Transmission for Satellite Communications －For development of LDM－
    Minoru OKADA
    Session ID: BCT2017-47
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In digital terrestrial television broadcasting, LDM (Layered Division Multiplex) has been studied for layered transmission as well as for maintaining the backward compatibility. On the other hand, the carrier-superposed transmission technique has been introduced in the satellite communication systems. The carrier-superposed transmission system is capable of transmitting two signals at the same frequency band. The major part of techniques in the carrier-superposed transmission systems such as interference canceller and the channel response estimator can be used for LDM. This report introduces the principles and problems of the carrier superposed transmission for supporting the research and development of LDM-based broadcasting system.
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  • Space-Time Block Coding in a Single Frequency Network with partial Layered Division Multiplexing for DTV Terrestrial System
    Ryan PADERNA, Yafei HOU, Minoru OKADA
    Session ID: BCT2017-48
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The 8K DTV system will be the next generation digital terrestrial broadcasting in Japan. However, the 8K DTV system does not have enough frequency spectrum resources because of ISDB-T (Integrated Services Digital Broadcasting Terrestrial) system occupancy. This paper proposed an interference canceller using Layered Division Multiplexing (LDM) for both ISDB-T system and 8K DTV system. Since both ISDB-T system and 8K system has common information to be transmitted, the proposed system only uses partial LDM to lessen the effect of interference. BER performance shows that the partial LDM has less error compared to full LDM.
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  • Theoretical analysis and simulation evaluation on Layered Division Multiplexing in the ATSC 3.0 standard
    Mikihiro OUCHI, Tomohiro KIMURA
    Session ID: BCT2017-49
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_41
    CONFERENCE PROCEEDINGS FREE ACCESS
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    LDM (Layered Division Multiplexing) was adopted in the ATSC 3.0 standard as the method to multiplexing the layers for stationary and mobile reception. This paper repots theoretical analysis and simulation evaluation results on LDM.
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  • LDM-BST-OFDM Transmission for Next Generation Terrestrial Television Broadcasting
    Takuya Fuse, Hiroaki Otsubo, Akira Nakamura, Makoto Itami
    Session ID: BCT2017-50
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this report, The combination of the LDM(Layered Division Multiplexing) scheme to the FDM(Frequency Division Multiplexing) scheme based BST-OFDM(Band Segmented OFDM) that is being studied as the preliminary specification toward the next generation digital terrestrial television transmission scheme is proposed in order to increase the frequency utilization in stationary reception of UHDTV(Ultra High Definition Television). The basic performance of the proposed scheme was evaluated by simulations under Gaussian channel and the improvement of the required CN ratio in UHDTV stationary reception was confirmed.
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  • Broadcasting and Communication Technologies(BCT)
    Pages 49-
    Published: 2021
    Released on J-STAGE: June 09, 2021
    DOIhttps://doi.org/10.11485/itetr.41.11.0_49
    CONFERENCE PROCEEDINGS FREE ACCESS
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