ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
Search
Advanced search
OR
Browse
Search
40.04 Broadcasting and Communication Technologies(BCT)
Displaying 1-22 of 22 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (10K)
  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (65K)
  • Reducing Influence of Impulsive Noise in OFDM Systems
    Hirotomo YASUI, Akira NAKAMURA, Makoto ITAMI
    Article type: Article
    Session ID: BCT2016-17
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    In OFDM system, one of the main problems is impulsive noise. All sub-carriers of OFDM symbol are influenced by the impulsive noise because it has very large magnitude and short time duration. Therefore, it is necessary to reduce the influence of the impulsive noise in the receiver. In the mitigation scheme, purpose of time sample replacement scheme is to replace the sample influenced by impulsive noise with re-generated sample. However, the performance of this scheme is degraded in higher order modulation such as 64QAM. In this paper, proposed scheme can achieve more BER performance than the conventional schemes.
    View full abstract
    Download PDF (540K)
  • Evaluation of energy absorption by the body exposed to EM waves from a wireless radio terminal in VHF band
    Ryota Akiyama, Kazuyuki Saito, Soichi Watanabe, Koichi Ito
    Article type: Article
    Session ID: BCT2016-18
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Recently, various types of radio communication devices such as cellular phones have become common. Therefore, influence with the electromagnetic wave emitted from these equipment is widely concerned. In particular, Absorbed EM energy in the human body mainly imparts a thermal effect to tissues. The specific absorption rate (SAR) is used as the standard dosimetric parameter for international safety guidelines for radio frequency exposures. In this report, a normal mode helical antenna (NHA) with metallic case was modeled realistically. Moreover, SAR due to a transceiver in very high frequency (VHF) band, which are used in relay broadcasting, program producers etc., is investigated. As a result of calculations, possibilities of increasing the SAR were observed. However, all calculated SARs were below the international safety guidelines.
    View full abstract
    Download PDF (10405K)
  • A Study on OFDM Transmission Systems with Waveform-Selective Metasurfaces
    Daisuke Anzai, Hiroki Wakatsuchi
    Article type: Article
    Session ID: BCT2016-19
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Waveform-selective metasurfaces can potentially solve a long-lasting problem in available radio frequency resources, which are limited by a growing demand on wireless communications. In this paper, we investigate wireless communication systems based on orthogonal frequency division multiplexing (OFDM) to make use of the waveform selectivity. Our computer simulation results demonstrate a possibility that the waveform-selective matasurface-based wireless communication system allows us to effectively share even the same frequency resource by assigning different pulse widths.
    View full abstract
    Download PDF (513K)
  • Field Experiment on User Collaboration for MIMO Systems
    Ou ZHAO, Xiaoliang SHI, Hidekazu MURATA
    Article type: Article
    Session ID: BCT2016-20
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Collaborative communication working on user side have been identified as one of key technologies for next-generation networks and so that lead to dramatic improvements in both spectral and energy efficiencies. In this technology, multiple collaborative users (CUs) can be considered as a single user equipped with multiple antennas and maximize the performances of multiple-input multiple-output (MIMO) systems, only noting an assumption that the links between all of CUs are perfect. In fact, however, the unsuccessful data sharing between CUs due to, for instance, the presence of interference, may lead to packet errors, and finally decreases the number of collaborated users and further degrades the performance of MIMO systems. In the present study, in order to demonstrate and evaluate the user collaboration, we conduct field experiments to observe the states of inter-user links in MIMO systems with collaborative communications and considering the effect of interference. Experiment results indicate that the links between the CUs are not always prefect, and are significantly affected by the present interference. The results also show some state correlation on the inter-user links.
    View full abstract
    Download PDF (3786K)
  • An Antenna Selection Scheme for QRM-MLD Receivers Based on Error Rate Minimization
    Ilmiawan SHUBHI, Hidekazu MURATA
    Article type: Article
    Session ID: BCT2016-21
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Multiple-input multiple-output (MIMO) systems have became one of the key elements in wireless communication technologies. To capture its most advantages, antenna selection can be implemented to select only a certain number of antennas from a larger number of available antennas. This antenna selection, however, should be tailored based on the detection algorithm used in the system. In this paper, an antenna selection scheme for a MIMO system which uses QRM-MLD receivers is proposed. Numerical results obtained through computer simulations show that the proposed scheme is able to provide a near optimum performance in terms of bit error rate (BER). In addition, the proposed scheme is feasible owing to its moderate computational complexity.
    View full abstract
    Download PDF (488K)
  • Compressed Sensing based Channel Impulse Response Estimation for Space Time Block Coding Single Frequency Network in DTV System
    Ryan PADERNA, Duong Quang THANG, Yafei HOU, Takeshi HIGASHINO, Minoru ...
    Article type: Article
    Session ID: BCT2016-22
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    This system uses a low complexity channel estimation for Space Time Coding in a Single Frequency Network Digital Terrestrial Television System. The receiver employs a MIMO system with vertical and horizontal antennas. The channel estimator uses a compressed sensing in time domain which exploits the sparsity of the channel impulse response. The algorithm for estimating the delay and channel gain is Orthogonal Matching Pursuit (OMP). The BER performance shows that OMP is very close to the ideal channel estimation. In addition, the OMP performance outperforms the linear interpolation method.
    View full abstract
    Download PDF (381K)
  • Considerations of Path Loss and Channel Modeling through Different Floors in an Office Environment for a Wireless LAN System
    Atsushi KYOYA, Manabu OMIYA
    Article type: Article
    Session ID: BCT2016-23
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Spreading to use mobile terminals such as a laptop PC, a tablet and a smart phone, wireless LAN systems are introduced at various places. It is essential to understand indoor radio wave propagation for the efficient operation and appropriately predicting the number and setting places of mobile communication systems including access points of wireless LAN system. Conventionally experiments and measurements have been carried out to predict characteristics of indoor radio wave propagation. On the other hand, numerical simulations can support propagation characterizations in numerous communication environments and lead to many new discoveries related to them. This paper reports the measurement results related to indoor radio wave propagation characteristics such as path loss and propagation channel between the plural floors for the wireless LAN system. The study aims to predicting indoor propagation properties and propagation channels precisely by numerical simulations. To collect fundamental data for developing a numerical model that is effective for computer simulations, properties of path loss between the plural floors are considered in detail.
    View full abstract
    Download PDF (5231K)
  • Compressed Sensing Based Channel Estimation in ISDB-T System without Cyclic Prefix
    Rian FERDIAN, Yafei HOU, minoru OKADA
    Article type: Article
    Session ID: BCT2016-24
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Integrated Service Digital Broadcasting Terrestrial (ISDB-T) transmission system is based on OFDM technique which requires cyclic prefix (CP) and pilot tones for channel estimation. Beside data sub-carriers, the usage of CP and pilot tones occupies the ISDB-T bandwidth up to 25%. However, CP is required to mitigate the inter-symbol interference (ISI) and interblock interference (IBI) and pilot tones are required to estimate the channel response information in order to equalize the multipath effect. Recently, a wireless communication scheme without CP by using chained turbo of equalization (CHATUE) technique was proposed. Furthermore, in term of channel estimation, compressed sensing (CS) has become a prominent technique that offers better performance with less pilot tones. In this paper, we proposed a channel estimation scheme for ISDB-T system without CP using CS technique. The pilot tones are inserted at several lowest value intersections location in the previous and post symbol interferences. The final result provides an ISDB-T system with more than 90% spectrum efficiency.
    View full abstract
    Download PDF (3726K)
  • A Centralized Interference Alignment (IA) Design for Multi-User MIMO Interference Channels
    Fereidoun H. Panahi, Tomoaki Ohtsuki, Wenjie Jiang, Yasushi Takatori, ...
    Article type: Article
    Session ID: BCT2016-25
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Interference alignment (IA) is a technique shown to be able to achieve a significant overall throughput in a K-user multiple-input multiple-output (MIMO) interference channel (IC). In this paper, we try to modify the conventional IA designs to achieve enhanced sum-rate performance. We jointly design transmit and receive IA filters (precoding and suppression filters) at a central unit (CU) to reduce the channel state information (CSI) feedback/sharing overhead. At the CU, in a one-way iterative strategy (left 'L' to right 'R') see Fig. 1), the precoding filters are optimized (on side 'L') in the direction of the gradient of the sum-rate, and the suppression filters are chosen (on side 'R') to minimize the leakage interferences. Then, in a two-way iterative strategy, the proposed scheme alternates between 'L' and 'R' sides to design the IA filters through the joint sum-rate maximization and interference leakage minimization on each side. Finally, a modified version of the two-way iterative strategy is proposed to design the IA filters on the basis of signal-to-interference-plus-noise ratio (SINR) (instead of the interference minimization) and the sum-rate maximization techniques.
    View full abstract
    Download PDF (713K)
  • A Consideration of Optical Repeater for Next Generation Digital Terrestrial Broadcasting Signal Using Radio over Fiber
    Kazuma NISHIYASU, Yuya KANEKO, Takeshi HIGASHINO, Minoru OKADA
    Article type: Article
    Session ID: BCT2016-26
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    In the next generation digital terrestrial, the QAM (Quadrature Amplitude Modulation) with high number modulation and multiple antenna technique are considered to increase data rate without frequency bandwidth from current assignment. Meanwhile, the gap filler equipment are introduced for repeating digital terrestrial broadcasting signal to solve radio dead zone, such as underground city. This article considers the system configuration for repeating the next generation digital terrestrial broadcasting signal without modifying current relaying architecture.
    View full abstract
    Download PDF (618K)
  • Improving Performance of Dual-Polarized MIMO Ultra-Multilevel OFDM under Mobile Reception
    Hiroaki OTSUBO, Akira NAKAMURA, Makoto ITAMI
    Article type: Article
    Session ID: BCT2016-27
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_41
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Dual-polarized MIMO and ultra-multilevel OFDM is proposed for next-generation digital terrestrial broadcasting. In mobile reception of OFDM signal, inter-carrier interference (ICI) is generated by Doppler-spread. The reception characteristics are deteriorated by ICI, the improving scheme of reception characteristics is necessary. In the MIMO-ICI canceller with complexity reduction, iterative detection is adopted to improve reception characteristics. MIMO-ICI canceller using iterative detection can improve the reception characteristics with complexity reduction. In this paper, the reception characteristics are improved by MIMO-ICI canceller using iterative detection for dual-polarized MIMO ultra-multilevel OFDM under mobile reception.
    View full abstract
    Download PDF (535K)
  • Long-Haul Transmission Experiments of a Microwave Link System for Super Hi-Vision
    Hirokazu KAMODA, Takashi KUMAGAI, Tomofumi KOYAMA, Satoshi OKABE, Kazu ...
    Article type: Article
    Session ID: BCT2016-28
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    We are developing an FPU (Field Pick-up Unit) or microwave link that can transmit SHV (Super Hi-Vision) signals for program contribution towards the rollout of SHV broadcasting. The goal is to achieve 200-Mbps-class data rate within the same channel bandwidth as that for the currently used Hi-Vision FPU. To increase the data rate, an ultra-multilevel OFDM (Orthogonal Frequency Division Multiplexing) and a dual-polarized MIMO (Multiple-Input Multiple-Output) technologies are introduced. LDPC (Low Density Parity Check) codes are employed to suppress the significant increase in the required carrier-to-noise ratio due to the ultra-multilevel modulation. This paper describes the fabrication of an SHV-FPU with above technologies implemented and the long-haul (more than 50 km) transmission experiments. As a result of the experiments, SHV signals were successfully transmitted as expected and little degradation of cross polarization discrimination was observed even through the long propagation.
    View full abstract
    Download PDF (683K)
  • Development of Complexity-reduced 4×4 MIMO-MLD Demodulator with Block QR Decomposition
    Fumito ITO, Takayuki NAKAGAWA, Hiroyuki HAMAZUMI, Kazuhiko FUKAWA
    Article type: Article
    Session ID: BCT2016-29
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_49
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The authors have been researching large capacity transmission technology using 4×4 MIMO scheme to develop SHV wireless cameras. As the number of transmitting antennas increases such as a 4×4 MIMO system, the complexity of signal detection by MLD, which is the best technique to achieve low BER performance, becomes large exponentially. To solve this difficulty, we have proposed the complexity-reduced MLD using Block QR decomposition. In this report, we developed an experimental system of 4×4 MIMO-QPSK demodulator using proposed technique and evaluated the effectiveness of complexity reduction and the BER performance. From the result, we succeeded in developing the 4×4 MIMO-QPSK demodulator which reduces multiplications to 54 % and additions-subtractions to 56 % compared with conventional MLD, achieving the BER performance degraded by 1 dB from the result of computer simulation.
    View full abstract
    Download PDF (581K)
  • A Study of SC-FDE on Millimeter-wave band Transmission System : Toward the Realization of 8K Super Hi-Vision Wireless Camera
    Yoshifumi MATSUSAKI, Takayuki NAKAGAWA, Hiroyuki HAMAZUMI
    Article type: Article
    Session ID: BCT2016-30
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_53
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The authors have been studying on single-carrier transmission with frequency domain equalization (SC-FDE) for 8K Super Hi-Vision millimeter-wave band wireless cameras, where compactness and power-efficiency are required. In this report, applying 32-QAM (Quadrature Amplitude Modulation) and 32-APSK (Amplitude Phase Shift Keying), the deterioration through a millimeter-wave power amplifier and the transmission performance with forward error correction were simulated. As a result, compared with Orthogonal Frequency Division Multiplexing (OFDM), it is showed that SC-FDE can gain large link margin in the link budget.
    View full abstract
    Download PDF (592K)
  • Wireless Transmission Technologies on Television Program Contribution for 8K Super Hi-Vision
    Hiroyuki HAMAZUMI
    Article type: Article
    Session ID: BCT2016-31
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_57
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Research and development of Super Hi-Vision has been promoted towards the next generation broadcasting to deliver the sense of presence which exceeds high definition television system. Wireless transmission system for transmitting program material of Super Hi-Vision is required in the field of the program production, such as the "live" broadcast. This report describes an overview of the wireless link systems to transmit broadcast program material for 8K Super High-Vision.
    View full abstract
    Download PDF (13626K)
  • Research and Development of V-High Multimedia Broadcasting Technologies
    Tomoyuki Ohya
    Article type: Article
    Session ID: BCT2016-32
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_63
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The V-High multimedia broadcasting NOTTV service will be terminated as of the end of June, 2016, after about 4 years operation since April 1^<st>, 2012. For providing new broadcasting service targeting smart phone devices, we have been developing various technologies, such as, the higher resolution video service compare to One seg, file based broadcasting service, new CAS (Conditional Access System) service for mobile receivers, full featured meta data services, touch panel aware data broadcasting, etc. This paper reviews how these V-High multimedia broadcasting technologies are designed and have been utilized in the actual services.
    View full abstract
    Download PDF (12988K)
  • Research and Development on Receiving Antenna and Distribution Equipment for UHDTV Satellite Broadcasting
    Masafumi NAGASAKA
    Article type: Article
    Session ID: BCT2016-33
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_67
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    A 12-GHz (11.7 to 12.75 GHz) band satellite service with dual-circular polarization is being studied for transmission channels to deliver Ultra High Defmition Television (UHDTV) broadcasting services. To carry the received signals, which are provided with right- and left- hand circular polarizations, on a single coaxial cable simultaneously, the signal provided with the left hand circular polarization has to be converted to the frequency higher than the intermediate frequency currently used (1032.23 to 2070.25 MHz). We evaluated the characteristics of the distribution equipment to study the technical problem of distribution systems for the satellite broadcasting reception. We also fabricated and tested a right- and left-circular polarized parabolic reflector antenna because the dual-polarization receiving antenna will make it possible to receive services provided over these polarizations with a single reflector antenna, reducing the installation costs of the receiving system. ARIB Standard STD-B63 defined the intermediate frequency for the signals with left-circular polarization (2224.41 to 3223.25 MHz) in March 2015. Therefore, we fabricated and measured the dual-polarization receiving antenna in accordance with the specifications of the standard, considering the feasibility of the mass production. The measured results showed that the aperture efficiency was more than 74 %, the cross polarization discrimination was more than 26 dB and the noise figure of the converter was less than 1 dB throughout the 12-GHz band. The radiation pattern of the fabricated antenna also complied with the reference pattern of ARIB Standard STD-B63.
    View full abstract
    Download PDF (19394K)
  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (82K)
  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (82K)
  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: February 11, 2016
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.40.4.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (82K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top