ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
Search
Advanced search
OR
Browse
Search
22.27
Displaying 1-11 of 11 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (15K)
  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (39K)
  • A spiral ring antenna
    Hideyuki Nebiya, Nozomu Hasebe, Satoshi Nagasawa
    Article type: Article
    Pages 1-6
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    An antenna having a toroidal coil shape consisting of a fixed length wire is proposed. The antenna has a size of 1/15〜1/5 wavelength. In this paper the radiation characteristics are analyzed by the induced electromotive force method and the moment method. These results are compared with the experimental results. A fairly good agreement is obtained. We tried to establish empirical formulas as these results. For the limited size adopted in the paper, the antenna has a relatively high gain, and can be easily matched to a coaxial line.
    View full abstract
    Download PDF (536K)
  • An On-Board Unit for Infrared and Quasi-microwave DSRC
    Junichi Takahashi, Toshio Nagashima, Toshiyuki Sakamoto, Kohichi Abe
    Article type: Article
    Pages 7-12
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    DSRC (Dedicated Short Range Communication) for VICS (Vehicle Information and Communication System) in Japan is composed of infrared beacons which are located along urban road and quasi-microwave beacons which are located along expressway. Its service has started since April 1996. While passing through the different two types of DSRC zones, it is required to maintain interoperability for the navigation system. Furthermore, it is desired to be easy installation of OBU (On-Board Unit). A multimedia OBU which ensure to amoothly communicate with the different types of beacons by using coprocessing procedure has been developed. This OBU also enable to be easily installed to the vehicle by using the multiplexing technique that the different types of DSRC signals and DC power supply are multiplexed on an one coaxial cable which connects with a head unit and a control unit.
    View full abstract
    Download PDF (500K)
  • Analytical Study for transmission quality of 64QAM signal in optical CATV
    Kazuki Maeda, Susumu Morikura
    Article type: Article
    Pages 13-18
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    In hybrid optical SCM for CATV systems, carriers are modulated by video signals or digital data, so amplitude of a multiplexed signal of these modulation signals is compressed compared with that of the carriers themselves, and frequency of clipping of the multiplexed signal at the laser threshold is decreased. Consequently, BER of the M-QAM signal in the practical hybrid SCM is lower than that of the experimental results. In this paper, we describe BER analysis method that can effectively estimate the BER performance in the practical hybrid SCM by using representative profiles of the modulation signals. The BER of the M-QAM signal, when assuming FDM signal with modulation signals, extremely improved compared with the BER for multiplexed signal of carriers. Furthermore, BER degradations due to clipping can be neglected for the AM signals in setting practical optical modulation indexes. We also study effective OMI ranges of AM and M-QAM signal by using the analysis method. By assuming AM signal with black picture, the OMI range is enlarged and particularly, the OMIs of AM signal agreed with practically setting value in AM-SCM transmission. This OMI range is more practical than that of former studies.
    View full abstract
    Download PDF (734K)
  • Study on carrier interleaving techniques for OFDM systems and indoor transmission experiments
    Takashi Ookubo, Hiroshi Nogami, Sadao Tsuruga, Akio Yamamoto, Keizo Ni ...
    Article type: Article
    Pages 19-24
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    This paper discusses characteristics of the carrier interleavers for OFDM transmission systems through indoor hardware experiments. The carrier interleavings considered here are : i) group-interleaving, ii) carrier-interleaving within a group, and iii) two-stage interleaving (the combination of i) and ii)). We measured the required C/Ns (BER=2×10^<-4>) over two-path channels of D/U=10 dB with short (0.2μs) through long (25μs) delay times. The results show that the interleaving scheme and its parameters (the number of carriers per group) affect the required C/Ns. With suitable selection of the scheme, the interleaving gain can be about 2 dB or more. We also show the characteristic tendencies over multi-path channels with more than two-path are almost same as those in the two-path channels. Finally, we describe a few techniques for the frequency-domain equalizer and the Viterbi decoder so as to improve the transmission performance. Numerical examples show that improvement of 4 dB or more is realized by using CSI (channel state information) for the soft decision Viterbi Algorithm.
    View full abstract
    Download PDF (1084K)
  • [title in Japanese]
    Article type: Appendix
    Pages 25-
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (19K)
  • Activity Ratio of Cancer Cell due to Magnetic Field Irradiation
    Toshio Wakabayashi, Takahiro Fukazawa, Kyoji Ogoshi, Akemi Kamijyo
    Article type: Article
    Pages 27-32
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    It is important to consider a cancer therapy from both sides of thermal and non-thermal effects in order to find the total effect due to electromagnetic wave irradiation in it. We consider the therapy from the total effect due to magnetic field irradiation without side effect through experiments. Non-thermal, thermal and composite experiments are done to consider the effect. Activity ratios are shown in figures and discussed. Obtained results are useful for cancer therapy.
    View full abstract
    Download PDF (551K)
  • A Study on the Heating Characteristics of the Coaxial-Slot Antenna for Interstitial Microwave Hyperthermia
    Lira Hamada, Kazuyuki Saito, Koichi Ito
    Article type: Article
    Pages 33-38
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Today the medical applications of the microwaves are gaining popularity in various area of clinical treatment. The authors et al. have been studying on the characteristics of the coaxial-slot antenna for interstitial microwave hyperthermia. Although it is an invasive technique, the interstitial hyperthermia is considered to be effective to large volume and deep-seated tumors. In this report, some calculated results of the SAR (Specific Absorption Rate) patterns in the multi-layered media are displayed. Next, the temperature patterns inside the human body are calculated for effective treatment planning.
    View full abstract
    Download PDF (823K)
  • Study on the Phantom as a Human Model for Experimental Evaluation of Interaction between Human Body and Electromagnetic Fields
    Koichi ITO
    Article type: Article
    Pages 39-43
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_39
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Many different phantoms have proposed as the human head model for experimental estimation of the interaction between the human head and electromagnetic fields around. In this report, a solid phantom is introduced as the human head model realizing the same relative dielectric constant and conductivity as brain tissue. This brain-equivalent solid phantom makes it possible to accomplish highly reliable and precise estimation of specific absorption rate (SAR) in biological tissue. Brain-equivalent solid phantom models of cubes and spheres are fabricated. Measurements are performed to estimate the SAR in the human head models exposed to microwave sources by using the thermographic method.
    View full abstract
    Download PDF (729K)
  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: May 29, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.27.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (78K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top