IEICE ESS Fundamentals Review
Online ISSN : 1882-0875
ISSN-L : 1882-0875
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Volume 6, Issue 4
Displaying 1-19 of 19 articles from this issue
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Cover
Preface
Special Contribution
Review Papers
Proposed by WBS
  • Trends and Challenges of Using “White Space” in Wireless Communications
    Shigenobu SASAKI
    2013 Volume 6 Issue 4 Pages 250-256
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1587/essfr.6.250
    JOURNAL FREE ACCESS
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    This paper reviews the current trends and challenges regarding the use of “white space” in wireless communications, which is a freauency spectrum unused at a certain time and location. Regulatory issues related to the use of white space in the TV broadcast band (TV white space: TVWS) and standardization activities related to wireless communications in TVWS are described. the technical elements of cognitive radio incorporated in IEEE 802.22, which is the first IEEE standard for the use of TVWS, are reviewed. Finally, future problems to be solved to realize better use of the white space spectrum are also discussed.
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Proposed by MSS
  • Modeling Complex Processes
    -From Business Processes to Human Systems-
    Kunihiko HIRAISHI
    2013 Volume 6 Issue 4 Pages 257-264
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1587/essfr.6.257
    JOURNAL FREE ACCESS
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    Methods for describing business processes have been developed as a part of technologies for building enterprise information systems. Recently, these methods have been extended to handle complex processes including human activities, including the detailed modeling of medical processes to find potential failures in the processes. In this article, we clarify necessary functions for the modeling of human activities and then describe existing modeling methods.
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Proposed by EA
  • System Identification Problems on Acoustic Echo Cancellation
    - Nonlinear Extensions for Practical Problems -
    Suehiro SHIMAUCHI
    2013 Volume 6 Issue 4 Pages 265-275
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1587/essfr.6.265
    JOURNAL FREE ACCESS
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    System identification theory is now well established. However, its framework may still be modified or extended depending on actual applications. Acoustic echo cancelation is a reasonable field of application for system identification. In this paper, some recent results of extending the framework for acoustic echo cancelation are reviewed, in which nonlinearity is a keyword. To improve robustness during double-talk or noisy situations, some nonlinearly modified error cost functions have been introduced. To cancel distorted echo, nonlinear echo path modeling and its identification algorithms have been developed.
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Proposed by IMQ
  • Latest trends in Image Media Quality Assessment Technologies
    Jun OKAMOTO, Takanori HAYASHI
    2013 Volume 6 Issue 4 Pages 276-284
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1587/essfr.6.276
    JOURNAL FREE ACCESS
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    With the advances in image media coding technologies and broadband networks, video communication services have spread rapidly. It is important to design networks and systems prior to providing services and to manage quality when providing services in order to provide users with high-quality video communication services. To achieve this, methods are required to efficiently assess the user quality of experience (QoE). We describe typical subjective assessment methods and the latest objective assessment methods used for image media, and trends in international standardization in ITU/VQEG.
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Proposed by TL
Proposed by R
  • Degradation Analysis of Semiconductor Optical Devices and Suppression of Degradation
    Osamu UEDA
    2013 Volume 6 Issue 4 Pages 294-304
    Published: April 01, 2013
    Released on J-STAGE: April 01, 2013
    DOIhttps://doi.org/10.1587/essfr.6.294
    JOURNAL FREE ACCESS
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    Semiconductor optical devices, such as semiconductor lasers and light-emitting diodes (LEDs), employ a great variety of compound semiconductor materials and structures, and they are used in an extremely wide range of systems and electronic equipment in society, industry, and the home. These devices may degrade as a result of inappropriate bonding and packaging of the devices and under severe operating conditions, causing failure of the equipment and/or system. This paper systematically reviews various degradation modes of optical devices, mainly red and infrared optical devices, focusing on the degradation mechanism, degradation analysis, and methods of suppressing the degradation.
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