IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Volume 3, Issue 11
Displaying 1-2 of 2 articles from this issue
  • Zhichao Zhou, Yang Xiao, Dong Wang
    Article type: LETTER
    2014 Volume 3 Issue 11 Pages 324-329
    Published: 2014
    Released on J-STAGE: November 07, 2014
    Channel characteristic was not considered in the past stability researches of wired network. In this letter, we propose a wireless fluid model based on cross layers to describe the performance of wireless network. In the proposed model, active queue management in the wireless access point, abnormality of wireless channel and severe packets’ collisions are taken into consideration. The model enables us to analyze the wireless network with numerical approach and get an insightful understanding. Our results computed from the model show good agreement with these from simulations with network simulator.
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  • Hiroshi Sato, Yoshio Koyanagi, Koichi Ogawa, Masaharu Takahashi
    Article type: LETTER
    2014 Volume 3 Issue 11 Pages 330-334
    Published: 2014
    Released on J-STAGE: November 13, 2014
    MIMO techniques using multiple antennas for improving communication capacity per unit frequency have been introduced. However, when multiple antennas are arranged in close proximity, the throughput is reduced because of the strong coupling between antennas, which causes low antenna efficiency. In this paper, to solve this problem, we propose a new decoupling method that uses a branch shape element instead of a susceptance circuit between antennas. A two-element MIMO antenna array in close proximity that uses this proposed method is presented. The coupling value S12 and matching value S11 of the S-parameters can be obtained at less than −10 dB in this MIMO antenna array.
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