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Basic Study on Radio Propagation Structure of Nountain Reelection in Digital Mobile Radio Communication

Research Project

Project/Area Number 02452151
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 電子通信系統工学
Research InstitutionTakushoku University

Principal Investigator

IKEGAMI Fumio  Takushoku University, Faculty of Engineering, Professor, 工学部, 教授 (20093180)

Co-Investigator(Kenkyū-buntansha) KITANK Yasushi  Takushoku University, Faculty of Engineering, Research Assosiate, 工学部, 助手
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1991: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1990: ¥3,300,000 (Direct Cost: ¥3,300,000)
KeywordsDigital mobile radio / Multipath propagation / Multipath delay time / Mountain refrection / Theory / Measurement / 移動通信 / 周波数相関 / 建物回折損失
Research Abstract

In digital mobile radio, delayed multipath waves cause serious degradation in error rates. Reflection by mountains can produce very long delay which influences the system performance. However, there has been no way of predicting the strength of mountain reflection. Our study aimes to clarify the fundamental characteristics of mountain-reflected signals and how to predict the strength of the signals reflected by a mountain.
Measurements of mountain-reflection have been made at 1.2GHz on the campus of Takushoku University, using directive antennas directed to a part of a mountain. The mountain-reflected signal was seperated by a sharp pulse inserted in a TV signal, and received pulse pattern was observed on CRT display and recorded and processed by a computer to give the receiver input signal level of the reflected signal component.
In parallel, theoretical analysis was made to calculate the reflected signal strength taking a reflecting mountain as an absorbing scattering plane. The absorption factor at a mountain surface can be calculated from the measured reflected signal strength. According to the measurement, the wave attenuation due to absorption is obtained to be about 26.5dB in this case. In the measurements, the reflected signal strength was observed to vary with time. For example, the reflection increased by several dB in a few hours after snowfall, and also rapid fluctuation was eventually observed.
As the results, a method of theoretical prediction of the mountain-reflected signal strength has been proposed for arbitrary propagation conditions, if the absorption attenuation of radio wave by the reflecting mountain surface is known. Further studies are necessary to prove the validity of the fundamental equation and the value of absorption factor for more generalized environments.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] S.Yoshida: "High Bit-Rate Field Transmission of an Anti-Multipath Modulation Technique PKS-RZ" Proc.IEEE Vehicular Technology Conference,Orlando,Florida.May. 527-532 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉田 進: "耐多重波変復調方式について" 電子情報通信学会論文誌. J73ーBーII. 668-674 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹内 勉: "身街地多重波遅延プロフィ-ルの理論的予測法の基礎検討" 電子情報通信学会論文誌. J73ーBーII. 779-785 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] F.Ikegami: "Theoretical Prediction of Mean Field Strength for Urban Mobil Radio." IEEE Trans.on Antennas and Propagation.39-No3. 299-302 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Trisila Heru Laksono: "小セル移動通信の平均電解強度の理論的予測の研究" 電子情報通信学会技術研究報告. AP92. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 前山 利幸: "移動通信における山岳反射波強度の基礎的研究" 電子情報通信学会技術研究報告. AP92. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. YOSHIDA, F. IKEGAMI and T. TAKEUCHI: ""High Bit-Rate Field Transmission of an Anti-Multipath Modulation Technique PSK-RZ"" Proc. IEEE Vehicular Technology Conference. Orlando, Florida. 527-532 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. YOSHIDA and F. IKEGAMI: ""On Anti-Multipath Modulation/Demodulation Techniques"" IEICE Transactions on Communications. J73B-II, No. 11. 668-674 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. TAKEUCHI, T. HANO, F. IKEGAMI and S. YOSHIDA,: ""A Feasibility Study on Theoretical Prediction of Multipath Delay Profiles in Urban Mobile Radio Environments"" IEICE Transactions on Communications. J73B-II, No. 11. 779-785 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] F. IKEGAMI, S. YOSHIDA and T. TAKEUSHI,: ""Theoretical Prediction of Mean Field Strength for Urban Mobile Radio"" IEEE Trans. on Antennas and Propagation. 39, No. 3. 299-302 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] TRISILA H. L, F. IKEGAMI and Y. KITANO,: ""A Study on Theoretical Prediction of Mean Field Strength in Small-Cell Mobile Radio Communication"" IEICE Technical Report. AP. 92. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. MAEYAMA, F. IKEGAMI and Y. KITANO,: ""A Fundamental Stydy on Mountain-Reflected Signal Strength in Mobile Radio Communication"" IEICE Technical Report. AP. 92. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.Yoshida: "High Bit-Rate Field Transmission of an Anti-Multipath Modulation Technique PKS-RZ" Proc.IEEE Vehicular Technology Conference,Orlando,Florida.May. 527-532 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 進: "耐多重波変復調方式について" 電子情報通信学会論文誌. J73ーBーII. 668-674 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹内 勉: "市街地多重波遅延プロフィ-ルの理論的予測法の基礎検討" 電子情報通信学会論文誌. J73ーBーII. 779-785 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] F.Ikegami: "Theoretical Prediction of Mean Field Strength for Urban Mobile Radio." IEEE Trans.on Antennas and Propagation. 39-No3. 299-302 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Trisila Heru Laksono: "小セル移動通信の平均電解強度の理論的予測の研究" 電子情報通信学会技術研究報告. AP92. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 前山 利幸: "移動通信における山岳反射波強度の基礎的研究" 電子情報通信学会技術研究報告. AP92. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 池上 文夫: "移動通信の将来を展望する" ITU研究,日本ITU協会. No.220. 1-50 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] F.IKEGAMI: "A System Consideration of Digital Mobile Radio in Multipath Propagated Environments." Abstracts of XXIII General Assembly of the International Union of Radio Science(URSI),Prague,Czechoslovakia.2. 423-423 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Yoshida: "High BitーRate Field Transmission of an AntiーMultipath Modulation Technique PSKーRZ." Proc.of the 40th IEEE Vehicular Technology Conference,Orlando,Florida.May. 527-532 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 竹内 勉: "市街地多重波遅延プロフィ-ルの理論的予測法の基礎検討" 電子情報通信学会論文誌. J73ーBーII. 779-785 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 池上 文夫: "移動通信の裏表" 電気学会雑誌. 110. 1017-1023 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] F.Ikegami: "Theoretical Prediction of Mean Field Strength for Urban Mobile Radio." IEEE Trans.Ant.& Propag.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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