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1991 Fiscal Year Final Research Report Summary

Development of in-service measurement equipment of multipath delay time for-high rate TDMA mobile communication

Research Project

Project/Area Number 02555066
Research Category

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

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

Principal Investigator

YOSHIDA Susumu  Kyoto University, Faculty of Engineering, Professor, 工学部, 教授 (50026324)

Co-Investigator(Kenkyū-buntansha) TAKEUCHI Tsutomu  Kyoto University, Faculty of Engineering, Instructor, 工学部, 助手 (20154974)
Project Period (FY) 1990 – 1991
KeywordsDigital communication / Mobile communication / Multipath fading / Multipath delay spread / Co-channel interference
Research Abstract

Multipath propagation with large delay time difference causes severe bit-error-rate degradation of high bit-rate mobile radio communications system. Thus, the measurement of multipath delay time is very important to estimate the transmission quality. However, it has been generally very difficult to measure multipath delay time. Transmission of a broadband pseudo-random noise sequence and reception by sliding correlation technique are generally used to measure multipath delay profile. This makes the measurement of delay time to be costly and timeconsuming.
In this research, we developed a very simple, yet convenient in-service multipath delay spread measurement equipment for high-rate digital mobile communication. The major results are summarized as follows :
1. (1) By simply measuring a quadrature channel detector output of a differential detector for a BPSK signal, delay spread can be estimated.
2. (1) By simply measuring the difference between magnitudes of in-phase channel and quadrature channel detector outputs for a pi/4-shifted QPSK signal, delay spread can be estimated.
3. Both measurement circuits were shown to be implemented very easily.
4. For both cases, measured outputs were shown to well-correspond to the bit-error-rate performance.
5. Co-channel interference or carrier-to- interference ratio (C/I) is also found to be measured by the same circuits. This is especially useful as a criterion of decision making for intrand inter-cell handoff.
6. Even when multipath delay spread and co- channel interference co-exist, still the measured output was confirmed to be a good measure of bit-error-rate performance.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Hong Zhou: "Selection diversity reception based on cross-channel-interference measurement for digital mobile radio" Transactions of IEICE. E73. 658-664 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Byong Jin Cho: "A simple multipath delay time detection method for π/4 shift QPSK in digital mobile/portable communications" Proc.IEEE Vehicular Technology Conference,St.Louis(VTC'91). 7-12 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Yoshida: "Simple method of multipath delay difference detection for π/4-shift QPSK" Electronics Letters. 27. 1027-1028 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平井 淳生: "π/4シフトQPSK用簡易多重波遅延時間検出装置の試作" 電子情報通信学会技術研究報告RCS91ー14. 91. 53-59 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Yoshida: "In-service monitoring of multipath delay-spread and C/I for QPSK signal" Proc.IEEE Vehicular Technology Conference,Denver(VTC'92). (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Atsuo Hirai: "Convenient co-channel interference detection methods for digital cellular radio" Proc. International Symposium on Antennas and Propagation,Sapporo. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hong Zhou: "Selection diversity reception based on cross-channel-interference measurement for digital mobile radio" Transaction of Institute of Electronics, Information and Communication Engineers. E73. 658-664 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tadashi Nakamura: "A detection method of delayed multipath signal for QPSK signal" Proceedings of Spring National Convention of IEICE. 2-405 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Byong Jin Cho: "A simple multipath delay time detection method for pi/4 shift QPSK in digital mobile/portable communications" Proc. IEEE Vehicular Technology Conference (VTC'91). 7-12 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Susumu Yoshida: "Simple method of multipath delay difference detection for pi/4-shift QPSK" Electronics Letters. 27. 1027-1028 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Atsuo Hirai: "A simple multipath delay detector for pi/4-shift QPSK" Papers of Tech. Group on RCS, IEICE, 91. 71-77 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Atsuo Hirai: "In-service detection of co-channel interference for pi/4-shift QPSK" Papers of Tech. Group on RCS, IEICE, 91. 7-12 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kouji Yoshimoto: "Detection of C/I by measuring quadrature-channel detector output for BPSK" Proceedings of Spring National Convention of IEICE. 2-376 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Susumu Yoshida: "In-service monitoring of multipath delay-spread and C/I for QPSK signal" IEEE Vehicular Technology Conference, Denver. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Atsuo Hirai: "Convenient co-channel interference detection methods for digital cellular radio" International Symposium on Antennas and Propagation, Sapporo. (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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