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An Application of Digital Filters to Spread Spectrum Communications

Research Project

Project/Area Number 13650410
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionShimane University

Principal Investigator

NISHIMURA Shotaro  Shimane University, Interdisciplinary Faculty of Science and Engineering, Professor, 総合理工学部, 教授 (50031092)

Co-Investigator(Kenkyū-buntansha) FUKUMA Shinji  Shimane University, Interdisciplinary Faculty of Science and Engineering, Assistant Professor, 総合理工学部, 助手 (50313565)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsAdaptive Digital Filter / IIR Notch Filter / Gradient Method / Spread Spectrum Communication / Narrow-Band Interference Rejection / Bit Error Rate / Region of Interest Image Coding / Optimum Bit Rate Allocation / 定常特性 / PN系列
Research Abstract

1. We proposed a method to analyze the steady-state performance of a complex coefficient adaptive infinite impulse response (IIR) notch filter which is useful for the rejection of multiple narrow-band interference in quadrature phase shift keying (QPSK) spread spectrum communication systems. The signal-to-noise ratio (SNR) improvement factor has been obtained from which the validity of the use of the notch filter can be concluded.
2. We have investigated the problem of narrow-band interference (NBI) suppression in a direct-sequence code-division multiple-access (DS CDMA) communication system using adaptive IIR notch filter algorithms.
We first proposed a second-order lattice-based adaptive IIR notch filter with a normalized algorithm. We found out from the convergence analysis that for large NBI power or interference-to-signal power ratio (ISR), the convergence speed of the normalized algorithm is independent of the number of DS CDMA system active users and power of the NBI which is a desirable result.
Secondly, we analyzed the performance gain of the DS CDMA system afforded by the proposed second-order lattice-based adaptive IIR notch filter algorithms using SNR improvement factor of the decision variable and bit error rate (BER) as figures of merit. We found out that the SNR improvement factor increases with the power of the NBI and decreases with the number of DS CDMA system active users.
3. We proposed a region-of-interest (ROI) image coding based on multiple wavelet transforms. The proposed method can avoid much information loss for non ROI at lower constrained bit rate caused in JPEG-2000, therefore the subjective image quality for whole of restored image will be improved, maintaining the quality of ROI higher than that of non-ROI.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Hai-Yin Jiang: "Steady-state analysis of complex adaptive IIR notch filter and its application to QPSK communication systems"電子情報通信学会英文論文誌. Vol.E85-A. 1088-1095 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma: "Adaptive optimization of notch bandwidth of an IIR filter used to suppress narrow-band interference in DSSS systems"電子情報通信学会英文論文誌. Vol.E85-A. 1789-1797 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takao Hinamoto: "Design of two-dimensional adaptive digital notch filters"Multidimensional Systems and Signal Processing. 13. 407-417 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma: "Narrow-band interference rejection in DS CDMA communication using an adaptive IIR notch filter"Proc.45th IEEE Int.Midwest Symp.on Circuits and Systems. Vol.II. 404-407 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma: "Adaptive IIR notch filter with controlled bandwidth for narrow-band interference suppression in DS CDMA systems"Proc.IEEE International Symposium on Circuits and Systems. 採録決定(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shinji Fukuma: "An ROI image coding based on switching wavelet transform"Proc.IEEE International Symposium on Circuits and Systems. 採録決定(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hai-Yin Jiang.: "Steady-state analysis of complex adaptive IIR notch filter and its application to QPSK communication systems"Trans. IEICE Fundamentals. E85-A, no.5. 1088-1095 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma.: "Adaptive optimization of notch bandwidth of an IIR filter used to suppress narrow-band interference in DSSS system"Trans. IEICE Fundamentals. E85-A, no.8. 1789-1797 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takao Hinamoto.: "Design of two-dimensional adaptive digital notch filters"Multidimensional Systems and Signal Processing. 14, no.2. 407-417 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma.: "Narrow-band interference rejection in DS CDMA communications using an adaptive IIR notch filter"Proc. 45th IEEE Int. Midwest Symp. On Circuits and Systems. II. 404-407 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aloys Mvuma.: "Adaptive IIR notch filter with controlled bandwidth for narrow-band interference suppression in DS CDMA systems"Proc. IEEE International Symposium on Circuits and Systems. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shinji Fukuma.: "An ROI image coding based on switching wavelet transform"Proc. IEEE International Symposium on Circuits and Systems. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hai-Yin Jiang: "Steady-state analysis of complex adaptive IIR notch filter and its application to QPSK communication systems"電子情報通信学会英文論文誌. Vol.E85-A. 1088-1095 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Aloys Mvuma: "Adaptive optimization of notch bandwidth of an IIR filter used to suppress narrow-band interference in DSSS systems"電子情報通信学会英文論文誌. Vol.E85-A. 1789-1797 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Takao Hinamoto: "Design of two-dimensional adaptive digital notch filters"Multidimensional Systems and Signal Processing. 13. 407-417 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Aloys Mvuma: "Narrow-band interference rejection in DS CDMA communications using an adaptive IIR notch filter"Proc. 45th IEEE Int. Midwest Symp. on Circuits and Systems. Vol.II. 404-407 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Aloys Mvuma: "Adaptive IIR notch filter with controlled bandwidth for narrow-band interference suppression in DS CDMA systems"Proc. IEEE International Symposium on Circuits and Systems. (採録決定印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Shinji Fukuma: "An ROI image coding based on switching wavelet transform"Proc. IEEE International Symposium on Circuits and Systems. (採録決定印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Shotaro Nishimura: "Performance improvement of DSSS communication systems using an adaptive IIR notch filter"Proc. IEEE International Symposium on Circuits and Systems. Vol.III. 813-816 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Aloys Mvuma: "Suppression of narrow-band interference in a DS spread-spectrum receiver using a lattice-based adaptive IIR notch filter"Proceedings of ITC-CSCC '01, Tokushima, Japan. Vol.II. 909-912 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Aloys Mvuma: "Adaptive optimization of notch bandwidth of an IIR filter used to suppress narrow-band interference in DS-SS system"第16回ディジタル信号処理シンポジウム講演論文集. 583-588 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 山口達也: "適応ノッチフィルタの日本語地方言語分析への応用"第16回ディジタル信号処理シンポジウム講演論文集. 577-582 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Aloys Mvuma: "Adaptive optimization of notch bandwidth of an IIR filter used to suppress narrow-band interference"Proc. IEEE International Symposium on Circuits and Systems, May 2002, Phoenix Arizona. (採録決定)(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hai-Yin Jiang: "Steady-state analysis of complex adaptive IIR notch filter and its application to QPSK communication"電子情報通信学会英文誌. Vol.E85-A(印刷中). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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