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A Study of Out-of-Band Emission Reduction of OFDM Signals for Cognitive Radio Systems

Research Project

Project/Area Number 15K06074
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Communication/Network engineering
Research InstitutionOsaka Prefecture University

Principal Investigator

Ohta Masaya  大阪府立大学, 人間社会システム科学研究科, 教授 (70288786)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsOFDM / 帯域外漏洩電力 / プレコーディング / 帯域外漏洩電力抑圧 / N-continuous OFDM
Outline of Final Research Achievements

In this research, we have proposed methods to improve complexity of N-continuous OFDM, which is excellent as a method of suppressing leakage power to adjacent bands of OFDM signals, and its improved methods NCSP-OFDM, hybrid methods of N-continuous OFDM and Orthogonal Precoding (OP). Our proposed methods have reduced a computational complexity of them and confirmed its effectiveness by computer simulations and experiments with software defined radios.
In addition, in the hybrid method of Spectrum Sculpting Precoder and OP, which is excellent as a method for creating deep in-band notches for cognitive radio systems, we have proposed a matrix decomposition method that can significantly reduce the amount of calculation by transforming the precoding matrix, which has been difficult to reduce the amount of calculation.

Academic Significance and Societal Importance of the Research Achievements

近年,無線通信システムの広帯域化に伴い周波数資源の枯渇が懸念されおり,その対策として考えられているコグニティブ無線において,OFDM信号の高い帯域外漏洩電力が実用化上の課題となっている.従来から提案されていたものの,実装上の問題があった帯域外漏洩電力技術を,本研究の成果は改善するもので,従来法の膨大な計算量を大幅に削減できる.これにより周波数資源が有効に活用できる高速大容量な無線通信システムの実装が容易となる.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (27 results)

All 2019 2018 2017 2016 2015

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (20 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Computational Complexity Reduction of Orthogonal Precoding for Out-of-Band Radiation Suppression in OFDM Signal2018

    • Author(s)
      松井貴洋, 太田正哉
    • Volume
      J101-B
    • Issue
      9
    • Pages
      828-832
    • DOI

      10.14923/transcomj.2018JBL4002

    • ISSN
      1344-4697
    • Year and Date
      2018-09-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Matrix Decomposition of Precoder Matrix in Orthogonal Precoding for Sidelobe Suppression of OFDM Signals2018

    • Author(s)
      Hikaru KAWASAKI, Masaya OHTA, Katsumi YAMASHITA
    • Journal Title

      IEICE Transactions on Communications

      Volume: E101.B Issue: 7 Pages: 1716-1722

    • DOI

      10.1587/transcom.2017EBP3329

    • NAID

      130007386901

    • ISSN
      0916-8516, 1745-1345
    • Year and Date
      2018-07-01
    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Matrix Decomposition for Low Computational Complexity in Orthogonal Precoding of N-continuous Schemes for Sidelobe Suppression of OFDM Signals2017

    • Author(s)
      Hikaru Kawasaki, Takahiro Matsui, Masaya Ohta, and Katsumi Yamashita
    • Journal Title

      IEIE Transactions on Smart Processing and Computing

      Volume: 6 Pages: 117-123

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Matrix Decomposition Suitable for FPGA Implementation of NCSP-OFDM for Sidelobe Suppression of OFDM Signals2017

    • Author(s)
      Hikaru Kawasaki, Zhiheng Zhou, Masaya Ohta, and Katsumi Yamashita
    • Journal Title

      IEIE Transactions on Smart Processing and Computing

      Volume: 6 Issue: 5 Pages: 372-377

    • DOI

      10.5573/ieiespc.2017.6.5.372

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Computational complexity reduction of NCSP-OFDM receiver for sidelobe suppression2016

    • Author(s)
      H.Kawasaki, J.Sasaki, M.Ohta, K.Yamashita
    • Journal Title

      IEICE Communications Express

      Volume: 5 Issue: 9 Pages: 316-321

    • DOI

      10.1587/comex.2016XBL0118

    • NAID

      130005263519

    • ISSN
      2187-0136
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Matrix decomposition of <i>N</i>-continuous OFDM suitable for FPGA implementation2016

    • Author(s)
      H.Kawasaki, K.Torigoe, M.Ohta, K.Yamashita
    • Journal Title

      IEICE Communications Express

      Volume: 5 Issue: 1 Pages: 1-6

    • DOI

      10.1587/comex.2015XBL0160

    • NAID

      130005120018

    • ISSN
      2187-0136
    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Study for Short-Range Communication System Using Smartphones During Base Stations Breakdown2015

    • Author(s)
      太田正哉, 鳥越薫平, 川崎耀, 山下勝己
    • Journal Title

      IEEJ Transactions on Electronics, Information and Systems

      Volume: 135 Issue: 11 Pages: 1345-1346

    • DOI

      10.1541/ieejeiss.135.1345

    • NAID

      130005106323

    • ISSN
      0385-4221, 1348-8155
    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Presentation] 窓関数を考慮したOrthogonal Precoding法によるOFDM信号の帯域外漏洩電力抑圧2019

    • Author(s)
      田中智規, 太田正哉
    • Organizer
      電子情報通信学会関西支部学生会研究発表講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 低帯域外漏洩電力特性を有するNCSP-OFDM信号のPAPR抑圧法2019

    • Author(s)
      太田正哉
    • Organizer
      電子情報通信学会通信方式研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] OFDM信号のSidelobe抑圧に適したOrthogonal Precodingの計算量削減に関する研究2017

    • Author(s)
      川崎耀, 松井貴洋, 太田正哉, 山下勝巳
    • Organizer
      電子情報通信学会通信方式研究会
    • Place of Presentation
      彦根
    • Year and Date
      2017-02-23
    • Related Report
      2016 Research-status Report
  • [Presentation] FPGA実装を考慮したNCSP-OFDM送信機のための行列分解法2017

    • Author(s)
      周志恒,川崎耀,太田正哉
    • Organizer
      平成29年電気関係学会関西連合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] OFDM信号のサイドローブ抑圧に適したOrthogonal Precoding の行列分解法2017

    • Author(s)
      松井貴洋,川崎燿,太田正哉
    • Organizer
      平成29年電気関係学会関西連合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] サイドローブ抑圧に適したNCSP-OFDMの部分プレコーディングによる計算量削減2017

    • Author(s)
      土井英夫,川崎耀,太田正哉
    • Organizer
      平成29年電気関係学会関西連合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] A Study on Low-Complexity Receiver of NCSP-OFDM for Sidelobe Suppresion2016

    • Author(s)
      H.Kawasaki, H.Doi, M.Ohta, K.Yamashita,
    • Organizer
      IEEE 5th Global Conference on Consumer Electronics
    • Place of Presentation
      京都
    • Year and Date
      2016-10-11
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Matrix Decomposition Suitable for FPGA Implementation of NCSP-OFDM2016

    • Author(s)
      H.Kawasaki, Z.Zhou, M.Ohta, K.Yamashita
    • Organizer
      the 31th International Technical Conference on Circuits/Systems, Computers and Communications
    • Place of Presentation
      那覇
    • Year and Date
      2016-07-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Computational COmplexity Reduction of Orthogonal Precoding of N-Continuous OFDM2016

    • Author(s)
      H.Kawasaki, T.Matsui, M.Ohta, K.Yamashita
    • Organizer
      Computational COmplexity Reduction of Orthogonal Precoding of N-Continuous OFDM
    • Place of Presentation
      那覇
    • Year and Date
      2016-07-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 低Sidelobeを有するNCSP-OFDM受信機における逆行列近似2016

    • Author(s)
      土井英夫, 川崎耀, 太田正哉, 山下勝己
    • Organizer
      第21回電子情報通信学会関西支部学生会学生研究発表講演会
    • Place of Presentation
      兵庫県立大学
    • Year and Date
      2016-03-01
    • Related Report
      2015 Research-status Report
  • [Presentation] 低Sidelobeを有するNCSP-OFDM送信機のFPGA実装2016

    • Author(s)
      周志恒, 川崎耀, 太田正哉, 山下勝己
    • Organizer
      第21回電子情報通信学会関西支部学生会学生研究発表講演会
    • Place of Presentation
      兵庫県立大学
    • Year and Date
      2016-03-01
    • Related Report
      2015 Research-status Report
  • [Presentation] OFDM信号のSidelobe抑圧に適したOrthogonal Precodingの行列分解法2016

    • Author(s)
      松井貴洋, 川崎耀, 太田正哉, 山下勝己
    • Organizer
      第21回電子情報通信学会関西支部学生会学生研究発表講演会
    • Place of Presentation
      兵庫県立大学
    • Year and Date
      2016-03-01
    • Related Report
      2015 Research-status Report
  • [Presentation] コグニティブ無線に向けたOrthogonal Precodingの計算量削減に関する研究2016

    • Author(s)
      川崎耀, 太田正哉, 山下勝己
    • Organizer
      電子情報通信学会通信方式研究会
    • Place of Presentation
      和歌山県白浜
    • Year and Date
      2016-02-25
    • Related Report
      2015 Research-status Report
  • [Presentation] OFDM信号のSidelobe抑圧のためのOrthogonal Precodingに関する研究2015

    • Author(s)
      川崎耀,太田正哉,山下勝己
    • Organizer
      IEEE COMS関西支部学生研究会
    • Place of Presentation
      大阪梅田
    • Year and Date
      2015-11-28
    • Related Report
      2015 Research-status Report
  • [Presentation] Sidelobe抑圧に適したNCSP-OFDM受信機の計算量に関する研究2015

    • Author(s)
      川崎燿,佐々木純,太田正哉,山下勝己
    • Organizer
      IEEE COMS関西支部学生研究会
    • Place of Presentation
      大阪梅田
    • Year and Date
      2015-11-28
    • Related Report
      2015 Research-status Report
  • [Presentation] 安否確認システムのための スマートフォンを用いた音響通信2015

    • Author(s)
      川崎耀,鳥越薫平,太田正哉,山下勝己
    • Organizer
      平成27年電気関係学会関西連合大会
    • Place of Presentation
      摂南大学
    • Year and Date
      2015-11-14
    • Related Report
      2015 Research-status Report
  • [Presentation] FPGA実装を考慮した N-continuous OFDMの改良法2015

    • Author(s)
      鳥越薫平,川崎耀,太田正哉,山下勝己
    • Organizer
      平成27年電気関係学会関西連合大会
    • Place of Presentation
      摂南大学
    • Year and Date
      2015-11-14
    • Related Report
      2015 Research-status Report
  • [Presentation] Computational Complexity Reduction of Orthogonal Precoding for Sidelobe Suppression of OFDM Signal2015

    • Author(s)
      H.Kawasaki, M.Ohta, K.Yamashita
    • Organizer
      The 21th Asia-Pacific Conference on Communications (APCC2015)
    • Place of Presentation
      京都大学
    • Year and Date
      2015-10-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] 帯域外漏洩電力抑圧に適したNCSP-OFDMのFPGA実装に関する研究2015

    • Author(s)
      川崎耀, 太田正哉, 山下勝己
    • Organizer
      電子情報通信学会通信方式研究会
    • Place of Presentation
      沖縄県久米島
    • Year and Date
      2015-07-02
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] Computational Complexity Reduction of NCSP-OFDM Demodulation for Sidelobe Suppression2015

    • Author(s)
      H.Kawasaki, J.Sasaki, M.Ohta, K.Yamashita
    • Organizer
      The 30th International Technical Conference of Circuits/Systems, Computers and Communications (ITC-CSCC2015)
    • Place of Presentation
      韓国ソウル
    • Year and Date
      2015-06-29
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-03-30  

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