JP4563453B2 - 送信機および受信機 - Google Patents
送信機および受信機 Download PDFInfo
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- JP4563453B2 JP4563453B2 JP2007529276A JP2007529276A JP4563453B2 JP 4563453 B2 JP4563453 B2 JP 4563453B2 JP 2007529276 A JP2007529276 A JP 2007529276A JP 2007529276 A JP2007529276 A JP 2007529276A JP 4563453 B2 JP4563453 B2 JP 4563453B2
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- 239000011159 matrix material Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 13
- 238000005562 fading Methods 0.000 description 11
- 238000007792 addition Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000969 carrier Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000005305 interferometry Methods 0.000 description 4
- 230000001131 transforming effect Effects 0.000 description 4
- 238000007476 Maximum Likelihood Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000004956 CI calculation Methods 0.000 description 1
- 238000003775 Density Functional Theory Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/42—Arrangements for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Transmitters (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
D.A.Wiegandt and C.R.Nassar, "High-performance OFDM via carrier interferometry," in Proc. IEEE Int. Conf. 3rd-Generation Wireless and Beyond, 3Gwireless'01, San Francisco, CA, 2001, pp.404-409 D.A.Wiegandt, C.R.Nassar, and Z.Wu, "Overcoming Peak-to-average power ratio issues in OFDM via carrier interferometry codes," in Proc. IEEE Vehicle Technology Conf., Atlantic City, NJ, 2001, pp.660-663
また、本発明の受信機では、上記の行列は、2つの行列から成り、これらの各行列の要素を用いて上記サブキャリアを変調する上記第4の変調手段は、第5の変調手段と第6の変調手段とから構成されており、この第6の変調手段の前段にはセパレーターが設けられていることが好ましい。
2 第1のIFFT部(第1の変調手段;第2の高速逆フーリエ変換手段)
3 第2のIFFT部(第1の高速逆フーリエ変換手段)
71 第1のFFT部(第1の高速フーリエ変換手段)
72 第2のFFT部(第4の変調手段)
73 パラレル−シリアル変換部(パラレル−シリアル変換手段)
78 シリアル−パラレル変換部(シリアル−パラレル変換手段)
79 第3のIFFT部(第2の変調手段)
80 第4のIFFT部(第3の変調手段)
81 セパレーター
84 第5のIFFT部(第1の高速逆フーリエ変換手段)
89 第3のFFT部(第1の高速フーリエ変換手段)
90 セパレーター
91 第4のFFT部(第5の変調手段)
92 第5のFFT部(第6の変調手段)
93 パラレル−シリアル変換部(パラレル−シリアル変換手段)
a2=j
a3=ja=−a*
a4=−1
a5=−a
a6=−j
a7=−ja=a*
a8=1
となる。
それゆえ、
W8 4=−W8 0
W8 5=−W8 1
W8 6=−W8 2
W8 7=−W8 3
となり、次の〔表1〕が成立する。この〔表1〕から、W8 0〜W8 7まで計算が必要であるIDFT(DFT)に比して、単に、W8 0〜W8 3まで計算すれば足りるIFFT(FFT)の方が計算を単純化することができることができる。また、この〔表1〕からDFT=CIとなっていることが分かる。
Claims (6)
- シリアルデータである元データを複数のサブキャリアに対応させるパラレルデータに変換するシリアル−パラレル変換手段と、このパラレルデータを周波数領域を示すデータから時間領域を示すデータに変換する第1の高速逆フーリエ変換手段とを有する送信機において、
上記シリアル−パラレル変換手段と上記第1の高速逆フーリエ変換手段との間に、時間領域信号値と周波数領域信号値とを用いて成るフーリエ変換を示す式から生成された行列の要素を用いて上記複数のサブキャリアを変調する第1の変調手段を備えており、
上記の行列は、2つの行列から成り、これらの各行列の要素を用いて上記複数のサブキャリアを変調する上記第1の変調手段は、第2の変調手段と第3の変調手段とから構成されており、この第3の変調手段の後段にはセパレーターが設けられていることを特徴とする送信機。 - 上記時間領域信号値と周波数領域信号値とを用いて成るフーリエ変換が高速逆フーリエ変換であり、上記第1の変調手段は、サブキャリアの数をNとしたとき、2Nlog2(N)+Nの数だけ加算および減算を行うことを特徴とする請求項1に記載の送信機。
- 元データを時間領域を示すデータから周波数領域を示すデータに変換する第1の高速フーリエ変換手段と、この第1の高速フーリエ変換手段から出力された複数のサブキャリアに対応させるパラレルデータをシリアルデータに変換するパラレル−シリアル変換手段とを有する受信機において、
上記第1の高速フーリエ変換手段と上記パラレル−シリアル変換手段との間に、時間領域信号値と周波数領域信号値とを用いて成るフーリエ変換を示す式から生成された行列の要素を用いて上記複数のサブキャリアを変調する第4の変調手段を備えており、
上記の行列は、2つの行列から成り、これらの各行列の要素を用いて上記サブキャリアを変調する上記第4の変調手段は、第5の変調手段と第6の変調手段とから構成されており、この第6の変調手段の前段にはセパレーターが設けられていることを特徴とする受信機。 - 上記時間領域信号値と周波数領域信号値とを用いて成るフーリエ変換が高速フーリエ変換であり、上記第4の変調手段は、サブキャリアの数をNとしたとき、2Nlog2(N)+Nの数だけ加算および減算を行うことを特徴とする請求項4に記載の受信機。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2005225604 | 2005-08-03 | ||
JP2005225604 | 2005-08-03 | ||
PCT/JP2006/315230 WO2007015490A1 (ja) | 2005-08-03 | 2006-08-01 | 送信機および受信機 |
Publications (2)
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JPWO2007015490A1 JPWO2007015490A1 (ja) | 2009-02-19 |
JP4563453B2 true JP4563453B2 (ja) | 2010-10-13 |
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US (1) | US7804764B2 (ja) |
JP (1) | JP4563453B2 (ja) |
WO (1) | WO2007015490A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101238662A (zh) * | 2005-07-27 | 2008-08-06 | 末广直树 | 数据通信系统及数据发送装置 |
JP2007124598A (ja) * | 2005-10-25 | 2007-05-17 | Kochi Univ Of Technology | マルチキャリア送受信方法 |
JP4504317B2 (ja) * | 2006-01-17 | 2010-07-14 | 学校法人同志社 | Mc−cdmaシステム、送信装置および受信装置 |
CN101174867B (zh) * | 2007-08-10 | 2012-07-04 | 北京邮电大学 | 一种降低多载波系统中高峰均功率比的方法 |
US9369324B2 (en) * | 2012-11-16 | 2016-06-14 | Icom Incorporated | Communication apparatus and communication method |
JP2019140521A (ja) | 2018-02-09 | 2019-08-22 | ルネサスエレクトロニクス株式会社 | 通信システム、通信デバイス、及び通信方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07226724A (ja) * | 1994-02-15 | 1995-08-22 | Toshiba Corp | Ofdm変調方法及びofdm復調方法並びにofdm変調装置及びofdm復調装置 |
JP2000209183A (ja) * | 1999-01-08 | 2000-07-28 | Sony Internatl Europ Gmbh | 同期バ―スト発生方法、無線直交周波数分割多重方式の同期方法、直交周波数分割多重方式の送信装置機及び移動通信装置 |
JP2001024617A (ja) * | 1999-07-02 | 2001-01-26 | Ntt Docomo Inc | 信号処理方法、並びに変調器、復調器、及び通信装置 |
JP2002359606A (ja) * | 2001-06-01 | 2002-12-13 | Toyo Commun Equip Co Ltd | Ofdm装置 |
JP2003008535A (ja) * | 2001-06-20 | 2003-01-10 | Fujitsu Ltd | データ伝送方法及びデータ伝送装置 |
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US7031371B1 (en) * | 2000-09-25 | 2006-04-18 | Lakkis Ismail A | CDMA/TDMA communication method and apparatus for wireless communication using cyclic spreading codes |
JP2002343478A (ja) * | 2001-05-16 | 2002-11-29 | Tyco Electronics Amp Kk | 電気コンタクトおよびそれを用いた電気接続部材 |
US7317750B2 (en) * | 2002-10-31 | 2008-01-08 | Lot 41 Acquisition Foundation, Llc | Orthogonal superposition coding for direct-sequence communications |
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2006
- 2006-08-01 WO PCT/JP2006/315230 patent/WO2007015490A1/ja active Application Filing
- 2006-08-01 US US11/989,869 patent/US7804764B2/en active Active
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07226724A (ja) * | 1994-02-15 | 1995-08-22 | Toshiba Corp | Ofdm変調方法及びofdm復調方法並びにofdm変調装置及びofdm復調装置 |
JP2000209183A (ja) * | 1999-01-08 | 2000-07-28 | Sony Internatl Europ Gmbh | 同期バ―スト発生方法、無線直交周波数分割多重方式の同期方法、直交周波数分割多重方式の送信装置機及び移動通信装置 |
JP2001024617A (ja) * | 1999-07-02 | 2001-01-26 | Ntt Docomo Inc | 信号処理方法、並びに変調器、復調器、及び通信装置 |
JP2002359606A (ja) * | 2001-06-01 | 2002-12-13 | Toyo Commun Equip Co Ltd | Ofdm装置 |
JP2003008535A (ja) * | 2001-06-20 | 2003-01-10 | Fujitsu Ltd | データ伝送方法及びデータ伝送装置 |
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JPWO2007015490A1 (ja) | 2009-02-19 |
US20080219147A1 (en) | 2008-09-11 |
WO2007015490A1 (ja) | 2007-02-08 |
US7804764B2 (en) | 2010-09-28 |
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