JP4504317B2 - Mc−cdmaシステム、送信装置および受信装置 - Google Patents
Mc−cdmaシステム、送信装置および受信装置 Download PDFInfo
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- JP4504317B2 JP4504317B2 JP2006009005A JP2006009005A JP4504317B2 JP 4504317 B2 JP4504317 B2 JP 4504317B2 JP 2006009005 A JP2006009005 A JP 2006009005A JP 2006009005 A JP2006009005 A JP 2006009005A JP 4504317 B2 JP4504317 B2 JP 4504317B2
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- 230000007480 spreading Effects 0.000 claims description 59
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000003111 delayed effect Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 description 31
- 238000012545 processing Methods 0.000 description 12
- 238000004422 calculation algorithm Methods 0.000 description 10
- 238000001228 spectrum Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 108010003272 Hyaluronate lyase Proteins 0.000 description 8
- 238000005562 fading Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
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- 230000000875 corresponding effect Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
- H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
- H04J13/0048—Walsh
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J2013/165—Joint allocation of code together with frequency or time
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
松本渉,落合秀樹,"OFDM変調方式の応用,"トリケップス社,2001. N.Yee,and J.P.Linnartz,"Controlled equalization of multicarrier CDMA in indoor rician fading channel,"Proc. IEEE VTC ’94 pp.1665-1669,1994. A.Chouly,A.Brajal,and S.Jourdan,"Orthogonal multicarrier techniques applied to direct sequence spread spectrum CDMA systems,"Proc. IEEE GLOBECOM ’93,pp.1723-1728,Sep. 1999. S.Hara and R.Prasad,"Design and performance of multicarrier CDMA systems in frequency-selective Rayleigh fading channels,"IEEE Trans. Veh. Technol.,vol. 48,pp.1584-1595,Sep.1999.
まず、少数ユーザ時において拡散符号を選択する場合について説明する。提案直交拡散符号を用いることによって、遅延波成分による干渉は遅延時間に応じた拡散符号のみに現れる。つまり、あらかじめ影響の受けにくいように拡散符号を選ぶことで、遅延波の影響を軽減させることができる。nを自然数、k'=nk(k=1,2,...,L-1)とすると、提案拡散符号系列は以下のように表される。
次に、多数ユーザ時のビタビアルゴリズムを用いたマルチユーザ推定法について説明する。
Claims (4)
- 送信信号を拡散して送信するMC-CDMA送信装置において、周波数領域で送信信号に振幅が1でユーザ間で直交する正弦波状の信号を掛け合わせて拡散し、直交する複数のサブキャリアに分割して多重化して送信する構成を有し、拡散と多重化の処理を逆フーリエ変換で行った後、ランダムな位相を持つ位相マスクを用いて各サブキャリアの位相をシフトさせることを特徴とするMC-CDMA送信装置。
- 拡散符号が、遅延波の遅延時間に対して他の拡散符号と一致するような拡散符号である請求項1記載のMC-CDMA送信装置。
- 請求項1に記載のMC-CDMA送信装置によって拡散された送信信号を受信するMC-CDMA受信装置において、周波数領域で受信信号に振幅が1でユーザ間で直交する正弦波状の信号を掛け合わせて逆拡散し、送信信号を受信する構成を有し、請求項1に記載のMC-CDMA送信装置において用いた位相マスクを用いて各サブキャリアの位相を設定し直した後に、逆拡散をフーリエ変換で行うことを特徴とするMC-CDMA受信装置
- 拡散符号が、遅延波の遅延時間に対して他の拡散符号と一致するような拡散符号である請求項3記載のMC-CDMA受信装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006009005A JP4504317B2 (ja) | 2006-01-17 | 2006-01-17 | Mc−cdmaシステム、送信装置および受信装置 |
EP07707273.4A EP1974487B1 (en) | 2006-01-17 | 2007-01-17 | Mc-cdma system, transmitter and receiver |
PCT/JP2007/051022 WO2007083819A1 (en) | 2006-01-17 | 2007-01-17 | Mc-cdma system, transmitter and receiver |
CN200780003227XA CN101375536B (zh) | 2006-01-17 | 2007-01-17 | 多载波码分多址系统、发射器以及接收器 |
KR20087017487A KR101023004B1 (ko) | 2006-01-17 | 2007-01-17 | Mc-cdma 시스템, 송신기 및 수신기 |
US12/161,128 US8054866B2 (en) | 2006-01-17 | 2007-01-17 | MC-CDMA system, transmitter and receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006009005A JP4504317B2 (ja) | 2006-01-17 | 2006-01-17 | Mc−cdmaシステム、送信装置および受信装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007194727A JP2007194727A (ja) | 2007-08-02 |
JP4504317B2 true JP4504317B2 (ja) | 2010-07-14 |
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Application Number | Title | Priority Date | Filing Date |
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JP2006009005A Expired - Fee Related JP4504317B2 (ja) | 2006-01-17 | 2006-01-17 | Mc−cdmaシステム、送信装置および受信装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8054866B2 (ja) |
EP (1) | EP1974487B1 (ja) |
JP (1) | JP4504317B2 (ja) |
KR (1) | KR101023004B1 (ja) |
CN (1) | CN101375536B (ja) |
WO (1) | WO2007083819A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6396819B1 (en) | 1998-03-21 | 2002-05-28 | Richard D. Fleeter | Low-cost satellite communication system |
US7227884B2 (en) | 2000-02-28 | 2007-06-05 | Aeroastro, Inc. | Spread-spectrum receiver with progressive fourier transform |
US8670493B2 (en) | 2005-06-22 | 2014-03-11 | Eices Research, Inc. | Systems and/or methods of increased privacy wireless communications |
US7592953B2 (en) | 2005-12-30 | 2009-09-22 | Comtech Mobile Datacom Corporation | Mobile satellite communications |
US8548107B1 (en) | 2009-01-26 | 2013-10-01 | Comtech Mobile Datacom Corporation | Advanced multi-user detector |
US9106364B1 (en) | 2009-01-26 | 2015-08-11 | Comtech Mobile Datacom Corporation | Signal processing of a high capacity waveform |
JP5420275B2 (ja) * | 2009-03-03 | 2014-02-19 | 株式会社Nttドコモ | 符号多重伝送方法、送信装置及び受信装置 |
US8675711B1 (en) * | 2009-09-25 | 2014-03-18 | Comtech Mobile Datacom Corporation | System and methods for dynamic spread spectrum usage |
US8976878B2 (en) * | 2013-01-15 | 2015-03-10 | Raytheon Company | Polynomial phases for multi-carrier modulation schemes with time domain windowing |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003101511A (ja) * | 2001-09-26 | 2003-04-04 | Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd | マルチキャリアスペクトル拡散通信装置及びマルチキャリアスペクトル拡散通信システム |
JP2005192000A (ja) * | 2003-12-26 | 2005-07-14 | Toshiba Corp | マルチキャリア通信システムおよびこのシステムに用いられる送信装置、受信装置、送信方法、受信方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3715141B2 (ja) * | 1999-07-13 | 2005-11-09 | 松下電器産業株式会社 | 通信端末装置 |
EP1133841B1 (en) * | 1999-09-29 | 2008-05-14 | Samsung Electronics Co., Ltd. | System and method for compensating timing errors using pilot symbols in a ofdm/cdma communication system |
JP3490384B2 (ja) * | 2000-07-31 | 2004-01-26 | 松下電器産業株式会社 | マルチキャリアcdma通信装置 |
CA2361247C (en) | 2000-11-06 | 2008-10-07 | Ntt Docomo, Inc. | Transmitter, transmitting method, receiver, and receiving method for mc-cdma communication system |
JP3628977B2 (ja) * | 2001-05-16 | 2005-03-16 | 松下電器産業株式会社 | 無線基地局装置及び通信端末装置 |
EP1453229A4 (en) * | 2001-08-30 | 2007-07-11 | Fujitsu Ltd | MULTI-CARRIER CDMA TRANSMISSION SYSTEM AND METHOD |
JP3940414B2 (ja) * | 2002-08-28 | 2007-07-04 | 富士通株式会社 | 受信装置及びそのフレームタイミング検出方法 |
AU2003284708A1 (en) | 2003-11-24 | 2005-06-08 | Broad Mobile Co., Ltd | Multicarrier cdma transmitting device and method using frequency hopping method |
KR100534594B1 (ko) * | 2003-12-27 | 2005-12-07 | 한국전자통신연구원 | 다중반송파 코드분할다중접속 시스템에서 적응형 하향링크패킷 전송방법 |
US7181284B2 (en) | 2004-03-17 | 2007-02-20 | Medtronic, Inc. | Apparatus and methods of energy efficient, atrial-based Bi-ventricular fusion-pacing |
US7804912B2 (en) * | 2004-09-23 | 2010-09-28 | Motorola, Inc. | Method and apparatus for encryption of over-the-air communications in a wireless communication system |
KR20060082228A (ko) * | 2005-01-11 | 2006-07-18 | 삼성전자주식회사 | 다중반송파부호분할다중접속 시스템을 위한 파일럿 기반의채널 추정 방법 |
WO2007015490A1 (ja) * | 2005-08-03 | 2007-02-08 | National University Corporation NARA Institute of Science and Technology | 送信機および受信機 |
-
2006
- 2006-01-17 JP JP2006009005A patent/JP4504317B2/ja not_active Expired - Fee Related
-
2007
- 2007-01-17 WO PCT/JP2007/051022 patent/WO2007083819A1/en active Application Filing
- 2007-01-17 US US12/161,128 patent/US8054866B2/en not_active Expired - Fee Related
- 2007-01-17 EP EP07707273.4A patent/EP1974487B1/en not_active Not-in-force
- 2007-01-17 CN CN200780003227XA patent/CN101375536B/zh not_active Expired - Fee Related
- 2007-01-17 KR KR20087017487A patent/KR101023004B1/ko active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003101511A (ja) * | 2001-09-26 | 2003-04-04 | Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd | マルチキャリアスペクトル拡散通信装置及びマルチキャリアスペクトル拡散通信システム |
JP2005192000A (ja) * | 2003-12-26 | 2005-07-14 | Toshiba Corp | マルチキャリア通信システムおよびこのシステムに用いられる送信装置、受信装置、送信方法、受信方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1974487A4 (en) | 2013-07-24 |
KR101023004B1 (ko) | 2011-03-22 |
EP1974487A1 (en) | 2008-10-01 |
EP1974487B1 (en) | 2016-03-16 |
JP2007194727A (ja) | 2007-08-02 |
WO2007083819A1 (en) | 2007-07-26 |
KR20080077697A (ko) | 2008-08-25 |
US20100166043A1 (en) | 2010-07-01 |
CN101375536A (zh) | 2009-02-25 |
US8054866B2 (en) | 2011-11-08 |
CN101375536B (zh) | 2012-07-18 |
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