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WO2002011333A1 - Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting - Google Patents

Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting Download PDF

Info

Publication number
WO2002011333A1
WO2002011333A1 PCT/JP2000/005086 JP0005086W WO0211333A1 WO 2002011333 A1 WO2002011333 A1 WO 2002011333A1 JP 0005086 W JP0005086 W JP 0005086W WO 0211333 A1 WO0211333 A1 WO 0211333A1
Authority
WO
WIPO (PCT)
Prior art keywords
amplitude limiting
code
signal transmitter
multiplexing signal
transmitter performing
Prior art date
Application number
PCT/JP2000/005086
Other languages
French (fr)
Japanese (ja)
Inventor
Yasuyuki Oishi
Tokuro Kubo
Takayoshi Ode
Kazuo Nagatani
Hajime Hamada
Hiroyoshi Ishikawa
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2000/005086 priority Critical patent/WO2002011333A1/en
Publication of WO2002011333A1 publication Critical patent/WO2002011333A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • 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
    • 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
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

The amplitude of a code-multiplexed signal is represented by data X. A high-order table (101) contains a limiting coefficient with a key of the high-order bit string including the highest-order bit of the data X. A low-order table (102) contains a limiting coefficient with a key of the low-order bit string including the lowest-order bit of the data X. A selection unit (105) selects either of a limiting coefficient extracted from the high-order table (101) or one from the low-order table (102) depending on the amplitude of the code-multiplexed signal. Multipliers (106i, 106q) limit the amplitude of the code-multiplexed signal using the selected limiting coefficient.
PCT/JP2000/005086 2000-08-01 2000-08-01 Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting WO2002011333A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/005086 WO2002011333A1 (en) 2000-08-01 2000-08-01 Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/005086 WO2002011333A1 (en) 2000-08-01 2000-08-01 Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting

Publications (1)

Publication Number Publication Date
WO2002011333A1 true WO2002011333A1 (en) 2002-02-07

Family

ID=11736305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/005086 WO2002011333A1 (en) 2000-08-01 2000-08-01 Amplitude limiting circuit and code-multiplexing signal transmitter performing amplitude limiting

Country Status (1)

Country Link
WO (1) WO2002011333A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958922A (en) * 1982-09-28 1984-04-04 Fujitsu Ltd Automatic gain control system
JPH0879132A (en) * 1994-09-05 1996-03-22 Matsushita Commun Ind Co Ltd Spread spectrum system communication equipment
JPH0888588A (en) * 1994-07-21 1996-04-02 Canon Inc Spread spectrum communication equipment
JPH0918451A (en) * 1995-06-30 1997-01-17 Nec Corp Cdma base station transmitter
JPH1065647A (en) * 1996-08-23 1998-03-06 N T T Ido Tsushinmo Kk Multiplex modulation device
JPH11234229A (en) * 1998-02-10 1999-08-27 Nec Saitama Ltd Peak clipping device
US6009090A (en) * 1996-12-19 1999-12-28 Fujitsu Limited Code multiplexing wireless apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958922A (en) * 1982-09-28 1984-04-04 Fujitsu Ltd Automatic gain control system
JPH0888588A (en) * 1994-07-21 1996-04-02 Canon Inc Spread spectrum communication equipment
JPH0879132A (en) * 1994-09-05 1996-03-22 Matsushita Commun Ind Co Ltd Spread spectrum system communication equipment
JPH0918451A (en) * 1995-06-30 1997-01-17 Nec Corp Cdma base station transmitter
JPH1065647A (en) * 1996-08-23 1998-03-06 N T T Ido Tsushinmo Kk Multiplex modulation device
US6009090A (en) * 1996-12-19 1999-12-28 Fujitsu Limited Code multiplexing wireless apparatus
JPH11234229A (en) * 1998-02-10 1999-08-27 Nec Saitama Ltd Peak clipping device

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