IT1206820B - Modem "spread spectrum" digitale a sequenza diretta - Google Patents

Modem "spread spectrum" digitale a sequenza diretta

Info

Publication number
IT1206820B
IT1206820B IT8748114A IT4811487A IT1206820B IT 1206820 B IT1206820 B IT 1206820B IT 8748114 A IT8748114 A IT 8748114A IT 4811487 A IT4811487 A IT 4811487A IT 1206820 B IT1206820 B IT 1206820B
Authority
IT
Italy
Prior art keywords
modem
spread spectrum
direct sequence
sequence digital
digital
Prior art date
Application number
IT8748114A
Other languages
English (en)
Other versions
IT8748114A0 (it
Inventor
Martinino Francesco
Pugnaloni Andrea
Tripodi Maurizio
Original Assignee
Selenia Spazio Spa
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 Selenia Spazio Spa filed Critical Selenia Spazio Spa
Priority to IT8748114A priority Critical patent/IT1206820B/it
Publication of IT8748114A0 publication Critical patent/IT8748114A0/it
Priority to US07/210,725 priority patent/US4894841A/en
Priority to EP19880110080 priority patent/EP0301240A3/en
Priority to JP63157021A priority patent/JPS6424532A/ja
Application granted granted Critical
Publication of IT1206820B publication Critical patent/IT1206820B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/003—Correction of carrier offset at baseband only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0046—Open loops
    • H04L2027/0051—Harmonic tracking

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
IT8748114A 1987-06-26 1987-06-26 Modem "spread spectrum" digitale a sequenza diretta IT1206820B (it)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IT8748114A IT1206820B (it) 1987-06-26 1987-06-26 Modem "spread spectrum" digitale a sequenza diretta
US07/210,725 US4894841A (en) 1987-06-26 1988-06-23 Digital direct-sequence spread-spectrum modem
EP19880110080 EP0301240A3 (en) 1987-06-26 1988-06-24 Direct sequence digital spread spectrum modem
JP63157021A JPS6424532A (en) 1987-06-26 1988-06-27 Direct sequence digital diffusion spectrum modulator/demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8748114A IT1206820B (it) 1987-06-26 1987-06-26 Modem "spread spectrum" digitale a sequenza diretta

Publications (2)

Publication Number Publication Date
IT8748114A0 IT8748114A0 (it) 1987-06-26
IT1206820B true IT1206820B (it) 1989-05-03

Family

ID=11264608

Family Applications (1)

Application Number Title Priority Date Filing Date
IT8748114A IT1206820B (it) 1987-06-26 1987-06-26 Modem "spread spectrum" digitale a sequenza diretta

Country Status (4)

Country Link
US (1) US4894841A (it)
EP (1) EP0301240A3 (it)
JP (1) JPS6424532A (it)
IT (1) IT1206820B (it)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0748707B2 (ja) * 1988-09-06 1995-05-24 三菱電機株式会社 直接拡散変調装置
KR910005247B1 (ko) * 1988-10-13 1991-07-24 삼성전자 주식회사 대역 확산 방식을 이용한 이동발신장치
CH679718A5 (it) * 1989-10-19 1992-03-31 Ascom Zelcom Ag
AU642571B2 (en) * 1991-01-21 1993-10-21 Sony Corporation Spread spectrum signal receiving apparatus
US5150378A (en) * 1991-10-07 1992-09-22 General Electric Company Method and apparatus for coherent communications in non-coherent frequency-hopping system
US5276703A (en) * 1992-01-13 1994-01-04 Windata, Inc. Wireless local area network communications system
AU660357B2 (en) * 1992-03-23 1995-06-22 Sharp Kabushiki Kaisha Spread spectrum communication system and an apparatus for communication
JP3280141B2 (ja) * 1993-04-30 2002-04-30 キヤノン株式会社 スペクトラム拡散受信装置
US6046991A (en) * 1997-04-09 2000-04-04 Aloha Networks, Inc. TDM variable broadcast energy transmitter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32905A (en) * 1861-07-23 Daniel B Waite Watch and socket rim
US4455651A (en) * 1980-10-20 1984-06-19 Equatorial Communications Company Satellite communications system and apparatus
US4559633A (en) * 1982-10-22 1985-12-17 Hitachi, Ltd. Spread spectrum system
DE3427058A1 (de) * 1984-07-23 1986-02-06 Standard Elektrik Lorenz Ag, 7000 Stuttgart Empfaenger fuer bandgespreizte signale
US4607375A (en) * 1984-10-17 1986-08-19 Itt Corporation Covert communication system

Also Published As

Publication number Publication date
EP0301240A3 (en) 1990-11-14
US4894841A (en) 1990-01-16
IT8748114A0 (it) 1987-06-26
JPS6424532A (en) 1989-01-26
EP0301240A2 (en) 1989-02-01

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19970124