SE8901937D0 - SYSTEM - Google Patents

SYSTEM

Info

Publication number
SE8901937D0
SE8901937D0 SE8901937A SE8901937A SE8901937D0 SE 8901937 D0 SE8901937 D0 SE 8901937D0 SE 8901937 A SE8901937 A SE 8901937A SE 8901937 A SE8901937 A SE 8901937A SE 8901937 D0 SE8901937 D0 SE 8901937D0
Authority
SE
Sweden
Prior art keywords
power
multiplication
spread
transmisiion
oqpsk
Prior art date
Application number
SE8901937A
Other languages
Swedish (sv)
Inventor
P Sehier
Original Assignee
Alcatel Thomson Faisceaux
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 Alcatel Thomson Faisceaux filed Critical Alcatel Thomson Faisceaux
Publication of SE8901937D0 publication Critical patent/SE8901937D0/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0003—Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
    • 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
    • H04B1/7073—Synchronisation aspects
    • 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
    • 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
    • H04B1/709—Correlator structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A spread spectrum digital data transmisiion and reception system operates using offset quaternary phase shift keying (OQPSK). The data signal, differentially encoded and spread using a PN sequence, undergoes complex multiplication by a power of j prior to modulation with carrier exp(j2#f 0 t). At the receiver, multiplication by a power of -j occurs at 21, after demodulation, filter and sample unit 20. Tracking 26, acquisition 25 and phase recover 24 are thus simplified, all useful information being moved into the real channel.
SE8901937A 1988-05-31 1989-05-30 SYSTEM SE8901937D0 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8807219A FR2751816A1 (en) 1988-05-31 1988-05-31 OQPSK digital data transmission system

Publications (1)

Publication Number Publication Date
SE8901937D0 true SE8901937D0 (en) 1989-05-30

Family

ID=9366770

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8901937A SE8901937D0 (en) 1988-05-31 1989-05-30 SYSTEM

Country Status (4)

Country Link
FR (1) FR2751816A1 (en)
GB (1) GB2319147B (en)
IT (1) IT8967383A0 (en)
SE (1) SE8901937D0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1311073A1 (en) 2001-11-12 2003-05-14 Texas Instruments Incorporated Modulation system for complex spreading codes
CN102075472B (en) * 2011-02-16 2014-12-31 四川九洲电器集团有限责任公司 Method for spreading intermediate frequency of OQPSK and despreading and demodulating spread intermediate frequency

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1191905A (en) * 1982-06-30 1985-08-13 Canadian Patents And Development Limited/Societe Canadienne Des Brevets Et D'exploitation Limitee Spread spectrum modem

Also Published As

Publication number Publication date
GB2319147B (en) 1998-09-02
IT8967383A0 (en) 1989-05-23
FR2751816A1 (en) 1998-01-30
GB2319147A (en) 1998-05-13
GB8912003D0 (en) 1998-02-18

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