GB2233860B - Communications systems - Google Patents

Communications systems

Info

Publication number
GB2233860B
GB2233860B GB8916097A GB8916097A GB2233860B GB 2233860 B GB2233860 B GB 2233860B GB 8916097 A GB8916097 A GB 8916097A GB 8916097 A GB8916097 A GB 8916097A GB 2233860 B GB2233860 B GB 2233860B
Authority
GB
United Kingdom
Prior art keywords
transmission
message
bit rate
prior
resultant
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
GB8916097A
Other versions
GB2233860A (en
GB8916097D0 (en
Inventor
Andrew William Jeffries
William Basil Harrold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Alcatel Submarine Networks UK Ltd
Nortel Networks Optical Components Ltd
Original Assignee
STC PLC
Northern Telecom Europe Ltd
STC Ltd
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 STC PLC, Northern Telecom Europe Ltd, STC Ltd filed Critical STC PLC
Priority to GB8916097A priority Critical patent/GB2233860B/en
Publication of GB8916097D0 publication Critical patent/GB8916097D0/en
Publication of GB2233860A publication Critical patent/GB2233860A/en
Application granted granted Critical
Publication of GB2233860B publication Critical patent/GB2233860B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0022—PN, e.g. Kronecker

Landscapes

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

Abstract

In a communications system employing HF radio transmission a message to be transmitted is subjected to time spreading modulation prior to transmission. The time spreading modulation results in processing gain at the receiver with either resultant transmission range increase, which is particularly beneficial in the case of inefficient antennae, or limited transmitter power, or permitting lower power to be used for a predetermined transmission range. A message 5 at a first bit rate is multiplied at 6 by a pseudo random spreading sequence 7 at a higher bit rate, and the resultant data stream is modulated at DPSK modulator 4 prior to transmission. <IMAGE>
GB8916097A 1989-07-13 1989-07-13 Communications systems Expired - Fee Related GB2233860B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8916097A GB2233860B (en) 1989-07-13 1989-07-13 Communications systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8916097A GB2233860B (en) 1989-07-13 1989-07-13 Communications systems

Publications (3)

Publication Number Publication Date
GB8916097D0 GB8916097D0 (en) 1990-04-25
GB2233860A GB2233860A (en) 1991-01-16
GB2233860B true GB2233860B (en) 1993-10-27

Family

ID=10660018

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8916097A Expired - Fee Related GB2233860B (en) 1989-07-13 1989-07-13 Communications systems

Country Status (1)

Country Link
GB (1) GB2233860B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706704B1 (en) * 1993-06-09 1995-07-13 Alcatel Telspace Spread spectrum digital transmission system obtained by low frequency pseudo-random coding of useful information and spread spectrum compression method used in such a system.
FR2728415B1 (en) * 1994-12-19 1997-01-24 Commissariat Energie Atomique TRANSMISSION METHOD WITH DIFFERENTIAL SPREAD SPECTRUM PHASE MODULATION AND DEMODULATION USING ORTHOGONAL PSEUDORANDOM SEQUENCES
FR2751499B1 (en) * 1996-07-16 1998-08-28 Duponteil Daniel DIGITAL DIFFERENTIAL DEMODULATION METHOD
JP4278332B2 (en) * 2001-06-29 2009-06-10 日本電信電話株式会社 Optical transmitter and optical transmission system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1175866A (en) * 1967-06-06 1970-01-01 Standard Telephones Cables Ltd Error detection and correction equipment
GB2003705A (en) * 1977-08-27 1979-03-14 Emi Ltd Spread spectrum data transmission
GB1585981A (en) * 1977-04-07 1981-03-11 Wittronics Inc Integer weighted impulse equivalent coded signal processing apparatus
GB2059723A (en) * 1979-09-19 1981-04-23 Marconi Co Ltd Interleavers for digital data signals
WO1985004298A1 (en) * 1984-03-20 1985-09-26 Applied Spectrum Technologies, Inc. Data and voice communications system
GB2160076A (en) * 1984-05-25 1985-12-11 Nat Res Dev Coding baseband signals
WO1986006568A1 (en) * 1985-04-25 1986-11-06 American Telephone & Telegraph Company Reversible energy spreading data transmission technique
GB2191914A (en) * 1986-06-23 1987-12-23 Thorn Emi Ferguson Audio/data transmission
WO1988000417A2 (en) * 1986-07-02 1988-01-14 ETAT FRANÇAIS représenté par LE SECRETARIAT D'ETAT Method and installation for digital communication, particularly between and toward moving vehicles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1175866A (en) * 1967-06-06 1970-01-01 Standard Telephones Cables Ltd Error detection and correction equipment
GB1585981A (en) * 1977-04-07 1981-03-11 Wittronics Inc Integer weighted impulse equivalent coded signal processing apparatus
GB2003705A (en) * 1977-08-27 1979-03-14 Emi Ltd Spread spectrum data transmission
GB2059723A (en) * 1979-09-19 1981-04-23 Marconi Co Ltd Interleavers for digital data signals
WO1985004298A1 (en) * 1984-03-20 1985-09-26 Applied Spectrum Technologies, Inc. Data and voice communications system
GB2160076A (en) * 1984-05-25 1985-12-11 Nat Res Dev Coding baseband signals
WO1986006568A1 (en) * 1985-04-25 1986-11-06 American Telephone & Telegraph Company Reversible energy spreading data transmission technique
GB2191914A (en) * 1986-06-23 1987-12-23 Thorn Emi Ferguson Audio/data transmission
WO1988000417A2 (en) * 1986-07-02 1988-01-14 ETAT FRANÇAIS représenté par LE SECRETARIAT D'ETAT Method and installation for digital communication, particularly between and toward moving vehicles

Also Published As

Publication number Publication date
GB2233860A (en) 1991-01-16
GB8916097D0 (en) 1990-04-25

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040713