AU553652B2 - Frequency-hopping radio communications - Google Patents

Frequency-hopping radio communications

Info

Publication number
AU553652B2
AU553652B2 AU10623/83A AU1062383A AU553652B2 AU 553652 B2 AU553652 B2 AU 553652B2 AU 10623/83 A AU10623/83 A AU 10623/83A AU 1062383 A AU1062383 A AU 1062383A AU 553652 B2 AU553652 B2 AU 553652B2
Authority
AU
Australia
Prior art keywords
sequence
frequency
stations
station
hopping radio
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.)
Ceased
Application number
AU10623/83A
Other versions
AU1062383A (en
Inventor
Paul Wilkinson Dent
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Publication of AU1062383A publication Critical patent/AU1062383A/en
Application granted granted Critical
Publication of AU553652B2 publication Critical patent/AU553652B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Radio Relay Systems (AREA)

Abstract

A frequency-hopping radio communication system in which a network of stations operate on the same sequence of frequencies, in synchronism, controlled by pseudo-random generators which are initially synchronised. Each station has means for modifying its p.r. sequence dependent only upon the instant in the main line sequence at which the modification is switched. In order to communicate, one station transmits, on the current main-line frequency sequence, the address of the desired other station and then signals the sequence switch. At this instant both transmitting and receiving stations switch to a modified frequency sequence and are thus isolated from the remaining stations. At the end of the message a signal from the transmitting to the receiving station causes both stations to revert to the main line sequence.
AU10623/83A 1982-01-27 1983-01-20 Frequency-hopping radio communications Ceased AU553652B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8202357 1982-01-27
GB8202357 1982-01-27

Publications (2)

Publication Number Publication Date
AU1062383A AU1062383A (en) 1983-08-04
AU553652B2 true AU553652B2 (en) 1986-07-24

Family

ID=10527920

Family Applications (1)

Application Number Title Priority Date Filing Date
AU10623/83A Ceased AU553652B2 (en) 1982-01-27 1983-01-20 Frequency-hopping radio communications

Country Status (7)

Country Link
EP (1) EP0084967B1 (en)
JP (1) JPS58161438A (en)
AT (1) ATE13789T1 (en)
AU (1) AU553652B2 (en)
DE (1) DE3360246D1 (en)
GB (1) GB2114402B (en)
IN (1) IN159180B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129655B (en) * 1982-09-08 1986-02-05 Racal Res Ltd Improvements in and relating to radio communications
IL82561A (en) * 1986-05-27 1991-12-15 Fairchild Weston Systems Inc Secure communication system for multiple remote units
US5056108A (en) * 1990-04-04 1991-10-08 Van Metre Lund Communication system
DE69230768T2 (en) * 1991-08-23 2000-09-28 Kabushiki Kaisha Toshiba, Kawasaki RADIO INFORMATION AND COMMUNICATION SYSTEM WITH A MULTI-CARRIER SPREADING SPECTRUM TRANSMISSION SYSTEM
WO1993021703A1 (en) * 1992-04-15 1993-10-28 Coachline Video Express Pty Ltd Signal distribution system
US5533046A (en) * 1992-10-08 1996-07-02 Lund; Vanmetre Spread spectrum communication system
US5463659A (en) * 1994-07-05 1995-10-31 At&T Ipm Corp. Apparatus and method of configuring a cordless telephone for operating in a frequency hopping system
US5809417A (en) * 1994-07-05 1998-09-15 Lucent Technologies Inc. Cordless telephone arranged for operating with multiple portable units in a frequency hopping system
GB9508885D0 (en) * 1995-05-02 1995-06-21 Plessey Semiconductors Ltd Wireless local area networks
GB2300547B (en) * 1995-05-02 1999-08-25 Plessey Semiconductors Ltd Wireless local area neworks
GB9513398D0 (en) * 1995-06-30 1995-09-27 Boateng Jacob K Automatic exchangeless universal radio phone
CA2300064A1 (en) * 1997-08-14 1999-02-25 Siemens Aktiengesellschaft Method and device for generating a random number sequence for carrier frequencies of a mobile radio transmission
WO1999066653A1 (en) * 1998-06-18 1999-12-23 Siemens Aktiengesellschaft Method and device for converting a random number sequence into carrier frequencies for mobile radio transmission
US8069468B1 (en) * 2000-04-18 2011-11-29 Oracle America, Inc. Controlling access to information over a multiband network
JP7197011B2 (en) * 2019-06-26 2022-12-27 日本電気株式会社 Height estimation device, height estimation method and program
JP7396364B2 (en) * 2019-10-31 2023-12-12 日本電気株式会社 Image processing device, image processing method, and image processing program
JP7355674B2 (en) 2020-02-18 2023-10-03 株式会社日立製作所 Video monitoring system and video monitoring method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH499931A (en) * 1968-02-12 1970-11-30 Patelhold Patentverwertung Synchronization method for program-controlled carrier shift keying
DE1939975A1 (en) * 1969-08-06 1971-02-18 Licentia Gmbh System for the transmission of binary coded messages
DE2457027B2 (en) * 1974-12-03 1977-02-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt PROCEDURE FOR PROGRAMMING ARRANGEMENTS FOR GENERATING RANDOM BINARY STRINGS

Also Published As

Publication number Publication date
AU1062383A (en) 1983-08-04
GB2114402A (en) 1983-08-17
EP0084967A2 (en) 1983-08-03
JPS58161438A (en) 1983-09-26
GB2114402B (en) 1985-06-05
EP0084967B1 (en) 1985-06-12
EP0084967A3 (en) 1983-08-10
IN159180B (en) 1987-04-04
DE3360246D1 (en) 1985-07-18
JPH0234499B2 (en) 1990-08-03
ATE13789T1 (en) 1985-06-15

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