ATE13789T1 - RADIO COMMUNICATION SYSTEM. - Google Patents
RADIO COMMUNICATION SYSTEM.Info
- Publication number
- ATE13789T1 ATE13789T1 AT83300320T AT83300320T ATE13789T1 AT E13789 T1 ATE13789 T1 AT E13789T1 AT 83300320 T AT83300320 T AT 83300320T AT 83300320 T AT83300320 T AT 83300320T AT E13789 T1 ATE13789 T1 AT E13789T1
- Authority
- AT
- Austria
- Prior art keywords
- sequence
- stations
- station
- communication system
- radio communication
- Prior art date
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
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8202357 | 1982-01-27 | ||
EP83300320A EP0084967B1 (en) | 1982-01-27 | 1983-01-21 | Radio communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE13789T1 true ATE13789T1 (en) | 1985-06-15 |
Family
ID=10527920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT83300320T ATE13789T1 (en) | 1982-01-27 | 1983-01-21 | RADIO COMMUNICATION SYSTEM. |
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)
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 |
EP0667695B1 (en) * | 1991-08-23 | 2000-03-08 | Kabushiki Kaisha Toshiba | Radio information and communication system using multicarrier spread-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 |
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 |
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 |
GB2300547B (en) * | 1995-05-02 | 1999-08-25 | Plessey Semiconductors Ltd | Wireless local area neworks |
GB9508885D0 (en) * | 1995-05-02 | 1995-06-21 | Plessey Semiconductors Ltd | Wireless local area networks |
GB9513398D0 (en) * | 1995-06-30 | 1995-09-27 | Boateng Jacob K | Automatic exchangeless universal radio phone |
WO1999009668A1 (en) * | 1997-08-14 | 1999-02-25 | Siemens Aktiengesellschaft | Method and device for producing a random number sequence for carrier frequencies in a mobile radiotelephone system |
CA2335302A1 (en) * | 1998-06-18 | 1999-12-23 | Siemens Aktiengesellschaft | Method and apparatus for converting a random number sequence into carrier frequencies for a mobile radiotelephone transmission |
US8069468B1 (en) * | 2000-04-18 | 2011-11-29 | Oracle America, Inc. | Controlling access to information over a multiband network |
WO2020261403A1 (en) * | 2019-06-26 | 2020-12-30 | 日本電気株式会社 | Height estimation device, height estimation method, and non-transitory computer-readable medium having program stored thereon |
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)
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 |
-
1983
- 1983-01-18 IN IN30/DEL/83A patent/IN159180B/en unknown
- 1983-01-20 AU AU10623/83A patent/AU553652B2/en not_active Ceased
- 1983-01-21 GB GB08301655A patent/GB2114402B/en not_active Expired
- 1983-01-21 EP EP83300320A patent/EP0084967B1/en not_active Expired
- 1983-01-21 AT AT83300320T patent/ATE13789T1/en active
- 1983-01-21 DE DE8383300320T patent/DE3360246D1/en not_active Expired
- 1983-01-27 JP JP58012093A patent/JPS58161438A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
EP0084967A3 (en) | 1983-08-10 |
IN159180B (en) | 1987-04-04 |
AU553652B2 (en) | 1986-07-24 |
AU1062383A (en) | 1983-08-04 |
EP0084967A2 (en) | 1983-08-03 |
DE3360246D1 (en) | 1985-07-18 |
EP0084967B1 (en) | 1985-06-12 |
GB2114402B (en) | 1985-06-05 |
JPS58161438A (en) | 1983-09-26 |
JPH0234499B2 (en) | 1990-08-03 |
GB2114402A (en) | 1983-08-17 |
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