GB1328595A - Carrier frequency telecommunications systems - Google Patents
Carrier frequency telecommunications systemsInfo
- Publication number
- GB1328595A GB1328595A GB3936071A GB3936071A GB1328595A GB 1328595 A GB1328595 A GB 1328595A GB 3936071 A GB3936071 A GB 3936071A GB 3936071 A GB3936071 A GB 3936071A GB 1328595 A GB1328595 A GB 1328595A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- station
- sequence
- signal
- transmission
- 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
Links
- 230000005540 biological transmission Effects 0.000 abstract 4
- 238000004458 analytical method Methods 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/12—Frequency diversity
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
1328595 Radio signalling SIEMENS AG 23 Aug 1971 [25 Aug 1970] 39360/71 Heading H4L In a carrier frequency telecommunication system in which a plurality of different frequency carrier waves are available and means are provided at each station for selecting the carrier wave giving the best results, the receiver of each station in its inoperative condition scans the frequency positions of the carrier in a predetermined sequence and the transmitter at the calling station automatically transmits a synchronizing signal at each frequency position in the same sequence which is followed by a test signal which may contain the address of the called station at each frequency position in the sequence. When the receiver at the called station detects the sync. signal at one of the frequency positions it is automatically synchronized and it then analyses the sequence of test signals to determine the quality at the respective frequency positions. When the best carrier wave frequency has been determined the called station transmits back a test signal at each frequency position in the sequence which includes identification of the frequency providing the best signal, and this frequency is then used by the calling station transmitter. At the calling station the test signals are similarly analysed to determine the best frequency for the return direction and this information is automatically transmitted to the called station. During normal transmission, if the quality of the transmission goes below a predetermined limit, the transmission is interrupted and hunting for the best frequency position commences. The quality of the transmission may be measured by the means disclosed in Specification 1,328,594.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702042133 DE2042133C3 (en) | 1970-08-25 | Process for the automatic finding of suitable frequency locations during data transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1328595A true GB1328595A (en) | 1973-08-30 |
Family
ID=5780686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3936071A Expired GB1328595A (en) | 1970-08-25 | 1971-08-23 | Carrier frequency telecommunications systems |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH526238A (en) |
| GB (1) | GB1328595A (en) |
| NL (1) | NL7111705A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2124060A (en) * | 1982-07-12 | 1984-02-08 | Spt Video Limited | Improvements in or relating to circuit arrangements for automatic selection of television sound frequency |
| GB2133253A (en) * | 1982-12-01 | 1984-07-18 | Tadiran Israel Elect Ind Ltd | Frequency management system |
| US4555806A (en) * | 1982-03-27 | 1985-11-26 | Rohde & Schwarz Gmbh & Co. Kg | System for the automatic establishment of a shortwave telegraphy signal connection |
| GB2288949A (en) * | 1994-04-22 | 1995-11-01 | Motorola Ltd | Hand-off to a different channel within the current base station |
-
1971
- 1971-06-25 CH CH931471A patent/CH526238A/en not_active IP Right Cessation
- 1971-08-23 GB GB3936071A patent/GB1328595A/en not_active Expired
- 1971-08-25 NL NL7111705A patent/NL7111705A/xx unknown
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4555806A (en) * | 1982-03-27 | 1985-11-26 | Rohde & Schwarz Gmbh & Co. Kg | System for the automatic establishment of a shortwave telegraphy signal connection |
| DE3211325C1 (en) * | 1982-03-27 | 1989-05-18 | Rohde & Schwarz GmbH & Co KG, 8000 München | System for the automatic establishment of a shortwave telegraphic sign connection |
| GB2124060A (en) * | 1982-07-12 | 1984-02-08 | Spt Video Limited | Improvements in or relating to circuit arrangements for automatic selection of television sound frequency |
| GB2133253A (en) * | 1982-12-01 | 1984-07-18 | Tadiran Israel Elect Ind Ltd | Frequency management system |
| GB2288949A (en) * | 1994-04-22 | 1995-11-01 | Motorola Ltd | Hand-off to a different channel within the current base station |
| US5625875A (en) * | 1994-04-22 | 1997-04-29 | Motorola, Inc. | Method for allocating communications resources in a radio communications system |
| GB2288949B (en) * | 1994-04-22 | 1998-04-08 | Motorola Ltd | Communications system |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7111705A (en) | 1972-02-29 |
| CH526238A (en) | 1972-07-31 |
| DE2042133A1 (en) | 1972-03-02 |
| DE2042133B2 (en) | 1976-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |
