JPS57164634A - Time division multidirectional communication system - Google Patents
Time division multidirectional communication systemInfo
- Publication number
- JPS57164634A JPS57164634A JP4839081A JP4839081A JPS57164634A JP S57164634 A JPS57164634 A JP S57164634A JP 4839081 A JP4839081 A JP 4839081A JP 4839081 A JP4839081 A JP 4839081A JP S57164634 A JPS57164634 A JP S57164634A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- station
- frequency
- slave station
- slave
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/212—Time-division multiple access [TDMA]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
PURPOSE:To reduce data errors, by detecting a frequency form a non-modulation signal from each slave station in the master station side and controlling the transmission frequency of the slave station. CONSTITUTION:Slave stations 2-1-2-n are provided for a master station 1. For example, the slave station 2-2 transmits a station identification signal SC and data DA in the second slot of an assigned time band. However, in case of the transmission of a non-modulation signal, this signal is transmitted in a partial time band in the center of the second slot. This non-modulation signal has the frequency detected in the receiving part of the master station and is sampled and held, and the difference signal is turned back to the slave station. This signal is stored in a memory 13 in the slave station, and its value is subjected to D/A conversion in a circuit 14, and an obtained analogue voltage is applied to a frequency discriminator 12. As the result, the oscillation frequency of an oscillator incorporated in a modulator 11 is controlled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4839081A JPS57164634A (en) | 1981-04-02 | 1981-04-02 | Time division multidirectional communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4839081A JPS57164634A (en) | 1981-04-02 | 1981-04-02 | Time division multidirectional communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57164634A true JPS57164634A (en) | 1982-10-09 |
JPS6258578B2 JPS6258578B2 (en) | 1987-12-07 |
Family
ID=12801959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4839081A Granted JPS57164634A (en) | 1981-04-02 | 1981-04-02 | Time division multidirectional communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57164634A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5977338A (en) * | 1982-10-26 | 1984-05-02 | Kanai Hiroyuki | Quick abrasion testing device for metal card clothing |
-
1981
- 1981-04-02 JP JP4839081A patent/JPS57164634A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5977338A (en) * | 1982-10-26 | 1984-05-02 | Kanai Hiroyuki | Quick abrasion testing device for metal card clothing |
Also Published As
Publication number | Publication date |
---|---|
JPS6258578B2 (en) | 1987-12-07 |
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