JPS5489516A - Radio communication system - Google Patents
Radio communication systemInfo
- Publication number
- JPS5489516A JPS5489516A JP15882577A JP15882577A JPS5489516A JP S5489516 A JPS5489516 A JP S5489516A JP 15882577 A JP15882577 A JP 15882577A JP 15882577 A JP15882577 A JP 15882577A JP S5489516 A JPS5489516 A JP S5489516A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- amplitude
- output
- detector
- supplied
- 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.)
- Pending
Links
Abstract
PURPOSE: To make it possible to improve the efficiency of the utilization of a frequency even on a system which uses a carrier relatively low in frequency stability, by amplitude-modulating a radio carrier by a time-division multiple system.
CONSTITUTION: As output signals from terminal apparatus 28 (for example, a digitized telephone set), signal pnlse string (e) and clock pulse string (d) are both supplied to primary modulator 26 and subcarrier 27 (b) is phase-converted (c), for example, and then supplied to main modulator 24, where a carrier (frequency fc = fu = an upward-circuit frequency) from main modulator 24 is amplitude-modulated (a) by its subcarrier, so that its output will be transmitted to center station 1 by way of output circuit 23, antenna common-use unit 22 and antenna 12. On the other hand, radio waves emitted at transmission frequency (fD) from center station 1 change into a code output by passing through antenna 12 of terminal station 2, common-use unit 22, 1st detector 29 detecting an amplitude-modulated wave, and 2nd detector 30 detecting a phase-modulated wave and then supplied to apparatus 28. The demodulation output of detector 29 composed of a peak detector circuit, etc., has relations only to amplitude and is under no influence of frequency stability.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15882577A JPS5489516A (en) | 1977-12-27 | 1977-12-27 | Radio communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15882577A JPS5489516A (en) | 1977-12-27 | 1977-12-27 | Radio communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5489516A true JPS5489516A (en) | 1979-07-16 |
Family
ID=15680195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15882577A Pending JPS5489516A (en) | 1977-12-27 | 1977-12-27 | Radio communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5489516A (en) |
-
1977
- 1977-12-27 JP JP15882577A patent/JPS5489516A/en active Pending
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