JPS5491120A - Psk demodulation system for diversity receiving - Google Patents
Psk demodulation system for diversity receivingInfo
- Publication number
- JPS5491120A JPS5491120A JP15938377A JP15938377A JPS5491120A JP S5491120 A JPS5491120 A JP S5491120A JP 15938377 A JP15938377 A JP 15938377A JP 15938377 A JP15938377 A JP 15938377A JP S5491120 A JPS5491120 A JP S5491120A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- phase
- signal
- intermediate frequency
- psk
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To improve C/N (the ratio of signals to noise) by making phases of two PSK demodulating carriers in-phase in a PSK demodulator for quadruple diversity receiving. CONSTITUTION:Two signals which were subjected to frequency diversity are converted to the first intermediate frequency of the same frequency and are synthesized in the same phase to become signals fic and f'ic. Synthesized signal fic becomes the second intermediate frequency signal fica in mixer 10 by oscillated signals of VCO 19, and meanwhile, synthesized signal f'ic is mixed with the signal of local oscillator 16 in mixer 10' and becomes the second intermediate frequency signal. Two second intermediate frequency signals are applied to phase detector 17, and the difference between two signals is detected to feed back the detection signal to VCO 19, and both signals are made in-phase. Both in-phase signals are applied to carrier synthesizer 18 and become carriers applied to PSK demodulators 14 and 14'. Output data signals of demodulators 14 and 14' are sunthesized in combiner 15, thereby constituting a quadruple diversity system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15938377A JPS5491120A (en) | 1977-12-28 | 1977-12-28 | Psk demodulation system for diversity receiving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15938377A JPS5491120A (en) | 1977-12-28 | 1977-12-28 | Psk demodulation system for diversity receiving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5491120A true JPS5491120A (en) | 1979-07-19 |
Family
ID=15692594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15938377A Pending JPS5491120A (en) | 1977-12-28 | 1977-12-28 | Psk demodulation system for diversity receiving |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5491120A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61198825A (en) * | 1985-02-20 | 1986-09-03 | Kokusai Electric Co Ltd | Diversity reception method by s/n selection of broadcast data signal |
-
1977
- 1977-12-28 JP JP15938377A patent/JPS5491120A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61198825A (en) * | 1985-02-20 | 1986-09-03 | Kokusai Electric Co Ltd | Diversity reception method by s/n selection of broadcast data signal |
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