JPS64844A - C/n measuring circuit - Google Patents
C/n measuring circuitInfo
- Publication number
- JPS64844A JPS64844A JP15604587A JP15604587A JPS64844A JP S64844 A JPS64844 A JP S64844A JP 15604587 A JP15604587 A JP 15604587A JP 15604587 A JP15604587 A JP 15604587A JP S64844 A JPS64844 A JP S64844A
- Authority
- JP
- Japan
- Prior art keywords
- data
- error correction
- signal
- point position
- encoding
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE: To measure accurate C/N by restoring a data string approximating transmission data on the transmission side and using this data string as data which discriminates a signal point position as the reference.
CONSTITUTION: On the reception side, an A/D converter 1 samples a demodulated signal at the timing of a symbol clock reproduced at the time of demodulation and converts each sample value to digital time series data consisting of n-number of quantizing bits. An error correcting and decoding circuit 3 subjects the output of the A/D converter 1 to the error correction and decoding processing, and transmission data before error correction and encoding is restored and is subjected to the error correction and encoding processing in an error correction and encoding circuit 4 and is inputted to one input of a code converting circuit 5. When the decoded signal is related to the digital signal, the code converting circuit 5 discriminates the signal point position in accordance with decision data and performs the operation to turn back to the value of probability density distribution based on the signal point position.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15604587A JPS64844A (en) | 1987-06-23 | 1987-06-23 | C/n measuring circuit |
CA000570052A CA1332450C (en) | 1987-06-23 | 1988-06-22 | Carrier-to-noise detector for digital transmission systems |
EP92201171A EP0497433B1 (en) | 1987-06-23 | 1988-06-22 | Phase controlled demodulation system for digital communication |
EP88305685A EP0296822B1 (en) | 1987-06-23 | 1988-06-22 | Carrier-to-noise detector for digital transmission systems |
AU18248/88A AU594621B2 (en) | 1987-06-23 | 1988-06-22 | Carrier-to-noise detector for digital transmission systems |
DE3854505T DE3854505T2 (en) | 1987-06-23 | 1988-06-22 | Phase-controlled demodulation device for digital communication. |
DE3886107T DE3886107T2 (en) | 1987-06-23 | 1988-06-22 | Carrier / noise detector for digital transmission systems. |
US07/210,653 US4835790A (en) | 1987-06-23 | 1988-06-23 | Carrier-to-noise detector for digital transmission systems |
CA000616675A CA1333922C (en) | 1987-06-23 | 1993-07-22 | Phase controlled demodulation system for digital communication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15604587A JPS64844A (en) | 1987-06-23 | 1987-06-23 | C/n measuring circuit |
Publications (3)
Publication Number | Publication Date |
---|---|
JPH01844A JPH01844A (en) | 1989-01-05 |
JPS64844A true JPS64844A (en) | 1989-01-05 |
JPH0479496B2 JPH0479496B2 (en) | 1992-12-16 |
Family
ID=15619114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15604587A Granted JPS64844A (en) | 1987-06-23 | 1987-06-23 | C/n measuring circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS64844A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4955965A (en) * | 1988-12-05 | 1990-09-11 | Xerox Corporation | Positive drive, passive, sheet rotation device using differential roll velocities |
-
1987
- 1987-06-23 JP JP15604587A patent/JPS64844A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4955965A (en) * | 1988-12-05 | 1990-09-11 | Xerox Corporation | Positive drive, passive, sheet rotation device using differential roll velocities |
Also Published As
Publication number | Publication date |
---|---|
JPH0479496B2 (en) | 1992-12-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071216 Year of fee payment: 15 |