JPS6478560A - Demodulator - Google Patents
DemodulatorInfo
- Publication number
- JPS6478560A JPS6478560A JP62236490A JP23649087A JPS6478560A JP S6478560 A JPS6478560 A JP S6478560A JP 62236490 A JP62236490 A JP 62236490A JP 23649087 A JP23649087 A JP 23649087A JP S6478560 A JPS6478560 A JP S6478560A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- response
- qam
- qam system
- channel
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To improve the amplitude gain control characteristic with a simple constitution by generating a data signal and an error signal respectively by using only respective signals in I channel system and Q channel system in order to control amplitude gain for a demodulated signal. CONSTITUTION:A received signal 101 modulated based on SS-QAM system that is inputted to an input terminal 6 is inputted to a QAM demodulator 1 where the signal is subjected to synchronization detection, and an I-channel demodulated signal 102 and a Q-channel demodulated signal 102' crossing with each other orthogonally are outputted. The signals 102, 102' are respectively inputted to amplitude gain controller 2, 2'. Signal converters 11, 11' respectively process a signal so that the amplitude level value of a signal in response to a signal point in SS-QAM system comes equal to the amplitude level value of a signal in response to a correspondent signal point in C-QAM system, and the amplitude level value of a signal in response to a signal point disposed in outmost position in SS-QAM system that cannot be correspondent to the signal point disposition in the C-QAM system comes equal to that of a signal in response to a signal point disposed in the outmost position in the C-QAM system.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62236490A JPS6478560A (en) | 1987-09-21 | 1987-09-21 | Demodulator |
CA000577880A CA1278610C (en) | 1987-09-21 | 1988-09-20 | Stepped square-qam demodulator utilizing all signal points to generate control signals |
US07/246,863 US4864244A (en) | 1987-09-21 | 1988-09-20 | Stepped square-QAM demodulator utilizing all signal points to generate control signals |
DE3889826T DE3889826T2 (en) | 1987-09-21 | 1988-09-21 | Stair-shaped QAM demodulator using all signal points to generate control signals. |
EP88115470A EP0308891B1 (en) | 1987-09-21 | 1988-09-21 | Stepped square-QAM demodulator utilizing all signal points to generate control signals |
AU22468/88A AU600217B2 (en) | 1987-09-21 | 1988-09-21 | Stepped square-qam demodulator utilizing all signal points to generate control signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62236490A JPS6478560A (en) | 1987-09-21 | 1987-09-21 | Demodulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6478560A true JPS6478560A (en) | 1989-03-24 |
Family
ID=17001502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62236490A Pending JPS6478560A (en) | 1987-09-21 | 1987-09-21 | Demodulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6478560A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4990867A (en) * | 1989-05-10 | 1991-02-05 | Kabushiki Kaisha Toshiba | Modulator |
-
1987
- 1987-09-21 JP JP62236490A patent/JPS6478560A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4990867A (en) * | 1989-05-10 | 1991-02-05 | Kabushiki Kaisha Toshiba | Modulator |
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