JPS6478560A - Demodulator - Google Patents

Demodulator

Info

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
Application number
JP62236490A
Other languages
Japanese (ja)
Inventor
Eisaku Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP62236490A priority Critical patent/JPS6478560A/en
Priority to CA000577880A priority patent/CA1278610C/en
Priority to US07/246,863 priority patent/US4864244A/en
Priority to DE3889826T priority patent/DE3889826T2/en
Priority to EP88115470A priority patent/EP0308891B1/en
Priority to AU22468/88A priority patent/AU600217B2/en
Publication of JPS6478560A publication Critical patent/JPS6478560A/en
Pending legal-status Critical Current

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.
JP62236490A 1987-09-21 1987-09-21 Demodulator Pending JPS6478560A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990867A (en) * 1989-05-10 1991-02-05 Kabushiki Kaisha Toshiba Modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990867A (en) * 1989-05-10 1991-02-05 Kabushiki Kaisha Toshiba Modulator

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