KR20000040740A - Gain control signal generating device of multi level demodulator - Google Patents

Gain control signal generating device of multi level demodulator Download PDF

Info

Publication number
KR20000040740A
KR20000040740A KR1019980056459A KR19980056459A KR20000040740A KR 20000040740 A KR20000040740 A KR 20000040740A KR 1019980056459 A KR1019980056459 A KR 1019980056459A KR 19980056459 A KR19980056459 A KR 19980056459A KR 20000040740 A KR20000040740 A KR 20000040740A
Authority
KR
South Korea
Prior art keywords
signal
gain control
multi level
generating device
signal generating
Prior art date
Application number
KR1019980056459A
Other languages
Korean (ko)
Other versions
KR100311383B1 (en
Inventor
Seok Rae Lee
Original Assignee
Lg Electronics Inc
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 Lg Electronics Inc filed Critical Lg Electronics Inc
Priority to KR1019980056459A priority Critical patent/KR100311383B1/en
Publication of KR20000040740A publication Critical patent/KR20000040740A/en
Application granted granted Critical
Publication of KR100311383B1 publication Critical patent/KR100311383B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4923—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes
    • H04L25/4925—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes using balanced bipolar ternary codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3809—Amplitude regulation arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: A gain control signal generating device of multi level demodulator is provided to minimize influence due to signal even in case of having multi level signal points such as Quadrature Amplitude Modulation(QAM) and control gain only with influence due to noise. CONSTITUTION: A gain control signal generating device of multi level demodulator comprises a signal power calculator(1), an error detector(2), a loop filter(3), a pulse width modulator(4) and a signal/noise divider(10). The calculator(1) outputs signal power from in phase and quadrature phase. The filter(3) is a low pass filter for filtering error components. The modulator(4) modulates the pulse width of the signal filtered in the loop filter to output gain control signals. The divider(10) receives the signal power and divides the power into signal and noise components to output them to the error detector.
KR1019980056459A 1998-12-19 1998-12-19 Apparatus for generating gain control signal of multilevel demodulator KR100311383B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019980056459A KR100311383B1 (en) 1998-12-19 1998-12-19 Apparatus for generating gain control signal of multilevel demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019980056459A KR100311383B1 (en) 1998-12-19 1998-12-19 Apparatus for generating gain control signal of multilevel demodulator

Publications (2)

Publication Number Publication Date
KR20000040740A true KR20000040740A (en) 2000-07-05
KR100311383B1 KR100311383B1 (en) 2001-11-15

Family

ID=19563973

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019980056459A KR100311383B1 (en) 1998-12-19 1998-12-19 Apparatus for generating gain control signal of multilevel demodulator

Country Status (1)

Country Link
KR (1) KR100311383B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382653B1 (en) * 2001-03-28 2003-05-09 삼성전자주식회사 Automatic gain control system for operating based on desired signal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4814719A (en) * 1987-12-14 1989-03-21 Ford Aerospace & Communications Corporation Unsymmetrical QPSK demodulator
JPH0377457A (en) * 1989-08-18 1991-04-03 Mitsubishi Electric Corp Demodulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382653B1 (en) * 2001-03-28 2003-05-09 삼성전자주식회사 Automatic gain control system for operating based on desired signal

Also Published As

Publication number Publication date
KR100311383B1 (en) 2001-11-15

Similar Documents

Publication Publication Date Title
KR920001870A (en) Electronic receiver for receiving modulated carrier signals
RU95122672A (en) METHOD FOR AUTOMATIC ADJUSTMENT OF AMPLIFICATION AND EXCLUSION OF DISPLACEMENT OF THE CONSTANT COMPONENT IN THE RECEIVER WITH SQUARE DEMODULATION AND THE DEVICE FOR ITS IMPLEMENTATION
RU94033150A (en) DEVICE FOR COMPENSATION OF PHASE ROTATION IN THE END OF THE AMPLIFIER
HU9402492D0 (en) Psk demodulator
DE69122139D1 (en) Circuit for reducing the distortion of a high frequency power amplifier
ATE416522T1 (en) GENERATION OF A PHASE LOCKED LOOP SIGNAL WITH REDUCED INTERFERENCE EMISSIONS
CA2198337A1 (en) Frequency spreading clock modulation
GB1105337A (en) Improvements in or relating to single side band modulation systems
DE68923525D1 (en) Digital demodulator system.
KR20000040740A (en) Gain control signal generating device of multi level demodulator
CA2080786A1 (en) Vector fm modulator
KR900008789A (en) Direct Mixed Synchronous AM Receiver
CA2052589A1 (en) Rate conversion apparatus
ES2060536A1 (en) Frequency synthesizer.
EP0325459A3 (en) Digital modulator
CA2314879A1 (en) Digital demodulator
GB1217746A (en) Improvements in or relating to demodulators
EP0445664A3 (en) Circuit arrangement for detecting identification signals
JPS5662407A (en) Phase modulating circuit
JPS57185741A (en) Monitoring device for phase modulator
NZ508806A (en) Feedback amplitude balancing for dual point FSK modulator
JPS57140057A (en) Demodulating system for phase displacement modulation signal
JPH0424669Y2 (en)
DE58904937D1 (en) FREQUENCY MODULATION METHOD AND ARRANGEMENT.
JPS57136810A (en) Frequency modulating system using pll

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20050607

Year of fee payment: 5

LAPS Lapse due to unpaid annual fee