JPS573440A - Adaptive equalizer - Google Patents

Adaptive equalizer

Info

Publication number
JPS573440A
JPS573440A JP7742180A JP7742180A JPS573440A JP S573440 A JPS573440 A JP S573440A JP 7742180 A JP7742180 A JP 7742180A JP 7742180 A JP7742180 A JP 7742180A JP S573440 A JPS573440 A JP S573440A
Authority
JP
Japan
Prior art keywords
circuit
equalizer
inputted
polyphase
value
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
Application number
JP7742180A
Other languages
Japanese (ja)
Other versions
JPS641982B2 (en
Inventor
Fumio Akashi
Kojiro Watanabe
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
Nippon Electric Co Ltd
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7742180A priority Critical patent/JPS573440A/en
Publication of JPS573440A publication Critical patent/JPS573440A/en
Publication of JPS641982B2 publication Critical patent/JPS641982B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03038—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a non-recursive structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To make a drawing-in range broad while making convergence possible even in greater initial interference between codes, by comparing a demodulated waveform value of two series of a received polyphase and multivalue modulation with a prescribed value, and changing the characteristic of an equalizer through the discrimination of polyphase only when it is greater than the rescribed value. CONSTITUTION:The demodulated waveform of two series of polyphase and multivalue modulation is outputted with 2 series of signals by an input to an equalizer 3 from terminals 1, 2, and the output is branched into three and it is inputted to an evaluating value calculation circuit 4 and the evaluating value is inputted to a comparison circuit 8. where it is compared with a prescribed value inputted from a terminal 7, and when the input from a circuit 4 is greater, 1 is outputted to a discriminating circuit 5 and, when smaller, 0 is outputted. Further, only when the circuit 5 inputs 1, it decides that the received waveform is distributed in the range where the decision of the polyphase modulation is made accurate. The output is inputted to a correction circuit 6 according to the output of the equalizer 3. Next, the circuit 6 outputs a signal to change the characteristic of the equalizer 3, allowing to make adaptive the equalization of wider drawing-n range.
JP7742180A 1980-06-09 1980-06-09 Adaptive equalizer Granted JPS573440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7742180A JPS573440A (en) 1980-06-09 1980-06-09 Adaptive equalizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7742180A JPS573440A (en) 1980-06-09 1980-06-09 Adaptive equalizer

Publications (2)

Publication Number Publication Date
JPS573440A true JPS573440A (en) 1982-01-08
JPS641982B2 JPS641982B2 (en) 1989-01-13

Family

ID=13633490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7742180A Granted JPS573440A (en) 1980-06-09 1980-06-09 Adaptive equalizer

Country Status (1)

Country Link
JP (1) JPS573440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58198928A (en) * 1982-04-28 1983-11-19 ノーザン・テレコム・リミテツド Method and device for controlling slope compensation of intermediate frequency

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0483680U (en) * 1990-11-29 1992-07-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58198928A (en) * 1982-04-28 1983-11-19 ノーザン・テレコム・リミテツド Method and device for controlling slope compensation of intermediate frequency

Also Published As

Publication number Publication date
JPS641982B2 (en) 1989-01-13

Similar Documents

Publication Publication Date Title
JPS5596750A (en) Adaptive signal discrimination unit
EP0192411A3 (en) Adaptive equalizer
US5673288A (en) System and method for adaptive maximum likelihood sequence estimation
CA2022153A1 (en) Modulator and demodulator for data transmission systems
IE42621L (en) Digital receiver
JPS56111331A (en) Two-dimentionally applied type automatic equalizer
JPS5757022A (en) Automatic equalizer
JPS57142040A (en) Variable equalizing system
SU1059674A1 (en) Frequency corrector
JPS6218120A (en) Adaptive automatic equalizer
JPS5797737A (en) Nonlinear equalizer
JPS5647144A (en) Signal discriminator
JPS5552646A (en) Odd multilevel adaptive automatic equalizer
SU1067605A1 (en) Adaptive corrector of intersymbol distortions
JPS5789362A (en) Automatic adjusting circuit for discrimination level
JPS5675731A (en) Automatic equalizer
SU1128371A2 (en) Device for adjusting signal level
JPS5779772A (en) Fadar circuit
JPS57111134A (en) Intersymbol interference compensating circuit
JPS56166481A (en) Deciding method of earthquake
JPH05268108A (en) Waveform equalizer
JPS564957A (en) Bus circuit
JPS56116338A (en) Automatic equalizer
JPS5711542A (en) Automatic equalizer
JPS56160119A (en) Equalizing circuit of level ratio between video and voice