JPS55120230A - Frequency characteristic presumption circuit - Google Patents

Frequency characteristic presumption circuit

Info

Publication number
JPS55120230A
JPS55120230A JP2042679A JP2042679A JPS55120230A JP S55120230 A JPS55120230 A JP S55120230A JP 2042679 A JP2042679 A JP 2042679A JP 2042679 A JP2042679 A JP 2042679A JP S55120230 A JPS55120230 A JP S55120230A
Authority
JP
Japan
Prior art keywords
imaginary
real
outputs
correlator
discriminator
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
JP2042679A
Other languages
Japanese (ja)
Other versions
JPS6224981B2 (en
Inventor
Junji Namiki
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 JP2042679A priority Critical patent/JPS55120230A/en
Publication of JPS55120230A publication Critical patent/JPS55120230A/en
Publication of JPS6224981B2 publication Critical patent/JPS6224981B2/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

Abstract

PURPOSE:To price low a unit by making it possible to equalize transmission line distortion automatically by presuming uneven characteristics by the polarity of a real number part and sloping characteristics by that of an imaginary number part by employing constitution including a correlator and discriminator. CONSTITUTION:From input terminal 100, complex sampled value S(t-T) consisting of real-number and imaginary-number parts is inputted, and inverters 17 and 18 output complex conjugate sampled values S*(t-T) and S*(t-T) respectively; and complex adder 6 outputs difference value E(t) and at the outputs of digital LPF7, 8, correlations C(-T) and C(+T) between S*(t-T) and E(t), and S*(t+T) and E(t) appear. Therefore, block 500 constitutes on the whole a correlator which outputs C(-T) and C(+T), and block 600 a discriminator which discriminates respective characteristics of the real-number and imaginary-number parts of C(-T) and C(+T). Into the above-mentioned consititution, an equalizer can be introduced which can freely equalize linear sloping characteristics and uneven characteristics, i.e., characteristic distortion, so that the transmission line distortion can automatically be equalized by controlling it.
JP2042679A 1979-02-22 1979-02-22 Frequency characteristic presumption circuit Granted JPS55120230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2042679A JPS55120230A (en) 1979-02-22 1979-02-22 Frequency characteristic presumption circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2042679A JPS55120230A (en) 1979-02-22 1979-02-22 Frequency characteristic presumption circuit

Publications (2)

Publication Number Publication Date
JPS55120230A true JPS55120230A (en) 1980-09-16
JPS6224981B2 JPS6224981B2 (en) 1987-06-01

Family

ID=12026702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2042679A Granted JPS55120230A (en) 1979-02-22 1979-02-22 Frequency characteristic presumption circuit

Country Status (1)

Country Link
JP (1) JPS55120230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099113A2 (en) * 1982-07-14 1984-01-25 Nec Corporation Interference cancellation type space diversity system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099113A2 (en) * 1982-07-14 1984-01-25 Nec Corporation Interference cancellation type space diversity system

Also Published As

Publication number Publication date
JPS6224981B2 (en) 1987-06-01

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