JPS5466762A - Code conversion circuit for 16 value orthogonal amplitude modulation - Google Patents

Code conversion circuit for 16 value orthogonal amplitude modulation

Info

Publication number
JPS5466762A
JPS5466762A JP13369577A JP13369577A JPS5466762A JP S5466762 A JPS5466762 A JP S5466762A JP 13369577 A JP13369577 A JP 13369577A JP 13369577 A JP13369577 A JP 13369577A JP S5466762 A JPS5466762 A JP S5466762A
Authority
JP
Japan
Prior art keywords
bus
signal
terminal
demodulation
code conversion
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
JP13369577A
Other languages
Japanese (ja)
Other versions
JPS5842670B2 (en
Inventor
Tadayoshi Kato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP52133695A priority Critical patent/JPS5842670B2/en
Publication of JPS5466762A publication Critical patent/JPS5466762A/en
Publication of JPS5842670B2 publication Critical patent/JPS5842670B2/en
Expired legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To prevent the variation in the demodulated output of the second bus due to the drawing phase change of the demodulation reference carrier and to reduce the error rate of the second bus, by performing the input signal code conversion of the second bus as specified. CONSTITUTION:The binary data of the first bus P1 is inputted from the terminal IN, it is converted into the difference signal with 4 phase PSK logic SL, and is inputted to the 16 phase modulation circuit 1. The data on the second bus P2 is made for disagreement detection with the SL output. Taking the exclusive logical sum as P1(+)q1=a, p2(+)q2=b, a=1 and b=1, when 1 is added to one terminal of EXOR gate ER13 ER14, P2 signal to other terminal is outputted with inversion and in other case, no inversion is made. Although (0,0) and (1,1) are not subject to this conversion, demodulation is made independently of the drawing phase because of the symmetry to the reference carriers X and Y. After that, input is made to the circuit 1, conversion is made to binary signal with the demodulation 2 of output, the corresponding signal of P1 and P2 is obtained from the terminals OUT and OUT', and the error rate of P2 can be improved.
JP52133695A 1977-11-08 1977-11-08 Communication method using 16-level orthogonal amplitude modulation Expired JPS5842670B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52133695A JPS5842670B2 (en) 1977-11-08 1977-11-08 Communication method using 16-level orthogonal amplitude modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52133695A JPS5842670B2 (en) 1977-11-08 1977-11-08 Communication method using 16-level orthogonal amplitude modulation

Publications (2)

Publication Number Publication Date
JPS5466762A true JPS5466762A (en) 1979-05-29
JPS5842670B2 JPS5842670B2 (en) 1983-09-21

Family

ID=15110708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52133695A Expired JPS5842670B2 (en) 1977-11-08 1977-11-08 Communication method using 16-level orthogonal amplitude modulation

Country Status (1)

Country Link
JP (1) JPS5842670B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112749A (en) * 1982-12-18 1984-06-29 Fujitsu Ltd Differential logical circuit for multivalued orthogonal amplitude modulation
JPS60182246A (en) * 1984-02-06 1985-09-17 コーデツクス・コーポレーシヨン Encoding modulation system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5374306A (en) * 1976-12-15 1978-07-01 Mitsubishi Electric Corp Differential coding system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5374306A (en) * 1976-12-15 1978-07-01 Mitsubishi Electric Corp Differential coding system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112749A (en) * 1982-12-18 1984-06-29 Fujitsu Ltd Differential logical circuit for multivalued orthogonal amplitude modulation
JPS60182246A (en) * 1984-02-06 1985-09-17 コーデツクス・コーポレーシヨン Encoding modulation system
JPH0356500B2 (en) * 1984-02-06 1991-08-28

Also Published As

Publication number Publication date
JPS5842670B2 (en) 1983-09-21

Similar Documents

Publication Publication Date Title
GB1210445A (en) Device for the transmission of synchronous pulse signals
GB1041765A (en) Method and apparatus for the transmission of intelligence
US3826990A (en) Anti phase-ambiguity for phase-shift keying binary transmission systems
GB1105447A (en) Improvements in or relating to telegraph demodulation
JPS5466762A (en) Code conversion circuit for 16 value orthogonal amplitude modulation
ATE50427T1 (en) DIGITAL DEMODULATOR.
JPH01194552A (en) Phase error signal generating circuit arrangement
Belavkin et al. Optimization of processing of quantum signals according to an information criterion
US3377560A (en) Direct data sample single tone receiver
GB1117724A (en) Processes and devices for the demodulation of carrier waves phase modulated by telegraphic signals and the like
GB1518006A (en) Frequency-selective signal receiver
JPS5573164A (en) Synchronous demodulation system of msk signal
JPS5531360A (en) Demodulator circuit
GB1370379A (en) Logic apparatus including exclusive-or circuits
GB1179307A (en) Encoding Binary Information Signals.
JPS6460046A (en) Fsk demodulating circuit
SU1019655A1 (en) Device for receiving binary signals
JPS55149554A (en) Carrier reproducing circuit
GB862281A (en) Parity bit generator
SU495765A1 (en) Shaping device
CN116599522A (en) Quadrature demodulation clock generation circuit
JPS5464961A (en) Carrier wave regenerator circuit
JPS5558649A (en) Error rate monitor unit
JPS5490918A (en) Transfer system of asynchronous serial data signal
JPS5464959A (en) Cycle slipping correcting method