FR2262883A1 - Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period - Google Patents

Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Info

Publication number
FR2262883A1
FR2262883A1 FR7407063A FR7407063A FR2262883A1 FR 2262883 A1 FR2262883 A1 FR 2262883A1 FR 7407063 A FR7407063 A FR 7407063A FR 7407063 A FR7407063 A FR 7407063A FR 2262883 A1 FR2262883 A1 FR 2262883A1
Authority
FR
France
Prior art keywords
modulation
numerical
transmission period
demodulation device
amplitude
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
FR7407063A
Other languages
French (fr)
Other versions
FR2262883B1 (en
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7407063A priority Critical patent/FR2262883A1/en
Publication of FR2262883A1 publication Critical patent/FR2262883A1/en
Application granted granted Critical
Publication of FR2262883B1 publication Critical patent/FR2262883B1/fr
Granted 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
    • H04L27/3494—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems using non - square modulating pulses, e.g. using raised cosine pulses; Partial response QAM, i.e. with partial response pulse shaping
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • 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
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
    • H04L27/3827—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using only the demodulated baseband signals

Landscapes

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

Abstract

The circuit provides modulation and demodulation of high frequency signals in binary form. The basic circuit consists of two carrier amplitude modulators suppressing or receiving respectively two R.F. waves in quadrature, and two modulating pulse sources providing two signal t trains representing the binary form. The pulses representing the two possible bit values have an amplitude based on a bit value of zero and are governed by continuous functions F(t) and -F(t) each having a unique polarity, F(t) varying between t=-T and t = O and is in the form of given cosine function. The circuit also employes a reference phase signal derived from the amplitude modulation and the total signal.
FR7407063A 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period Granted FR2262883A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7407063A FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7407063A FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Publications (2)

Publication Number Publication Date
FR2262883A1 true FR2262883A1 (en) 1975-09-26
FR2262883B1 FR2262883B1 (en) 1977-09-16

Family

ID=9135681

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7407063A Granted FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Country Status (1)

Country Link
FR (1) FR2262883A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472876A1 (en) * 1979-12-31 1981-07-03 Bic Jean Claude MODULATOR-DEMODULATOR FOR DUAL MODULATION TRANSMISSION OF FOUR-LEVEL AMPLITUDE ON QUADRATURE CARRIERS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472876A1 (en) * 1979-12-31 1981-07-03 Bic Jean Claude MODULATOR-DEMODULATOR FOR DUAL MODULATION TRANSMISSION OF FOUR-LEVEL AMPLITUDE ON QUADRATURE CARRIERS
EP0031762A2 (en) * 1979-12-31 1981-07-08 Jean-Claude Bic Modulator-demodulator for transmission by a four-level double amplitude modulation on quadrature carriers
EP0031762A3 (en) * 1979-12-31 1981-07-29 Jean-Claude Bic Modulator-demodulator for transmission by a four-level double amplitude modulation on quadrature carriers

Also Published As

Publication number Publication date
FR2262883B1 (en) 1977-09-16

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