NO942533L - Modulasjonsmetode med liten omhyllingsvariasjon for mobilradio - Google Patents

Modulasjonsmetode med liten omhyllingsvariasjon for mobilradio

Info

Publication number
NO942533L
NO942533L NO942533A NO942533A NO942533L NO 942533 L NO942533 L NO 942533L NO 942533 A NO942533 A NO 942533A NO 942533 A NO942533 A NO 942533A NO 942533 L NO942533 L NO 942533L
Authority
NO
Norway
Prior art keywords
transmitted
envelope curve
variations
power
mobile radio
Prior art date
Application number
NO942533A
Other languages
English (en)
Other versions
NO942533D0 (no
Inventor
Rajaram Ramesh
Original Assignee
Ericsson Ge Mobile Communicat
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 Ericsson Ge Mobile Communicat filed Critical Ericsson Ge Mobile Communicat
Publication of NO942533D0 publication Critical patent/NO942533D0/no
Publication of NO942533L publication Critical patent/NO942533L/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding

Landscapes

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

Abstract

Et digitalt radiokommunikasjonssystem oppnår små Variasjoner av effekten i omhyllingskurven til et utsendt signal ved å kode digital informasjon som fasevinkeldifferanser i et overført (sendt) radiosignal og ved å innskrenke den maksimalt mulige fasevinkeldifferansen. Denne reduksjonen av variasjoner i omhyllingskurven letter linearitetskravene for et ønsket nivå av forvrengningsundertrykking til RF-forsterkermidler (RF radiofrekvens) benyttet til å overføre radiosignalet. I tillegg medfører lavere variasjoner i omhyllingskurven en høyere midlere utsendt effekt for en gitt maksimal utsendt effekt, slik at både rekkevidde og batterienes levetid forlenges.
NO942533A 1993-07-06 1994-07-05 Modulasjonsmetode med liten omhyllingsvariasjon for mobilradio NO942533L (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/086,797 US5600676A (en) 1993-07-06 1993-07-06 Modulation scheme with low envelope variation for mobile radio by constraining a maximum modulus of a differential phase angle

Publications (2)

Publication Number Publication Date
NO942533D0 NO942533D0 (no) 1994-07-05
NO942533L true NO942533L (no) 1995-01-09

Family

ID=22200993

Family Applications (1)

Application Number Title Priority Date Filing Date
NO942533A NO942533L (no) 1993-07-06 1994-07-05 Modulasjonsmetode med liten omhyllingsvariasjon for mobilradio

Country Status (4)

Country Link
US (1) US5600676A (no)
EP (1) EP0633681A1 (no)
JP (1) JPH07154438A (no)
NO (1) NO942533L (no)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5642384A (en) * 1993-07-06 1997-06-24 Ericsson Inc. Trellis coded modulation scheme with low envelope variation for mobile radio by constraining a maximum modulus of a differential phase angle
JP2746152B2 (ja) * 1994-11-07 1998-04-28 日本電気株式会社 歪補償回路
US5696794A (en) * 1996-04-04 1997-12-09 Motorola, Inc. Method and apparatus for conditioning digitally modulated signals using channel symbol adjustment
FR2767002B1 (fr) * 1997-08-04 1999-10-08 Matra Communication Procede de modulation numerique, et modulateur mettant en oeuvre un tel procede
US6459742B1 (en) * 1997-08-04 2002-10-01 Eads Defence And Security Networks Digital modulation process and modulator implementing the process
US6104761A (en) * 1998-08-28 2000-08-15 Sicom, Inc. Constrained-envelope digital-communications transmission system and method therefor
US6366619B1 (en) 1998-08-28 2002-04-02 Sicom, Inc. Constrained-envelope transmitter and method therefor
WO2002073918A1 (en) * 2001-03-12 2002-09-19 Telefonaktiebolaget Lm Ericsson (Publ) Dpsk scheme with adaptive transition angle range
US6999522B2 (en) 2001-09-28 2006-02-14 Intersil Americas, Inc. Constrained-envelope digital communications transmitter and method therefor
US6928121B2 (en) 2001-09-28 2005-08-09 Intersil Americas, Inc. Digital transmitter with constrained envelope and spectral regrowth over a plurality of carriers
ATE514233T1 (de) * 2002-03-19 2011-07-15 Powerwave Technologies Inc System und verfahren zum beseitigen von signalnulldurchgängen in einzel- und mehrfachkanalkommunikationssystemen
JP5207517B2 (ja) * 2005-10-14 2013-06-12 三菱電機株式会社 ディジタル変調方法、ディジタル変調回路、ディジタル復調回路、およびディジタル伝送システム
EP2381634A1 (en) * 2010-04-20 2011-10-26 BAE Systems PLC RF modulation and demodulation
WO2011131961A1 (en) * 2010-04-20 2011-10-27 Bae Systems Plc Rf modulation and demodulation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323731A (en) * 1978-12-18 1982-04-06 Harris Corporation Variable-angle, multiple channel amplitude modulation system
AU589119B2 (en) * 1984-04-17 1989-10-05 Nec Corporation Digital radio communication system utilizing quadrature modulated carrier waves
US5394440A (en) * 1991-02-06 1995-02-28 General Datacomm, Inc. High speed modem systems incorporating distribution preserving Tomlinson encoding and decoding for secondary channels
US5311552A (en) * 1992-06-15 1994-05-10 General Electric Company Trellis coding technique to improve adjacent channel interference protection ratio in land mobile radio systems
US5311553A (en) * 1992-06-15 1994-05-10 General Electric Company Trellis coding technique to increase adjacent channel interference protection ratio in land mobile radio systems under peak power constraints
US5418798A (en) * 1993-04-09 1995-05-23 At&T Corp. Multidimensional trellis-coded communication system

Also Published As

Publication number Publication date
JPH07154438A (ja) 1995-06-16
NO942533D0 (no) 1994-07-05
US5600676A (en) 1997-02-04
EP0633681A1 (en) 1995-01-11

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