GB1519968A - Demodulators - Google Patents

Demodulators

Info

Publication number
GB1519968A
GB1519968A GB36957/75A GB3695775A GB1519968A GB 1519968 A GB1519968 A GB 1519968A GB 36957/75 A GB36957/75 A GB 36957/75A GB 3695775 A GB3695775 A GB 3695775A GB 1519968 A GB1519968 A GB 1519968A
Authority
GB
United Kingdom
Prior art keywords
phase
bits
primary
carrier
reference carrier
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.)
Expired
Application number
GB36957/75A
Other languages
English (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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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
Priority claimed from JP10560774A external-priority patent/JPS5441296B2/ja
Priority claimed from JP50063031A external-priority patent/JPS5912063B2/ja
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB1519968A publication Critical patent/GB1519968A/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
    • 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
    • H04L27/3836—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using the received modulated signal or the received IF signal, e.g. by detecting a pilot or by frequency multiplication
    • 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
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0053—Closed loops
    • H04L2027/0057—Closed loops quadrature phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0053—Closed loops
    • H04L2027/0061—Closed loops remodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB36957/75A 1974-09-12 1975-09-09 Demodulators Expired GB1519968A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10560774A JPS5441296B2 (enExample) 1974-09-12 1974-09-12
JP50063031A JPS5912063B2 (ja) 1975-05-28 1975-05-28 搬送波デイジタル信号受信回路

Publications (1)

Publication Number Publication Date
GB1519968A true GB1519968A (en) 1978-08-02

Family

ID=26404109

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36957/75A Expired GB1519968A (en) 1974-09-12 1975-09-09 Demodulators

Country Status (7)

Country Link
US (1) US4039961A (enExample)
CA (1) CA1076219A (enExample)
DE (1) DE2540836C3 (enExample)
FR (1) FR2285014A1 (enExample)
GB (1) GB1519968A (enExample)
IT (1) IT1042543B (enExample)
NL (1) NL173461C (enExample)

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58698B2 (ja) * 1976-03-22 1983-01-07 日本電気株式会社 位相同期回路
JPS5918900B2 (ja) * 1976-03-22 1984-05-01 日本電気株式会社 復調装置
JPS52142408A (en) * 1976-05-21 1977-11-28 Nec Corp Clock extracting device in double two phase modulation system
JPS5821862B2 (ja) * 1976-11-11 1983-05-04 日本電気株式会社 位相同期回路
JPS5925500B2 (ja) * 1978-03-03 1984-06-18 日本電気株式会社 搬送波再生回路
FR2440660A1 (fr) * 1978-10-31 1980-05-30 Thomson Csf Repeteur hertzien numerique a regeneration et reseau de transmission comportant de tels repeteurs
US4334312A (en) * 1979-08-10 1982-06-08 Nippon Electric Co., Ltd. Phase synchronizing circuit for use in multi-level, multi-phase, superposition-modulated signal transmission system
FR2472876A1 (fr) * 1979-12-31 1981-07-03 Bic Jean Claude Modulateur-demodulateur pour transmission en double modulation d'amplitude a quatre niveaux sur porteuses en quadrature
FR2539261B1 (fr) * 1983-01-07 1989-07-13 Telecommunications Sa Emetteur pour faisceaux hertziens numeriques a multi-etats
US4518922A (en) * 1983-01-17 1985-05-21 Harris Corporation Decision-directed, automatic frequency control technique for non-coherently demodulated M-ARY frequency shift keying
US5237292A (en) * 1992-07-01 1993-08-17 Space Systems/Loral Quadrature amplitude modulation system with compensation for transmission system characteristics
US5717722A (en) * 1994-11-08 1998-02-10 Anritsu Corporation Precision symbol demodulation system for multi-carrier modulation signal
US7151807B2 (en) 2001-04-27 2006-12-19 The Directv Group, Inc. Fast acquisition of timing and carrier frequency from received signal
US7583728B2 (en) 2002-10-25 2009-09-01 The Directv Group, Inc. Equalizers for layered modulated and other signals
US7639759B2 (en) 2001-04-27 2009-12-29 The Directv Group, Inc. Carrier to noise ratio estimations from a received signal
US7471735B2 (en) * 2001-04-27 2008-12-30 The Directv Group, Inc. Maximizing power and spectral efficiencies for layered and conventional modulations
US7184473B2 (en) * 2001-04-27 2007-02-27 The Directv Group, Inc. Equalizers for layered modulated and other signals
US7184489B2 (en) * 2001-04-27 2007-02-27 The Directv Group, Inc. Optimization technique for layered modulation
US8005035B2 (en) 2001-04-27 2011-08-23 The Directv Group, Inc. Online output multiplexer filter measurement
US7502430B2 (en) 2001-04-27 2009-03-10 The Directv Group, Inc. Coherent averaging for measuring traveling wave tube amplifier nonlinearity
US7483505B2 (en) * 2001-04-27 2009-01-27 The Directv Group, Inc. Unblind equalizer architecture for digital communication systems
US7245671B1 (en) 2001-04-27 2007-07-17 The Directv Group, Inc. Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers
US7209524B2 (en) * 2001-04-27 2007-04-24 The Directv Group, Inc. Layered modulation for digital signals
US7822154B2 (en) 2001-04-27 2010-10-26 The Directv Group, Inc. Signal, interference and noise power measurement
US7423987B2 (en) 2001-04-27 2008-09-09 The Directv Group, Inc. Feeder link configurations to support layered modulation for digital signals
US7173981B1 (en) * 2001-04-27 2007-02-06 The Directv Group, Inc. Dual layer signal processing in a layered modulation digital signal system
WO2004040403A2 (en) * 2001-04-27 2004-05-13 The Directv Group, Inc. Lower complexity layered modulation signal processor
US7778365B2 (en) * 2001-04-27 2010-08-17 The Directv Group, Inc. Satellite TWTA on-line non-linearity measurement
US7177371B1 (en) * 2001-12-21 2007-02-13 Nortel Networks Ltd. Methods and apparatus for transmitting and receiving data over a communications network in the presence of interference
US20030118123A1 (en) * 2001-12-21 2003-06-26 Hudson John E. Methods and apparatus for transmitting and receiving data over a communications network in the presence of noise
US7016657B2 (en) * 2002-01-30 2006-03-21 Nokia Corporation Apparatus, and associated method, for communication system utilizing space-generated multilevel coding
EP1540909A4 (en) * 2002-07-01 2007-10-17 Directv Group Inc IMPROVING HIERARCHICAL 8PSK PERFORMANCE
WO2004006455A1 (en) 2002-07-03 2004-01-15 The Directv Group, Inc. Method and apparatus for layered modulation
DE60331766D1 (de) * 2002-10-25 2010-04-29 Directv Group Inc Schätzen des arbeitspunkts eines nichtlinearenausbreitungswellenrührenverstärkers
US7474710B2 (en) 2002-10-25 2009-01-06 The Directv Group, Inc. Amplitude and phase matching for layered modulation reception
US7463676B2 (en) * 2002-10-25 2008-12-09 The Directv Group, Inc. On-line phase noise measurement for layered modulation
US7173977B2 (en) * 2002-10-25 2007-02-06 The Directv Group, Inc. Method and apparatus for tailoring carrier power requirements according to availability in layered modulation systems
US7529312B2 (en) 2002-10-25 2009-05-05 The Directv Group, Inc. Layered modulation for terrestrial ATSC applications
US7496164B1 (en) * 2003-05-02 2009-02-24 At&T Mobility Ii Llc Systems and methods for interference cancellation in a radio receiver system
KR101005036B1 (ko) * 2003-05-16 2010-12-30 톰슨 라이센싱 레이어된 그리고 계층적인 변조 시스템을 위한 통합 수신기
US7502429B2 (en) * 2003-10-10 2009-03-10 The Directv Group, Inc. Equalization for traveling wave tube amplifier nonlinearity measurements
US20050201478A1 (en) * 2004-03-10 2005-09-15 Holger Claussen Modulation in a mobile telecommunications system
CA2582917A1 (en) 2004-09-30 2006-04-13 Viasat, Inc. Frame-based carrier frequency and phase recovery system and method
EP1836821A2 (en) * 2005-01-11 2007-09-26 QUALCOMM Incorporated Methods and apparatus for transmitting layered and non-layered data via layered modulation
US8494082B2 (en) * 2008-05-06 2013-07-23 Electronics And Telecommunications Research Institute Apparatus for transmitting layered data
GB0808886D0 (en) * 2008-05-15 2008-06-25 Cambridge Silicon Radio Ltd Dual purpose modulator
US8665985B1 (en) * 2013-05-29 2014-03-04 Gregory Hubert Piesinger Secondary communication signal method and apparatus
US9602241B2 (en) * 2013-12-17 2017-03-21 Samsung Electronics Co., Ltd. Computing system with polar processing mechanism and method of operation thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745084B2 (enExample) * 1972-12-28 1982-09-25
US3849730A (en) * 1973-06-20 1974-11-19 Bell Telephone Labor Inc Carrier recovery in vestigial sideband data receivers

Also Published As

Publication number Publication date
NL173461B (nl) 1983-08-16
NL173461C (nl) 1984-01-16
DE2540836B2 (de) 1977-09-22
US4039961A (en) 1977-08-02
DE2540836A1 (de) 1976-04-01
FR2285014A1 (fr) 1976-04-09
NL7510728A (nl) 1976-03-16
CA1076219A (en) 1980-04-22
IT1042543B (it) 1980-01-30
DE2540836C3 (de) 1978-05-24
FR2285014B1 (enExample) 1978-12-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19950908