GB1449723A - Feed-forward error-correcting systems - Google Patents

Feed-forward error-correcting systems

Info

Publication number
GB1449723A
GB1449723A GB856974A GB856974A GB1449723A GB 1449723 A GB1449723 A GB 1449723A GB 856974 A GB856974 A GB 856974A GB 856974 A GB856974 A GB 856974A GB 1449723 A GB1449723 A GB 1449723A
Authority
GB
United Kingdom
Prior art keywords
error
signal
output
input
coupled
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
GB856974A
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.)
AT&T Inc
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1449723A publication Critical patent/GB1449723A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
    • H03F1/3229—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/198—A hybrid coupler being used as coupling circuit between stages of an amplifier circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
GB856974A 1973-03-02 1974-02-26 Feed-forward error-correcting systems Expired GB1449723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00337670A US3815040A (en) 1973-03-02 1973-03-02 Feed-forward, error-correcting systems

Publications (1)

Publication Number Publication Date
GB1449723A true GB1449723A (en) 1976-09-15

Family

ID=23321509

Family Applications (1)

Application Number Title Priority Date Filing Date
GB856974A Expired GB1449723A (en) 1973-03-02 1974-02-26 Feed-forward error-correcting systems

Country Status (9)

Country Link
US (1) US3815040A (cg-RX-API-DMAC7.html)
JP (1) JPS5645322B2 (cg-RX-API-DMAC7.html)
BE (1) BE811759A (cg-RX-API-DMAC7.html)
CA (1) CA989021A (cg-RX-API-DMAC7.html)
DE (1) DE2409842A1 (cg-RX-API-DMAC7.html)
FR (1) FR2220110B1 (cg-RX-API-DMAC7.html)
GB (1) GB1449723A (cg-RX-API-DMAC7.html)
NL (1) NL7402816A (cg-RX-API-DMAC7.html)
SE (1) SE391095B (cg-RX-API-DMAC7.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140654A1 (de) * 1980-10-17 1982-06-24 Nippon Columbia K.K., Tokyo Stromkreis zur verzerrungsbeseitigung
ES2262427A1 (es) * 2005-03-23 2006-11-16 Angel Iglesias, S.A. Sistema para la medicion y monitorizacion de distorsion no lineal en dispositivos de linealizacion.

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906401A (en) * 1974-09-03 1975-09-16 Bell Telephone Labor Inc Feedforward error correction in interferometer modulators
SE385177B (sv) * 1975-08-28 1976-06-08 Ericsson Telefon Ab L M Framkopplad forsterkare
GB1561052A (en) * 1975-09-24 1980-02-13 Siemens Ag Transistor power amplifiers
US3993961A (en) * 1975-10-31 1976-11-23 Bell Telephone Laboratories, Incorporated Overcompensated feedforward method and apparatus using overdistorted main amplifiers
US4028634A (en) * 1976-02-11 1977-06-07 Bell Telephone Laboratories, Incorporated Feed-forward amplifier with simple resistive coupling
JPS52123420U (cg-RX-API-DMAC7.html) * 1976-03-17 1977-09-20
US4207527A (en) * 1978-04-05 1980-06-10 Rca Corporation Pre-processing apparatus for FM stereo overshoot elimination
US4207526A (en) * 1978-04-05 1980-06-10 Rca Corporation Pre-processing apparatus for FM stereo overshoot elimination
DE2915947A1 (de) * 1979-04-20 1980-11-06 Siemens Ag Schaltungsanordnung zur verminderung der amplitudenabhaengigen verzerrungen in ueberlagerungsempfaengern
FR2469826A1 (fr) * 1979-11-14 1981-05-22 Lecoy Pierre Boucle de detection d'erreur notamment pour circuit de correction de linearite
JPS57186155U (cg-RX-API-DMAC7.html) * 1981-05-19 1982-11-26
DE3220252C2 (de) * 1982-05-28 1985-09-12 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Beseitigung von Verzerrungen in Verstärkern
FR2532491A1 (fr) * 1982-08-24 1984-03-02 Thomson Csf Dispositif de linearisation pour amplificateur haute frequence
US5065110A (en) * 1990-05-02 1991-11-12 Teledyne Mec Feed-forward amplifier including phase correction
JPH0496508A (ja) * 1990-08-13 1992-03-27 Nec Corp 歪補償回路
US5077532A (en) * 1990-12-17 1991-12-31 Motorola, Inc. Feed forward distortion minimization circuit
US5119040A (en) * 1991-01-04 1992-06-02 Motorola, Inc. Method and apparatus for optimizing the performance of a power amplifier circuit
US5130663A (en) * 1991-04-15 1992-07-14 Motorola, Inc. Feed forward amplifier network with frequency swept pilot tone
US5307022A (en) * 1991-04-15 1994-04-26 Motorola, Inc. High dynamic range modulation independent feed forward amplifier network
US5304945A (en) * 1993-04-19 1994-04-19 At&T Bell Laboratories Low-distortion feed-forward amplifier
US5623227A (en) * 1995-10-17 1997-04-22 Motorola, Inc. Amplifier circuit and method of controlling an amplifier for use in a radio frequency communication system
US5621354A (en) * 1995-10-17 1997-04-15 Motorola, Inc. Apparatus and method for performing error corrected amplification in a radio frequency system
US5768699A (en) * 1995-10-20 1998-06-16 Aml Communications, Inc. Amplifier with detuned test signal cancellation for improved wide-band frequency response
US5808512A (en) * 1997-01-31 1998-09-15 Ophir Rf, Inc. Feed forward amplifiers and methods
ATE513360T1 (de) * 2000-12-28 2011-07-15 Alcatel Lucent Xdsl klasse c-ab treiber
US6573792B1 (en) * 2001-12-13 2003-06-03 Motorola, Inc Feedforward amplifier
US7355470B2 (en) 2006-04-24 2008-04-08 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including embodiments for amplifier class transitioning
US7327803B2 (en) 2004-10-22 2008-02-05 Parkervision, Inc. Systems and methods for vector power amplification
ITRM20050415A1 (it) * 2005-08-03 2007-02-04 Porra Secondo Apparato amplificatore audio di potenza.
US9106316B2 (en) 2005-10-24 2015-08-11 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification
US8013675B2 (en) 2007-06-19 2011-09-06 Parkervision, Inc. Combiner-less multiple input single output (MISO) amplification with blended control
US7911272B2 (en) 2007-06-19 2011-03-22 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including blended control embodiments
US8031804B2 (en) 2006-04-24 2011-10-04 Parkervision, Inc. Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion
US7937106B2 (en) 2006-04-24 2011-05-03 ParkerVision, Inc, Systems and methods of RF power transmission, modulation, and amplification, including architectural embodiments of same
US8315336B2 (en) 2007-05-18 2012-11-20 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including a switching stage embodiment
US7620129B2 (en) 2007-01-16 2009-11-17 Parkervision, Inc. RF power transmission, modulation, and amplification, including embodiments for generating vector modulation control signals
WO2009005768A1 (en) 2007-06-28 2009-01-08 Parkervision, Inc. Systems and methods of rf power transmission, modulation, and amplification
KR20140026458A (ko) 2011-04-08 2014-03-05 파커비전, 인크. Ｒｆ 전력 송신, 변조 및 증폭 시스템들 및 방법들
KR20140034895A (ko) 2011-06-02 2014-03-20 파커비전, 인크. 안테나 제어
EP4538829A3 (en) 2013-09-17 2025-06-25 Parkervision, Inc. Method, apparatus and system for rendering an information bearing function of time

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835869A (en) * 1955-06-21 1958-05-20 Rca Corp Television transmitter with improved amplitude linearity
GB802218A (en) * 1955-10-21 1958-10-01 Standard Telephones Cables Ltd Circuit for reducing the effect of delay distortion of amplifier systems on angularly modulated waves
DE1010589B (de) * 1956-05-15 1957-06-19 Telefunken Gmbh Senderschaltung mit Amplituden-modulation einer Hochfrequenzschwingung
NL264824A (cg-RX-API-DMAC7.html) * 1961-05-16
US3348126A (en) * 1964-09-25 1967-10-17 Maxime G Kaufman Phase rate compensator
US3365674A (en) * 1964-11-09 1968-01-23 Northern Electric Co Distortion reducing circuit
CA850263A (en) * 1968-10-09 1970-08-25 Northern Electric Company Limited Threshold extension demodulator
US3568078A (en) * 1968-12-23 1971-03-02 Radiation Inc Fm demodulators with signal error removal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140654A1 (de) * 1980-10-17 1982-06-24 Nippon Columbia K.K., Tokyo Stromkreis zur verzerrungsbeseitigung
ES2262427A1 (es) * 2005-03-23 2006-11-16 Angel Iglesias, S.A. Sistema para la medicion y monitorizacion de distorsion no lineal en dispositivos de linealizacion.
ES2262427B1 (es) * 2005-03-23 2007-11-16 Angel Iglesias, S.A. Sistema para la medicion y monitorizacion de distorsion no lineal en dispositivos de linealizacion.

Also Published As

Publication number Publication date
CA989021A (en) 1976-05-11
FR2220110B1 (cg-RX-API-DMAC7.html) 1976-12-10
SE391095B (sv) 1977-01-31
JPS503205A (cg-RX-API-DMAC7.html) 1975-01-14
US3815040A (en) 1974-06-04
JPS5645322B2 (cg-RX-API-DMAC7.html) 1981-10-26
DE2409842A1 (de) 1974-09-12
BE811759A (fr) 1974-07-01
FR2220110A1 (cg-RX-API-DMAC7.html) 1974-09-27
NL7402816A (cg-RX-API-DMAC7.html) 1974-09-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee