GB2282942A - DC tracking circuit for ginomy data slicer - Google Patents

DC tracking circuit for ginomy data slicer

Info

Publication number
GB2282942A
GB2282942A GB9425397A GB9425397A GB2282942A GB 2282942 A GB2282942 A GB 2282942A GB 9425397 A GB9425397 A GB 9425397A GB 9425397 A GB9425397 A GB 9425397A GB 2282942 A GB2282942 A GB 2282942A
Authority
GB
United Kingdom
Prior art keywords
signal
switch
received
transceiver
ginomy
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
GB9425397A
Other versions
GB2282942B (en
GB9425397D0 (en
Inventor
David James Mccabe
Stephen Akira Williams
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.)
Lucent Technologies Wireless Ltd
Original Assignee
AT&T Wireless Communications Products 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 AT&T Wireless Communications Products Ltd filed Critical AT&T Wireless Communications Products Ltd
Publication of GB9425397D0 publication Critical patent/GB9425397D0/en
Publication of GB2282942A publication Critical patent/GB2282942A/en
Application granted granted Critical
Publication of GB2282942B publication Critical patent/GB2282942B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/065—Binary decisions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only

Landscapes

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

Abstract

In a transceiver (1) forming part of a digital communications system, there is described a system for data recovery from the demodulated analogue signal, said system comprising a slicer circuit (6) for extracting the digital data from the analogue signal and a low pass filter (9) for generating, from the input analogue signal (5), a threshold signal for use in the operation of said slicer circuit (6). The low pass filter (9) has a variable time constant, selected by a switch (5), to alter the rate of change of the threshold level in accordance with the position of the switch. The switch is itself controlled by a composite control signal (16) output from a gate (10) and indicative of two properties of the received R.F. signal, namely the received signal strength (RSSI) and the state of synchronisation. The arrangement is such that a high rate of change of threshold level is permitted only if the transceiver is not synchronised and the received signal strength is above a predetermined level. <IMAGE>
GB9425397A 1992-06-10 1993-06-09 DC tracking circuit for ginomy data slicer Expired - Fee Related GB2282942B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929212263A GB9212263D0 (en) 1992-06-10 1992-06-10 System for data recovery
PCT/GB1993/001226 WO1993026110A1 (en) 1992-06-10 1993-06-09 Dc tracking circuit for ginomy data slicer

Publications (3)

Publication Number Publication Date
GB9425397D0 GB9425397D0 (en) 1995-02-15
GB2282942A true GB2282942A (en) 1995-04-19
GB2282942B GB2282942B (en) 1996-01-24

Family

ID=10716826

Family Applications (2)

Application Number Title Priority Date Filing Date
GB929212263A Pending GB9212263D0 (en) 1992-06-10 1992-06-10 System for data recovery
GB9425397A Expired - Fee Related GB2282942B (en) 1992-06-10 1993-06-09 DC tracking circuit for ginomy data slicer

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB929212263A Pending GB9212263D0 (en) 1992-06-10 1992-06-10 System for data recovery

Country Status (4)

Country Link
EP (1) EP0645066A1 (en)
AU (1) AU4344393A (en)
GB (2) GB9212263D0 (en)
WO (1) WO1993026110A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872468A (en) * 1997-06-12 1999-02-16 Northern Telecom Limited Level detector circuit, interface and method for interpreting and processing multi-level signals
GB2333214A (en) 1998-01-09 1999-07-14 Mitel Semiconductor Ltd Data slicer
CN1559127A (en) * 2001-10-10 2004-12-29 ����ɭ�绰�ɷ����޹�˾ Receiver with adaptive detection threshold for TDMA communication
CN103516366B (en) * 2013-09-26 2017-01-18 中科院微电子研究所昆山分所 Input signal intensity indicator and indicating method
JP6626362B2 (en) * 2016-02-19 2019-12-25 アズビル株式会社 Filter time constant changing circuit and D / A conversion circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318128A (en) * 1979-07-17 1982-03-02 Thomson-Csf Process and device for retrieving digital data in the presence of noise and distortions
US4821292A (en) * 1987-06-03 1989-04-11 General Electric Company Adaptive limiter/detector which changes time constant upon detection of dotting pattern
EP0400854A2 (en) * 1989-05-26 1990-12-05 Motorola, Inc. Data centering method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318128A (en) * 1979-07-17 1982-03-02 Thomson-Csf Process and device for retrieving digital data in the presence of noise and distortions
US4821292A (en) * 1987-06-03 1989-04-11 General Electric Company Adaptive limiter/detector which changes time constant upon detection of dotting pattern
EP0400854A2 (en) * 1989-05-26 1990-12-05 Motorola, Inc. Data centering method and apparatus

Also Published As

Publication number Publication date
GB2282942B (en) 1996-01-24
WO1993026110A1 (en) 1993-12-23
GB9212263D0 (en) 1992-07-22
EP0645066A1 (en) 1995-03-29
AU4344393A (en) 1994-01-04
GB9425397D0 (en) 1995-02-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090609