IE900942L - Circuit for detecting a frequency reference signal - Google Patents

Circuit for detecting a frequency reference signal

Info

Publication number
IE900942L
IE900942L IE900942A IE94290A IE900942L IE 900942 L IE900942 L IE 900942L IE 900942 A IE900942 A IE 900942A IE 94290 A IE94290 A IE 94290A IE 900942 L IE900942 L IE 900942L
Authority
IE
Ireland
Prior art keywords
frequency
circuit
burst
reference frequency
data signal
Prior art date
Application number
IE900942A
Other versions
IE63591B1 (en
Inventor
Otmar Ringelhaan
Horst Fenske
Gerhard Eichiner
Original Assignee
Amcur Nv
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 Amcur Nv filed Critical Amcur Nv
Publication of IE900942L publication Critical patent/IE900942L/en
Publication of IE63591B1 publication Critical patent/IE63591B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]

Landscapes

  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Burglar Alarm Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Color Television Systems (AREA)
  • Noise Elimination (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Stereophonic System (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to a circuit for recognising a reference frequency signal which is transmitted with a data signal in time- division multiplex mode. A circuit of this type is provided for mobile radio systems in order to correct the frequency standard of the mobile stations through transmission of a reference frequency from the (fixed) base stations. In order to ascertain the temporal position of a reference frequency signal of this type, a solution is to be described in the implementation of which expensive circuits and high processing speeds are avoided. The invention provides a circuit with two transverse filters (1) which serve to distinguish between the data signal and the FC burst (frequency correction burst). They are designed so that the transmission factor of one filter shows a minimum at the FC frequency, while that of the other shows a maximum at that frequency. A device (2, 3) to determine the absolute value of the filter output signals, an arrangement (4 to 9) to form the sliding mean value over the period of a burst length and a device (10) to form the quotient of the output voltages of both paths are in each case connected downstream from the transverse filters (1). <IMAGE>
IE94290A 1989-03-16 1990-03-15 Circuit for detecting a frequency reference signal IE63591B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89104713 1989-03-16

Publications (2)

Publication Number Publication Date
IE900942L true IE900942L (en) 1990-09-16
IE63591B1 IE63591B1 (en) 1995-05-17

Family

ID=8201095

Family Applications (1)

Application Number Title Priority Date Filing Date
IE94290A IE63591B1 (en) 1989-03-16 1990-03-15 Circuit for detecting a frequency reference signal

Country Status (9)

Country Link
EP (1) EP0387720B1 (en)
AT (1) ATE98070T1 (en)
DE (1) DE59003646D1 (en)
DK (1) DK0387720T3 (en)
ES (1) ES2046564T3 (en)
FI (1) FI901306A0 (en)
IE (1) IE63591B1 (en)
NO (1) NO175696C (en)
PT (1) PT93455B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4127501A1 (en) * 1990-09-07 1992-03-12 Telefunken Systemtechnik METHOD FOR DETECTING THE FREQUENCY STORAGE IN DIGITAL MESSAGE TRANSMISSIONS
WO1992011706A1 (en) * 1990-12-17 1992-07-09 Motorola, Inc. Frequency and time slot synchronization using adaptive filtering
KR100193837B1 (en) * 1996-08-24 1999-06-15 윤종용 Frequency-Calibrated Burst Detection Method of Digital Mobile Communication Systems
JP3462175B2 (en) 1997-09-30 2003-11-05 シーメンス アクチエンゲゼルシヤフト How to search for pilot tones
US6356608B1 (en) * 1998-06-29 2002-03-12 Telefonaktiebolaget Lm Ericsson (Publ) Method, apparatus, and system for determining a location of a frequency synchronization signal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358737A (en) * 1980-10-16 1982-11-09 Motorola, Inc. Digitally controlled bandwidth sampling filter-detector

Also Published As

Publication number Publication date
DK0387720T3 (en) 1994-03-21
PT93455B (en) 1996-05-31
IE63591B1 (en) 1995-05-17
ATE98070T1 (en) 1993-12-15
NO175696B (en) 1994-08-08
ES2046564T3 (en) 1994-02-01
DE59003646D1 (en) 1994-01-13
EP0387720A1 (en) 1990-09-19
FI901306A0 (en) 1990-03-15
NO901170D0 (en) 1990-03-13
NO901170L (en) 1990-09-17
PT93455A (en) 1990-11-07
EP0387720B1 (en) 1993-12-01
NO175696C (en) 1994-11-16

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Legal Events

Date Code Title Description
MM4A Patent lapsed