IT1250962B - Metodo di sincronizzazione in frequenza ed in finestrelle di tempo mediante filtrazione adattiva. - Google Patents

Metodo di sincronizzazione in frequenza ed in finestrelle di tempo mediante filtrazione adattiva.

Info

Publication number
IT1250962B
IT1250962B ITRM910944A ITRM910944A IT1250962B IT 1250962 B IT1250962 B IT 1250962B IT RM910944 A ITRM910944 A IT RM910944A IT RM910944 A ITRM910944 A IT RM910944A IT 1250962 B IT1250962 B IT 1250962B
Authority
IT
Italy
Prior art keywords
signal
frequency
fcb
filter
packet
Prior art date
Application number
ITRM910944A
Other languages
English (en)
Inventor
Arvind S Arora
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of ITRM910944A0 publication Critical patent/ITRM910944A0/it
Publication of ITRM910944A1 publication Critical patent/ITRM910944A1/it
Application granted granted Critical
Publication of IT1250962B publication Critical patent/IT1250962B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • 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
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2675—Frequency synchronisation
    • 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
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2681—Synchronisation of a mobile station with one base station
    • 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
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L2007/047—Speed or phase control by synchronisation signals using special codes as synchronising signal using a sine signal or unmodulated carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

Il procedimento di sincronizzazione della presente invenzione filtra il segnale ricevuto con un filtro passa banda adattativo (101) mentre il segnale ricevuto viene trattenuto in una memoria (108). Le energie del segnale di ingresso e del segnale filtrato vengono stimate (103 e 104) ed il guadagno del filtro viene adattato (105) sulla base della differenza fra le energie. Il polo del filtro viene adattato (102) in modo da centrare la frequenza del segnale di ingresso nella banda passante del filtro. Se viene rivelato un segnale acustico o tono (106), la lunghezza del segnale acustico viene determinata (107) per accertare se si tratta di un pacchetto di impulsi a correzione di frequenza (FCB). Se il segnale acustico rivelato è un pacchetto FCB, il segnale contenuto nella memoria è anche il pacchetto FCB che viene quindi filtrato nel filtro passa banda (101) e la differenza fra la frequenza di questo segnale ed un valore di 67,5 kHz viene determinata (109). Questa differenza rappresenta lo sfalsamento di frequenza esistente fra la frequenza portante della stazione di base e quella del radiotelefono mobile e può essere alimentata nel mezzo oscillante locale per compensare lo sfalsamento di frequenza. I confini del pacchetto FCB stabiliscono l'allineamento delle finestrelle o intervalli di tempo elementari della struttura TIMA che viene ricevuta dalla stazione di base.
ITRM910944A 1990-12-17 1991-12-17 Metodo di sincronizzazione in frequenza ed in finestrelle di tempo mediante filtrazione adattiva. IT1250962B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62853590A 1990-12-17 1990-12-17

Publications (3)

Publication Number Publication Date
ITRM910944A0 ITRM910944A0 (it) 1991-12-17
ITRM910944A1 ITRM910944A1 (it) 1993-06-17
IT1250962B true IT1250962B (it) 1995-04-24

Family

ID=24519302

Family Applications (1)

Application Number Title Priority Date Filing Date
ITRM910944A IT1250962B (it) 1990-12-17 1991-12-17 Metodo di sincronizzazione in frequenza ed in finestrelle di tempo mediante filtrazione adattiva.

Country Status (9)

Country Link
AU (1) AU636263B2 (it)
CA (1) CA2071552C (it)
DE (2) DE4193255C2 (it)
FR (1) FR2671248B1 (it)
GB (1) GB2256993B (it)
IL (1) IL100366A (it)
IT (1) IT1250962B (it)
SE (1) SE504792C2 (it)
WO (1) WO1992011706A1 (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2709894B1 (fr) * 1993-09-10 1995-10-20 Alcatel Mobile Comm France Procédé de détermination, par une station mobile d'un système de radiocommunications cellulaire, du type de la cellule à laquelle elle est rattachée, station mobile et station de base.
US5761250A (en) * 1995-08-15 1998-06-02 Rockwell International Corporation Iterative filtering frequency estimator and estimation method
JP3088338B2 (ja) * 1997-05-28 2000-09-18 埼玉日本電気株式会社 無線電話装置
DE19722219A1 (de) * 1997-05-28 1998-12-03 Alsthom Cge Alcatel Funkkommunikationssystem mit einer ortsfesten und einer beweglichen Funkvorrichtung
US6278699B1 (en) 1998-06-22 2001-08-21 Telefonaktiebolaget Lm Ericsson (Publ) Synchronization techniques and systems for spread spectrum radiocommunication
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
US6473420B1 (en) * 2001-02-16 2002-10-29 Harris Corporation Wideband ranging process for frequency acquisition
GB2534603B (en) * 2015-01-29 2019-07-31 Michell Instruments Ltd System for analysing the frequency of a signal, a method thereof and a system for measuring the relative phase between two input signals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317220A (en) * 1979-02-05 1982-02-23 Andre Martin Simulcast transmission system
US4466130A (en) * 1982-10-04 1984-08-14 Ael Microtel Limited Two pilot frequency control for communication systems
DE3508069C2 (de) * 1985-03-07 1993-12-02 Aeg Mobile Communication Gleichwellenfunkgerät mit nachgeregelter Senderfrequenz
GB8604981D0 (en) * 1986-02-28 1986-04-09 Mcgeehan J P Data transmission
CA1288878C (en) * 1988-08-15 1991-09-10 John D. Mcnicol Timing and carrier recovery in tdma without preamable sequence
DE59003646D1 (de) * 1989-03-16 1994-01-13 Siemens Ag Schaltung zur Erkennung eines Frequenzreferenzsignals.

Also Published As

Publication number Publication date
SE9202350D0 (sv) 1992-08-14
CA2071552A1 (en) 1992-06-18
GB2256993B (en) 1995-06-21
DE4193255C2 (de) 1997-02-20
FR2671248B1 (fr) 1994-11-04
IL100366A (en) 1995-05-26
ITRM910944A1 (it) 1993-06-17
ITRM910944A0 (it) 1991-12-17
IL100366A0 (en) 1992-09-06
WO1992011706A1 (en) 1992-07-09
FR2671248A1 (fr) 1992-07-03
CA2071552C (en) 1997-02-25
DE4193255T (it) 1992-12-10
GB9216946D0 (en) 1992-10-07
AU9169291A (en) 1992-07-22
SE504792C2 (sv) 1997-04-28
SE9202350L (sv) 1992-08-14
GB2256993A (en) 1992-12-23
AU636263B2 (en) 1993-04-22

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19961010