WO2000049723A1 - Procede et dispositif pour la synchronisation d'un recepteur avec un emetteur - Google Patents

Procede et dispositif pour la synchronisation d'un recepteur avec un emetteur Download PDF

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Publication number
WO2000049723A1
WO2000049723A1 PCT/DE2000/000309 DE0000309W WO0049723A1 WO 2000049723 A1 WO2000049723 A1 WO 2000049723A1 DE 0000309 W DE0000309 W DE 0000309W WO 0049723 A1 WO0049723 A1 WO 0049723A1
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WO
WIPO (PCT)
Prior art keywords
synchronization
channel
channels
time synchronization
evaluation
Prior art date
Application number
PCT/DE2000/000309
Other languages
German (de)
English (en)
Inventor
Bernhard Raaf
Jürgen MICHEL
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP00910520A priority Critical patent/EP1151548A1/fr
Priority to AU32714/00A priority patent/AU3271400A/en
Publication of WO2000049723A1 publication Critical patent/WO2000049723A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • H04B1/70775—Multi-dwell schemes, i.e. multiple accumulation times
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/708—Parallel implementation
    • 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
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation

Definitions

  • the invention relates to a method for synchronizing a receiver with a transmitter / transmit signal in a digital message transmission system, in particular a mobile radio system, the method comprising a step of time synchronization using at least one filter device matched to a predetermined synchronization code, and a device for carrying it out Procedure.
  • a digital information signal of low bandwidth is modulated with a high-frequency bit stream of high bandwidth. This is generated by a spreading code generator.
  • a code sequence which is identical to the spread code sequence, as used for modulation in the transmitter, is generated in the receiver. To ensure correct functioning of the receiver, this code sequence on the receiver side must be synchronized with the transmitter. Then the "despread" information signal is obtained by demodulation and integration. The most important task of synchronization during the signal acquisition phase is to detect the timing and phase of a synchronization signal.
  • TDMA Time Division Multiple Access
  • UMTS / WCDMA-FDD Universal Mobile Telecommunication System / Wide Band Code Division Multiple Access-Frequency Division Duplex
  • a three-stage process for synchronization during the acquisition phase is proposed at the current state of standardization.
  • the mobile station searches for the base station to which the transmission loss is lowest.
  • PSCH primary synchronization channel
  • SSCH secondary synchronization channel
  • peaks are determined for each base station within the range of the mobile station.
  • the detection of the position of the strongest peak provides the timing of the strongest base station modulo of the time slot length.
  • the output of the tuned filter is incoherently accumulated over a number of time slots.
  • the second step of the synchronization process is frame synchronization and code group identification for the base station found in the first step, which are carried out using the SSCH.
  • the received signal at the positions of a secondary synchronization code c s is correlated with all possible secondary synchronization codes (here: 17) according to the system protocol.
  • the single Units of this step are of secondary importance in the given context, as are those of the third step, which consists in the identification of the so-called "scrambling code" which is used by the determined base station. Details of these steps are given for the system mentioned as an example in the system document "ETSI STC SMG2 UMTS-Ll 163/98, UTRA / FED Physical Layer Description".
  • the invention is based on the object of specifying a method of the generic type in which the received signal energy is better utilized for the time synchronization process, thereby reducing measurement time and power consumption for the synchronization process, and an apparatus for carrying out this method.
  • the invention includes the basic technical teaching of using at least one additional physical channel of the message transmission system for time synchronization. This improves the utilization of the received signal energy, reduces the time required and reduces the power consumption in the receiver. Under a physical
  • Channel is understood to be one that is characterized by its frequency, a spreading code, the time window position or a space division state.
  • a time synchronization includes, in particular, the slot or time slot synchronization, but also a frame (frame) or a symbol synchronization.
  • a synchronization channel provided according to the transmission protocol of the message transmission system is used for a purpose other than that of time synchronization.
  • this is the secondary synchronization channel (SSCH).
  • SSCH secondary synchronization channel
  • one implementation possibility that requires comparatively little computational effort is that the code words of the second synchronization channel are obtained from the code of the primary synchronization channel or another known code by modulation with so-called Hadamard sequences. Then the evaluation of the correlations in the secondary synchronization channel for the purpose of time synchronization can be carried out via a so-called "Fast Hadamard" transformation.
  • control or data channel of the system in addition to time synchronization. This requires the definition of certain channel specifications.
  • the proposed method includes a separate correlation evaluation in the channels used for time synchronization and the subsequent linking of the evaluation results to a time synchronization indicator.
  • This link is incoherent, provided the system protocol does not provide a fixed phase relationship between the channels used for time synchronization.
  • the proposed procedure also offers the possibility that intermediate data obtained in the step of time synchronization results are saved and used for further steps, e.g. identifying the scrambling code.
  • the proposed method is used either permanently or as a function of the fulfillment of a predetermined condition, in particular as a function of the evaluability of the signals in the channels that can generally be used for time synchronization - expressed, for example, by exceeding a threshold value of the signal amplitude, or falling below one Threshold in the bit error rate or the like.
  • the device for carrying out the method according to the invention is particularly suitable and intended for use in the mobile station of a mobile radio network. It includes several correlator stages for evaluation and a calculation unit for calculating the time synchronization indicator from the outputs of the individual correlator stages in accordance with an algorithm of incoherent or coherent accumulation chosen depending on the system protocol. The output signals of the correlator stages are linked by a linear combination. The following methods of incoherent accumulation result:
  • the figure is a schematic diagram which serves to explain both an embodiment of the method and a preferred device for carrying out the method.
  • the figure shows a device 1 for time synchronization, the ⁇ as a component of operating according to the UMTS / FDD standard WCDM mobile station (not illustrated in total) one is settable.
  • a received signal x (k) is subjected to a synchronization evaluation in a primary synchronization channel PSCH and a secondary synchronization channel SSCH.
  • a correlator stage 3 is provided in the primary synchronization channel PSCH.
  • Correlator level 3 computes according to the relationship
  • Chips with c p 0 outside the 256 specified
  • the input signal (in accordance with the protocol specifications drawn up at the time of registration) is fed to 17 correlators, which are denoted in the figure by the reference number 5. These determine according to the relationship
  • the output signals of the correlators 3 and 5 are fed to an evaluation or calculation unit 9, which either according to the relationship
  • the overall correlation z (K) is calculated incoherently as a time synchronization indicator.
  • this is subjected to an accumulation modulo of the time slot length and then to a maximum detection in a maximum detector 11, as a result of which time synchronization with the "best" base station of the mobile radio system is established.
  • the correlation evaluation in the secondary synchronization channel SSCH is particularly simple in the UMTS / WCDMA-FDD system explained as an example, if the code words of the secondary synchronization channel are derived from the code of the primary synchronization channel PSCH or another known code by modulation with so-called Hadamard Consequences are formed as suggested in the conference paper Ericsson, ETSI SMG2 UMTS Ll Export Group, Meeting # 6, Helsinki, FI, September 8-11, 1998. In this case, a Fast Hadamard transformation is used, which is also described as such in the publication mentioned.
  • the embodiment of the invention is not limited to this example, but - in a form adapted to the respective system protocol - is also possible with other digital message transmission systems in which time synchronization of a received signal is relevant.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif pour la synchronisation temporelle d'un récepteur avec un émetteur dans un système de communication, en particulier dans un système de radiocommunication mobile. Selon l'invention, on effectue la synchronisation, au moins lorsqu'une condition prédéfinie est satisfaite et en utilisant au moins deux canaux physiques du système de communication parallèlement l'un à l'autre, en procédant à une évaluation de corrélation distincte dans les canaux.
PCT/DE2000/000309 1999-02-19 2000-02-01 Procede et dispositif pour la synchronisation d'un recepteur avec un emetteur WO2000049723A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00910520A EP1151548A1 (fr) 1999-02-19 2000-02-01 Procede et dispositif pour la synchronisation d'un recepteur avec un emetteur
AU32714/00A AU3271400A (en) 1999-02-19 2000-02-01 Method and device for synchronizing a receiver with a transmitter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19907130.6 1999-02-19
DE19907130 1999-02-19

Publications (1)

Publication Number Publication Date
WO2000049723A1 true WO2000049723A1 (fr) 2000-08-24

Family

ID=7898139

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/000309 WO2000049723A1 (fr) 1999-02-19 2000-02-01 Procede et dispositif pour la synchronisation d'un recepteur avec un emetteur

Country Status (4)

Country Link
EP (1) EP1151548A1 (fr)
CN (1) CN1340250A (fr)
AU (1) AU3271400A (fr)
WO (1) WO2000049723A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080404A2 (fr) * 2001-03-29 2002-10-10 Soma Networks, Inc. Systeme et procede d'acquisition d'un emetteur radio
CN103491044A (zh) * 2006-08-23 2014-01-01 高通股份有限公司 频分多址系统中的捕获

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JUN-KUI AHN ET AL: "New cell search algorithm for inter-cell asynchronous mode DS-CDMA mobile radio system", VTC '98. 48TH IEEE VEHICULAR TECHNOLOGY CONFERENCE. PATHWAY TO A GLOBAL WIRELESS REVOLUTION (CAT. NO.98CH36151), VTC '98. 48TH IEEE VEHICULAR TECHNOLOGY CONFERENCE. PATHWAY TO A GLOBAL WIRELESS REVOLUTION, OTTAWA, ONT., CANADA, 18-21 MAY 1998, 1998, New York, NY, USA, IEEE, USA, pages 1336 - 1340 vol.2, XP002138683, ISBN: 0-7803-4320-4 *
KIM D I ET AL: "I/Q MULTIPLEXED CODE ASSIGNMENT FOR FAST CELL SEARCH IN ASYNCHRONOUS DS/CDMA CELLULAR SYSTEMS", IEEE COMMUNICATIONS LETTERS,US,IEEE SERVICE CENTER, PISCATAWAY,US, vol. 2, no. 6, 1 June 1998 (1998-06-01), pages 159 - 161, XP000771820, ISSN: 1089-7798 *
NYSTROM J ET AL: "Comparison of cell search methods for asynchronous wideband CDMA cellular system", ICUPC '98. IEEE 1998 INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS. CONFERENCE PROCEEDINGS (CAT. NO.98TH8384), ICUPC '98. IEEE 1998 INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS. CONFERENCE PROCEEDINGS, FLORENCE, ITALY, 1998, New York, NY, USA, IEEE, USA, pages 783 - 787 vol.2, XP002138684, ISBN: 0-7803-5106-1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080404A2 (fr) * 2001-03-29 2002-10-10 Soma Networks, Inc. Systeme et procede d'acquisition d'un emetteur radio
WO2002080404A3 (fr) * 2001-03-29 2003-01-09 Soma Networks Inc Systeme et procede d'acquisition d'un emetteur radio
US7103362B2 (en) 2001-03-29 2006-09-05 Soma Networks Inc. System and method for radio transmitter acquisition
US7302268B2 (en) 2001-03-29 2007-11-27 Soma Networks Inc. System and method for radio transmitter acquisition
CN103491044A (zh) * 2006-08-23 2014-01-01 高通股份有限公司 频分多址系统中的捕获
CN103491044B (zh) * 2006-08-23 2017-03-22 高通股份有限公司 频分多址系统中的捕获

Also Published As

Publication number Publication date
CN1340250A (zh) 2002-03-13
EP1151548A1 (fr) 2001-11-07
AU3271400A (en) 2000-09-04

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