WO2006107136A1 - Appareil et procede de detection de preambule et systeme de repetition de rf les utilisant - Google Patents

Appareil et procede de detection de preambule et systeme de repetition de rf les utilisant Download PDF

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Publication number
WO2006107136A1
WO2006107136A1 PCT/KR2005/004540 KR2005004540W WO2006107136A1 WO 2006107136 A1 WO2006107136 A1 WO 2006107136A1 KR 2005004540 W KR2005004540 W KR 2005004540W WO 2006107136 A1 WO2006107136 A1 WO 2006107136A1
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WO
WIPO (PCT)
Prior art keywords
preamble
signal
tdd frame
time
detecting
Prior art date
Application number
PCT/KR2005/004540
Other languages
English (en)
Inventor
Hae-Chul Lee
Eun-Cheul Jeong
Seong-Choon Lee
Sang-Ho Yi
Yong-Joo Tcha
Original Assignee
Kt Corporation
Solid Technologies, 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
Priority claimed from KR1020050029617A external-priority patent/KR100902741B1/ko
Application filed by Kt Corporation, Solid Technologies, Inc. filed Critical Kt Corporation
Publication of WO2006107136A1 publication Critical patent/WO2006107136A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations

Definitions

  • the present invention relates to a preamble detecting apparatus and an RF repeating system using the same; and, more particularly, to a preamble detecting apparatus that can detect a preamble only using information on a Time Division Duplex (TDD) frame structure without preamble information including preamble pattern, preamble symbol structure and the like in an RF communication system using a TDD scheme to thereby enable RF communication equipment, e.g., a repeater, of a TDD- based RF communication to maintain time synchronization, and an RF repeating system using the same.
  • TDD Time Division Duplex
  • Time Division Duplex (TDD) scheme enables communication using a single frequency. This is possible due to the development of parts and equipments that can be accurately synchronized.
  • the TDD scheme can support the same service using a smaller number of timeslots than a Frequency Division Duplexing (FDD) scheme. Also, because the TDD scheme supports asymmetric structure, which is suitable for transmission of Internet application. Consequently, compared with the FDD scheme, the TDD scheme can transmit data at a high speed using half of the frequency, thereby providing services at a relatively low cost. These characteristics have attracted great attention from RF communication service providers. In the past, sync detection for the dynamic timeslot allocation was difficult and the problem of time delay according to transmission distance was not solved. However, in recent years, the problem is somewhat solved and the markets are expanding. As described above, because the flexibility of downlink and uplink traffic allocation in TDD scheme is compatible with the existing wired Internet communication systems having many downlink traffics, it again becomes attractive.
  • FDD Frequency Division Duplexing
  • a mobile station acquires an initial synchronization using a preamble signal transmitted from a base station periodically, generally on a frame basis. At this point, predefined preamble information is used between the base station and the mobile station.
  • the mobile can detect a preamble position by comparing the predefined preamble signal with a preamble signal received from the base station over a radio link. Also, the mobile station can acquire an initial synchronization with respect to frequency and time and estimate a radio channel condition.
  • the TDD repeater receives a downlink signal from the base station and retransmits it to the mobile terminal.
  • the TDD receiver receives an uplink signal from the mobile station and retransmits it to the base station. In this manner, the TDD repeater performs a switching operation between the downlink period and the uplink period.
  • the TDD repeater has to exactly know the time of changing from the downlink to the uplink and the time of changing form the uplink to the downlink. Therefore, when the TDD repeater knows in advance the preamble information, a starting position of the preamble can be detected using the previously known preamble information and the preamble signal received from the base station over the radio channel. Based on the detected starting position of the preamble, the time of changing from the downlink to the uplink and the time of changing from the uplink to the downlink can be known by means of the predefined TDD frame structure. However, when the TDD repeater does not know the preamble information, the starting position of the preamble cannot be detected using the method described above. Consequently, in this environment, the RF communication equipments of the RF communication system using the TDD frame structure cannot acquire the initial synchronization .
  • an object of the present invention to provide a preamble detecting apparatus that can detect a preamble only by using information on a TDD frame structure without preamble information including preamble pattern, preamble symbol structure and the like in an RF communication system using a TDD scheme, thereby enabling RF communication equipment, e.g., a repeater, of a TDD- based RF communication to maintain time synchronization, and an RF repeating system using the same.
  • RF communication equipment e.g., a repeater
  • a preamble detecting apparatus including: a time delayer for delaying a TDD frame signal (S(t)) by a preamble period (preferably, a TDD frame length); a complex correlator for calculating a complex correlation between the time-delayed signal (S (t- TF)) and the TDD frame signal (S(t)); and a preamble position detector for detecting a preamble position using an output value (complex correlation value (C(t))) of the complex correlator.
  • a preamble detecting method comprising the steps of: a) delaying a TDD frame signal (S(t)) by a preamble period (preferably, a TDD frame length); b) calculating a complex correlation between the time-delayed signal (S(t-T F )) and the TDD frame signal (S(t)); and c) calculating an absolute value of a complex correlation value (C(t))) obtained in the step b), and detecting a preamble position using a maximum value of the absolute value.
  • an RF repeating system for setting a time of switching between a downlink and an uplink by using a preamble position detected by a preamble detecting apparatus, in which the RF repeating system detects the preamble position of the preamble signal contained in the downlink through the preamble detecting apparatus and controls switching time of switches connected to a "link antenna for RF interface with the base station" and a "service antenna for RF interface with the mobile terminal” by using the detected position of the preamble signal.
  • the RF communication system using the TDD scheme can detect the preamble using only the TDD frame structure without preamble information (e.g., preamble pattern, preamble symbol structure, etc.).
  • preamble information e.g., preamble pattern, preamble symbol structure, etc.
  • the complex correlation between the signal inputted to the preamble detecting apparatus and the delayed signal produced by delaying the input signal by the preamble period generally on a frame basis
  • the absolute value of the output value (complex correlation value) of the complex correlator is calculated. Based on the absolute value, the preamble can be detected by finding the position of the periodically repeating maximum value.
  • the present invention can enable the RF communication equipments such as the repeater to maintain the time synchronization in the TDD-based communication.
  • the RF communication equipments using the TDD scheme can maintain the time synchronization .
  • Fig. 1 illustrates an RF communication frame structure using a TDD scheme in accordance with the present invention
  • Fig. 2 is a block diagram of a preamble detecting apparatus in accordance with an embodiment of the present invention
  • Fig. 3 illustrates an absolute value of an output of a complex correlator with respect to a TDD frame signal of Fig. 1;
  • Fig. 4 is a block diagram of an RF repeating system using the preamble detecting apparatus in accordance with the present invention.
  • Fig. 1 illustrates an RF communication frame structure using a TDD scheme in accordance with the present invention.
  • reference symbols TTG, RTG, T F , T P , T DL , T UL , T TTG , and T RTG represent a transition gap between the downlink burst and the subsequent uplink burst, a transition gap between the uplink burst and the subsequent downlink burst, a TDD frame length, a preamble length, a downlink length, an uplink length, a TTG length, and a RTG length, respectively.
  • Fig. 2 is a block diagram of a preamble detecting apparatus in accordance with an embodiment of the present invention.
  • the preamble detecting apparatus detects a preamble in the TDD frame structure of Fig. 1.
  • the preamble detecting apparatus 20 includes a time delayer 21, a complex correlator 22, and a preamble position detector 23.
  • the time delayer 21 delays an external TDD frame signal S(t) by a preamble period (generally, the TDD frame length).
  • the complex correlator 22 calculates a complex correlation between the time-delayed signal S(t-T F ) and the external TDD frame signal S(t).
  • the preamble position detector 23 detects a preamble position using an output value (complex correlation value C(t)) of the complex correlator 22.
  • the preamble position can be detected using a maximum value of an output of the complex correlator 22 (an absolute value
  • the RF communication equipments such as a repeater can know a switching time between the downlink and the uplink.
  • the complex correlation between the signal S(t) inputted to the preamble detecting apparatus and the delayed signal S(t-T F ) produced by delaying the input signal S(t) by the preamble period (generally on a frame basis). Then, the absolute value
  • the output value (the complex correlation value C(t) of the complex correlator 22) can be defined as Eq. (1) below.
  • Eq. (1) is expressed in a digital signal form, the result can be defined as Eq. (2) below.
  • N F is an integer closest to T F xf s
  • N P is an integer closest to T P xf s
  • the absolute value I C ( t ) I of the output value (complex correlation value C(t)) of the complex correlator 22 has the characteristics of Fig. 3.
  • Fig. 3 illustrates an example of the absolute value
  • the preamble position can be found using the maximum value of the absolute value
  • the RF communication equipments can know the information on the time of switching between the downlink and the uplink (that is, the time of switching from the downlink to the uplink and the time of switching from the uplink to the downlink) by using the detected preamble period.
  • the time from t PE i-T P to t PE i+T DL -T P is the downlink period (the downlink length T DL in Fig. 1)
  • the time from t PE i+T DL -T P +T TTG to t PE i+T DL -T P +T TTG +T UL is the uplink period (the uplink length T UL in Fig. 1). This is repeated every frame period (the TDD frame length T F in Fig. 1).
  • the time of switching from the downlink to the uplink is set between t PE i+T DL -T P and t PE i+T DL -T P +T TTG
  • the time of switching from the uplink to the downlink is set between t PE i+T DL -T P +T TT G+TuL and t PE i+T DL -T P +T TT G+T UL +T RTG .
  • Fig. 4 is a block diagram of the RF repeating system using the preamble detecting apparatus in accordance with an embodiment of the present invention.
  • the RF repeating system detects the position of the preamble signal contained in the downlink through the preamble detecting apparatus 20 of Fig. 2, and controls switching time of the switches 41 and 42 connected to a "link antenna for RF interface with the base station" and a "service antenna for RF interface with the mobile terminal" by using the detected position of the preamble signal.
  • the RF repeating system using the preamble detecting apparatus includes a link antenna 40, a downlink signal processor 42, an uplink signal processor 43, switches 41 and 45, a frequency down- converter 43, an analog/digital (A/D) converter 44, a preamble detecting apparatus 20, and a service antenna 47.
  • the link antenna 40 transmits/receives RF signals between the base station and the RF repeating system.
  • the downlink signal processor 42 performs a downlink process on the RF signal, which is received from the base station, through a low noise amplifier (LNA), a gain controller, and a linear power amplifier.
  • LNA low noise amplifier
  • the uplink signal processor 43 performs an uplink processing on the RF signal, which is received from the mobile station, through a low noise amplifier, a gain controller, and a linear power amplifier.
  • the switches 41 and 45 switch the downlink and the uplink path.
  • the frequency down- converter 43 down-converts analog signal that is low- noise-amplified at the downlink signal processor 42.
  • the A/D converter 44 converts the analog signal from the frequency down-converter 43 into digital signal.
  • the preamble detecting apparatus 20 receives the digital signal from the A/D converter 44 to detect the position of the preamble signal contained in the downlink, and controls the switching time (that is, the time of switching from the downlink to the uplink and the time of switching from the uplink to the downlink) of the switches 41 and 45 connected to the link antenna 40 and the service antenna 47 by using the detected position of the preamble signal.
  • the service antenna 47 transmits/receives RF signals between the mobile terminal and the RF repeating system.
  • the RF repeating system using the preamble detecting apparatus in accordance with the present invention can enable the RF communication equipments such as the repeater to maintain the time synchronization in the TDD-based communication.

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

Abstract

L'invention concerne un appareil de détection de préambule qui comporte: un retardateur temporel qui retarde un signal de trame TDD (S(t)) par une période de préambule (de préférence, une longueur de trame TDD); un corrélateur complexe qui calcule une corrélation complexe entre le signal retardé temporellement (S(t-TF)) et le signal de trame TDD (S(t)); et un détecteur de position de préambule qui détecte une position de préambule au moyen d'une valeur de sortie (valeur de corrélation complexe (C(t)) du corrélateur complexe.
PCT/KR2005/004540 2005-04-08 2005-12-26 Appareil et procede de detection de preambule et systeme de repetition de rf les utilisant WO2006107136A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050029617A KR100902741B1 (ko) 2004-08-27 2005-04-08 프리엠블 검출 장치 및 그 방법과 그를 이용한 무선 중계시스템
KR10-2005-0029617 2005-04-08

Publications (1)

Publication Number Publication Date
WO2006107136A1 true WO2006107136A1 (fr) 2006-10-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017881A1 (de) * 2008-04-09 2009-10-22 Andrew Wireless Systems Gmbh TDD-Repeater für ein Drahtlos-Netz und Verfahren zum Betrieb eines solchen Repeaters
EP2162991A1 (fr) * 2007-06-29 2010-03-17 Telefonaktiebolaget LM Ericsson (PUBL) Procédé pour accusé de réception et d'identification rapides d'un message de demande d'accès de service ou d'un préambule de celui-ci
EP2162992A1 (fr) * 2007-06-29 2010-03-17 Telefonaktiebolaget LM Ericsson (PUBL) Procédé de détermination d'une relation d'intervalle de temps ultérieur, pour des messages de demande de services, provenant d'un équipement utilisateur

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JPH07131401A (ja) * 1993-10-28 1995-05-19 Nippon Telegr & Teleph Corp <Ntt> 無線中継装置
US6108364A (en) * 1995-08-31 2000-08-22 Qualcomm Incorporated Time division duplex repeater for use in a CDMA system
JP2002111571A (ja) * 2000-09-28 2002-04-12 Nippon Telegr & Teleph Corp <Ntt> 無線中継器
KR20040004261A (ko) * 2003-12-08 2004-01-13 주식회사 컨버시스 시분할 복신 중계 방법 및 장치
KR20040108468A (ko) * 2003-06-17 2004-12-24 유호상 시분할 이중화 시스템에서 기지국 신호로부터 송수신스위칭 동기를 획득하는 방법 및 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07131401A (ja) * 1993-10-28 1995-05-19 Nippon Telegr & Teleph Corp <Ntt> 無線中継装置
US6108364A (en) * 1995-08-31 2000-08-22 Qualcomm Incorporated Time division duplex repeater for use in a CDMA system
JP2002111571A (ja) * 2000-09-28 2002-04-12 Nippon Telegr & Teleph Corp <Ntt> 無線中継器
KR20040108468A (ko) * 2003-06-17 2004-12-24 유호상 시분할 이중화 시스템에서 기지국 신호로부터 송수신스위칭 동기를 획득하는 방법 및 장치
KR20040004261A (ko) * 2003-12-08 2004-01-13 주식회사 컨버시스 시분할 복신 중계 방법 및 장치

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2162991A1 (fr) * 2007-06-29 2010-03-17 Telefonaktiebolaget LM Ericsson (PUBL) Procédé pour accusé de réception et d'identification rapides d'un message de demande d'accès de service ou d'un préambule de celui-ci
EP2162992A1 (fr) * 2007-06-29 2010-03-17 Telefonaktiebolaget LM Ericsson (PUBL) Procédé de détermination d'une relation d'intervalle de temps ultérieur, pour des messages de demande de services, provenant d'un équipement utilisateur
EP2162991A4 (fr) * 2007-06-29 2013-07-10 Ericsson Telefon Ab L M Procédé pour accusé de réception et d'identification rapides d'un message de demande d'accès de service ou d'un préambule de celui-ci
EP2162992A4 (fr) * 2007-06-29 2013-07-10 Ericsson Telefon Ab L M Procédé de détermination d'une relation d'intervalle de temps ultérieur, pour des messages de demande de services, provenant d'un équipement utilisateur
US9072076B2 (en) 2007-06-29 2015-06-30 Telefonaktiebolaget L M Ericsson (Publ) Method for fast acknowledgement and identification of a service access request message or a preamble thereof
DE102008017881A1 (de) * 2008-04-09 2009-10-22 Andrew Wireless Systems Gmbh TDD-Repeater für ein Drahtlos-Netz und Verfahren zum Betrieb eines solchen Repeaters
DE102008017881B4 (de) * 2008-04-09 2012-04-12 Andrew Wireless Systems Gmbh TDD-Repeater für ein Drahtlos-Netz und Verfahren zum Betrieb eines solchen Repeaters
DE102008017881B9 (de) * 2008-04-09 2012-11-08 Andrew Wireless Systems Gmbh TDD-Repeater für ein Drahtlos-Netz und Verfahren zum Betrieb eines solchen Repeaters
US9219524B2 (en) 2008-04-09 2015-12-22 Andrew Wireless Systems Gmbh TDD repeater for a wireless network and method for operating said repeater
US9774368B2 (en) 2008-04-09 2017-09-26 Andrew Wireless Systems Gmbh TDD repeater for a wireless network and method for operating said repeater
US10651893B2 (en) 2008-04-09 2020-05-12 Andrew Wireless Systems Gmbh TDD repeater for a wireless network and method for operating said repeater

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