WO2007102684A1 - Appareil et procede d'annulation de signal d'interference de repeteur de communication mobile - Google Patents

Appareil et procede d'annulation de signal d'interference de repeteur de communication mobile Download PDF

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Publication number
WO2007102684A1
WO2007102684A1 PCT/KR2007/001084 KR2007001084W WO2007102684A1 WO 2007102684 A1 WO2007102684 A1 WO 2007102684A1 KR 2007001084 W KR2007001084 W KR 2007001084W WO 2007102684 A1 WO2007102684 A1 WO 2007102684A1
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WO
WIPO (PCT)
Prior art keywords
signal
unit
multipath
channel
mobile communication
Prior art date
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Ceased
Application number
PCT/KR2007/001084
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English (en)
Inventor
Byung-Yang Ahn
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Airpoint Co Ltd
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Airpoint Co Ltd
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Filing date
Publication date
Application filed by Airpoint Co Ltd filed Critical Airpoint Co Ltd
Priority claimed from KR1020070021379A external-priority patent/KR20070091547A/ko
Publication of WO2007102684A1 publication Critical patent/WO2007102684A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • 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
    • H04B1/70754—Setting of search window, i.e. range of code offsets to be searched
    • 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
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15585—Relay station antennae loop interference reduction by interference cancellation
    • 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
    • H04L25/20—Repeater circuits; Relay circuits

Definitions

  • the present invention relates to an apparatus and method for canceling an interference signal of a mobile communication repeater, and more particularly, to an apparatus and method for canceling a multipath fading signal input to a receiving antenna of a repeater and an interference signal due to a reverse signal through multipath selection and channel estimation using pilot signal searching.
  • a repeater used in a cellular mobile communication system is installed within a transmission interval for serving a terminal in a shadow zone with a signal of high quality.
  • FIG. 1 is a conceptual diagram illustrating an operating environment of a repeater.
  • a repeater 1 which has received a weak signal as a base station signal amplifies the base station signal to transmit it to a service area within a shadow zone, and amplifies a received terminal station signal within the service area to transmit it to the base station.
  • Examples of signals input to the receiving antenna 2 of the repeater 1 include, as shown in FIG. 1, a signal Sl incoming directly from a target base station 4, a multipath signal MPSl thereof, a signal S2 incoming from a neighboring base station 5, a multipath signal MPS2 thereof, a reverse signal RS which is transmitted from a transmitting antenna 3 of the repeater 1 and then comes back to the receiving antenna 2 of the repeater 1 because the transmitted signal TS and the received signal of the repeater 1 use the same frequency band, and so forth. Disclosure of Invention
  • Various methods are used for canceling an interference signal in the repeater 1 where the transmitted and received signals co-exist.
  • One representative method is provided with a function for canceling oscillation due to the reverse signal RS or reducing interference due to the reverse signal RS by reducing the power of a retransmitted signal.
  • Another typical method is to ensure spacing between transmitting and receiving antennas 3 and 2, or install the antennas with a specific structure disposed therebetween, etc.
  • the mobile communication repeater 1 is provided with a function for canceling an interference signal incoming from a neighboring base station 5.
  • some conventional repeaters emit test signals from transmitting antennas to measure components of the signals input to respective receiving antennas.
  • This test signal is emitted in a frequency band used in a mobile communication system, and thus acts as an interference signal in the existing system and should be frequently transmitted in order to make its transmission rate and an update frequency of channel estimation high enough to adapt to channel changes.
  • the repeater generally uses a directional antenna toward a target base station.
  • a repeater having a function for canceling reverse interference by transmitting a test signal can only estimate a channel between repeater antennas and thus cannot cancel a signal received from a base station when the received signal is of a multipath fading type.
  • the invention is directed to an apparatus for canceling an interference signal of a mobile communication repeater, the apparatus including: a receiving antenna; a down-converter for down-converting the received signal through the receiving antenna into a baseband or intermediate frequency band signal; an analog/ digital converter for converting the baseband or intermediate frequency band signal into a digital signal; an interference canceling unit for canceling the interference signal through multipath selection and channel estimation using pilot signal searching with respect to the multipath signal input from a base station and a reverse signal coming back to the receiving antenna after being transmitted to a transmitting antenna to be described below; a digital/analog converter for converting the signal output from the interference canceling unit into an analog signal; an up-converter for up-converting the analog signal into a Radio Frequency (RF) signal; and the transmitting antenna for transmitting the RF signal output from the up-converter.
  • RF Radio Frequency
  • the interference canceling unit includes: an initial synchronization unit for performing slot synchronization, frame synchronization, code group synchronization and scrambling code search on a wideband Code Division Multiple Access (CDMA) system; a multipath searching unit for searching for a multipath signal component input within an interval determined based on optimal symbol timing information and the scrambling code obtained by the initial synchronization unit; an adaptive channel estimating unit for estimating a received power and a phase for a multipath component that exceeds a threshold obtained by the multipath searching unit to measure an impulse response of a channel; a channel matching filter unit for deriving a reverse channel function based on the channel information obtained by the adaptive channel estimating unit and canceling the interference signal through filtering; and a controller connected to and controlling overal operation of the initial synchronization unit, the multipath searching unit, the adaptive channel estimating unit, and the channel matching filter unit.
  • CDMA Code Division Multiple Access
  • the invention is directed to a method of canceling an interference signal of a mobile communication repeater including the steps of: performing, at an initial synchronization unit, slot synchronization and frame synchronization, code group synchronization, and scrambling code synchronization on a signal received through a receiving antenna; after completion of synchronization, setting, at a multipath searching unit, a search window determined by the number of tabs of the channel matching filter unit from starting positions of initial slot synchronization and frame synchronization for acquiring the initial synchronization of a wideband CDMA base station to search for power of a multipath signal; estimating, at an adaptive channel estimating unit, powers and phases of a reverse channel of the repeater and a multipath channel of the base station; calculating, at a channel matching filter unit, a reverse channel response for the channel obtained through the multipath channel searching to filter the received signal; and amplifying the filtered signal.
  • an apparatus and method for canceling an interference signal of a mobile communication repeater according to the present invention can effectively cancel a multipath signal received from a base station as well as a reverse signal of the repeater, so that a terminal within a service area can be provided with a signal of high quality.
  • FIG. 1 is a conceptual diagram illustrating an operating environment of a repeater.
  • FIG. 2 is a block diagram illustrating a control circuit of an apparatus for canceling a multipath signal of a wideband CDMA system in accordance with an exemplary embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating control circuits of a multipath searching unit and an adaptive channel estimating unit in accordance with an exemplary embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a control circuit of a channel matching filter unit in accordance with an exemplary embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a method of canceling a multipath signal in accordance with an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a control circuit of an apparatus for canceling a multipath signal of a wideband CDMA system in accordance with an exemplary embodiment of the present invention.
  • a repeater having an apparatus for canceling a multipath signal includes a receiving antenna 11, a down-converter 12 for down-converting a received signal into a base band or intermediate frequency signal, an analog/digital converter (ADC) 13 connected to an output end of the down- converter 12 and converting the down-converted base band or intermediate frequency signal into a digital signal, an interference canceling unit 14 for canceling interference due to a reverse signal and a multipath interference signal of a base station, a digital/ analog converter (DAC) 15 connected to an output end of the interference canceling unit 14 and converting a digital signal into an analog signal, an up-con verter 16 connected to an output end of the DAC 15 and up-converting an output signal of the DAC into a RF frequency band signal, and a transmitting antenna 17 connected to an output end of the up-con verter 16 and transmitting a signal to a terminal station within a service area.
  • ADC analog/digital converter
  • the interference canceling unit 14 is composed of an initial synchronization unit 141 for performing slot synchronization, frame synchronization, code group synchronization, and scrambling code searching on a wideband CDMA system, a multipath searching unit 142 for searching for components of multipath signals input to an interval determined based on scrambling code and optimal symbol timing information obtained by the initial synchronization unit 141, an adaptive channel estimating unit 143 for performing a channel estimating function by estimating a phase and a received power of a multipath component that exceeds a threshold obtained by the multipath searching unit 142, a channel matching filter unit 144 for canceling an interference signal by performing a reverse channel function from channel information obtained by the adaptive channel estimating unit 143, an amplifying unit 145 for amplifying a signal for transmitting data of higher quality to a terminal station within a service area, and a controller 146 for controlling overall functioning for canceling interference.
  • an initial synchronization unit 141 for performing slot synchronization, frame synchronization, code group synchronization, and
  • the initial synchronization unit 141 of the mobile communication system using the wideband CDMA scheme performs synchronization through a three-step cell searching procedure.
  • a primary synchronization channel is used to rapidly find a slot starting point.
  • the primary synchronization channel is composed of Generalized Hierarchical Golay (GHG) codes having an unmodulated 256-chip length, and the same codes are transmitted per each slot so that a matching filter is used for a primary synchronization code to find the slot starting point.
  • GGG Generalized Hierarchical Golay
  • a secondary synchronization channel is used to find a frame starting point and a scrambling code group. While the secondary synchronization channel use codes having the same 256-chip length as the primary synchronization channel, a different code is transmitted per each slot.
  • the secondary synchronization channel uses hopping sequences and corresponds to a code group where a scrambling code used by the present base station belongs.
  • the number of scrambling codes used in a wideband CDMA system is 8192 in total, which is divided into 64 code groups, 8 scrambling code sets are present per each code group, and each of the scrambling code sets is composed of one primary scrambling code and 15 secondary scrambling codes.
  • FIG. 3 is a block diagram illustrating control circuits of a multipath searching unit and an adaptive channel estimating unit in accordance with an exemplary embodiment of the present invention.
  • the multipath searching unit 142 searches for a component of a multipath signal input to a search window determined based on optimal symbol timing information and the primary scrambling code obtained by the initial synchronization unit.
  • the search window is equal to the number of tabs of a channel matching filter.
  • the multipath searching is determined through a correlation with the primary scrambling code transmitted through the common pilot channel.
  • the multipath components within the search window are determined through the correlation between a received signal and a primary scrambling code shifted at an interval of 1/N chip.
  • N denotes the number of samples per chip.
  • a common pilot channel of a base station spreads 1+j data to a primary scrambling code on a 256-chip basis and then transmits the data, and the multipath searching unit accumulates energy resulting from coherent accumulation of the correlations obtained by complex de-spreading on a 256-chip basis to calculate energy of the multipath components.
  • a code phase control unit 1422 controls the code to be shifted at an interval of 1/N within the search window, and a code generator 1423 generates a scrambling code obtained by the initial synchronization unit 141 under the control of code phase control unit 1422.
  • a correlator 1421 calculates a complex correlation between a received signal and a scrambling code generated by the code generator 1423, and a coherent accumulator 1424 accumulates the correlation obtained by the correlator 1421 on a 256-chip basis.
  • An incoherent energy accumulator 1425 incoherently accumulates the energy of the correlation obtained by the coherent accumulator 1424 on a 256-chip basis by a determined number.
  • a multipath signal discriminating unit 1426 receives signal energy per each path phase from the incoherent energy accumulator 1425, identifies a path whose signal energy exceeds a threshold, and transmits it to the controller 146.
  • the adaptive channel estimating unit 143 estimates phases and signal powers of multipath components delivered from the multipath searching unit 142, and performs a procedure of coherently obtaining a correlation in order to obtain the phase and the signal power of each multipath component. Meanwhile, the multipath searching unit incoherently accumulates the correlation obtained on a 256-chip basis to obtain the energy of the multipath.
  • a code phase control unit 1432 controls the code to be generated in the multipath position obtained by the multipath searching unit 142, and a code generator 1433 generates a scrambling code obtained by the initial synchronization unit 141 under the control of code phase control unit.
  • a correlator 1431 calculates a complex correlation between a received signal and a scrambling code generated by the code generator 1433, and a coherent accumulator 1434 accumulates the correlation obtained by the correlator 1431 on a 256-chip basis to obtain a power and a phase of each path. Repeating an operation of the coherent accumulator 1434 may obtain more stable channel information.
  • a multipath signal power and phase information collector 1435 stores the phase and the power of the multipath component obtained by the coherent accumulator 1434.
  • the channel matching filter unit 144 performs a reverse channel function from the channel information obtained by the adaptive channel estimating unit 143 to cancel an interference signal.
  • Equation 1 shows the sum of multipath fading signals as received signals input to the receiving antenna of the repeater.
  • a transmitted signal of a base station is denoted by s(t)
  • the input signal x(t) of the receiving antenna of the repeater is given as follows:
  • a signal input to the receiving antenna of the repeater has a type of N multipath signals in which an amplitude and a phase of a transmitted signal of the base station are modulated by
  • the transmitted signal transmitted to the transmitting antenna of the repeater after it passes the repeater of the present invention is G x s(t) (here, G denotes gain of the repeater), and both the reverse signal input to the receiving antenna and the multipath signal input from the base station are represented by the transmitted signal s(t) of the base station having an amplitude modulation of
  • Equation 1 The multipath searching unit 142 and the adaptive channel estimating unit 143 estimate the power and phase transition of the multipath in Equation 1 and deliver the estimation to the channel matching filter unit 144.
  • Equations 2 show derivation of a multipath channel function h(t).
  • Equations 3 represent a response when the received signal
  • [60] has passed the channel matching filter unit 144 performing the reverse channel function.
  • C denotes a constant
  • Equations 4 [65] Accordingly, a filter coefficient of the channel matching filter unit 144 can be obtained by Equations 4. [66] Equations 4
  • FIG. 4 is a block diagram illustrating a control circuit of a channel matching filter unit in accordance with an exemplary embodiment of the present invention.
  • a Fast Fourier Transform (FFT) unit 1441 performs a FFT on the multipath channel value obtained by the adaptive channel estimating unit 143 to obtain a frequency response characteristic.
  • a reverse channel frequency response calculator 1442 obtains a frequency response of a reverse channel function so as to make the product of a reverse channel frequency transfer function and the frequency response value of the channel obtained by the FFT unit 1441 a constant.
  • An Inverse FFT (IFFT) unit 1443 transforms the frequency response of the reverse channel function into a value in the time domain and then sets the value as a tap coefficient of the channel matching filter unit 144.
  • IFFT Inverse FFT
  • a filter coefficient memory 1444 stores the filter coefficient of the reverse channel function obtained by the IFFT unit 1443, and a filter 1445 receives and filters the filter coefficient stored in the filter coefficient memory 1444 to effectively cancel not only the multipath signal received from the base station but the reverse signal component incoming to the receiving antenna from the transmitting antenna of the repeater.
  • FIG. 5 is a flowchart illustrating a method of canceling a multipath signal in accordance with an exemplary embodiment of the present invention.
  • step 501 frame synchronization and code group synchronization (step 502), and primary scrambling code synchronization (step 503) is performed on the wideband CDMA system. Then, it is determined whether the initial synchronization is successfully completed (step 504), and the process moves to a multipath searching step (505) when the initial synchronization is successfully completed and moves back to the slot synchronization (501) when the initial synchronization is not sucessfully completed.
  • the multipath signal is determined when it exceeds a threshold (step 506), and a power and a phase of the multipath channel are estimated (step 507).
  • the process then goes back to the multipath signal searching (step 505) when the power of the multipath signal is not greater than the threshold and moves to reverse channel coefficient calculation (step 509) when it exceeds the threshold.
  • a reverse channel response for the channel obtained through the multipath channel searching is then calculated (step 509), and a received signal of the repeater is filtered (step 510). The filtered signal is then amplified (step 511) and transmitted (step 512).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil et un procédé d'annulation de signal d'interférence de répéteur de communication mobile. Dans un système de communication mobile mettant en oeuvre un système AMRC large bande, lorsqu'un signal de liaison descendante reçu, émis à partir d'une station de base, est introduit dans une antenne de réception d'un répéteur sous forme de signaux d'évanouissement par trajets multiples et qu'un signal transmis à une antenne d'émission du répéteur est également introduit dans l'antenne de réception du répéteur, un appareil destiné à annuler le signal d'interférence, constitué d'une unité de synchronisation initiale, d'une unité de recherche par trajets multiples, d'une unité d'estimation de voie adaptative, d'une unité filtre d'adaptation de voie et d'une unité de commande, est utilisé pour annuler à la fois le signal d'interférence par trajets multiples et le signal inverse par une sélection par trajets multiples et une estimation de voie au moyen de la recherche de signal pilote, ce qui établit un terminal à l'intérieur d'une zone de service du répéteur avec un signal de liaison descendante de haute qualité.
PCT/KR2007/001084 2006-03-06 2007-03-05 Appareil et procede d'annulation de signal d'interference de repeteur de communication mobile Ceased WO2007102684A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20060020941 2006-03-06
KR10-2006-0020941 2006-03-06
KR1020070021379A KR20070091547A (ko) 2006-03-06 2007-03-05 이동통신 무선중계기의 간섭신호 제거 장치 및 방법
KR10-2007-0021379 2007-03-05

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010090437A3 (fr) * 2009-02-03 2010-09-23 Samsung Electronics Co., Ltd. Appareil et procédé d'annulation d'interférence dans un relais mobile bidirectionnel simultané
CN102111355A (zh) * 2010-12-15 2011-06-29 迈普通信技术股份有限公司 一种高速移动环境中实现信号收发的方法和直放站
EP2152042A3 (fr) * 2008-08-08 2012-11-07 Rohde & Schwarz GmbH & Co. KG Methode et relais radio avec couplage rigide en temps entre un dispositif récepteur et émetteur.
RU2480962C2 (ru) * 2008-07-11 2013-04-27 Квэлкомм Инкорпорейтед Синхронная связь на основе tdm в сценариях с доминирующими помехами
US8559485B2 (en) 2010-04-08 2013-10-15 Andrew Llc Autoregressive signal processing for repeater echo cancellation
US9130786B2 (en) 2013-03-15 2015-09-08 Qualcomm Incorporated Device and method for computing a channel estimate
US9609536B2 (en) 2010-04-13 2017-03-28 Qualcomm Incorporated Measurement of received power and received quality in a wireless communication network
CN107852614A (zh) * 2015-05-06 2018-03-27 梁平 具有基于fir的信道均衡器的无线中继器

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5652765A (en) * 1993-08-06 1997-07-29 Ntt Mobile Communications Network Inc. Receiver and repeater for spread spectrum communications
WO2002011301A2 (fr) * 2000-08-01 2002-02-07 Repeater Technologies, Inc. Systeme combineur de temporisation ameliore pour relais cdma et amplificateurs faible bruit
KR20040075160A (ko) * 2003-02-20 2004-08-27 주식회사 네이버스 무선중계기의 전파간섭제거장치 및 그 전파간섭 제거방법
US6879625B1 (en) * 2000-05-22 2005-04-12 Globespanvirata, Inc System and method for providing cancellation of interference in a repeater configuration with remote loop powering

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652765A (en) * 1993-08-06 1997-07-29 Ntt Mobile Communications Network Inc. Receiver and repeater for spread spectrum communications
US6879625B1 (en) * 2000-05-22 2005-04-12 Globespanvirata, Inc System and method for providing cancellation of interference in a repeater configuration with remote loop powering
WO2002011301A2 (fr) * 2000-08-01 2002-02-07 Repeater Technologies, Inc. Systeme combineur de temporisation ameliore pour relais cdma et amplificateurs faible bruit
KR20040075160A (ko) * 2003-02-20 2004-08-27 주식회사 네이버스 무선중계기의 전파간섭제거장치 및 그 전파간섭 제거방법

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2480962C2 (ru) * 2008-07-11 2013-04-27 Квэлкомм Инкорпорейтед Синхронная связь на основе tdm в сценариях с доминирующими помехами
US9485773B2 (en) 2008-07-11 2016-11-01 Qualcomm Incorporated Synchronous TDM-based communication in dominant interference scenarios
US9867203B2 (en) 2008-07-11 2018-01-09 Qualcomm Incorporated Synchronous TDM-based communication in dominant interference scenarios
EP2152042A3 (fr) * 2008-08-08 2012-11-07 Rohde & Schwarz GmbH & Co. KG Methode et relais radio avec couplage rigide en temps entre un dispositif récepteur et émetteur.
WO2010090437A3 (fr) * 2009-02-03 2010-09-23 Samsung Electronics Co., Ltd. Appareil et procédé d'annulation d'interférence dans un relais mobile bidirectionnel simultané
US8559485B2 (en) 2010-04-08 2013-10-15 Andrew Llc Autoregressive signal processing for repeater echo cancellation
US9609536B2 (en) 2010-04-13 2017-03-28 Qualcomm Incorporated Measurement of received power and received quality in a wireless communication network
CN102111355A (zh) * 2010-12-15 2011-06-29 迈普通信技术股份有限公司 一种高速移动环境中实现信号收发的方法和直放站
CN102111355B (zh) * 2010-12-15 2014-05-14 迈普通信技术股份有限公司 一种高速移动环境中实现信号收发的方法和直放站
US9130786B2 (en) 2013-03-15 2015-09-08 Qualcomm Incorporated Device and method for computing a channel estimate
CN107852614A (zh) * 2015-05-06 2018-03-27 梁平 具有基于fir的信道均衡器的无线中继器

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