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WO2009061084A1 - Appareil et procédé de suppression des interférences dans un répéteur sans fil à large bande (wibro) - Google Patents

Appareil et procédé de suppression des interférences dans un répéteur sans fil à large bande (wibro) Download PDF

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Publication number
WO2009061084A1
WO2009061084A1 PCT/KR2008/006211 KR2008006211W WO2009061084A1 WO 2009061084 A1 WO2009061084 A1 WO 2009061084A1 KR 2008006211 W KR2008006211 W KR 2008006211W WO 2009061084 A1 WO2009061084 A1 WO 2009061084A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
received signal
pilot
interference cancellation
feedback channel
Prior art date
Application number
PCT/KR2008/006211
Other languages
English (en)
Inventor
Yeong-Ha Choi
Jong-Won Kim
Kyung-Min Choi
Jun-Bae Ahn
Chong-Hoon Kim
Young-Man Cho
Original Assignee
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
Application filed by Solid Technologies, Inc. filed Critical Solid Technologies, Inc.
Publication of WO2009061084A1 publication Critical patent/WO2009061084A1/fr

Links

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
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • 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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • the following description relates to an interference cancellation system (ICS), and more particularly, to feedback channel interference cancellation for processing interference signals caused by the echo and feedback of output signals in a Wibro repeater.
  • Interference cancellation systems are used to cancel interference signals caused by the echo and feedback of signals output from repeaters so that only original signals without interference signals can be processed.
  • the output signals of the repeater may be fed back to the input terminal, or multi-path signals, etc. formed by reflection of the output signals to obstacles or moving objects, etc. may be fed back to the input terminal, when isolation between the antennas at the input and output terminals is not sufficient.
  • an interference cancellation apparatus and method for cancelling interference from an input signal by estimating the characteristics of a feedback channel based on the input and output signals to estimate an echoic signal and subtracting the echoic signal from the input signal, in a Wibro repeater for relaying a received signal based on orthogonal frequency division multiplexing (OFDM).
  • OFDM orthogonal frequency division multiplexing
  • a Wibro repeater for relaying an input signal after estimating the characteristics of a feedback channel based on the input and output signals to estimate an echoic signal and cancelling the echoic signal from the input signal.
  • a Wibro repeater for relaying a received signal based on Orthogonal Frequency Division Multiplexing (OFDM), including: an interference cancellation unit cancelling an interference signal calculated through feedback channel estimation from the received signal, in a manner to extract an original signal from the received signal by estimating characteristics of the feedback channel using a pilot signal included in the received signal; and an amplifier amplifying the extracted original signal and transmitting the result of the amplification.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the interference cancellation unit estimates the characteristics of the feedback channel by subtracting an original signal calculated based on pre-known information from the received signal, and in a data period of the received signal, the interference cancellation unit estimates the characteristics of the feedback channel by estimating an original signal using the pilot signal, and subtracting the estimated original signal from the received signal.
  • the interference cancellation unit includes: a preamble detector detecting preamble components of the received signal to obtain a synchronizing signal of the received signal and a pattern of the preamble components of the received signal; a map decoder decoding a uplink or downlink map message to obtain information about a location and modulation value of a pilot assigned to each OFDM symbol of the received signal; a reference signal generator generating a reference signal using the synchronizing signal and the information about the location and modulation value of the pilot; a pilot signal processor processing the pilot signal included in the received signal using the reference signal and the synchronizing signal; and a channel estimator estimating the characteristics of the feedback channel using the synchronizing signal, the reference signal and the processed pilot signal.
  • the Wibro repeater further includes a pseudo noise generator for adding pseudo noise to the received signal.
  • an interference cancellation apparatus for cancelling interference components of a feedback channel, in a Wibro repeater for relaying a received signal based on Orthogonal Frequency Division Multiplexing (OFDM), the interference cancelling apparatus includes: a preamble detector detecting preamble components of the received signal to obtain a synchronizing signal of the received signal and a pattern of the preamble components of the received signal; a map decoder decoding a uplink or downlink map massage to obtain information about a location and modulation value of a pilot assigned to each OFDM symbol of the received signal; a reference signal generator generating a reference signal using the synchronizing signal and the information about the location and modulation value of the pilot; a pilot signal processor processing a pilot signal included in the received signal using the reference signal and the synchronizing signal; and a channel estimator estimating characteristics of the feedback channel using the synchronizing signal, the reference signal and the processed pilot signal.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the pilot signal processor estimates the characteristics of the feedback channel, using a pilot signal remaining after performing orthogonal projection on the received signal in a direction of pilot components, and the channel estimator estimates the characteristics of the feedback channel using a Least Mean Square (LMS) algorithm, after subtracting an original signal from the received signal using the synchronizing signal, the reference signal and the processed pilot signal.
  • LMS Least Mean Square
  • an interference cancellation method for cancelling interference components of a feedback channel, in a Wibro repeater for relaying a received signal based on orthogonal frequency division multiplexing (OFDM), the interference cancellation method including: detecting preamble components of the received signal to obtain a synchronizing signal of the received signal and a pattern of the preamble components of the received signal; decoding a uplink or downlink map massage to obtain information about a location and modulation value of a pilot assigned to each OFDM symbol of the received signal; generating a reference signal using the synchronizing signal and the information about the location and modulation value of the pilot; processing a pilot signal included in the received signal using the reference signal and the synchronizing signal; and estimating characteristics of the feedback channel using the synchronizing signal, the reference signal and the processed pilot signal.
  • OFDM orthogonal frequency division multiplexing
  • a Wibro repeater can easily cancel interference signals through a simple structure. That is, when an interference cancellation method according to the present invention is applied over partial frequency bands and full frequency bands, the simulation result shows that RCE values are smaller than in the case of cancelling interference only using the conventional Least Mean Square (LMS) algorithm.
  • LMS Least Mean Square
  • FIG. 1 is a view for explaining a phenomenon where signal interference occurs by a feedback channel in a Wibro repeater.
  • FIG. 2 is a block diagram of a repeater including an interference cancellation unit according to an embodiment.
  • FIG. 3 is a detailed block diagram of the interference cancellation unit illustrated in FIG. 2.
  • FIG. 4 shows a frequency spectrum of a received signal when a projection-based
  • LMS Least Mean Square
  • FIG. 5 is a block diagram of a repeater including a pseudo noise generator and an interference cancellation unit, according to another embodiment.
  • FIG. 6 shows a frequency spectrum of a received signal when the projection-based
  • LMS algorithm is applied on the received signal using pseudo noise inserted into the received signal.
  • FIG. 7 is a flowchart of an interference cancellation method according to an embodiment. Mode for the Invention
  • FIG. 1 is a view for explaining a phenomenon where signal interference occurs by a feedback channel in a Wibro repeater.
  • a repeater 100 receives and amplifies a downlink signal from a base station 110 and then transfers the downlink signal to a plurality of mobile terminals 120a, 120b and 120c. Also, the repeater 100 receives and amplifies a plurality of uplink signals from the mobile terminals 120a, 120b and 120c and then transfers the uplink signals to the base station 110.
  • the downlink signal processed and amplified by the repeater 100 has to be transferred only to the respective mobile terminals 120a, 120b and 120c, but the output signal (that is, the downlink signal) of the repeater 100 may be fed back to the input terminal of the base station 110, due to echoes caused by insufficient isolation between antennas at the input and output terminals of the repeater 100 or due to the reflection of the output signal to obstacles, etc.
  • FIG. 2 is a block diagram of a repeater 100 including an interference cancellation unit 210 according to an embodiment.
  • the repeater 100 includes an interference cancellation unit 210, a delay unit 220, and an amplifier 230.
  • the interference cancellation unit 210 estimates the characteristics of a feedback channel 150 using pilot components included in a received signal, calculates an interference signal through the feedback channel estimation, and then cancel the interference signal from the received signal, thereby restoring an original input signal.
  • the interference cancellation unit 210 estimates the characteristics of the feedback channel 150 by subtracting a pre-known original signal from the received signal in a preamble period of the received signal, and in a data period of the received signal, estimates the characteristics of the feedback channel 150 by estimating an original signal using the pilot components of the received signal and subtracting the estimated original signal from the received signal.
  • the interference cancellation unit 210 may be a finite impulse response (FIR) filter, and the detailed construction and operation of the interference cancellation unit 210 will be described later with reference to FIG. 3.
  • FIR finite impulse response
  • the delay unit 220 delays a signal that is to be input to the interference cancellation unit 210, and matches the timing of the delayed signal with the timing of a signal input to the repeater 100.
  • the amplifier 230 amplifies the restored original signal from which interference has been cancelled by the interference cancellation unit 210, and transmits the amplified original signal.
  • FIG. 3 is a detailed block diagram of the interference cancellation unit 210 illustrated in FIG. 2.
  • the interference cancellation unit 210 includes a preamble detector 310, a reference signal generator 320, a pilot signal processor 330, a channel estimator 340, and a map decoder 350.
  • the preamble detector 310 detects preamble components of a received signal to obtain a synchronizing signal of the received signal and a pattern of the preamble components.
  • the map decoder 350 decodes an uplink or downlink map message to obtain information about the location and modulation value of a pilot included in each orthogonal frequency division multiplexing (OFDM) symbol of the received signal.
  • the reference signal generator 320 generates a reference signal, using the synchronizing signal and the locations and modulation values of pilots included in the OFDM symbols of the received signal.
  • the reference signal is generated in different ways in the preamble and data periods.
  • a reference signal is generated by detecting the pattern of preamble components.
  • a reference signal is an OFDM signal consisting of only pilot frequency components except for data frequency components.
  • a reference signal is generated for each data symbol, by performing Binary Phase Shift Key (BPSK) modulation using the modulation values of pilots obtained from the uplink or downlink map message to obtain BPSK symbols, mapping the BPSK symbols respectively to the pilot components obtained from the map message, performing Inverse Fast Fourier Transform (IFFT) on the result of the mapping, and then inserting Cyclic Prefixes (CPs) respectively into the results of the IFFT.
  • BPSK Binary Phase Shift Key
  • IFFT Inverse Fast Fourier Transform
  • the pilot signal processor 330 processes a pilot signal included in the received signal, using the reference signal and the synchronizing signal.
  • the pilot signal processor 330 performs orthographic projection on the received signal in the direction of the pilot components, thus extracting only the pilot signal from the received signal.
  • the channel estimator 340 estimates the characteristics of a feedback channel, using the synchronizing signal, the reference signal and the pilot signal. In more detail, the channel estimator 340 subtracts an original signal from the received signal and then estimates the characteristics of the feedback channel using the Least Mean Square (LMS) algorithm. In other words, the channel estimator 340 estimates the characteristics of the feedback channel by estimating a coefficient of a FIR filter for modeling a feedback channel using the LMS algorithm.
  • LMS Least Mean Square
  • FIG. 4 shows a frequency spectrum of a received signal when a projection-based
  • LMS Least Mean Square
  • FIG. 5 is a block diagram of a repeater 100 including a pseudo noise generator 250 and an interference cancellation unit 210, according to another embodiment.
  • the repeater 100 illustrated in FIG. 5 further includes the pseudo noise generator
  • the pseudo noise generator 250 generates pseudo noise for a received signal and adds the pseudo noise to the received signal, when the received signal uses partial frequency bands.
  • the interference cancellation apparatus since the interference cancellation apparatus according to the current embodiment estimates a feedback channel using only a pilot signal, except for the preamble period, the interference cancellation capability at partial frequency bands is lower than that at full frequency bands. Accordingly, in the current embodiment, pseudo noise is added to empty areas where no data or signal exists so that the interference cancellation capability of signals of partial frequency bands having a relatively small number of pilot subcarriers can be improved.
  • the locations (that is, frequencies) of pilot subcarriers and data subcarriers are detected from the symbols of a received signal.
  • QPSK Quadrature Phase Shift Keying
  • QPSK symbols having an energy level required for amplification are generated, and the QPSK symbols are mapped to the remaining subcarriers except for the data, pilot subcarriers and guide band subcarriers.
  • IFFT Inverse Fast Fourier Transform
  • CPs Cyclic Prefixes
  • the generated pseudo noise (that is, the OFDM symbols) is added to the output signal of the repeater 100, generated at the same time as when the pseudo noise is generated.
  • FIG. 6 shows a frequency spectrum of a received signal when the projection-based
  • LMS algorithm is applied on the received signal using pseudo noise inserted into the received signal.
  • FIG. 7 is a flowchart of an interference cancellation method according to an embodiment.
  • preamble components of a received signal are detected to obtain a synchronizing signal of the received signal and a pattern of the preamble components (operation S710). Then, a downlink or uplink map massage is decoded, so that information about the locations and modulation values of pilots included in the received signal is obtained (operation S720). Next, a reference signal is generated using the synchronizing signal (operation S730). Then, a pilot signal included in the received signal is processed using the reference signal and the synchronizing signal (operation S740). In operation S740, orthographic projection is performed on the received signal in the direction of the pilot components so as to leave only the pilot components.
  • the characteristics of a feedback channel are estimated using the synchronizing signal, reference signal, and processed pilot components (operation S750). That is, the characteristics of the feedback is estimated by subtracting a pre-known original signal from the received signal in the preamble period of the received signal, and in the data period of the received signal, by estimating an original signal using the pilot signal, and subtracting the estimated original signal from the received signal.
  • the respective operations of the interference cancellation method according to the current embodiment correspond to the operations of the respective elements of the interference cancellation apparatus as described above with reference to FIGS. 2 and 3.
  • the interference cancellation method can be written as a program. Program codes and code segments constructing the program can be easily inferred by computer programmers skilled in this art.
  • the programs can be stored in a computer-readable recording medium.
  • the computer-readable medium includes a magnetic recording medium, an optical recording medium, and a carrier- wave medium.
  • an interference cancellation apparatus and method according to the present invention can be applied to wireless communications systems and repeaters.

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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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un appareil de suppression des interférences d'un circuit de retour et un procédé de traitement des signaux d'interférence provoquées par l'écho et le retour d'un signal de sortie dans un répéteur sans fil à large bande (Wibro). Le répéteur sans fil à large bande (Wibro) destiné à transmettre un signal reçu fondé sur le multiplexage par répartition orthogonale de la fréquence, comprend: une unité de suppression des interférences servant à supprimer un signal d'interférence calculé par une estimation du circuit de retour à partir du signal reçu, de manière à extraire un signal d'origine à partir du signal reçu grâce à l'estimation des caractéristiques du circuit de retour au moyen d'un signal pilote contenu dans le signal reçu; et un amplificateur servant à amplifier le signal d'origine extrait et à transmettre le résultat de l'amplification.
PCT/KR2008/006211 2007-11-05 2008-10-21 Appareil et procédé de suppression des interférences dans un répéteur sans fil à large bande (wibro) WO2009061084A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070112041A KR100953117B1 (ko) 2007-11-05 2007-11-05 와이브로 중계기에서의 피드백 채널 간섭제거장치 및 그방법, 이를 구비한 중계기
KR10-2007-0112041 2007-11-05

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010147280A1 (fr) * 2009-06-16 2010-12-23 주식회사 쏠리테크 Répéteur sans fil et procédé permettant d'éliminer le signal d'écho de ce dernier
US8364076B2 (en) 2009-09-18 2013-01-29 Electronics And Telecommunications Research Institute Apparatus and method of feedback cancellation for radio signal
WO2013052406A1 (fr) * 2011-10-07 2013-04-11 Qualcomm Incorporated Système, appareil et procédé de génération de signal pilote de répéteur dans des systèmes de communication sans fil
US8606175B2 (en) 2009-11-30 2013-12-10 Electronics And Telecommunications Research Institute RF relay of full-duplex and method for removing interference of EM level thereof
US9338031B2 (en) 2009-08-17 2016-05-10 Qualcomm Incorporated Methods and apparatus for interference decrease/cancellation on downlink acquisition signals
US9590690B2 (en) 2014-12-18 2017-03-07 Motorola Solutions, Inc. Methods and systems for canceling a blocking signal to obtain a desired signal
EP3593456A4 (fr) * 2017-03-07 2020-12-09 Indian Institute of Technology Madras Procédé et système d'annulation d'auto-brouillage par un noeud dans un système de communication sans fil

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KR101232598B1 (ko) * 2009-04-21 2013-02-12 한국전자통신연구원 노드간 동기 획득 방법 및 장치, 다중 물리 채널 구성 방법
KR101584481B1 (ko) * 2015-01-21 2016-01-22 명지대학교 산학협력단 전이중 방식의 통신 장치 및 이의 제어 방법
KR102397493B1 (ko) * 2020-11-02 2022-05-13 주식회사 티제이이노베이션 간섭 기지국 신호 제거 중계 장치 및 방법
KR102417563B1 (ko) * 2020-12-10 2022-07-06 주식회사 랜컴테크놀로지 무선 중계 장치 및 방법
KR102417564B1 (ko) * 2020-12-10 2022-07-06 주식회사 랜컴테크놀로지 무선 중계 장치 및 방법

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US6385435B1 (en) * 2000-04-20 2002-05-07 Jhong Sam Lee Coupled interference concellation system for wideband repeaters in a cellular system
US6934511B1 (en) * 1999-07-20 2005-08-23 Andrew Corporation Integrated repeater

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KR100528275B1 (ko) * 2003-01-06 2005-11-15 주식회사 케이티프리텔 이동통신 중계기에서의 간섭 제거 장치
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US6934511B1 (en) * 1999-07-20 2005-08-23 Andrew Corporation Integrated repeater
US6385435B1 (en) * 2000-04-20 2002-05-07 Jhong Sam Lee Coupled interference concellation system for wideband repeaters in a cellular system
KR20010090039A (ko) * 2001-08-21 2001-10-18 박상열 궤환기법을 응용한 실시간 자력적/적응성 간섭잡음제거장치 및 그 방법

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010147280A1 (fr) * 2009-06-16 2010-12-23 주식회사 쏠리테크 Répéteur sans fil et procédé permettant d'éliminer le signal d'écho de ce dernier
US9338031B2 (en) 2009-08-17 2016-05-10 Qualcomm Incorporated Methods and apparatus for interference decrease/cancellation on downlink acquisition signals
US8364076B2 (en) 2009-09-18 2013-01-29 Electronics And Telecommunications Research Institute Apparatus and method of feedback cancellation for radio signal
US8606175B2 (en) 2009-11-30 2013-12-10 Electronics And Telecommunications Research Institute RF relay of full-duplex and method for removing interference of EM level thereof
WO2013052406A1 (fr) * 2011-10-07 2013-04-11 Qualcomm Incorporated Système, appareil et procédé de génération de signal pilote de répéteur dans des systèmes de communication sans fil
US8934398B2 (en) 2011-10-07 2015-01-13 Qualcomm Incorporated System, apparatus, and method for repeater pilot signal generation in wireless communication systems
US9590690B2 (en) 2014-12-18 2017-03-07 Motorola Solutions, Inc. Methods and systems for canceling a blocking signal to obtain a desired signal
EP3593456A4 (fr) * 2017-03-07 2020-12-09 Indian Institute of Technology Madras Procédé et système d'annulation d'auto-brouillage par un noeud dans un système de communication sans fil

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