+

WO2010061993A1 - Appareil et procédé d'acquisition de synchronisation de trame - Google Patents

Appareil et procédé d'acquisition de synchronisation de trame Download PDF

Info

Publication number
WO2010061993A1
WO2010061993A1 PCT/KR2008/007067 KR2008007067W WO2010061993A1 WO 2010061993 A1 WO2010061993 A1 WO 2010061993A1 KR 2008007067 W KR2008007067 W KR 2008007067W WO 2010061993 A1 WO2010061993 A1 WO 2010061993A1
Authority
WO
WIPO (PCT)
Prior art keywords
training symbol
synchronization
domain
training
fft
Prior art date
Application number
PCT/KR2008/007067
Other languages
English (en)
Inventor
Seung-Won Choi
Seung-Heon Hyeon
Tae-Youl Oh
Hyoung-Seok Kim
Original Assignee
Sas Technologies Co., Ltd.
Industry-University Cooperation Foundation Hanyang University
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 Sas Technologies Co., Ltd., Industry-University Cooperation Foundation Hanyang University filed Critical Sas Technologies Co., Ltd.
Priority to PCT/KR2008/007067 priority Critical patent/WO2010061993A1/fr
Priority to KR1020117011891A priority patent/KR101452563B1/ko
Publication of WO2010061993A1 publication Critical patent/WO2010061993A1/fr

Links

Classifications

    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • 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
    • H04L7/042—Detectors therefor, e.g. correlators, state machines

Definitions

  • the present invention relates to technology for acquiring frame synchronization in an orthogonal frequency division multiplexing (OFDM)-based system.
  • OFDM orthogonal frequency division multiplexing
  • An orthogonal frequency division multiplexing (OFDM)-based system uses a training symbol that a transmitter and a receiver know to indicate the start of a frame. The receiver must find the training symbol, which indicates the start of the frame, so that the transmitter and the receiver can perform normal communication.
  • the present invention relates to technology for acquiring frame synchronization in an OFDM-based system.
  • FIG. 1 is a block diagram illustrating a conventional method of acquiring synchronization.
  • frame synchronization is acquired using a method of calculating a correlation value with respect to a received training symbol to find a maximum position.
  • the present invention suggests an accurate and stable method of acquiring frame synchronization by detecting a maximum position according to each path and obtaining the position of a signal received through the first path.
  • the present invention is directed to accurately and stably acquiring frame synchronization.
  • an initial synchronization process is required to perform communication between a transmitter and a receiver.
  • the receiver must detect a first signal of a frame consisting of a predetermined training symbol.
  • a correlator is prepared to acquire synchronization using a time-domain signal before a fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • ISI inter-symbol interference
  • the present invention suggests a synchronization acquiring method that uses a conventional correlation value of a time-domain signal before FFT and detects a position delayed according to each path to eliminate ISI in a multipath environment. Also, when only a conventional correlator is used, it is difficult to obtain a precise maximum position. However, when delayed positions are detected according to paths using the suggested method, an accurate synchronization position can be obtained, and thus it is possible to find a stable synchronization position.
  • the present invention can accurately recognize frame synchronization of a signal received through a first path in a multipath channel environment in comparison with conventional art, and thus it is possible to know a start time point of a frame and prevent inter-symbol interference (ISI), which is fatal to an orthogonal frequency division multiplexing (OFDM) system.
  • ISI inter-symbol interference
  • OFDM orthogonal frequency division multiplexing
  • FIG. 1 is a block diagram illustrating a conventional method of acquiring frame synchronization.
  • FIG. 2 is a block diagram illustrating a suggested method of acquiring frame synchronization.
  • FIG. 3 is a simulation result obtained when only a correlator is used according to a conventional method.
  • FIG. 4 is a simulation result obtained when the suggested method is applied to the conventional method.
  • the present invention involves receiving training symbols passed through channels via an antenna, calculating correlation values between a training symbol in the time domain and received signals, determining the largest one of the correlation values as a position at which the training symbol is located, informing the position to a synchronization tracker, removing a protection section according to the position, and then performing a fast Fourier transform (FFT) to analyze the signal in the frequency domain.
  • FFT fast Fourier transform
  • a first symbol of a frame is a training symbol that a transmitter and a receiver know.
  • the transmitter performs an inverse FFT (IFFT) on a frequency-domain value
  • Equation (2) A training symbol p(n) in the time domain transmitted after the IFFT-processed value is delayed as shown in Equation (2) and received by the receiver.
  • the receiver calculates a correlation value with respect to the training symbol in the time domain and finds a maximum position. [22] Based on the found maximum position, a protection section is eliminated from the received signal, and an FFT is performed on the signal. [23] N-I rN-1
  • Equation (3) is expanded into Equation (4) below. [25] N-I
  • Equation (4) is a result obtained after the FFT, in which the training symbol
  • Equation (5) When an IFFT is performed on a value obtained by multiplying Equation (4) by the training symbol in the frequency domain, Equation (5) is obtained.
  • Equation (5) is a result obtained in a single path
  • Equation (6) is an IFFT result obtained when multiple paths exist. _ ,,) ⁇ , ⁇
  • FIG. 2 is a block diagram illustrating a suggested method of acquiring frame synchronization.
  • a suggested apparatus for acquiring orthogonal frequency division multiple access (OFDMA) downlink frame synchronization includes
  • [35] a time-domain training symbol table storing a time-domain value of a training symbol used in common by a transmitter and a receiver
  • [41] a frequency-domain training symbol table storing a frequency-domain value of a training symbol used in common by the transmitter and the receiver,
  • a transmitter transmits a training symbol that a receiver also knows at the beginning of a frame to inform the start of the frame to the receiver.
  • the receiver receives the training symbol passed through a channel via an antenna, and the received signal undergoes down conversion, demodulation, and analog/digital (AfD) conversion and becomes a baseband signal.
  • AfD analog/digital
  • a synchronization process may be divided by an initial synchronization acquirer and a synchronization tracker.
  • the initial synchronization acquirer calculates correlation values between a training symbol in the time domain that the receiver knows and received signals.
  • the initial synchronization acquirer determines the largest one of the correlation values as a position at which the training symbol is located, and informs the position to the synchronization tracker.
  • the synchronization tracker eliminates a protection section with respect to the position informed by the initial synchronization acquirer and then performs an FFT to analyze the signals in the frequency domain.
  • a signal output after the FFT consists of a training symbol term and a term generated by delay. Due to the training symbol eliminator, only the term generated by delay can be obtained from the signal.
  • the training symbol eliminator multiplies the input signal by the training symbol in the frequency domain that the receiver already knows and makes a sign, thereby removing the training symbol term.
  • An IFFT is performed on the signal that has only the phase rotation term generated by delay due to the training symbol eliminator so that a delayed position can be detected.
  • the degree of delay can be detected according to the paths, and thus the synchronization position determiner can obtain the position of the first path.
  • the present invention can be used to acquire accurate and stable frame synchronization in an OFDM-based system.

Landscapes

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

Abstract

La présente invention porte sur un appareil et un procédé d'acquisition de synchronisation de trame. Le procédé consiste à : recevoir un symbole d'apprentissage par l'intermédiaire d'un canal, calculer des valeurs de corrélation entre le symbole d'apprentissage et des symboles reçus dans le domaine temporel, déterminer une position de symbole d'apprentissage ayant la valeur de corrélation maximale, indiquer la position de symbole d'apprentissage à un dispositif de suivi de synchronisation et exécuter une transformation de Fourier rapide (FFT) pour analyser les signaux reçus dans le domaine fréquentiel après élimination d'un bloc de protection selon la position de symbole d'apprentissage.
PCT/KR2008/007067 2008-11-28 2008-11-28 Appareil et procédé d'acquisition de synchronisation de trame WO2010061993A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/KR2008/007067 WO2010061993A1 (fr) 2008-11-28 2008-11-28 Appareil et procédé d'acquisition de synchronisation de trame
KR1020117011891A KR101452563B1 (ko) 2008-11-28 2008-11-28 프레임 동기 획득 장치 및 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/007067 WO2010061993A1 (fr) 2008-11-28 2008-11-28 Appareil et procédé d'acquisition de synchronisation de trame

Publications (1)

Publication Number Publication Date
WO2010061993A1 true WO2010061993A1 (fr) 2010-06-03

Family

ID=42225847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/007067 WO2010061993A1 (fr) 2008-11-28 2008-11-28 Appareil et procédé d'acquisition de synchronisation de trame

Country Status (2)

Country Link
KR (1) KR101452563B1 (fr)
WO (1) WO2010061993A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9937566B2 (en) 2014-12-23 2018-04-10 Hsin-Tien Chang Spirally-fed drilling and milling cutter
CN107995640A (zh) * 2018-01-26 2018-05-04 重庆邮电大学 一种小区接收信号功率测量方法
CN109586835A (zh) * 2018-10-19 2019-04-05 四川安迪科技实业有限公司 一种连续成对载波多址通信接收机自干扰对消器同步方法
CN111224908A (zh) * 2018-11-26 2020-06-02 展讯通信（上海）有限公司 信号序列的检测方法及装置、存储介质、终端

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100471538B1 (ko) * 2002-09-18 2005-02-21 한기열 오에프디엠 시스템의 채널추정과 심볼동기 타이밍결정장치 및 방법
KR100635013B1 (ko) * 2004-12-03 2006-10-16 한국전자통신연구원 다중 셀 환경에서의 동기식 ｏｆｄｍ 수신 장치 및 그방법
KR100739552B1 (ko) * 2005-11-07 2007-07-16 엘지전자 주식회사 직교주파수다중분할방식의 전송신호 수신장치
KR20070120380A (ko) * 2006-06-19 2007-12-24 주식회사 팬택앤큐리텔 복수의 동기화 심벌을 이용한 프레임 타이밍 추정 및 방송정보 추출 방법, 상기 방법을 지원하는 송신기, 수신기장치 및 이동통신 시스템

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020086161A (ko) * 2001-05-11 2002-11-18 에스케이 텔레콤주식회사 직교 주파수 분할 다중 전송 시스템의 훈련 심볼 결정방법 및 주파수 옵셋 추정과 동기를 위한 장치 및 방법
KR100510861B1 (ko) * 2003-01-18 2005-08-31 디지피아(주) 직교 주파수 분할 다중 전송 시스템에서의 훈련 신호 결정방법 및 그 훈련 신호를 이용한 직교 주파수 분할 다중수신기와 수신 방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100471538B1 (ko) * 2002-09-18 2005-02-21 한기열 오에프디엠 시스템의 채널추정과 심볼동기 타이밍결정장치 및 방법
KR100635013B1 (ko) * 2004-12-03 2006-10-16 한국전자통신연구원 다중 셀 환경에서의 동기식 ｏｆｄｍ 수신 장치 및 그방법
KR100739552B1 (ko) * 2005-11-07 2007-07-16 엘지전자 주식회사 직교주파수다중분할방식의 전송신호 수신장치
KR20070120380A (ko) * 2006-06-19 2007-12-24 주식회사 팬택앤큐리텔 복수의 동기화 심벌을 이용한 프레임 타이밍 추정 및 방송정보 추출 방법, 상기 방법을 지원하는 송신기, 수신기장치 및 이동통신 시스템

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9937566B2 (en) 2014-12-23 2018-04-10 Hsin-Tien Chang Spirally-fed drilling and milling cutter
CN107995640A (zh) * 2018-01-26 2018-05-04 重庆邮电大学 一种小区接收信号功率测量方法
CN107995640B (zh) * 2018-01-26 2019-11-19 重庆邮电大学 一种小区接收信号功率测量方法
CN109586835A (zh) * 2018-10-19 2019-04-05 四川安迪科技实业有限公司 一种连续成对载波多址通信接收机自干扰对消器同步方法
CN109586835B (zh) * 2018-10-19 2020-03-17 四川安迪科技实业有限公司 一种连续成对载波多址通信接收机自干扰对消器同步方法
CN111224908A (zh) * 2018-11-26 2020-06-02 展讯通信（上海）有限公司 信号序列的检测方法及装置、存储介质、终端

Also Published As

Publication number Publication date
KR20110098999A (ko) 2011-09-05
KR101452563B1 (ko) 2014-10-23

Similar Documents

Publication Publication Date Title
US7027429B2 (en) Method and apparatus for time and frequency synchronization of OFDM communication systems
CN105024791B (zh) 物理帧中前导符号的生成方法
CN103379082B (zh) Lte通信系统中的时频同步方法和装置
US8265184B2 (en) Digital communications receiver and method of estimating residual carrier frequency offset in a received signal
CN105007146B (zh) 物理帧中前导符号的生成方法
CN109428847B (zh) NB-IoT系统中下行次同步信号的检测与同步方法及装置
CN104902560B (zh) 一种下行定时同步方法及装置
CN107317779B (zh) 一种频偏估计方法和装置
CN108989259B (zh) 无线综测仪窄带物理上行共享信道的时偏估计方法及系统
WO2010061993A1 (fr) Appareil et procédé d'acquisition de synchronisation de trame
CN102832981B (zh) 一种确定时间同步位置的方法及设备
KR20060079743A (ko) 가변 길이의 보호구간을 사용하는 오에프디엠 기반에서의보호구간의 길이 검출 방법 및 그 장치
KR101257015B1 (ko) 타이밍 동기화를 위한 다중 단계 타이밍 옵셋 추정 방법 및 ｏｆｄｍ 수신기
CN106921450B (zh) 一种信噪比估计方法及装置
KR101074840B1 (ko) 무선랜 수신단에서의 동기 추정 장치 및 그 방법
US9749124B2 (en) Symbol boundary detection
KR101284533B1 (ko) 정수배 주파수 오차 추정 및 셀 ｉｄ 인덱스 검출 장치 및 방법
KR102792891B1 (ko) Ofdm 기반 통신 시스템에서의 순환 쉬프트 추정 기법
KR20170091030A (ko) Ofdm 기반의 dab 시스템 및 그것을 이용한 모드 및 프레임 동기 방법
CN108075998B (zh) 适用于导频辅助ofdm符号同步方法和系统
US20160286513A1 (en) Time-varying channel discriminating device and method thereof
JP6586151B2 (ja) 測定装置及び測定方法
KR101257014B1 (ko) 샘플 표준 편차를 기초로 한 다중 경로 페이딩 채널에서 ｏｆｄｍ 시스템을 위한 타이밍 옵셋 추정 방법 및 이러한 방법을 사용하는 장치
KR100977557B1 (ko) 직교 주파수 분할 다중화 시스템의 시변 채널 추정 장치 및방법
KR20230090121A (ko) 5g 통신 시스템용 심볼 타이밍 오차 추정 장치 및 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08878456

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20117011891

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08878456

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载