KR960027854A - 확산 스펙트럼형 수신기내의 역확산 코드 위상 검출 장치 - Google Patents

확산 스펙트럼형 수신기내의 역확산 코드 위상 검출 장치 Download PDF

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KR960027854A
KR960027854A KR1019950072148A KR19950072148A KR960027854A KR 960027854 A KR960027854 A KR 960027854A KR 1019950072148 A KR1019950072148 A KR 1019950072148A KR 19950072148 A KR19950072148 A KR 19950072148A KR 960027854 A KR960027854 A KR 960027854A
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correlation
despread
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KR100199237B1 (ko
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도모야 가쿠
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가네꼬 히사시
닛폰 덴키 가부시키가이샤
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • H04B1/70755Setting of lock conditions, e.g. threshold
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/709Correlator structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7115Constructive combining of multi-path signals, i.e. RAKE receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception

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

Abstract

확산 스펙트럼 변조를 거친 데이타 신호와 파일럿 신호를 수신하고, 파일럿 신호를 역환산 처리함으로 복조에 사용된 서로다른 많은 역확산 코드들을 검출하며, 많은 역확산 코드를 사용하여 데이타 신호의 역확산 변조를 각기 수행하고, 위상 매칭에 따른 출력에 대해 가중치 처리를 행하고, 출력을 동기화시키고, 최종 데이타를 출력시키는, 라케 동기화 복조 기능을 갖는 SS 수신기내의 역확산 코드 위상 검출 장치는 탐색 상관기, 탐색 처리 제어부와 탐색 처리부를 포함한다. 탐색 상관기는 역확산 코드의 위상들을 순차적으로 변환시키는 동시에 파이럿 신호와 역확산 코드의 상관 결과를 얻는다. 탐색 처리 제어부는 탐색 상관기로부터 순차적으로 나온 상관 결과 출력을 수신하고 상관 결과를 최대치로 뽑아낸다. 탐색 처리 제어부에 의해 감소하는 순으로 뽑아낸 상관 결과로부터 많은 결과를 얻음으로써 복조에 사용된 많은 역확산 코드 위상들을 검출한다.

Description

확산 스펙트럼형 수신기내의 역확산 코드 위상 검출 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제6도는 본 발명의 실시가 응용된 SS 수신기의 구조를 보여주는 도면, 제7도는 제6도에 있는 SS 수신기내의 탐색 과정 제어부와 탐색 처리부에 의해 수행된 과정의 예를 보여주는 플로우-차트, 제8도는 복조와 탐색 결과를 위해 사용된 역확산 코드 위상들을 얻기 위한 과정에 있어서, 본 발명과 종래의 기술에 있는 탐색 과정 수행의 형태를 보여주는 도면.

Claims (3)

  1. 확산 스펙트럼 변조를 거친 데이타 신호와 파일럿 신호를 수신하고, 파일럿 신호를 역환산 처리함으로써 복조에 사용된 서로다른 많은 역환산 코드 위상들을 검출하며, 많은 역확산 코드 위상들을 이용하여 데이타 신호의 역확산 변조를 각기 행하며, 위상 매칭에 따른 출력에 대해 가중치 처리를 행하며, 출력을 동기화시키고, 최종 데이타를 출력시키는 라케 동기화 복조 기능을 갖는 확산 스펙트럼 수식내의 역확산 코드 위상 검출 장치는, 역확산 코드의 위상을 순차적으로 변화시키면서 파일럿 신호와 역확산 코드의 상관 결과를 얻는 탐색 상관기와, 상기의 탐색 상관기로부터 순차적으로 나온 상관 결과들의 출력을 수신하고, 최대치인 상관 결과들을 제어부와 출력하는 탐색 처리 제어부에 의해 감소하는 값순으로 뽑아낸 상관 결과들로부터 다수의 상관 결과를 얻음으로써 복조에 사용된 많은 역환산 코드 위상들을 검출하는 탐색 처리부를 포함하는 역확산 코드 위상 검출 장치.
  2. 제1항에 있어서, 상기 탐색 처리 제어부는 상기의 탐색 상관기로부터 나온 상관 결과 출력과 바로 이전과 뒤의 상관 결과들을 비교함으로써, 최대치인 상관결과를 결정하는 역확산 코드 위상 검출 장치.
  3. 제2항에 있어서, 상기 탐색으로부터 나온 상관 결과에 근거하여 기준점을 설정하기 위한 기준점 설정수단을 더 포함하며, 상기 탐색 처리 제어부는 상기의 기준점 설정 수단에 의하여 설정된 기준을 넘고 이전과 이후의 상관 결과보다 큰 상관 결과를 추출하는 역확산 코드 위상 검출 장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019950072148A 1994-12-22 1995-12-22 확산 스펙트럼형 수신기 내의 역확산 코드 위상 검출 장치 KR100199237B1 (ko)

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JP94-336174 1994-12-22
JP33617494A JP2605648B2 (ja) 1994-12-22 1994-12-22 Ss受信機における逆拡散符号位相検出装置

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KR960027854A true KR960027854A (ko) 1996-07-22
KR100199237B1 KR100199237B1 (ko) 1999-06-15

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EP (1) EP0718998A3 (ko)
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Families Citing this family (82)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7929498B2 (en) 1995-06-30 2011-04-19 Interdigital Technology Corporation Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
ZA965340B (en) 1995-06-30 1997-01-27 Interdigital Tech Corp Code division multiple access (cdma) communication system
US6831905B1 (en) 1995-06-30 2004-12-14 Interdigital Technology Corporation Spread spectrum system assigning information signals to message-code signals
US6816473B2 (en) 1995-06-30 2004-11-09 Interdigital Technology Corporation Method for adaptive forward power control for spread-spectrum communications
US7020111B2 (en) 1996-06-27 2006-03-28 Interdigital Technology Corporation System for using rapid acquisition spreading codes for spread-spectrum communications
US6885652B1 (en) 1995-06-30 2005-04-26 Interdigital Technology Corporation Code division multiple access (CDMA) communication system
FI100494B (fi) 1995-11-20 1997-12-15 Nokia Telecommunications Oy Menetelmä vastaanottimen ohjaamiseksi ja vastaanotin
JP3337613B2 (ja) * 1996-03-05 2002-10-21 シャープ株式会社 スペクトル拡散通信システム
US5903596A (en) * 1996-05-16 1999-05-11 Nakano; Takayuki Spread spectrum demodulation unit
CA2210582C (en) * 1996-07-24 2001-01-30 Ntt Mobile Communications Network Inc. Method and apparatus for receiving cdma radio communication
JP3447897B2 (ja) * 1996-08-20 2003-09-16 松下電器産業株式会社 Cdma無線通信装置
US6002709A (en) * 1996-11-21 1999-12-14 Dsp Group, Inc. Verification of PN synchronization in a direct-sequence spread-spectrum digital communications system
JPH10200506A (ja) * 1997-01-06 1998-07-31 Sony Corp 受信装置及び受信方法、並びに無線システムの端末装置
US6289041B1 (en) * 1997-02-11 2001-09-11 Snaptrack, Inc. Fast Acquisition, high sensitivity GPS receiver
US6724738B1 (en) 1997-02-27 2004-04-20 Motorola Inc. Method and apparatus for acquiring a pilot signal in a CDMA receiver
US6144649A (en) * 1997-02-27 2000-11-07 Motorola, Inc. Method and apparatus for acquiring a pilot signal in a CDMA receiver
JP3242860B2 (ja) * 1997-04-08 2001-12-25 シャープ株式会社 スペクトル直接拡散通信システムにおける相関同期回路
JP2853705B2 (ja) 1997-05-07 1999-02-03 日本電気株式会社 スペクトラム拡散通信受信機
JP2856249B2 (ja) * 1997-06-24 1999-02-10 日本電気株式会社 Cdma同期捕捉回路
JP3274388B2 (ja) * 1997-07-25 2002-04-15 株式会社東芝 Rake受信機とこのrake受信機を備えたスぺクトラム拡散通信装置
US6078570A (en) * 1997-08-21 2000-06-20 Nokia Mobile Phones Limited Mobile assisted hard hand-off for a code division multiple access (CDMA) system
US6144691A (en) * 1997-09-30 2000-11-07 Nokia Mobile Phones Limited Method and apparatus for synchronizing to a direct sequence spread spectrum signal
JP3793632B2 (ja) * 1997-12-18 2006-07-05 松下電器産業株式会社 セルサーチ方法及び移動局装置
JP3333454B2 (ja) * 1997-12-20 2002-10-15 松下電器産業株式会社 相関検出装置及び相関検出装置の逆拡散符号切換え方法
JP3305639B2 (ja) * 1997-12-24 2002-07-24 株式会社エヌ・ティ・ティ・ドコモ 直接拡散cdma伝送方式におけるrake受信機
JP2894340B1 (ja) 1998-03-04 1999-05-24 日本電気株式会社 スペクトラム拡散通信方式
JP3484072B2 (ja) * 1998-04-14 2004-01-06 株式会社日立国際電気 逆拡散回路
JP3260716B2 (ja) * 1998-06-05 2002-02-25 松下電器産業株式会社 送信装置及びそれを用いた基地局装置
US6229842B1 (en) 1998-07-16 2001-05-08 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive path selection threshold setting for DS-CDMA receivers
JP3031351B2 (ja) 1998-09-24 2000-04-10 日本電気株式会社 Cdma受信装置及びそれに用いるパス検出方法並びにその制御プログラムを記録した記録媒体
JP3031354B1 (ja) 1998-09-30 2000-04-10 日本電気株式会社 Cdma受信装置及びそのマルチパスのフィンガ割り当て方法並びにその制御プログラムを記録した記録媒体
US6560273B1 (en) * 1998-10-07 2003-05-06 Ericsson Inc. Delay searcher and delay trackers interaction for new delays assignment to rake fingers
JP3904754B2 (ja) 1999-02-25 2007-04-11 富士通株式会社 符号分割多重通信における送信装置、受信装置及びその方法
WO2000052863A1 (fr) * 1999-03-01 2000-09-08 Fujitsu Limited Recepteur amrc
KR100294711B1 (ko) * 1999-03-15 2001-07-12 서평원 최적의 파일럿 심볼을 이용한 프레임 동기 방법
US7012906B1 (en) * 1999-03-15 2006-03-14 Lg Information & Communications, Ltd. Pilot signals for synchronization and/or channel estimation
US6721299B1 (en) * 1999-03-15 2004-04-13 Lg Information & Communications, Ltd. Pilot signals for synchronization and/or channel estimation
US6791960B1 (en) 1999-03-15 2004-09-14 Lg Information And Communications, Ltd. Pilot signals for synchronization and/or channel estimation
US7643540B2 (en) * 1999-03-15 2010-01-05 Lg Electronics Inc. Pilot signals for synchronization and/or channel estimation
US7496132B2 (en) * 1999-03-15 2009-02-24 Kg Electronics Inc. Pilot signals for synchronization and/or channel estimation
US6704348B2 (en) 2001-05-18 2004-03-09 Global Locate, Inc. Method and apparatus for computing signal correlation at multiple resolutions
JP3344478B2 (ja) * 1999-07-16 2002-11-11 日本電気株式会社 Cdmaセルラシステムにおけるパスサーチ回路
JP3329379B2 (ja) * 1999-09-09 2002-09-30 日本電気株式会社 周波数制御方法および受信機
DE69933949T2 (de) * 1999-09-14 2007-07-12 Fujitsu Ltd., Kawasaki Cdma-empfänger
JP3961828B2 (ja) 1999-09-22 2007-08-22 富士通株式会社 送信電力制御装置
JP3279297B2 (ja) * 1999-09-24 2002-04-30 日本電気株式会社 Cdma移動通信受信方式におけるサーチ方法および受信装置
CN100423521C (zh) * 1999-11-08 2008-10-01 三洋电机株式会社 无线接收系统及同步检测方法
JP3943305B2 (ja) * 2000-01-19 2007-07-11 三菱電機株式会社 スペクトル拡散受信装置、およびスペクトル拡散受信方法
JP3468189B2 (ja) 2000-02-02 2003-11-17 日本電気株式会社 パターン生成回路及びそれを用いたマルチパス検出回路並びにそのマルチパス検出方法
JP2001223671A (ja) * 2000-02-14 2001-08-17 Mitsubishi Electric Corp フェージングピッチ検出装置およびこれを用いた携帯情報端末
JP2001244849A (ja) * 2000-02-29 2001-09-07 Matsushita Electric Ind Co Ltd 通信端末装置及びセルサーチ方法
US6873648B1 (en) * 2000-03-02 2005-03-29 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for fast detection of locations of path rays in a receiver having multiple time references
JP3732707B2 (ja) * 2000-03-16 2006-01-11 富士通株式会社 加入者側通信装置における再同期制御装置および再同期方法
US7224719B1 (en) 2000-03-31 2007-05-29 Qualcomm, Incorporated Fast acquisition of a pilot signal in a wireless communication device
JP3884896B2 (ja) * 2000-04-06 2007-02-21 株式会社エヌ・ティ・ティ・ドコモ 通信品質取得装置および通信品質取得方法
US6925108B1 (en) * 2000-05-26 2005-08-02 Freescale Semiconductor, Inc. Ultrawide bandwidth system and method for fast synchronization
JP2002026768A (ja) * 2000-07-07 2002-01-25 Nec Corp 通信装置
JP3441431B2 (ja) * 2000-11-09 2003-09-02 日本電気株式会社 Rake受信機及び受信方法
JP3428637B2 (ja) * 2000-11-27 2003-07-22 日本電気株式会社 Cdma受信機のマルチパス検出方法および回路
US7995682B2 (en) 2001-05-18 2011-08-09 Broadcom Corporation Method and apparatus for performing signal processing using historical correlation data
US6819707B2 (en) 2001-05-18 2004-11-16 Global Locate, Inc. Method and apparatus for performing signal correlation using historical correlation data
US6891880B2 (en) 2001-05-18 2005-05-10 Global Locate, Inc. Method and apparatus for performing signal correlation
US7006556B2 (en) 2001-05-18 2006-02-28 Global Locate, Inc. Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference
US7190712B2 (en) * 2001-05-18 2007-03-13 Global Locate, Inc Method and apparatus for performing signal correlation
US7769076B2 (en) 2001-05-18 2010-08-03 Broadcom Corporation Method and apparatus for performing frequency synchronization
US7567636B2 (en) * 2001-05-18 2009-07-28 Global Locate, Inc. Method and apparatus for performing signal correlation using historical correlation data
US7065129B2 (en) * 2001-06-29 2006-06-20 Qualcomm, Inc. Acquisition of a gated pilot by avoiding partial correlation peaks
JP3753637B2 (ja) 2001-08-30 2006-03-08 Necマイクロシステム株式会社 Cdma受信装置におけるパス検出方法及びその装置並びに制御プログラムを記録した記録媒体
JP3813490B2 (ja) 2001-10-30 2006-08-23 富士通株式会社 スペクトラム拡散レイク受信機
US7586837B2 (en) * 2001-12-14 2009-09-08 Qualcomm Incorporated Acquisition of a gated pilot signal
JP3726897B2 (ja) * 2002-02-27 2005-12-14 ソニー株式会社 Gps受信機およびgps衛星信号の受信方法
US7050485B2 (en) * 2002-05-07 2006-05-23 Koninklijke Philips Electronics N.V. Iterative CDMA phase and frequency acquisition
WO2004006480A1 (fr) * 2002-07-03 2004-01-15 Linkair Communications,Inc. Procede et appareil de reperage continu de codes d'etalement de spectre en mode cdma
WO2004025861A1 (ja) * 2002-09-13 2004-03-25 Mitsubishi Denki Kabushiki Kaisha Rake受信機
US7161977B1 (en) * 2003-01-28 2007-01-09 Trimble Navigation Limited Receiver having a ratio-based signal acquisition method
US6879813B2 (en) * 2003-01-30 2005-04-12 Interdigital Technology Corporation Link-quality estimation method and components for multi-user wireless communication systems
WO2005076492A1 (ja) * 2004-02-03 2005-08-18 Matsushita Electric Industrial Co., Ltd. Rake受信装置およびrake受信方法
US20050180558A1 (en) * 2004-02-17 2005-08-18 Sarnoff Corporation Method and apparatus for equalizing strong pre-echoes in a multi-path communication channel
DE102007053402A1 (de) * 2007-11-09 2009-05-14 Rohde & Schwarz Gmbh & Co. Kg Synchronisierung von Empfangssymbolen bei OFDM
JP4920609B2 (ja) * 2008-01-24 2012-04-18 シャープ株式会社 無線通信装置
JP5599677B2 (ja) * 2010-08-18 2014-10-01 ラピスセミコンダクタ株式会社 ダイバシティ受信装置及びダイバシティ受信方法
JP5465131B2 (ja) * 2010-08-18 2014-04-09 三菱電機株式会社 符号推定装置および符号推定方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3743732C2 (de) * 1987-12-23 1994-12-01 Ant Nachrichtentech Verfahren zur Synchronisierung eines Codewortes mit einem empfangenen spektral gespreizten Signal
GB2268364B (en) * 1992-06-25 1995-10-11 Roke Manor Research Improvements in or relating to radio communication systems
JP2771757B2 (ja) * 1992-06-29 1998-07-02 三菱電機株式会社 スペクトル拡散通信用受信装置のデータ復調回路
JP2689890B2 (ja) * 1993-12-30 1997-12-10 日本電気株式会社 スペクトラム拡散受信機
JPH07245597A (ja) * 1994-03-02 1995-09-19 Pioneer Electron Corp スペクトラム拡散通信方法及び送受信装置
US5577022A (en) * 1994-11-22 1996-11-19 Qualcomm Incorporated Pilot signal searching technique for a cellular communications system

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KR100199237B1 (ko) 1999-06-15
AU692006B2 (en) 1998-05-28
US5812593A (en) 1998-09-22
EP0718998A3 (en) 1998-03-04
EP0718998A2 (en) 1996-06-26
AU4064195A (en) 1996-06-27
JPH08181636A (ja) 1996-07-12

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