JPH10510966A - Cdmaシステムのためのネットワーク参入チャンネル - Google Patents
Cdmaシステムのためのネットワーク参入チャンネルInfo
- Publication number
- JPH10510966A JPH10510966A JP8519262A JP51926296A JPH10510966A JP H10510966 A JPH10510966 A JP H10510966A JP 8519262 A JP8519262 A JP 8519262A JP 51926296 A JP51926296 A JP 51926296A JP H10510966 A JPH10510966 A JP H10510966A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- time
- station
- nec
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
- H04J13/0048—Walsh
-
- 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
- H04B7/204—Multiple access
- H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0022—PN, e.g. Kronecker
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
- H04J13/12—Generation of orthogonal codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.地上ハブ局が、衛星を経由して、選択された周波数チャンネルで対応する複 数の地上加入者局から複数のスペクトル拡散信号を受信するOCDMA衛星通信 システムであって、加入者局からのそれぞれの信号が一組の直交ラデマッヒャー ・ウオルシュ(RW)関数及び疑似雑音シーケンスによってオーバーレイされて おり、加入者局からの前記信号が時間同期及び周波数同期の状態で前記ハブ局に 到達するように同期が取られているOCDMA衛星通信システムにおいて、 OCDMA信号のスペクトル・ゼロに位置するNEC信号を前記地上ハブ局と 前記加入者局との間で送信するための各加入者局における手段からなる加入者局 ネット参入チャンネル(NEC)を形成するための手段であって、前記NEC信 号が、時間同期されたPN符号によってオーバーレイされており且つ前記RW関 数が存在しないユーザ識別番号と時間オフセット番号とを含んでいる形成手段と 、 各加入者局からの前記NEC信号を検出して復調し、前記各加入者局に周波数 とRW関数を割り当てるための前記地上ハブ局における手段と、 ネット参入の際にほぼ時間同期状態のなるように、それぞれの前記加入者局に 周波数及び時間の補正信号を送信するための手段と、 を具備するOCDMA衛星通信システム。 2.地上ハブ局が選択された周波数チャンネル上で対応する複数の地上加入者局 から複数のスペクトル拡散信号を受信するOCDMA衛星通信システムであって 、加入者局からの各信号が一組の直交ラデマッヒャー・ウオルシュ(RW)関数 と疑似雑音シーケンスとによってオーバーレイされており、加入者からの前記信 号が時間同期及び周波数同期の状態で前記ハブ局に到達するように同期が取られ ているOCDMA衛星通信システムにおいて、 OCDMA信号のスペクトル・ゼロに位置するNEC信号を前記地上ハブ局と 前記加入者局との間で送信するための加入者ステーションを形成する手段であっ て、前記NEC信号が、時間同期されたPN符号によってオーバーレイされてお り且つ前記RW関数が存在しないユーザ識別番号と時間オフセット番号とを含ん でいる手段と、 各加入者局からの前記NEC信号を検出して復調し、前記各加入者局に周波数 とRW関数とを割り当てるための前記地上ハブ局における手段と、 それぞれの前記加入者局に周波数及び時間の補正信号を送信するための送信手 段であって、それぞれの前記加入者局が前記の周波数及び時間の補正信号を受信 するための受信機手段と前記加入者局のそれぞれがネット参入の際にほぼ時間同 期状態になることを保証するための手段とを有する送信手段と、 を具備するOCDMA衛星通信システム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/358,078 US5654955A (en) | 1994-12-15 | 1994-12-15 | Network entry channel for CDMA systems |
US08/358,078 | 1994-12-15 | ||
PCT/US1995/016325 WO1996019050A1 (en) | 1994-12-15 | 1995-12-15 | Network entry channel for cdma systems |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10510966A true JPH10510966A (ja) | 1998-10-20 |
JP3534773B2 JP3534773B2 (ja) | 2004-06-07 |
Family
ID=23408218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51926296A Expired - Lifetime JP3534773B2 (ja) | 1994-12-15 | 1995-12-15 | Cdmaシステムのためのネットワーク参入チャンネル |
Country Status (9)
Country | Link |
---|---|
US (1) | US5654955A (ja) |
EP (1) | EP0806096B1 (ja) |
JP (1) | JP3534773B2 (ja) |
KR (1) | KR100393348B1 (ja) |
AT (1) | ATE262242T1 (ja) |
AU (1) | AU4640696A (ja) |
CA (1) | CA2206796C (ja) |
DE (1) | DE69532723T2 (ja) |
WO (1) | WO1996019050A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003519963A (ja) * | 2000-01-05 | 2003-06-24 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | スペクトラム拡散通信システムにおけるオフセット訂正 |
WO2004086653A1 (ja) * | 2003-03-25 | 2004-10-07 | Mitsubishi Denki Kabushiki Kaisha | ランダムアクセス制御方法、基地局および端末装置 |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA965340B (en) | 1995-06-30 | 1997-01-27 | Interdigital Tech Corp | Code division multiple access (cdma) communication system |
US5995497A (en) * | 1996-04-23 | 1999-11-30 | At&T Corp. | Method and apparatus for switching code division multiple access modulated beams in a satellite |
GB2354413B (en) * | 1996-07-23 | 2001-05-30 | Roke Manor Research | Randomised code acquisition |
US6222828B1 (en) * | 1996-10-30 | 2001-04-24 | Trw, Inc. | Orthogonal code division multiple access waveform format for use in satellite based cellular telecommunications |
US5799000A (en) * | 1997-02-06 | 1998-08-25 | At&T Wireless Services, Inc. | Delay compensation |
US5933421A (en) * | 1997-02-06 | 1999-08-03 | At&T Wireless Services Inc. | Method for frequency division duplex communications |
US6501771B2 (en) | 1997-02-11 | 2002-12-31 | At&T Wireless Services, Inc. | Delay compensation |
US6002664A (en) * | 1997-02-24 | 1999-12-14 | At&T Wireless Services Inc. | Method to gain access to a base station in a discrete multitone spread spectrum communications system |
US6584144B2 (en) * | 1997-02-24 | 2003-06-24 | At&T Wireless Services, Inc. | Vertical adaptive antenna array for a discrete multitone spread spectrum communications system |
US6408016B1 (en) * | 1997-02-24 | 2002-06-18 | At&T Wireless Services, Inc. | Adaptive weight update method and system for a discrete multitone spread spectrum communications system |
US6359923B1 (en) * | 1997-12-18 | 2002-03-19 | At&T Wireless Services, Inc. | Highly bandwidth efficient communications |
JP3535344B2 (ja) * | 1997-05-30 | 2004-06-07 | 松下電器産業株式会社 | マルチキャリア伝送方法及びデータ送信装置並びに移動局装置及び基地局装置 |
US6542481B2 (en) | 1998-06-01 | 2003-04-01 | Tantivy Communications, Inc. | Dynamic bandwidth allocation for multiple access communication using session queues |
US6081536A (en) | 1997-06-20 | 2000-06-27 | Tantivy Communications, Inc. | Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link |
KR100365346B1 (ko) * | 1997-09-09 | 2003-04-11 | 삼성전자 주식회사 | 이동통신시스템의쿼시직교부호생성및쿼시직교부호를이용한대역확산장치및방법 |
US6091703A (en) * | 1997-10-10 | 2000-07-18 | Trw Inc. | Bulk despreading of multiple independent CDMA sources |
US9525923B2 (en) | 1997-12-17 | 2016-12-20 | Intel Corporation | Multi-detection of heartbeat to reduce error probability |
US6222832B1 (en) * | 1998-06-01 | 2001-04-24 | Tantivy Communications, Inc. | Fast Acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system |
US7394791B2 (en) | 1997-12-17 | 2008-07-01 | Interdigital Technology Corporation | Multi-detection of heartbeat to reduce error probability |
US6570844B1 (en) | 1997-12-29 | 2003-05-27 | Alcatel Usa Sourcing, L.P. | System and method for providing redundancy in a telecommunications system |
US6512755B1 (en) | 1997-12-29 | 2003-01-28 | Alcatel Usa Sourcing, L.P. | Wireless telecommunications access system |
JP3214466B2 (ja) * | 1998-04-07 | 2001-10-02 | 日本電気株式会社 | 移動通信システム及びその通信制御方法並びにそれに用いる基地局及び移動局 |
US6396825B1 (en) * | 1998-08-18 | 2002-05-28 | Motorola, Inc. | Method and apparatus for using a pseudo-random signal in a communication system |
US6487235B2 (en) | 1998-08-24 | 2002-11-26 | At&T Wireless Services, Inc. | Delay compensation |
KR100536585B1 (ko) * | 1999-01-06 | 2005-12-14 | 삼성전자주식회사 | 통신 시스템의 오프-셋 보정 회로 |
US7065125B1 (en) * | 1999-08-13 | 2006-06-20 | Viasat, Inc. | Method and apparatus for multiple access over a communication channel |
US20070127553A1 (en) | 1999-08-13 | 2007-06-07 | Viasat, Inc. | Code Reuse Multiple Access For Satellite Return Link |
WO2001058044A2 (en) | 2000-02-07 | 2001-08-09 | Tantivy Communications, Inc. | Minimal maintenance link to support synchronization |
US8155096B1 (en) | 2000-12-01 | 2012-04-10 | Ipr Licensing Inc. | Antenna control system and method |
US7551663B1 (en) | 2001-02-01 | 2009-06-23 | Ipr Licensing, Inc. | Use of correlation combination to achieve channel detection |
US20020145969A1 (en) | 2001-02-28 | 2002-10-10 | Zulfiquar Sayeed | Carrier frequency acquisition method and apparatus having improved reliability for detecting carrier acquisition or loss thereof |
KR100665077B1 (ko) | 2001-06-13 | 2007-01-09 | 탄티비 커뮤니케이션즈 인코포레이티드 | 하트비트 요구보다 낮은 레벨로의 하트비트 신호의 전송 |
US7095710B2 (en) * | 2001-12-21 | 2006-08-22 | Qualcomm | Decoding using walsh space information |
US7289460B1 (en) * | 2002-06-14 | 2007-10-30 | Lockheed Martin Corporation | Satellite communications system |
US20170127323A1 (en) * | 2014-04-27 | 2017-05-04 | Novelsat Ltd. | Handover between satellites using a single modem |
KR102434920B1 (ko) | 2021-10-29 | 2022-08-22 | 주식회사 지아이 | 계단 오르기 |
GB2623556A (en) * | 2022-10-20 | 2024-04-24 | Qinetiq Ltd | Direct sequence spread spectrum coding scheme for a transmitter and receiver |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6033746A (ja) * | 1983-08-04 | 1985-02-21 | Nec Corp | 衛星回線監視方式 |
JPS6248819A (ja) * | 1985-08-28 | 1987-03-03 | Kokusai Denshin Denwa Co Ltd <Kdd> | 衛星通信方式 |
JPH02211732A (ja) * | 1989-02-10 | 1990-08-23 | Clarion Co Ltd | スペクトラム拡散通信方式 |
US5036523A (en) * | 1989-10-03 | 1991-07-30 | Geostar Corporation | Automatic frequency control of satellite transmitted spread spectrum signals |
US5138631A (en) * | 1989-12-21 | 1992-08-11 | Gte Spacenet Corporation | Satellite communication network |
JP2675890B2 (ja) * | 1990-03-06 | 1997-11-12 | キヤノン株式会社 | スペクトラム拡散通信装置 |
US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
FR2681199B1 (fr) * | 1991-09-11 | 1993-12-03 | Agence Spatiale Europeenne | Procede et dispositif pour multiplexer des signaux de donnees. |
DE4210305A1 (de) * | 1992-03-30 | 1993-10-07 | Sel Alcatel Ag | Verfahren, Sender und Empfänger zur Informationsdatenübertragung mit veränderlichem Verkehrsaufkommen und Leitstation zur Koordinierung mehrerer solcher Sender und Empfänger |
JP2720721B2 (ja) * | 1992-08-21 | 1998-03-04 | 日本電気株式会社 | 変復調装置 |
US5345469A (en) * | 1993-02-01 | 1994-09-06 | Motorola, Inc. | Communication device with code sequence selection system |
EP0639899B2 (en) * | 1993-03-05 | 2008-02-27 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
US5359624A (en) * | 1993-06-07 | 1994-10-25 | Motorola, Inc. | System and method for chip timing synchronization in an adaptive direct sequence CDMA communication system |
US5353300A (en) * | 1993-06-07 | 1994-10-04 | Motorola, Inc. | Communication method for an adaptive direct sequence CDMA communication system |
-
1994
- 1994-12-15 US US08/358,078 patent/US5654955A/en not_active Expired - Lifetime
-
1995
- 1995-12-15 CA CA002206796A patent/CA2206796C/en not_active Expired - Fee Related
- 1995-12-15 DE DE69532723T patent/DE69532723T2/de not_active Expired - Lifetime
- 1995-12-15 WO PCT/US1995/016325 patent/WO1996019050A1/en active Search and Examination
- 1995-12-15 KR KR1019970703998A patent/KR100393348B1/ko not_active IP Right Cessation
- 1995-12-15 AT AT95944333T patent/ATE262242T1/de not_active IP Right Cessation
- 1995-12-15 EP EP95944333A patent/EP0806096B1/en not_active Expired - Lifetime
- 1995-12-15 AU AU46406/96A patent/AU4640696A/en not_active Abandoned
- 1995-12-15 JP JP51926296A patent/JP3534773B2/ja not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003519963A (ja) * | 2000-01-05 | 2003-06-24 | アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド | スペクトラム拡散通信システムにおけるオフセット訂正 |
WO2004086653A1 (ja) * | 2003-03-25 | 2004-10-07 | Mitsubishi Denki Kabushiki Kaisha | ランダムアクセス制御方法、基地局および端末装置 |
Also Published As
Publication number | Publication date |
---|---|
CA2206796C (en) | 2001-05-08 |
DE69532723D1 (de) | 2004-04-22 |
WO1996019050A1 (en) | 1996-06-20 |
US5654955A (en) | 1997-08-05 |
EP0806096A4 (en) | 2002-10-23 |
JP3534773B2 (ja) | 2004-06-07 |
AU4640696A (en) | 1996-07-03 |
EP0806096A1 (en) | 1997-11-12 |
ATE262242T1 (de) | 2004-04-15 |
DE69532723T2 (de) | 2005-04-28 |
KR100393348B1 (ko) | 2003-10-17 |
CA2206796A1 (en) | 1996-06-20 |
EP0806096B1 (en) | 2004-03-17 |
KR980700742A (ko) | 1998-03-30 |
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