CN1172388A - 分组化码分多址/时分多路卫星通信系统 - Google Patents
分组化码分多址/时分多路卫星通信系统 Download PDFInfo
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- CN1172388A CN1172388A CN97114716A CN97114716A CN1172388A CN 1172388 A CN1172388 A CN 1172388A CN 97114716 A CN97114716 A CN 97114716A CN 97114716 A CN97114716 A CN 97114716A CN 1172388 A CN1172388 A CN 1172388A
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- 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
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
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- 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
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- 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
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18582—Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
- H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
- H04L2012/5608—Satellite
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
- Time-Division Multiplex Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
在一个卫星通信系统中,一个包括用户数据的码分多址上行线路信号以分组化的方式传输,这些分组在往下行线路发送之前先由卫星上的分组交换器交换。分组交换器根据包含在分组头中的址信息为分组从几个输出下行线路无线电波束中选择合适的一个作为路由。时分多路通信用于下行线路传输。本发明构成一个高效率的多用户卫星通信系统。
Description
本发明涉及卫星通信系统,尤其涉及这样一种系统,它使用分组化码分多址上行线路、星上分组交换和时分多路通信下行线路传输的联合体。
使用卫星连接的通信接续方案通常使用频分多址和时分多址处理技术实现。通常卫星利用弓形管道(Bent Pipe)技术将上行线路信号发射到目的地,弓形管道技术是指卫星仅作为转播器,而不执行任何星上交换或多路通信功能。因此,所有交换和相关控制必须在地面的发射和接收终端站执行。这限制了系统的灵活性,因为系统的智能(intelligence)集中在地面终端站上。在卫星应用中也使用码分多址,但是先前没有星载处理,阻碍了混合系统的发明。混合系统对于上行线路和下行线路使用不同种类的空中接口(air interface)。
事实上,如语音/多媒体系统中的通信可能是突发性的,这一情况不利于时分多址和频分多址传输模式。使用时分多址和频分多址传输模式在许多应用中是不能满足的,因为时隙和/或信道的分配需要一个无法接受的准备时间。另外,改变时隙/频率的分配以满足瞬间需要是一个复杂的过程,将导致复杂的系统控制。
根据本发明,一个卫星通信系统提供了一种独特的联合体,这种联合体包括地面到空中接口的码分多址、星上分组式传输及交换(如异步传输模式ATM)和下行线路传输的时分多路通信,就象在权利要求书中列出的那样。
在突发通信系统中,分组交换具有明显的优势,因为它在接收信号时是异步的,很容易适合信号到达的变化。分组式码分多址是使用无线信道在不同地点传输突发通信的一种有效方法。
码分多址系统的容量极大地依赖于其他用户引起的干扰。如果通信是突发的并且仅当有信息需要传输时才发送分组,那么给其他用户带来的干扰就会减小,而且系统所能支持的用户数就会增长。它还具有这样的好处:除电路初始准备外,不需要额外的信令或准备时间来为用户实现数据突发和/或数据率变化,因此提供了符合容量要求的带宽。
在码分多址系统中,需要为传输信息的各个用户分别分配扩展码。事实上,在典型实现中可利用的扩展码极大地超过了承载特定数目同时信道的空中接口容量。使用码分多址有利于允许当系统利用过度增长时超出容量的有效信道的质量适度降低。
在一个卫星系统的设计中,最大的限制之一就是能从卫星上获得的功率。多载波系统如码分多址需要使用低效率操作使得避免相互调制失真,导致这些系统的功率利用率很低。通过在下行线路中使用时分多路通,信系统的功率利用效率变的更高同时又能保持码分多址的多址联接的优点。
本发明的一个特定实施方式:在码分多址上行线路信号中的ATM分组(包括用户数据)在卫星上被卫星所带的ATM交换器处理和交换,然后才往下行线路发送。ATM交换器根据包含在分组头中的地址信息为ATM分组在几个输出的下行线路无线电波束中选择一个合适的路由。下行线路信号通过时分多路通信处理来传输。注意,下行线路亦可以使用频分多路通信或码分多路通信。本发明具有的优点是突发数据的数据率改变之前网络不需要额外的准备时间。
图1是卫星通信系统的简图;
图2是上行线路、卫星的解调和交换电路以及卫星的下行线路处理电路的一个实施方式的方框图。
在图1中用图示法显示了一个示例性的连接发射用户地球站和接收用户地球站的示例性的卫星通信系统。卫星具有多个无线电点波束(spot-beam)用于发射和接收。在任何无线电波束中的任何用户都能与同一无线电波束或不同无线电波束的任何其他用户通信。
尽管分别示例性地描述了单独的发射站和接收站101和102,但这些站点可以同时是一个通信系统的发射点和接收点。这些站点可以是空间/地理固定的,也可以是移动的,虽然在这一特定的实施方式中它们在通信时示为在地球的固定点上。另外,站点可以是双向的收发站。为了简单仅显示为单向的。
站101-1包括一个卫星抛物面天线103,该天线发射一个分组化的射频码分多址信号到卫星105。一旦卫星105和地球站101-1间的连接(包括代码同步)建立起来,当有分组信息需要传输或需要发送一个分组以维持同步时,地球站101-1上的发射机将仅发射射频信号。地球站102-1通过自身带有的卫星抛物面天线104从卫星105处接收到包含分组化信息的时分多路通信射频信号。每个无线电波束包括了多个频带。如图所示卫星从其它发射站101-N处接收射频码分多址无线电波束信号,并发射射频时分多路通信信号到多个接收站102-M。这里的上行线路代表了一个同步码分多址系统,该系统中,为了减小干扰,所有用户的信号到达卫星时都是码片(chip)同步的。
卫星收发机接收设备在接收放大器201-1到201-N处接收多个码分多址无线电点波束。经体下变频器(bulk down-converter)201-1到202-N处理后,接收的信号被送到其后接一个多信道码分多址解调器203-1的体下变频器,解调器将码分多址信号进行采样、分离和解调。这些信号被加工为I和Q两部分并且采用离散时间(数字)技术进行解扩。每个码分多址信道包括具有不同数据率的多相相移键控(M-PSK)信号的混合。从所有无线电波束接收的信号都加到ATM交换器250。
ATM交换器250的输出(即下行线路)传输,以时分多路通信格式加到时分多路通信调制器301-1到301-M,这些调制器包括帧形成和前向纠错电路。信号经方框302-1到302-M上变频后,在组件303-1到303-M用行波管放大器或固态功率放大器放大,将每个信道加到同一组件中的输出带通滤波器以抑制谐波。这些输出在节点304-1处被组合成下行线路传输的无线电波束。
Claims (6)
1.用于高效率的多用户卫星通信的信号处理方法,包含如下步骤:
发送来自地球站的上行线路分组化码分多址无线电波束到一个卫星,其中上行线路无线电波束包括多个分组化的信号,它们来自不同的地球站并且具有不同的目的地;
建立代码同步并在任何时间以分组形式发射信息,信息以信道最大数据率来发射,并且在没有信息发送的情况下只发射最少量的数据来实现代码同步。
2.如权利要求1提出的信号处理方法,包括步骤:
在卫星中将所有输入分组组合为无线电波束并且执行分组交换和ATM路由选择,使得具有相同目的地的无线电波束的所有分组组合在一起成为下行线路无线电波束。
3.如权利要求2提出的信号处理方法,包括步骤:
创建一个混合的码分多址-时分多路通信空中接口,其中码分多址信号用于上行线路而时分多路通信信号用于下行线路,因此,码分多址无线电波束提供了一个用于上行线路的有效和灵活的接续方法,同时时分多路通信下行线路无线电波束提供了从卫星到地球站传输的功率的利用效率。
4.用于卫星通信的信号处理方法,包含如下步骤:
以码分多址分组格式发送一个上行线路无线电波束到一个卫星,其中上行线路无线电波束包括多个具有不同的目的地的分组信号;
在卫星的ATM路由器中为这些分组信号选择路由,并将它们组合成无线电波束,使得具有同一目的地无线电波束的所有分组组合在一起。
5.如权利要求4提出的用于卫星通信的信号处理方法,包含如下步骤:为上行线路无线电波束建立代码同步。
6.如权利要求5提出的用于卫星通信的信号处理方法,包含如下步骤:
将所有下行线路分组组合到与这些分组有共同目的地的无线电波束中。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68333996A | 1996-07-18 | 1996-07-18 | |
US683339 | 1996-07-18 |
Publications (1)
Publication Number | Publication Date |
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CN1172388A true CN1172388A (zh) | 1998-02-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN97114716A Pending CN1172388A (zh) | 1996-07-18 | 1997-07-17 | 分组化码分多址/时分多路卫星通信系统 |
Country Status (9)
Country | Link |
---|---|
US (1) | US5875181A (zh) |
EP (1) | EP0820208A3 (zh) |
JP (1) | JPH1079721A (zh) |
KR (1) | KR100299208B1 (zh) |
CN (1) | CN1172388A (zh) |
AU (1) | AU2866797A (zh) |
BR (1) | BR9703556A (zh) |
CA (1) | CA2202116C (zh) |
SG (1) | SG64999A1 (zh) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6181683B1 (en) * | 1995-06-14 | 2001-01-30 | International Business Machines Corp. | Packet data transmission in code-division multiple access communication systems |
GB9709285D0 (en) * | 1997-05-08 | 1997-06-25 | Philips Electronics Nv | Flexible two-way telecommunications system |
US6032041A (en) * | 1997-06-02 | 2000-02-29 | Hughes Electronics Corporation | Method and system for providing wideband communications to mobile users in a satellite-based network |
US6708029B2 (en) * | 1997-06-02 | 2004-03-16 | Hughes Electronics Corporation | Broadband communication system for mobile users in a satellite-based network |
US6657978B1 (en) * | 1998-04-23 | 2003-12-02 | Transworld Communications (Usa), Inc. | Optimized integrated high capacity digital satellite trunking network |
US6310893B1 (en) * | 1998-06-17 | 2001-10-30 | Genuity Inc. | Method and system for connectionless communication in a cell relay satellite network |
US6430167B1 (en) * | 1998-08-03 | 2002-08-06 | Trw Inc. | Method for transferring data over a satellite network by using unique beam identifiers to route the data |
US6243560B1 (en) * | 1998-10-30 | 2001-06-05 | Trw Inc. | Latency reduction in satellite communication systems |
US6980531B1 (en) | 1998-12-02 | 2005-12-27 | At&T Corp. | Multiple access spread spectrum switching methodology |
US6574794B1 (en) * | 1998-12-18 | 2003-06-03 | Hughes Electronics Corporation | System and satellite payload architecture for interactive data distribution services |
US6738346B1 (en) * | 1999-03-16 | 2004-05-18 | Northrop Grumman Corporation | Hierarchical downlink scheduler for a processed satellite payload |
US8005077B1 (en) * | 1999-09-08 | 2011-08-23 | Qwest Communications International Inc. | Distributively routed VDSL and high-speed information packets |
US6466569B1 (en) * | 1999-09-29 | 2002-10-15 | Trw Inc. | Uplink transmission and reception techniques for a processing satelliteation satellite |
US6512749B1 (en) * | 1999-09-29 | 2003-01-28 | Trw Inc. | Downlink transmission and reception techniques for a processing communication satellite |
US7245933B1 (en) * | 2000-03-01 | 2007-07-17 | Motorola, Inc. | Method and apparatus for multicasting in a wireless communication system |
US7113493B1 (en) * | 2000-06-02 | 2006-09-26 | General Electric Company | Active networking in communication satellites |
US6944140B1 (en) * | 2000-06-21 | 2005-09-13 | Northrop Grumman Corporation | Beam hopping self addressed packet switched communication system with multiple beam array antenna |
EP1168669A3 (en) * | 2000-06-21 | 2004-01-28 | Northrop Grumman Corporation | Beam hopping self addressed packet switched communication system with multi-port shared memory |
DE10046240A1 (de) * | 2000-09-19 | 2002-03-28 | Deutsche Telekom Ag | Verfahren zur Messung der unidirektionalen Übertragungseigenschaften, wie Paketlaufzeit, Laufzeitschwankungen und der hieraus ableitbaren Ergebnisse, in einem Telekommunikationsnetz |
US6954440B2 (en) * | 2000-12-20 | 2005-10-11 | At&T Corp. | Method and apparatus for code division switching |
US8326217B2 (en) * | 2006-01-18 | 2012-12-04 | Overhorizon (Cyprus) Plc | Systems and methods for satellite communications with mobile terrestrial terminals |
US8713324B2 (en) | 2006-01-18 | 2014-04-29 | Overhorizon (Cyprus) Plc | Systems and methods for tracking mobile terrestrial terminals for satellite communications |
US8078141B2 (en) | 2006-01-18 | 2011-12-13 | Overhorizon (Cyprus) Plc | Systems and methods for collecting and processing satellite communications network usage information |
US7970534B2 (en) | 2006-08-24 | 2011-06-28 | Blackbird Technologies, Inc. | Mobile unit and system having integrated mapping, communications and tracking |
US7843335B2 (en) * | 2007-03-13 | 2010-11-30 | Blackbird Technologies, Inc. | Mobile asset tracking unit, system and method |
US20110058515A1 (en) * | 2009-09-09 | 2011-03-10 | Frysco, Inc. | Data and telephony satellite network with multiple paths |
US8538373B2 (en) | 2011-05-25 | 2013-09-17 | Blackbird Technologies, Inc. | Methods and apparatus for emergency tracking |
US11973574B1 (en) * | 2017-06-08 | 2024-04-30 | David Hershberg | Systems and methods for private communications networks |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4425639A (en) * | 1981-01-12 | 1984-01-10 | Bell Telephone Laboratories, Incorporated | Satellite communications system with frequency channelized beams |
US4491947A (en) * | 1983-05-31 | 1985-01-01 | At&T Bell Laboratories | Technique for dynamic scheduling of integrated circuit- and packet-switching in a multi-beam SS/TDMA system |
US5084900A (en) * | 1989-12-21 | 1992-01-28 | Gte Spacenet Corporation | Spread spectrum system with random code retransmission |
US5138631A (en) * | 1989-12-21 | 1992-08-11 | Gte Spacenet Corporation | Satellite communication network |
AU636190B2 (en) * | 1991-01-21 | 1993-04-22 | Nec Corporation | Spread packet communication system |
JPH0746248A (ja) * | 1993-07-30 | 1995-02-14 | Toshiba Corp | 無線通信システム |
US5539730A (en) * | 1994-01-11 | 1996-07-23 | Ericsson Ge Mobile Communications Inc. | TDMA/FDMA/CDMA hybrid radio access methods |
US5566164A (en) * | 1994-12-19 | 1996-10-15 | Stanford Telecommunications, Inc. | Practical means for digital generation and combination of a multiplicity of CDMA/FDMA signals |
-
1997
- 1997-04-08 CA CA002202116A patent/CA2202116C/en not_active Expired - Fee Related
- 1997-06-13 BR BR9703556A patent/BR9703556A/pt active Search and Examination
- 1997-07-15 AU AU28667/97A patent/AU2866797A/en not_active Abandoned
- 1997-07-15 EP EP97112052A patent/EP0820208A3/en not_active Withdrawn
- 1997-07-17 CN CN97114716A patent/CN1172388A/zh active Pending
- 1997-07-18 SG SG1997002503A patent/SG64999A1/en unknown
- 1997-07-18 JP JP19297097A patent/JPH1079721A/ja not_active Abandoned
- 1997-07-22 KR KR1019970034236A patent/KR100299208B1/ko not_active IP Right Cessation
- 1997-11-12 US US08/968,186 patent/US5875181A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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SG64999A1 (en) | 1999-05-25 |
JPH1079721A (ja) | 1998-03-24 |
KR980013155A (ko) | 1998-04-30 |
EP0820208A3 (en) | 2000-09-13 |
CA2202116C (en) | 2000-08-01 |
KR100299208B1 (ko) | 2001-10-26 |
CA2202116A1 (en) | 1998-01-18 |
AU2866797A (en) | 1998-01-29 |
EP0820208A2 (en) | 1998-01-21 |
BR9703556A (pt) | 1998-11-10 |
US5875181A (en) | 1999-02-23 |
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