System and method for providing dual satellite communications coverage
    1.
    发明授权
    System and method for providing dual satellite communications coverage 有权
    提供双重卫星通信覆盖的系统和方法

    公开(公告)号:US06411609B1

    公开(公告)日:2002-06-25

    申请号:US09436572

    申请日:1999-11-09

    IPC分类号: H04B7212

    CPC分类号: H04B7/18563 H04B7/212

    摘要: A satellite communication system uses dual satellite coverage techniques to simulate the provision of full duplex communications in the system. Each subscriber (100) in the system communicates with two satellites (102, 104) that use complementary time division duplex (TDD) frame structures (50, 72) for communicating with the subscriber (100). In one embodiment, each satellite in the system performs a transition between a first TDD frame structure (50) and a second TDD frame structure (72) while travelling through a transition region (102) of an associated orbit (130). Preferably, the transition is performed gradually so that an abrupt reduction in system capacity is avoided. In another embodiment, individual orbital planes in the satellite system are dedicated for use with particular TDD frame structures. A subscriber thus communicates with one satellite in each of two planes during a connection.

    摘要翻译: 卫星通信系统使用双卫星覆盖技术来模拟系统中全双工通信的提供。 系统中的每个用户(100)与使用互补时分双工(TDD)帧结构(50,72)进行通信的两个卫星(102,104)通信。 在一个实施例中,系统中的每个卫星在穿过相关轨道(130)的过渡区域(102)的同时,在第一TDD帧结构(50)和第二TDD帧结构(72)之间进行转换。 优选地,逐渐进行转换,以避免系统容量的突然降低。 在另一个实施例中,卫星系统中的各个轨道平面专用于特定的TDD帧结构。 因此,用户在连接期间与两个平面中的每一个中的一个卫星通信。

    Satellite-based communications system with terrestrial repeater and method therefor
    2.
    发明授权
    Satellite-based communications system with terrestrial repeater and method therefor 有权
    基于卫星的陆地中继器通信系统及其方法

    公开(公告)号:US06570858B1

    公开(公告)日:2003-05-27

    申请号:US09431641

    申请日:1999-11-01

    IPC分类号: H04B7212

    CPC分类号: H04B7/18536 H04B7/18534

    摘要: A satellite-based communications system (20) includes a communication satellite (22) using a Time Division Duplex (TDD) frame structure. The communication satellite (22) transmits first data (63) during a first sub-frame (150) and receives second data (65) during a second sub-frame (152) of a time division multiple access (TDMA) frame (144). A terrestrial repeater (30) receives the first data (63) using a first link (36) during the first sub-frame (150), delays the first data (63) by a sub-frame duration, and transmits the first data (63) to a subscriber unit (32) using a second link (42). The terrestrial repeater (30) receives the second data (65) from the subscriber unit (32) using the second link (42), delays the second data (65) by the sub-frame duration, and transmits the second data (65) using the first link (36) to the satellite (22) during the second sub-frame (152).

    摘要翻译: 基于卫星的通信系统(20)包括使用时分双工(TDD)帧结构的通信卫星(22)。 通信卫星(22)在第一子帧(150)期间发送第一数据(63),并且在时分多址(TDMA)帧(144)的第二子帧(152)期间接收第二数据(65) 。 地面中继器(30)在第一子帧(150)期间使用第一链路(36)接收第一数据(63),将第一数据(63)延迟子帧持续时间,并将第一数据 63)使用第二链路(42)发送到订户单元(32)。 地面中继器(30)使用第二链路(42)从用户单元(32)接收第二数据(65),将第二数据(65)延迟子帧持续时间,并且发送第二数据(65) 在第二子帧(152)期间使用卫星(22)的第一链路(36)。

    Subscriber unit for beam acquisition in a satellite communication system and method therefor
    3.
    发明授权
    Subscriber unit for beam acquisition in a satellite communication system and method therefor 有权
    用于卫星通信系统中波束采集的用户单元及其方法

    公开(公告)号:US06272314B1

    公开(公告)日:2001-08-07

    申请号:US09302331

    申请日:1999-04-30

    IPC分类号: H04Q720

    CPC分类号: H04B7/18539

    摘要: In a communications system, an earth-based subscriber unit (40, FIG. 1) receives at least one communications beam (50, 60, FIG. 1) transmitted from one or more moving satellite communications nodes (10, 20). The earthbased subscriber unit evaluates which communications beam should be selected based on the power received (FIG. 2, 210), Doppler frequency shift (270), link quality, (290), interference level (300), and satellite and network specific parameters (310). By considering these factors, the earth-based subscriber unit selects the communications beam (50, 60) that will provide the optimum service and reduce the likelihood that an inter-satellite hand over of the call will be required while the call is in progress.

    摘要翻译: 在通信系统中,地球用户单元(图1中的40)接收从一个或多个移动卫星通信节点(10,20)发送的至少一个通信波束(50,60,图1)。 基于地面的用户单元基于所接收的功率(图2,210),多普勒频移(270),链路质量(290),干扰电平(300)以及卫星和网络特定参数来评估应该选择哪个通信波束 (310)。 通过考虑这些因素,基于地面的用户单元选择将提供最佳服务的通信波束(50,60),并减少在呼叫进行期间将需要进行通话的卫星间切换的可能性。

    Methods and apparatus for providing multiple wireless communication services having different bit rates
    4.
    发明授权
    Methods and apparatus for providing multiple wireless communication services having different bit rates 有权
    用于提供具有不同比特率的多个无线通信服务的方法和装置

    公开(公告)号:US06847622B1

    公开(公告)日:2005-01-25

    申请号:US09713457

    申请日:2000-11-15

    IPC分类号: H04B7/26 H04B7/216

    CPC分类号: H04B7/264

    摘要: A communication system provides multiple wireless services, each potentially having a different information bit rate. A transmitter (400, FIG. 4) encodes (504, FIG. 5) relatively low rate data (430, FIG. 4) using code division multiple access (CDMA). The resulting spread data stream(s) (436, FIG. 4) are multiplexed and modulated (506, 508, FIG. 5) along with relatively high information rate, non-encoded data streams (440, FIG. 4) using a time division multiple access/frequency division multiple access (TDMA/FDMA) protocol. In other embodiments, the methods and apparatus of the present invention can be used in a CDMA only system, or in a system using a time division multiplexing/FDMA and time division multiplexing/CDMA. In one embodiment, the spread data streams are transmitted in timeslots (211-214, FIG. 2) and frequencies (201-204, FIG. 2) that are interspersed between timeslots and frequencies used for the high rate data. A receiver (600, FIG. 6) performs complementary demodulation (704, FIG. 7), demultiplexing (706, FIG. 7), and decoding (710, FIG. 7).

    摘要翻译: 通信系统提供多个无线服务,每个可能具有不同的信息比特率。 发射机(图4中的400)使用码分多址(CDMA)对(504,图5))相对较低的速率数据(图4的430)进行编码。 所产生的扩展数据流(436,图4)与相对高的信息速率,未编码的数据流(图4中的440)被使用时间进行复用和调制(图5的506,508) 分频多址/频分多址(TDMA / FDMA)协议。 在其他实施例中,本发明的方法和装置可以用在仅CDMA系统中,或者在使用时分复用/ FDMA和时分多路复用/ CDMA的系统中。 在一个实施例中,在用于高速率数据的时隙和频率之间散布的时隙(211-214,图2)和频率(201-204,图2)中发送扩展数据流。 接收机(图6中的600)执行互补解调(704,图7),解复用(706,图7)和解码(710,图7)。

    Call management in a TDMA system through variable packet formatting
    7.
    发明授权
    Call management in a TDMA system through variable packet formatting 有权
    通过可变数据包格式化在TDMA系统中的呼叫管理

    公开(公告)号:US06553021B1

    公开(公告)日:2003-04-22

    申请号:US09437672

    申请日:1999-11-10

    IPC分类号: H04B7212

    CPC分类号: H04W28/18 H04B7/18539

    摘要: A time division multiple access (TDMA) communications system (20) includes a first TDMA platform (22) for transmitting a call (32) over a circuit switched communication link (36) to a second TDMA platform (24). The call (32) exhibits a first signal type (84) and second signal type (86). A controller (42) establishes a capacity allocation (200) responsive to the first signal type (84) for the communication link (36). When the call (32) exhibits the first signal type (84), the first TDMA platform (22) transmits first packets (111) of the call (32) in a first packet format (113) using the capacity allocation (200), and when the call (32) exhibits the second signal type (86), the first TDMA platform (22) transmits second packets (140) of the call (32) in a second packet format (139) using the capacity allocation (200).

    摘要翻译: 时分多址(TDMA)通信系统(20)包括用于通过电路交换通信链路(36)向第二TDMA平台(24)发送呼叫(32)的第一TDMA平台(22)。 呼叫(32)表现出第一信号类型(84)和第二信号类型(86)。 响应于通信链路(36)的第一信号类型(84),控制器(42)建立容量分配(200)。 当呼叫(32)呈现第一信号类型(84)时,第一TDMA平台(22)使用容量分配(200)以第一分组格式(113)发送呼叫(32)的第一分组(111) 并且当呼叫(32)呈现第二信号类型(86)时,第一TDMA平台(22)使用容量分配(200)以第二分组格式(139)发送呼叫(32)的第二分组(140) 。

    Method and system for soft decision propagation
    8.
    发明授权
    Method and system for soft decision propagation 有权
    软决策传播的方法和系统

    公开(公告)号:US06343210B1

    公开(公告)日:2002-01-29

    申请号:US09274023

    申请日:1999-03-22

    IPC分类号: H04B1700

    摘要: A method and apparatus for soft decision propagation trades off system bandwidth in return for link margin. When signal quality on an uplink is low, a satellite (20) sends soft decision data, rather than hard decision data, to a gateway (40). When path diversity exists on the uplinks, and multiple satellites (20) receive the uplink, multiple versions of soft decision data are sent to the gateway (40). The gateway combines the soft decision data resulting from multiple uplink paths, thereby increasing the effective uplink signal to noise ratio.

    摘要翻译: 用于软决策传播的方法和装置以系统带宽为交换余量。 当上行链路的信号质量低时,卫星(20)向网关(40)发送软判决数据而不是硬判决数据。 当在上行链路上存在路径分集时,并且多个卫星(20)接收上行链路时,多个版本的软判决数据被发送到网关(40)。 网关组合了多个上行链路路径产生的软决策数据,从而增加了有效的上行链路信噪比。

    Method and system for synchronous code division multiplexed communications
    9.
    发明授权
    Method and system for synchronous code division multiplexed communications 失效
    同步码分多路复用通信方法与系统

    公开(公告)号:US06215780B1

    公开(公告)日:2001-04-10

    申请号:US09116910

    申请日:1998-07-17

    IPC分类号: H04J1300

    摘要: In a code division multiplexed system, a subscriber unit (260, FIG. 1), which includes a pseudonoise code generator (70), is synchronized with the pseudonoise code generator (220) of a communications node (200). Synchronization between the pseudonoise code generators (70, 220) is achieved through measuring the time delay of a signal transmitted from the communications node (200) to the subscriber unit (260) and advancing the code generator of the subscriber unit in accordance with the time delay. This permits transmissions from the subscriber unit (260) to be received synchronously at the satellite. The synchronization is maintained through the periodic transmission from the communications node (200) to the subscriber unit (260) of a message which commands the subscriber unit (260) to adjust the timing of its pseudonoise code generator. The resulting synchronous code division multiplexed system offers increased capacity over conventional systems.

    摘要翻译: 在码分复用系统中,包括伪噪声码产生器(70)的用户单元(260,图1)与通信节点(200)的伪噪声码产生器(220)同步。 通过测量从通信节点(200)发送到用户单元(260)的信号的时间延迟并根据时间推进用户单元的代码生成器来实现伪噪声码发生器(70,220)之间的同步 延迟。 这允许来自用户单元(260)的传输在卫星处被同步接收。 通过从通信节点(200)到用户单元(260)的定期传输来维持同步,消息命令用户单元(260)调整其伪噪声码发生器的定时。 所产生的同步码分多路复用系统提供比常规系统更大的容量。

    Communications system load control methods and apparatus
    10.
    发明授权
    Communications system load control methods and apparatus 有权
    通信系统负载控制方法和装置

    公开(公告)号:US07054641B1

    公开(公告)日:2006-05-30

    申请号:US10070845

    申请日:2000-06-26

    IPC分类号: H04Q7/20 H04Q7/36

    CPC分类号: H04B7/18506

    摘要: A communication system (100) includes an aircraft (120) that acts as a repeater between ground equipment (101) and communication units (128) on the ground. The ground equipment (101) includes multiple base transceiver stations (104, 106, 108) that provide traffic channels, control channels, and access channels. The channels are all in a single beam (124) projected from aircraft (120). Relative loading on access channels is influenced by access class lists (200, FIG. 2) assigned to control channels. Access classes can be transferred from one list to another, or they can be removed from a list. Relative loading of traffic channels on the base transceiver stations is influenced by assigning different time offsets to base transceiver station so that calls can be transferred from one base transceiver station to another.

    摘要翻译: 通信系统(100)包括作为地面设备(101)和地面上的通信单元(128)之间的转发器的飞行器(120)。 地面设备(101)包括提供业务信道,控制信道和接入信道的多个基站收发台(104,106,108)。 这些通道都是从飞机(120)投射的单个梁(124)。 接入信道上的相对负载受到分配给控制信道的接入等级列表(200,图2)的影响。 访问类可以从一个列表传输到另一个列表,也可以从列表中删除。 通过为基站收发台分配不同的时间偏移量,可以对基站收发台上的业务信道的相对负载进行影响,从而可以将呼叫从一个基站收发台传输到另一个基站。