Method and system for soft decision propagation
    1.
    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。

    System and method for providing dual satellite communications coverage
    2.
    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
    3.
    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)。

    Method and system for synchronous code division multiplexed communications
    4.
    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。

    Methods and apparatus for providing multiple wireless communication services having different bit rates
    5.
    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
    8.
    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 apparatus for controlling communication beams within a cellular communication system
    9.
    发明授权
    Method and apparatus for controlling communication beams within a cellular communication system 有权
    用于控制蜂窝通信系统内的通信波束的方法和装置

    公开(公告)号:US06556809B1

    公开(公告)日:2003-04-29

    申请号:US09447313

    申请日:1999-11-22

    IPC分类号: H04B7185

    CPC分类号: H04B7/18532

    摘要: A beam control subsystem (200, FIG. 2) provides acquisition, synchronization, and traffic beams (142, FIG. 1) to communication devices (130) within a footprint (144) of a system node (110), where each beam comprises a set of beamlets (140). The subsystem (200, FIG. 2) first acquires (302, FIG. 3) and synchronizes (304, FIG. 3 and FIG. 6) with each communication device. Acquisition involves selecting (402, 416, FIG. 4) and combining (404) sets of beamlets (506, 510, FIG. 5), and determining whether any devices within the sets are attempting to acquire the system. If so, synchronization is performed by varying (604, FIG. 6) beamlet weighting coefficients to find, based on modem feedback, a combination of coefficients that yields a maximum signal-to-interference+noise ratio for multiple users within a beam. The communication device is then handed off (612, 614) to a traffic beam. The subsystem (200) continues, based on modem feedback, to adapt (802, 804, FIG. 8) beamlet weighting coefficients in order to track the traffic beam in a manner that provides the maximum SINR.

    摘要翻译: 波束控制子系统(图2中的200)向系统节点(110)的占用空间(144)内的通信设备(130)提供获取,同步和业务波束(142),其中每个波束包括 一组子束(140)。 子系统(200,图2)首先获取(302,图3)并与每个通信设备同步(304,图3和图6)。 获取包括选择(402,416,图4)和组合(404)子束集合(506,510,图5),以及确定集合内的任何设备是否正在尝试获取系统。 如果是这样,则通过改变(604,图6)子波束加权系数来执行同步,以基于调制解调器反馈找到对波束内的多个用户产生最大信号与干扰+噪声比的系数的组合。 然后将通信设备切换到业务波束(612,614)。 子系统(200)基于调制解调器反馈继续适应(802,804,图8)子束加权系数,以便以提供最大SINR的方式跟踪业务量。

    System and method for multi-mode operation of satellite phased-array antenna
    10.
    发明授权
    System and method for multi-mode operation of satellite phased-array antenna 有权
    卫星相控阵天线多模操作系统及方法

    公开(公告)号:US06307507B1

    公开(公告)日:2001-10-23

    申请号:US09519915

    申请日:2000-03-07

    IPC分类号: H01Q326

    摘要: A method and apparatus are provided for operating a phased-array antenna (14) on a satellite-based communications node (10) in more than one mode by controlling the number of beam-forming elements and by applying appropriate phase-control and/or amplitude-control coefficients to the selected elements. The antenna can be operated as a diffused-beam antenna at a relatively low data rate, enabling the satellite-communications node (10) to communicate with a first terrestrial communications node (22). The antenna can also be operated to generate multiple focused-beam antenna patterns each communicating at a relatively high data rate, enabling the satellite-communications node (10) to communicate with a different terrestrial communications node (20) by changing the amplitude and/or the phase coefficients as well as the number of beam-forming elements.

    摘要翻译: 提供了一种方法和装置,用于通过控制波束形成元件的数量并且通过施加适当的相位控制和/或多个方式来以多于一种模式在基于卫星的通信节点(10)上操作相控阵天线(14) 对所选元素的幅度控制系数。 天线可以以相对低的数据速率作为漫射波束天线来操作,使卫星通信节点(10)能够与第一地面通信节点(22)通信。 天线也可以被操作以产生多个以相对高的数据速率通信的聚焦波束天线方向图,使得卫星通信节点(10)可以通过改变振幅和/或波段来与不同的地面通信节点(20)通信 相位系数以及波束形成元件的数量。