Signal acquistion method and apparatus
    1.
    发明授权
    Signal acquistion method and apparatus 有权
    信号采集方法和装置

    公开(公告)号:US06366775B1

    公开(公告)日:2002-04-02

    申请号:US09263551

    申请日:1999-03-08

    IPC分类号: H04Q720

    CPC分类号: H04B7/18558 H04B7/2125

    摘要: A method and apparatus for acquiring satellite signals and subscriber unit signals utilizes broadcast beams (205) and acquisition beams (215) projected from a satellite (20). The broadcast beams (205) and acquisition beams (215) form broadcast acquisition beam pairs that are swept within the footprint (50) of the satellite (20) on the surface of the earth. Broadcast bursts are transmitted by the satellite (20) in the broadcast beams (205), and acquisition bursts broadcast by subscriber units (30) are received by the satellite (20) in acquisition beams (215).

    摘要翻译: 用于获取卫星信号和用户单元信号的方法和装置利用从卫星(20)投影的广播波束(205)和采集波束(215)。 广播波束(205)和采集波束(215)形成在地球表面上的卫星(20)的占地面积(50)内扫描的广播获取波束对。 广播突发由卫星(20)在广播波束(205)中发射,由用户单元(30)广播的采集脉冲串由卫星(20)在采集波束(215)中接收。

    Systems and method for use in a dual mode satellite communications system
    2.
    发明授权
    Systems and method for use in a dual mode satellite communications system 有权
    用于双模式卫星通信系统的系统和方法

    公开(公告)号:US06198730B1

    公开(公告)日:2001-03-06

    申请号:US09170257

    申请日:1998-10-13

    IPC分类号: H04B7212

    摘要: A communications network is capable of using time division multiple access (TDMA) techniques, code division multiple access (CDMA) techniques, or a combination of both. A subscriber unit (30) makes a request for a traffic channel over a CDMA pilot channel or a TDMA broadcast channel. A satellite (20) or a base station (40) receives the request and determines whether to assign a TDMA or CDMA traffic channel. The downlink and uplink can have the same access scheme (e.g., TDMA) or different access schemes (e.g., TDMA on the uplink and CDMA on the downlink).

    摘要翻译: 通信网络能够使用时分多址(TDMA)技术,码分多址(CDMA)技术或两者的组合。 用户单元(30)通过CDMA导频信道或TDMA广播信道对业务信道进行请求。 卫星(20)或基站(40)接收该请求并确定是否分配TDMA或CDMA业务信道。 下行链路和上行链路可以具有相同的接入方案(例如,TDMA)或不同的接入方案(例如,上行链路上的TDMA和下行链路上的CDMA)。

    Method and apparatus for providing deterministic hand-offs in a cellular
communication system
    3.
    发明授权
    Method and apparatus for providing deterministic hand-offs in a cellular communication system 失效
    在蜂窝通信系统中提供确定性切换的方法和装置

    公开(公告)号:US6138021A

    公开(公告)日:2000-10-24

    申请号:US963211

    申请日:1997-11-03

    IPC分类号: G01S19/14 H04B7/185 H04Q7/20

    摘要: In cellular communication systems, hand-offs are performed to maintain links as subscriber units (110) and cells (420, 450) move relative to each other. The hand-off process is improved by using a pre-stored time-based cell map (400) and precise geo-location data. This information is used to set a hand-off timer for deterministically initiating the hand-off process in the current cell (500). The timer diminishes the amount of power monitoring which is required in the hand-off initiation process. This capability is especially important in satellite communication systems with fast moving cells and sharp boundaries.

    摘要翻译: 在蜂窝通信系统中,执行切换以维持作为用户单元(110)的链路,并且小区(420,450)相对于彼此移动。 通过使用预先存储的基于时间的小区图(400)和精确的地理位置数据来改进越区切换过程。 该信息用于设置用于确定性地启动当前小区(500)中的切换过程的切换定时器。 定时器减少切换启动过程中所需的功率监控量。 这种能力在具有快速移动小区和尖锐边界的卫星通信系统中尤为重要。

    Method and apparatus for controlling link quality in a wireless
communication system
    4.
    发明授权
    Method and apparatus for controlling link quality in a wireless communication system 失效
    用于控制无线通信系统中的链路质量的方法和装置

    公开(公告)号:US5918176A

    公开(公告)日:1999-06-29

    申请号:US652219

    申请日:1996-05-23

    摘要: A control facility (130) within a wireless communication system receives, from a communication unit (120) (CU), a power measurement (306) of a signal (150) projected by a transceiver node (102). The power measurement (306) can be associated with location information (304) for the CU (120) and a time stamp (302). The control facility (130) uses this information to determine whether the CU (120) is being provided with a signal (150) having an acceptable link margin. If not, the control facility mitigates (408, 508, 512, 514, 518, 520) the effects of the unacceptable link margin, if possible. When power measurements (306) are received from multiple CUs (120), the control facility (130) can use the measurements (306) to create (402, 502) a link margin map which correlates CU location (304) with power measurements (306). The map is used to analyze the link margins within the system.

    摘要翻译: 无线通信系统内的控制设备(130)从通信单元(CU)接收由收发器节点(102)投影的信号(150)的功率测量(306)。 功率测量(306)可以与CU(120)的位置信息(304)和时间戳(302)相关联。 控制设备(130)使用该信息来确定CU(120)是否被提供有具有可接受的链接余量的信号(150)。 如果不是,如果可能,控制设施减轻(408,508,512,514,518,520)不可接受的链路余量的影响。 当从多个CU(120)接收到功率测量(306)时,控制设备(130)可以使用测量(306)创建(402,502)链接边界图,其将CU位置(304)与功率测量( 306)。 该地图用于分析系统内的链接边距。

    Method and system for synchronous code division multiplexed communications
    5.
    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。

    Method and apparatus for real-time channel resource allocation in a
communications system
    6.
    发明授权
    Method and apparatus for real-time channel resource allocation in a communications system 有权
    通信系统中实时信道资源分配的方法和装置

    公开(公告)号:US6157840A

    公开(公告)日:2000-12-05

    申请号:US144817

    申请日:1998-08-31

    IPC分类号: H04B7/185 H04G7/20

    CPC分类号: H04B7/18539

    摘要: A satellite (110 FIG. 1) is used to make channel allocations for SUs (120) in communications system (100). Satellite (110) operate within the confines of at least one subset of satellites. Satellites (110) allocate channels using a maximum cost list that is based on a cost function methodology. A list of potentially interfering antennas is determined using a cost function analysis. A list of active channels on each one the potentially interfering antennas is also established. Another list that includes a set of potentially interfering channels for each active channel is established. Cost functions are computed for each pair of active channels and its potentially interfering channels. These cost functions establish interference potentials for the available channels in the maximum cost list (400). Channels are allocated using the maximum cost list and interference potential thresholds. Cost functions are based on spatial isolation, spectral isolation, and temporal isolation.

    摘要翻译: 卫星(110图1)用于为通信系统(100)中的SU(120)进行信道分配。 卫星(110)在至少一个卫星子集的范围内运行。 卫星(110)使用基于成本函数方法的最大成本清单分配信道。 使用成本函数分析确定潜在干扰天线的列表。 还建立了每个潜在干扰天线上的活动信道列表。 建立了另一个列表,其中包括一组每个活动通道的潜在干扰通道。 为每对活动通道及其潜在的干扰通道计算成本函数。 这些成本函数为最大成本清单中的可用通道建立了干扰电位(400)。 使用最大成本列表和干扰电位阈值分配信道。 成本函数基于空间隔离,光谱隔离和时间隔离。

    Digital beamforming acquisition system
    7.
    发明授权
    Digital beamforming acquisition system 有权
    数字波束成形采集系统

    公开(公告)号:US06697619B1

    公开(公告)日:2004-02-24

    申请号:US09459295

    申请日:1999-12-10

    IPC分类号: H04Q720

    CPC分类号: H04B7/2041

    摘要: A satellite communications system (10) provides for digital beamforming acquisition. The communications system (10) has an antenna configuration (20) for maintaining communications links with satellite networking equipment, and a signal processing system (30) for processing signals resulting from the communications links. A beamforming subsystem (40) dynamically forms traffic beams and overhead beams, wherein the overhead beams scan overhead areas of the satellite footprint. Overhead areas are defined by areas of the satellite footprint without active traffic channels. The beamforming subsystem (40) includes a channel database configuration (50) containing traffic channel input data and overhead channel input data. A beamforming processor (60) converts the input data contained in the channel database configuration (50) into traffic beams schedules and overhead beam schedules. An antenna management system (70) dynamically forms traffic beams and overhead beams based on the beam schedules.

    摘要翻译: 卫星通信系统(10)提供数字波束成形采集。 通信系统(10)具有用于维护与卫星联网设备的通信链路的天线配置(20),以及用于处理由通信链路产生的信号的信号处理系统(30)。 波束形成子系统(40)动态地形成业务波束和开销波束,其中开销波束扫描卫星覆盖区的开销区域。 开销区域由没有活动的交通信道的卫星覆盖区域定义。 波束形成子系统(40)包括包含业务信道输入数据和开销信道输入数据的信道数据库配置(50)。 波束形成处理器(60)将包含在信道数据库配置(50)中的输入数据转换成业务波束调度和开销波束调度。 天线管理系统(70)基于波束时间表动态地形成业务波束和架空波束。

    Method and apparatus for managing resource allocation conflicts in a communications systems
    8.
    发明授权
    Method and apparatus for managing resource allocation conflicts in a communications systems 失效
    用于管理通信系统中的资源分配冲突的方法和装置

    公开(公告)号:US06377540B1

    公开(公告)日:2002-04-23

    申请号:US09126651

    申请日:1998-07-31

    IPC分类号: G01R3108

    摘要: A conflict resolution center (130 FIG. 1) is used to manage and resolve resource allocation conflicts in communications system (100) including a number of semi-autonomous communications nodes (SACNs). SACN (110) operates semi-autonomously because SACNs cannot independently allocate and de-allocate resources but rather operate within the confines of at least one local neighborhood. SACNs (110) allocate and de-allocate resources locally based on local neighborhood information. A conflict occurs when at least two SACNs try to allocate the same resource. Conflict resolution center (130) resolves conflicts using a number of different procedures. When a conflict can be resolved, conflict resolution center (130) provides resource reallocation data to at least one SACN (110). When a conflict cannot be resolved, conflict resolution center (130) notifies a system administrator.

    摘要翻译: 冲突解决中心(130图1)用于管理和解决包括多个半自主通信节点(SACN))的通信系统(100)中的资源分配冲突。 SACN(110)半自主运行,因为SACN不能独立地分配和分配资源,而是在至少一个当地邻域的范围内运行。 SACN(110)根据本地邻域信息在本地分配和分配资源。 当至少有两个SACN尝试分配相同的资源时,会发生冲突。 冲突解决中心(130)使用许多不同的程序解决冲突。 当冲突解决时,冲突解决中心(130)向至少一个SACN(110)提供资源重新分配数据。 当冲突无法解决时,冲突解决中心(130)通知系统管理员。

    Method and system for multicast using a satellite network
    9.
    发明授权
    Method and system for multicast using a satellite network 失效
    使用卫星网络组播的方法和系统

    公开(公告)号:US06307861B1

    公开(公告)日:2001-10-23

    申请号:US09271701

    申请日:1999-03-18

    IPC分类号: H04J326

    CPC分类号: H04B7/18595

    摘要: A multicast message is transmitted from an originating subscriber unit (110, FIG. 1) through a network of satellite communications nodes (120, 130, and 140) to a plurality of receiving subscriber units (150, 160, and 170). Each message is distributed through the network of satellite communications nodes (120, 130, and 140) and replicated at the node nearest to the receiving subscriber unit. Receiving subscriber units (150, 160, and 170) are mapped into geographic cells which allows a single multicast transmission to be transmitted from the satellite communications node to those subscriber units within the same geographic cell. Multicast groups and membership rules are established by the originating subscriber unit (110) through a service provider (180). A multicast session manager (185) manages the multicast session.

    摘要翻译: 通过卫星通信节点(120,130和140)的网络将多播消息从始发用户单元(110,图1)发送到多个接收用户单元(150,160和170)。 每个消息通过卫星通信节点(120,130和140)的网络分布,并在最接近接收用户单元的节点处复制。 接收用户单元(150,160和170)被映射到允许从卫星通信节点向同一地理小区内的那些用户单元发送单个组播传输的地理小区。 组播组和成员关系规则由始发用户单元(110)通过服务提供商(180)建立。 多播会话管理器(185)管理多播会话。

    Snap to grid variable beam size digital beamforming system
    10.
    发明授权
    Snap to grid variable beam size digital beamforming system 有权
    捕捉到可变光束尺寸数字波束成形系统

    公开(公告)号:US06490448B1

    公开(公告)日:2002-12-03

    申请号:US09459001

    申请日:1999-12-10

    IPC分类号: H04Q720

    CPC分类号: H04B7/2041 H04B7/18543

    摘要: A satellite communications system (10) provides for snap to grid variable beam size digital beamforming. The communications system (10) has an antenna configuration (20) for maintaining communications links with satellite networking equipment, and a signal processing system (30) for processing signals resulting from the communications links. The beamforming subsystem (40) forms beams based on the processed signals wherein the beams match predetermined grid information. The beamforming subsystem (40) includes a grid database (50) containing predetermined grid information. A beamforming processor (60) converts the predetermined grid information contained in the grid database (50) antenna coefficients. An antenna management system forms beams based on the antenna coefficients.

    摘要翻译: 卫星通信系统(10)提供快速到网格可变波束大小的数字波束形成。 通信系统(10)具有用于维护与卫星联网设备的通信链路的天线配置(20),以及用于处理由通信链路产生的信号的信号处理系统(30)。 波束形成子系统(40)基于经处理的信号形成波束,其中波束匹配预定的网格信息。 波束形成子系统(40)包括包含预定网格信息的网格数据库(50)。 波束形成处理器(60)将包含在网格数据库(50)中的预定网格信息转换成天线系数。 天线管理系统基于天线系数形成波束。