-
公开(公告)号：US6157681A
公开(公告)日：2000-12-05
申请号：US55395
申请日：1998-04-06
摘要： A transmitter system (18) which transmits a communication signal (14) through a phased-array antenna (10) uses a signal processor (26) and a multiplicity of direct modulators (30). Each direct modulator (30) drives a single element (12) of the antenna (10). Each direct modulator (30) receives a digital baseband phase point data signal (62) from a digital data stream (28). The digital data stream (28) also conveys digital beam formation data (60). Each direct modulator (30) digitally combines the baseband phase point data (62) with the beam formation data (60) to produce digital streams that modulate an RF carrier signal (34). The digital data stream (28) is generated by a phased-array signal processor (26) which processes user data bits (86) received from any number of input signals (22) and processes beam signals (24). In one embodiment, the signal processor (26) calculates phase point data (62) representative of all input signals (22).
摘要翻译： 通过相控阵天线（10）发送通信信号（14）的发射机系统（18）使用信号处理器（26）和多个直接调制器（30）。 每个直接调制器（30）驱动天线（10）的单个元件（12）。 每个直接调制器（30）从数字数据流（28）接收数字基带相位点数据信号（62）。 数字数据流（28）还传送数字波束形成数据（60）。 每个直接调制器（30）将基带相位点数据（62）与波束形成数据（60）进行数字组合，以产生调制RF载波信号（34）的数字流。 数字数据流（28）由处理从任意数量的输入信号（22）接收的用户数据位（86）并处理波束信号（24）的相控阵列信号处理器（26）产生。 在一个实施例中，信号处理器（26）计算表示所有输入信号（22）的相位点数据（62）。
-
2.发明授权Method and beam stepping apparatus for a satellite cellular communication system 失效用于卫星蜂窝通信系统的方法和波束步进装置
公开(公告)号：US5739784A
公开(公告)日：1998-04-14
申请号：US560605
申请日：1995-11-20
CPC分类号： H04B7/2041
摘要： In a satellite cellular communication system (10), a phased array antenna (41) includes a dynamic beamformer (50) that provides individual antenna beams (35) within which communications with subscriber units (26) take place. The satellites (12) are located in several orbits (14). As the satellites move with respect to Earth's surface, each of the antenna beams is stepped backward (104) to compensate for the satellites movement. After each satellite travels a distance equal to a predetermined portion of the satellites' spacing in the orbit, each satellite's antenna beams are stepped forward (116) to replace the previous satellite's footprint. Accordingly, cell-to-cell hand-off is not required for subscriber units communicating within an antenna beam.
摘要翻译： 在卫星蜂窝通信系统（10）中，相控阵天线（41）包括动态波束形成器（50），其提供与用户单元（26）进行通信的各个天线波束（35）。 卫星（12）位于几个轨道（14）中。 当卫星相对于地球表面移动时，每个天线波束都向后退（104）以补偿卫星移动。 在每个卫星行进距离等于轨道中的卫星间隔的预定部分的距离之后，每个卫星的天线波束向前前进（116）以替代先前的卫星的足迹。 因此，在天线波束内通信的用户单元不需要对小区切换。
-
公开(公告)号：US6043920A
公开(公告)日：2000-03-28
申请号：US905760
申请日：1997-08-04
CPC分类号： H04B10/11
摘要： A laser transmitter (200, 300) includes a femptosecond pulse forming circuit (214, 308) and an ultra high-speed optical switch (218, 304) which enable the transmitter (200, 300) to generate a modulated pulse stream having pulses with widths of under 200 femptoseconds. The transmitted pulse stream is processed by a laser detector (500), including a wideband optical detector (504) and pulse stretching circuit (506), that regenerates information included in the modulated pulse stream.
摘要翻译： 激光发射器（200,300）包括飞秒脉冲形成电路（214,308）和超高速光开关（218,304），其使得发射机（200,300）能够产生具有脉冲的调制脉冲流 宽度不超过200飞秒。 所发射的脉冲流由激光检测器（500）处理，包括宽带光学检测器（504）和脉冲延伸电路（506），其重新产生包含在调制脉冲流中的信息。
-
公开(公告)号：US06181684B2
公开(公告)日：2001-01-30
申请号：US09017157
申请日：1998-02-02
IPC分类号： H04J322
CPC分类号： H04J4/00 , H04B7/2643
摘要： Methods (600, 700), an access controller (350), and a communication system (300) for optimizing utilization of a wireless communication link in a limited bandwidth communication system or network are provided. Statistical multiplexing is achieved by partitioning a wireless communication link (240) into multiple communication channels (250) and assigning communication sources (220) to communicate information over an air interface for a predetermined time interval, where the number of communication sources (220) assigned to the communication channels (250) during a particular time interval exceeds the number of available communication channels (250). The methods (600, 700), access controller (350), and communication system (300) disclosed also allow a system operator to provide varying levels of quality of service (QoS) guarantees in a communication system or network using statistical multiplexing by designating varying levels of QoS among the communication channels (250).
摘要翻译： 提供了用于优化有限带宽通信系统或网络中的无线通信链路的利用的方法（600,700），接入控制器（350）和通信系统（300）。 通过将无线通信链路（240）划分成多个通信信道（250）并且分配通信源（220）以在空中接口上传送信息达预定的时间间隔来实现统计复用，其中分配了通信源（220）的数量 在特定时间间隔期间到通信信道（250）超过可用通信信道的数量（250）。 公开的方法（600,700），接入控制器（350）和通信系统（300）还允许系统运营商通过使用统计多路复用来在通信系统或网络中提供不同级别的服务质量（QoS）保证， 通信信道中的QoS级别（250）。
-
5.发明授权Cellular communication system with efficient channel assignments and method therefor 失效蜂窝通信系统，具有高效的信道分配及其方法
公开(公告)号：US5826189A
公开(公告)日：1998-10-20
申请号：US715113
申请日：1996-09-17
IPC分类号： H04B7/185
CPC分类号： H04B7/18539 , H04W28/16
摘要： A cellular communication system (10) forms cells (18) from low earth orbit satellites (12). The system (10) uses an off-line process (24) to identify cells (18) that fall within various reuse distances of other cells (18) and to save system usage statistics. An on-line process (42) associates a demand with each cell (18), and the demand is predicted from the system usage statistics. Need factors assigned in response to the cells' demands are ranked and processed by an inner loop that assigns the various ones of the cells (18) to one channel (22) at a time and an outer loop that performs the inner loop for many different channels (22). The inner loop assigns cells (18) to a selected channel (22) in accordance with the need factor ranking.
摘要翻译： 蜂窝通信系统（10）从低地球轨道卫星（12）形成小区（18）。 系统（10）使用离线过程（24）来识别落入其他小区（18）的各种重用距离内的小区（18）并且保存系统使用统计信息。 在线处理（42）将需求与每个单元（18）相关联，并且根据系统使用统计来预测需求。 响应于细胞需求而分配的需要因素被一个内循环进行排序和处理，所述内循环一次分配单个（18）中的各个单元（18）到一个通道（22），并且外循环执行许多不同的内循环 通道（22）。 内部循环根据需要因素排列将单元（18）分配给所选择的通道（22）。
-
6.发明授权
公开(公告)号：US5805574A
公开(公告)日：1998-09-08
申请号：US508807
申请日：1995-07-28
CPC分类号： H04B7/18539 , H04W84/06 , H04W88/02
摘要： A telecommunication network (10) includes satellites (12) in which cellular base station switches (42) are located. Each switch (42) is hardware configured to require the use of relatively few interconnection segments but would suffer a significant amount of call blocking if operated in a conventional manner. A new call setup process (96) is performed whenever a request to setup a new call is received at the switch (42). The process (96) defines new connections through switch 42 for ongoing calls while simultaneously defining a new connection for the new call. In addition, the process (96) forces the new connections to use only those interconnection segments that are reasonably required to implement the new connections. Segments that are not required are deactivated (128) to reduce power consumption.
摘要翻译： 电信网络（10）包括蜂窝基站交换机（42）所在的卫星（12）。 每个开关（42）被硬件配置为要求使用相对较少的互连段，但是如果以常规方式操作则会遭受大量的呼叫阻塞。 每当在交换机（42）处接收到建立新呼叫的请求时，执行新的呼叫建立过程（96）。 过程（96）通过开关42定义用于正在进行的呼叫的新连接，同时为新呼叫定义新的连接。 另外，过程（96）强制新连接仅使用合理需要的那些互连段来实现新的连接。 禁用不需要的段（128）以减少功耗。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.02 秒)
