-
公开(公告)号：US6084929A
公开(公告)日：2000-07-04
申请号：US7936
申请日：1998-01-16
申请人： Karl Molnar , Greg Bottomley , Rajaram Ramesh
发明人： Karl Molnar , Greg Bottomley , Rajaram Ramesh
IPC分类号： H04L27/01 , H04B1/707 , H04B3/04 , H04B3/06 , H04B7/005 , H04L25/02 , H04L25/03 , H04Q7/38 , H04B1/10
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： A method and apparatus for channel tracking is disclosed wherein pulse-shaping information is used to improve channel tracking performance. Information symbol values are prefiltered using the pulse shape information for a received baseband signal to generate a filtered waveform. The filtered waveform provides a reference signal for a medium response estimation. The estimated medium response is used with a coherent detector to detect unknown information symbols within the baseband signal. Medium response estimates can be determined for a single detected symbol sequence or for each hypothesized symbol sequence.
摘要翻译： 公开了一种用于信道跟踪的方法和装置，其中使用脉冲整形信息来改善信道跟踪性能。 信息符号值使用接收到的基带信号的脉冲形状信息进行过滤，以生成滤波波形。 经滤波的波形提供用于介质响应估计的参考信号。 估计的介质响应与相干检测器一起使用以检测基带信号内的未知信息符号。 可以为单个检测到的符号序列或每个假设的符号序列确定中等响应估计。
-
2.发明授权Method and apparatus for digital symbol detection using medium response estimates 有权使用介质响应估计的数字符号检测方法和装置公开(公告)号：US06252918B1
公开(公告)日：2001-06-26
申请号：US09267378
申请日：1999-03-15
IPC分类号： H04B110
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。
-
3.发明授权Cellular positioning system that compensates for received signal delays in positioning radio receivers 失效蜂窝定位系统，用于补偿定位无线电接收机中的接收信号延迟公开(公告)号：US06518921B1
公开(公告)日：2003-02-11
申请号：US08838027
申请日：1997-04-22
申请人： David R. Irvin , Rajaram Ramesh , Karl Molnar
发明人： David R. Irvin , Rajaram Ramesh , Karl Molnar
IPC分类号： G01S124
摘要： A positioning system locates a mobile unit by compensating for component tolerances in time-of-arrivals of received signals at a plurality of positioning radio receivers. The system determines detection times of the received radio signals at the positioning radio receivers. The system takes into account pre-stored signal delays associated with one or more receiver stages of the corresponding positioning radio receivers and the detection times, for determining time-of-arrivals for the received radio signals.
摘要翻译： 定位系统通过在多个定位无线电接收机处补偿接收到的信号的到达时间内的组件容差来定位移动单元。 该系统确定定位无线电接收机处接收的无线电信号的检测时间。 该系统考虑与相应的定位无线电接收机的一个或多个接收机级相关联的预先存储的信号延迟和检测时间，用于确定接收到的无线电信号的到达时间。
-
4.发明授权Systems and methods for locating remote terminals in radiocommunication systems 失效用于定位无线电通信系统中的远程终端的系统和方法
公开(公告)号：US6040800A
公开(公告)日：2000-03-21
申请号：US839864
申请日：1997-04-22
CPC分类号： G01S5/14 , G01S5/06 , H04W4/22 , H04W76/007
摘要： Emergency call handling may, in the near future, require terminal unit location information to be provided to emergency service centers. Exemplary embodiments of the present invention provide improved techniques for using a system of monitoring or adjunct stations to provide this location information to the emergency service centers. For example, either time of arrival (TOA) or time difference of arrival (TDOA) techniques can be selectively used to process received signals and provide location information. Techniques for improving timing estimates are also disclosed.
摘要翻译： 在不久的将来，紧急呼叫处理可能需要向紧急服务中心提供终端单元位置信息。 本发明的示例性实施例提供了使用监控系统或附加站的改进技术来向紧急服务中心提供该位置信息。 例如，可以有选择地使用到达时间（TOA）或到达时差（TDOA）技术来处理接收到的信号并提供位置信息。 还公开了用于改善时序估计的技术。
-
公开(公告)号：US5889827A
公开(公告)日：1999-03-30
申请号：US766167
申请日：1996-12-12
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
-
6.发明授权Method and apparatus for digital symbol detection using medium response estimates 有权使用介质响应估计的数字符号检测方法和装置公开(公告)号：US06603827B2
公开(公告)日：2003-08-05
申请号：US09769995
申请日：2001-01-25
IPC分类号： H04B169
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。
-
公开(公告)号：US5907809A
公开(公告)日：1999-05-25
申请号：US710761
申请日：1996-09-20
申请人： Karl Molnar , Rajaram Ramesh , Amer Aref Hassan , Barbara Molnar
发明人： Karl Molnar , Rajaram Ramesh , Amer Aref Hassan , Barbara Molnar
IPC分类号： H01Q3/26 , G01S3/14 , G01S3/28 , G01S5/04 , G01S5/12 , G01S5/14 , G01S19/25 , H01Q1/24 , H01Q21/08 , H01Q21/28 , H04B7/08 , H04B7/10 , H04B7/185 , H04L1/00 , H04L1/06 , H04L25/03 , H04W16/28 , H04W64/00 , H04B7/26 , G01S3/72 , G01S5/02
CPC分类号： G01S5/14 , G01S3/28 , G01S5/04 , H01Q1/246 , H01Q21/08 , H01Q21/28 , H04B7/0851 , H04B7/10 , H04B7/18515 , H04B7/18532 , H04B7/18545 , H04B7/18567 , H04L1/0069 , H04L1/0071 , H04L1/06 , H04L25/03331 , H04W64/00 , G01S3/146 , G01S5/12 , H04B7/0837 , H04L2001/0098 , H04W16/28
摘要： Exemplary embodiments of the present invention describe terminal position location methods and systems. Relative powers of nearby spot beams which are generated by array antennas are determined. For example, powers from six neighboring spot beams relative to a center spot beam within which a mobile station is currently operating, can be measured relative to the power of the center spot beam. Using information from these measurements, the mobile stations position can be determined using, for example, an exponential model of the spot beam pattern.
摘要翻译： 本发明的示例性实施例描述了终端位置定位方法和系统。 确定由阵列天线产生的附近点波束的相对功率。 例如，可以相对于中心点光束的功率测量相对于移动台当前正在其中操作的中心点波束的六个相邻点波束的功率。 使用来自这些测量的信息，可以使用例如点波束图案的指数模型来确定移动台位置。
-
公开(公告)号：US5661724A
公开(公告)日：1997-08-26
申请号：US574141
申请日：1995-12-18
CPC分类号： H04B7/18534
摘要： A diversity scheme for allowing a transmitter/receiver, such as a mobile unit in a mobile telecommunications system, to exchange communication signals with more than one control station, such as a base station or satellite. According to an exemplary embodiment of the diversity scheme, the mobile unit scans for the control channel of a second satellite during idle time slots while communicating with a first satellite during active time slots. Once the mobile unit detects a control channel from a second satellite, the mobile unit stores synchronization information and establishes a communication link with the second satellite if shadowing or other severe fading causes signal quality over a communication link established with a first satellite to fall below a threshold level. The diversity scheme also allows the mobile unit to communicate simultaneously with two satellites, using alternate TDMA frames.
摘要翻译： 用于允许诸如移动电信系统中的移动单元的发射机/接收机与诸如基站或卫星的多于一个控制站交换通信信号的分集方案。 根据分集方案的示例性实施例，移动单元在空闲时隙期间扫描第二卫星的控制信道，同时在活动时隙期间与第一卫星通信。 一旦移动单元检测到来自第二卫星的控制信道，则移动单元存储同步信息并与第二卫星建立通信链路，如果阴影或其他严重衰落导致通过与第一卫星建立的通信链路的信号质量降至低于 门限等级。 分集方案还允许移动单元使用备用TDMA帧同时与两颗卫星通信。
-
公开(公告)号：US06493322B1
公开(公告)日：2002-12-10
申请号：US08840268
申请日：1997-04-14
IPC分类号： H04J314
CPC分类号： H04B7/18534
摘要： A diversity scheme for allowing a transmitter/receiver, such as a mobile unit in a mobile telecommunications system, to exchange communication signals with more than one control station, such as a base station or satellite. According to an exemplary embodiment of the diversity scheme, the mobile unit scans for the control channel of a second satellite during idle time slots while communicating with a first satellite during active time slots. Once the mobile unit detects a control channel from a second satellite, the mobile unit stores synchronization information and establishes a communication link with the second satellite if shadowing or other severe fading causes signal quality over a communication link established with a first satellite to fall below a threshold level. The diversity scheme also allows the mobile unit to communicate simultaneously with two satellites, using alternate TDMA frames.
摘要翻译： 用于允许诸如移动电信系统中的移动单元的发射机/接收机与诸如基站或卫星的多于一个控制站交换通信信号的分集方案。 根据分集方案的示例性实施例，移动单元在空闲时隙期间扫描第二卫星的控制信道，同时在活动时隙期间与第一卫星通信。 一旦移动单元检测到来自第二卫星的控制信道，则移动单元存储同步信息并与第二卫星建立通信链路，如果阴影或其他严重衰落导致通过与第一卫星建立的通信链路的信号质量降至低于 门限等级。 分集方案还允许移动单元使用备用TDMA帧同时与两颗卫星通信。
-
10.发明申请Method and apparatus for signal quality loss compensation in multiplexing transmission systems 有权复用传输系统信号质量损失补偿的方法和装置公开(公告)号：US20070008943A1
公开(公告)日：2007-01-11
申请号：US11138724
申请日：2005-05-26
申请人： Stephen Grant , Jung-fu Cheng , Karl Molnar , Yi-Pin Wang , Rajaram Ramesh
发明人： Stephen Grant , Jung-fu Cheng , Karl Molnar , Yi-Pin Wang , Rajaram Ramesh
IPC分类号： H04B7/216
CPC分类号： H04L1/0026 , H04B7/061 , H04B7/0678 , H04B7/0691 , H04B7/0697 , H04B17/309 , H04L1/0003 , H04L1/0009 , H04L1/0033 , H04L1/06 , H04L1/20 , H04L5/0057 , H04W24/10
摘要： A wireless communication receiver receiving a multiplexed signal comprising two or more signal streams calculates a received signal quality for the multiplexed signal as a function of stream-specific received signal qualities, determines one or more loss parameters indicative of variations in the stream-specific received signal qualities, and generates quality feedback based on such information. In turn, a transmitter controls the selection of one or more transmission parameters of the multiplexed signal based on the quality feedback, such that its transmit link adaptations account for the losses in received signal quality at the receiver arising from the variations in the stream-specific received signal qualities. The quality feedback may include calculated loss values, or parameter/penalties that permit loss calculation, and the method applies to both code multiplexing and spatial multiplexing.
摘要翻译： 接收包括两个或多个信号流的多路复用信号的无线通信接收机根据流专用接收信号质量计算多路复用信号的接收信号质量，确定一个或多个指示流特定接收信号变化的丢失参数 质量，并根据这些信息产生质量反馈。 反过来，发射机基于质量反馈来控制对多路复用信号的一个或多个传输参数的选择，使得其发射链路适应性考虑到接收机的接收信号质量中由于流特定的变化引起的损耗 收到信号质量。 质量反馈可以包括计算的损失值或允许损耗计算的参数/惩罚，并且该方法适用于码复用和空间复用两者。
-
-
-
-
-
-
-
-
-
搜索结果
55 条记录 (耗时 0.02 秒)
