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159 条记录 (耗时 0.03 秒)

    Apparatus and methods for finger delay selection in RAKE receivers
    82.
    发明授权
    Apparatus and methods for finger delay selection in RAKE receivers 有权
    RAKE接收机中手指延迟选择的装置和方法

    公开(公告)号：US06922434B2

    公开(公告)日：2005-07-26

    申请号：US09845950

    申请日：2001-04-30

    申请人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Kenzo Urabe

    发明人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Kenzo Urabe

    IPC分类号： H04B1/7117 ,  H04B1/712 ,  H04B1/69

    CPC分类号： H04B1/712 ,  H04B1/7117 ,  H04B2201/709727

    摘要： Methods of recovering information encoded in a spread spectrum signal transmitted according to a spreading sequence in a communications medium are provided in which a spread spectrum signal is received from the communications medium and correlated with a spreading sequence to produce a plurality of time-offset correlations. Some of these time-offset correlations may be designed to cancel out known interfering signals. A subset of the plurality of time-offsets may then be selected, and corresponding traffic correlations may then be combined using a weighted combination to estimate information encoded in the transmitted spread spectrum signal. Receivers for implementing these methods are also provided.

    摘要翻译： 提供了恢复在通信介质中根据扩展序列发送的扩频信号中编码的信息的方法，其中从通信介质接收扩频信号并与扩展序列相关联以产生多个时间偏移相关。 这些时间偏移相关中的一些可被设计为消除已知的干扰信号。 然后可以选择多个时间偏移的子集，然后可以使用加权组合来组合对应的业务相关性，以估计在所发送的扩展频谱信号中编码的信息。 还提供了实现这些方法的接收器。

    Rate detection in radio communication systems
    83.
    发明授权
    Rate detection in radio communication systems 有权
    无线电通信系统中的速率检测

    公开(公告)号：US06917629B1

    公开(公告)日：2005-07-12

    申请号：US09152063

    申请日：1998-09-11

    申请人： Rajaram Ramésh ,  Gregory E. Bottomley

    发明人： Rajaram Ramésh ,  Gregory E. Bottomley

    IPC分类号： H04L1/00 ,  H04L1/08 ,  H04J3/06

    CPC分类号： H04L1/0038 ,  H04L1/0013 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/0061 ,  H04L1/08

    摘要： An improved system and method for rate detection of transmitted signals is disclosed for use in a IS-95 CDMA downlink. For each speech frame, one of four possible bit rates is used to encode the frame according to the standard. The present invention describes a receiver and various processes that are able to detect which rate was sent without the aid of flag bits or other mode indication information. According to various embodiments of the invention different rate detection processes which can exploit additional code information, such as CRC checks and convolutional coding, are disclosed.

    摘要翻译： 公开了用于IS-95 CDMA下行链路中的用于传输信号的速率检测的改进的系统和方法。 对于每个语音帧，四种可能的比特率之一用于根据标准对帧进行编码。 本发明描述了一种接收机和能够检测哪个速率被发送而不借助于标志位或其他模式指示信息的各种过程。 根据本发明的各种实施例，公开了可以利用附加码信息（诸如CRC校验和卷积编码）的不同速率检测过程。

    Method and apparatus for digital symbol detection using medium response estimates
    87.
    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

    申请人： Gregory E. Bottomley ,  Karl Molnar ,  Rajaram Ramesh

    发明人： Gregory E. Bottomley ,  Karl Molnar ,  Rajaram Ramesh

    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。

    Methods and apparatus for joint demodulation of adjacent channel signals in digital communications systems
    88.
    发明授权
    Methods and apparatus for joint demodulation of adjacent channel signals in digital communications systems 失效
    数字通信系统中相邻信道信号联合解调的​​方法和装置

    公开(公告)号：US6108517A

    公开(公告)日：2000-08-22

    申请号：US901694

    申请日：1997-07-28

    申请人： Huseyin Arslan ,  Someshwar C. Gupta ,  Gregory E. Bottomley ,  Sandeep Chennakeshu

    发明人： Huseyin Arslan ,  Someshwar C. Gupta ,  Gregory E. Bottomley ,  Sandeep Chennakeshu

    IPC分类号： H04J1/12 ,  H04B1/10 ,  H04B7/26 ,  H04L25/02 ,  H04L25/03 ,  H04Q7/36 ,  H04B7/10

    CPC分类号： H04L25/03331 ,  H04L25/0204

    摘要： Methods and apparatus for receiving adjacent channel signals wherein adjacent channel interference effects are minimized through joint demodulation of the adjacent channel signals. A channel associated with each signal and each corresponding frequency band is estimated and used to form joint branch metrics for joint sequence estimation. In an exemplary embodiment, a baseband processor receives baseband samples corresponding to at least one carrier frequency, and then jointly demodulates at least two information streams corresponding to different carrier frequencies in dependence upon the received baseband samples. In another embodiment, a joint channel estimator receives at least two baseband sample streams, each stream corresponding to a different frequency band, and jointly estimates medium responses for each of at least two information signals which were transmitted in different frequency bands.

    摘要翻译： 用于接收相邻信道信号的方法和装置，其中相邻信道干扰效应通过相邻信道信号的联合解调被最小化。 与每个信号和每个对应的频带相关联的信道被估计并用于形成用于联合序列估计的联合分支度量。 在示例性实施例中，基带处理器接收对应于至少一个载波频率的基带采样，然后根据所接收的基带采样，共同解调对应于不同载波频率的至少两个信息流。 在另一个实施例中，联合信道估计器接收对应于不同频带的每个流的至少两个基带采样流，并联合估计在不同频带中发送的至少两个信息信号中的每一个的媒体响应。

    Systems and methods for identifying emergency calls in radiocommunication systems
    89.
    发明授权
    Systems and methods for identifying emergency calls in radiocommunication systems 失效
    用于识别无线电通信系统中的紧急呼叫的系统和方法

    公开(公告)号：US6073005A

    公开(公告)日：2000-06-06

    申请号：US839860

    申请日：1997-04-22

    申请人： Alex K. Raith ,  Gregory E. Bottomley ,  John Diachina

    发明人： Alex K. Raith ,  Gregory E. Bottomley ,  John Diachina

    IPC分类号： H04W4/22 ,  H04H7/04 ,  H04Q7/32

    CPC分类号： H04W4/22 ,  H04W76/007

    摘要： The handling of emergency calls, e.g., 911 calls, should be performed on an expedited basis. In radiocommunication systems, knowledge by the mobile unit that an emergency call is being placed can be used to expedite and optimize emergency call handling. Various techniques are described herein to identify emergency calls when placed by a mobile user. Moreover, the provision of auxiliary alarm functions for the mobile unit are also described.

    摘要翻译： 紧急呼叫的处理，例如911呼叫应该在加急的基础上进行。 在无线电通信系统中，可以使用由移动单元发出的紧急呼叫的知识来加速和优化紧急呼叫处理。 本文描述了各种技术，以在由移动用户放置时识别紧急呼叫。 此外，还描述了为移动单元提供辅助报警功能。

    Method and apparatus for CDMA signal orthogonalization
    90.
    发明授权
    Method and apparatus for CDMA signal orthogonalization 失效
    CDMA信号正交化的方法和装置

    公开(公告)号：US5615209A

    公开(公告)日：1997-03-25

    申请号：US507714

    申请日：1995-07-26

    申请人： Gregory E. Bottomley

    发明人： Gregory E. Bottomley

    IPC分类号： H04B1/7107 ,  H04J13/00

    CPC分类号： H04B1/7107

    摘要： Orthogonalization techniques are disclosed which can be used, for example, to improve subtration of CDMA signals from a composite spread spectrum signal or to improve detection of CDMA signals from the composite spread spectrum signal. According to exemplary embodiments, a Gram-Schmidt orthogonalization process is used to modify signature sequences which are each associated with a particular CDMA signal in the spread spectrum composite signal. These modified signature sequences can then be used to spread correlations of the original signature sequences in the subtraction process or in the detection process to improve performance. Pre-orthogonalization according to the present invention, eliminates or mitigates multiple access interference.

    摘要翻译： 公开了正交化技术，其可以用于例如改进来自复合扩频信号的CDMA信号的减法，或改进来自复合扩频信号的CDMA信号的检测。 根据示例性实施例，使用Gram-Schmidt正交化处理来修改每个与扩频复合信号中的特定CDMA信号相关联的签名序列。 然后，这些修改的签名序列可用于在减法过程或检测过程中扩展原始签名序列的相关性，以提高性能。 根据本发明的预正交化消除或减轻多址干扰。