利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

45 条记录 (耗时 0.032 秒)

    Access channel slot sharing
    1.
    发明授权
    Access channel slot sharing 有权
    访问通道槽共享

    公开(公告)号：US6167056A

    公开(公告)日：2000-12-26

    申请号：US189357

    申请日：1998-11-09

    申请人： David S. Miller ,  Rajiv Vijayan ,  Ephraim Zehavi ,  Jeffrey A. Levin

    发明人： David S. Miller ,  Rajiv Vijayan ,  Ephraim Zehavi ,  Jeffrey A. Levin

    IPC分类号： H04B1/707 ,  H04B7/185 ,  H04B7/216 ,  H04B7/26 ,  H04J3/06 ,  H04L7/00 ,  H04L27/30

    CPC分类号： H04B7/18532 ,  H04B1/7077 ,  H04B1/708 ,  H04B7/216 ,  H04B7/2637

    摘要： The present invention is a system and method for increasing user capacity on a slotted random access channel in a spread spectrum communications system by using a multi-part access probe. First and second parts of the access probe are modulated using a short PN code sequence, and the entire access probe is modulated using a long PN code sequence. Information to be transmitted by the access probe is modulated on the second part of the access probe, and the access probe is transmitted so that the first part of the probe falls within the boundaries of an access channel slot. In one embodiment, time slots in access channels used for access signal reception are made the length of the first part. In a further embodiment, time slots in a plurality of adjacent access channels used for access signal reception may be longer than said first part but are offset in time from each other by the length or period of the first part.

    摘要翻译： 本发明是一种通过使用多部分接入探针来增加扩频通信系统中的时隙随机接入信道上的用户容量的系统和方法。 使用短PN码序列对接入探测器的第一和第二部分进行调制，并且使用长PN码序列调制整个接入探测器。 由接入探针发送的信息在接入探针的第二部分被调制，并且发送接入探针，使得探测器的第一部分落在接入信道时隙的边界内。 在一个实施例中，用于访问信号接收的接入信道中的时隙被做成第一部分的长度。 在另一个实施例中，用于访问信号接收的多个相邻访问信道中的时隙可以比所述第一部分更长，但是在时间上彼此偏移了第一部分的长度或周期。

    Method and apparatus for canceling pilot interference in a wireless communication system
    3.
    发明授权
    Method and apparatus for canceling pilot interference in a wireless communication system 有权
    用于消除无线通信系统中的导频干扰的方法和装置

    公开(公告)号：US08644264B2

    公开(公告)日：2014-02-04

    申请号：US12900394

    申请日：2010-10-07

    申请人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K. Butler ,  Jeffrey A. Levin ,  Thomas B. Wilborn ,  Paul E. Bender

    发明人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K. Butler ,  Jeffrey A. Levin ,  Thomas B. Wilborn ,  Paul E. Bender

    IPC分类号： H03D1/04

    CPC分类号： H04B1/7107 ,  H04B2201/70701

    摘要： Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

    摘要翻译： 用于估计和消除无线（例如，CDMA）通信系统中的导频干扰的方法和系统。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列。 由多个干扰多径导致的导频干扰估计被累加以导出总导频干扰，其从数据样本中减去以提供导频取消的数据采样。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。

    Method and apparatus for canceling pilot interference in a wireless communication system
    5.
    发明授权
    Method and apparatus for canceling pilot interference in a wireless communication system 有权
    用于消除无线通信系统中的导频干扰的方法和装置

    公开(公告)号：US07190749B2

    公开(公告)日：2007-03-13

    申请号：US09974935

    申请日：2001-10-10

    申请人： Jeffrey A. Levin ,  Thomas B. Wilborn ,  Brian K. Butler ,  Paul E. Bender

    发明人： Jeffrey A. Levin ,  Thomas B. Wilborn ,  Brian K. Butler ,  Paul E. Bender

    IPC分类号： H03D1/04 ,  H04B1/707

    CPC分类号： H04B1/7107 ,  H04B2201/70701

    摘要： Techniques for canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence to provide the estimated pilot interference. The pilot interference estimates due to all interfering multipaths are combined to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

    摘要翻译： 用于在无线（例如CDMA）通信系统中消除导频干扰的技术。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列提供估计的导频干扰。 由于所有干扰多径导致的导频干扰估计被组合以导出总导频干扰，其从数据样本中减去以提供导频取消的数据样本。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。

    Method and apparatus for energy estimation in a wireless receiver capable of receiving multiple instances of a common signal
    6.
    发明授权
    Method and apparatus for energy estimation in a wireless receiver capable of receiving multiple instances of a common signal 有权
    能够在能够接收公共信号的多个实例的无线接收机中进行能量估计的方法和装置

    公开(公告)号：US06229841B1

    公开(公告)日：2001-05-08

    申请号：US09258086

    申请日：1999-02-25

    申请人： Jeffrey A. Levin ,  Christopher C. Riddle ,  Thomas B. Sherman

    发明人： Jeffrey A. Levin ,  Christopher C. Riddle ,  Thomas B. Sherman

    IPC分类号： H04B1707

    CPC分类号： H04B1/7115 ,  H04B1/712

    摘要： In a remote unit receiver capable of demodulating a plurality of signal instances corresponding to a singe remote unit transmitted signal, a first instance of a signal is demodulated to produce a first set of energy values corresponding to a set of possible data values of the signal. A second instance of the signal is demodulated to produce a second set of energy values corresponding to the set of possible data values. The first and the second sets of energy values are then combined to determine a combined set of energy values. A first estimate of a most likely transmitted data value is determined based upon the combined set of energy values An energy level of the first instance is determined based upon the energy value within the first set of energy values corresponding to the first estimate of the most likely transmitted data value.

    摘要翻译： 在能够解调与单个远程单元发送信号相对应的多个信号实例的远程单元接收机中，解调信号的第一实例以产生对应于信号的一组可能数据值的第一组能量值。 解调信号的第二实例以产生对应于该组可能数据值的第二组能量值。 然后组合第一和第二组能量值以确定组合的能量值集合。 基于组合的能量值来确定最可能的传输数据值的第一估计。基于能够在第一组能量值内的能量值来确定第一实例的能级，所述能量值对应于最可能的第一估计值 传输数据值。

    Method of searching for a bursty signal
    7.
    发明授权
    Method of searching for a bursty signal 失效
    搜索突发信号的方法

    公开(公告)号：US5867527A

    公开(公告)日：1999-02-02

    申请号：US810744

    申请日：1997-03-04

    申请人： Noam A. Ziv ,  Roberto Padovani ,  Jeffrey A. Levin ,  Kenneth D. Easton

    发明人： Noam A. Ziv ,  Roberto Padovani ,  Jeffrey A. Levin ,  Kenneth D. Easton

    IPC分类号： H04L1/02 ,  H04B1/707 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L27/30 ,  H04Q7/20 ,  H04B15/00 ,  H04K1/00

    CPC分类号： H04B1/70752 ,  H04B1/707 ,  H04B1/70756 ,  H04B7/2628 ,  H04J13/0048 ,  H04B1/7113 ,  H04B1/7117 ,  H04B2201/70703

    摘要： An integrated search processor used in a modem for a spread spectrum communications system buffers receive samples and utilizes a time sliced transform processor operating on successive offsets from the buffer. The search processor autonomously steps through a search as configured by a microprocessor specified search parameter set, which can include the group of antennas to search over, the starting offset and width of the search window to search over, and the number of Walsh symbols to accumulate results at each offset. The search processor calculates the correlation energy at each offset, and presents a summary report of the best paths found in the search to use for demodulation element reassignment. The search is done in a linear fashion independent of the probability that a signal being searched for was transmitted at any given time.

    摘要翻译： 用于扩展频谱通信系统的调制解调器中的集成搜索处理器缓冲器接收采样并利用对来自缓冲器的连续偏移量进行操作的时间分片变换处理器。 搜索处理器自主地通过由微处理器指定的搜索参数集配置的搜索进行搜索，该搜索参数集可以包括要搜索的天线组，要搜索的搜索窗口的起始偏移和宽度以及要累积的沃尔什符号的数量 结果在每个偏移。 搜索处理器计算每个偏移处的相关能量，并呈现搜索中发现的用于解调元件重新分配的最佳路径的汇总报告。 搜索是以线性方式进行的，与在任何给定时间发送信号的概率无关。

    Method and apparatus for providing ROM in an integrated circuit having update through single substance layer modification capability
    9.
    发明授权
    Method and apparatus for providing ROM in an integrated circuit having update through single substance layer modification capability 失效

    公开(公告)号：US5590069A

    公开(公告)日：1996-12-31

    申请号：US324433

    申请日：1994-10-17

    申请人： Jeffrey A. Levin

    发明人： Jeffrey A. Levin

    IPC分类号： G11C17/12 ,  G11C17/00

    CPC分类号： G11C17/12

    摘要： A ROM circuit that can be modified via the alteration of any one of a set of substance layers is described. The ROM circuit includes a set of ROM cells each of which provide one bit of data used to construct the fixed binary number. Each ROM cell includes a set of circuits that can be placed in either a first or second state via modification of a single substance layer that is different for each circuit, and generates a signal in a logic state that depends on whether the number of circuits in the first state is odd or even. When a design revision occurs the state of one of the circuits from the set of circuits is modified to update the fixed binary number using one of the substance layer already being modified during the course of the design revision.