利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

159 条记录 (耗时 0.028 秒)

    Pseudorandom number sequence generation in radiocommunication systems
    1.
    发明授权
    Pseudorandom number sequence generation in radiocommunication systems 失效
    无线电通信系统中的伪随机数序列生成

    公开(公告)号：US06282181B1

    公开(公告)日：2001-08-28

    申请号：US09065590

    申请日：1998-04-24

    申请人： Wayne Stark ,  Gregory E. Bottomley ,  Paul W. Dent

    发明人： Wayne Stark ,  Gregory E. Bottomley ,  Paul W. Dent

    IPC分类号： H04B7216

    CPC分类号： G06F7/724

    摘要： Pseudorandom number sequence generation is a significant component in a variety of existing and proposed CDMA systems. In CDMA handsets, techniques for sequence generation in conjunction with sleep mode are an important component in paging performance and standby time. Techniques are described herein for properly advancing sequence states in conjunction with, for example, sleep mode without detrimentally draining battery capacity.

    摘要翻译： 伪随机数序列生成是各种现有和提出的CDMA系统中的重要组成部分。 在CDMA手机中，结合睡眠模式的序列生成技术是寻呼性能和待机时间的重要组成部分。 这里描述了与例如睡眠模式一起正确地提升序列状态而不会不利地耗尽电池容量的技术。

    Multiple access coding using bent sequences for mobile radio communications
    2.
    发明授权
    Multiple access coding using bent sequences for mobile radio communications 失效
    使用用于移动无线电通信的弯曲序列的多址接入编码

    公开(公告)号：US5550809A

    公开(公告)日：1996-08-27

    申请号：US291693

    申请日：1994-08-16

    申请人： Gregory E. Bottomley ,  Paul W. Dent

    发明人： Gregory E. Bottomley ,  Paul W. Dent

    IPC分类号： H04Q7/38 ,  H01J13/00 ,  H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04J13/12 ,  H04J13/16 ,  H04L1/00 ,  H04L1/02 ,  H04L9/00 ,  H04L9/18

    CPC分类号： H04L1/0057 ,  H04B1/707 ,  H04J13/00 ,  H04J13/0048 ,  H04J13/12 ,  H04J13/004 ,  H04J13/16 ,  H04L2209/04 ,  H04L2209/34

    摘要： Information symbols spread using orthogonal or bi-orthogonal codewords are assigned a unique scramble mask that is taken from a set of scramble masks having selected correlation properties. The set of scramble masks is selected such that the correlation between the modulo-2 sum of two scramble masks with any codeword is a constant magnitude, independent of the codeword and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scramble masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.

    摘要翻译： 使用正交或双正交码字扩展的信息符号被分配为从具有所选相关属性的一组加扰掩码取得的唯一加扰掩码。 选择这组加扰掩码，使得两个加扰掩模与任何码字的模2之和之间的相关性是恒定的量级，与码字和被比较的各个掩码无关。 在一个实施例中，当使用模2算术对任何两个掩模求和时，该和的沃尔什变换导致最大平均沃尔什频谱。 对于使用减法CDMA解调技术的蜂窝无线电话系统，双层加密系统通过使用伪随机生成的代码密钥来选择在特定小区中的所有移动站公共的加密掩码之一来确保蜂窝系统级的安全性。 此外，通过在加扰操作之前使用伪随机生成的加密密钥来加密各个信息信号来确保个人移动用户级别的隐私。

    Interference mitigation by joint decoding of overlapped signals
    4.
    发明授权
    Interference mitigation by joint decoding of overlapped signals 失效
    通过联合解码重叠信号进行干扰减轻

    公开(公告)号：US5937015A

    公开(公告)日：1999-08-10

    申请号：US710537

    申请日：1996-09-19

    申请人： Paul W. Dent ,  Gregory E. Bottomley

    发明人： Paul W. Dent ,  Gregory E. Bottomley

    IPC分类号： H03M13/41 ,  H01Q1/24 ,  H01Q21/08 ,  H01Q21/28 ,  H03M13/00 ,  H03M13/27 ,  H03M13/35 ,  H03M13/45 ,  H04B7/08 ,  H04B7/10 ,  H04B7/185 ,  H04L1/00 ,  H04L1/06 ,  H04L25/03 ,  H04L25/08 ,  H04L27/00 ,  H04W84/02 ,  H04B1/10 ,  H03M13/22

    CPC分类号： H04L1/0069 ,  H01Q1/246 ,  H01Q21/08 ,  H01Q21/28 ,  H03M13/27 ,  H03M13/35 ,  H03M13/41 ,  H04B7/0851 ,  H04B7/10 ,  H04B7/18515 ,  H04B7/18532 ,  H04B7/18567 ,  H04L1/0048 ,  H04L1/0054 ,  H04L1/007 ,  H04L1/0071 ,  H04L25/03203 ,  H04L25/03331 ,  H04W84/025 ,  H04B7/0837

    摘要： A digital information bit that has been encoded and transmitted as a first modulated signal from a first transmitter in the presence of a second modulated signal that has been transmitted by a second transmitter is received and decoded by receiving a composite signal that is a sum of the first modulated signal and the second modulated signal. The composite signal is processed to generate a complex numerical sample. Then, a plurality of bit pairs are hypothesized, wherein each hypothesized bit pair includes a hypothesized first information bit encoded and transmitted by the first transmitter and a hypothesized second information bit encoded and transmitted by the second transmitter. For each of the plurality of hypothesized bit pairs, a path metric is generated that is indicative of a likelihood that information sequence estimates are accurate estimates, wherein the information sequence estimates include the hypothesized first and second information bits. For each of the plurality of hypothesized bit pairs, the generated path metric is added to a previously determined cumulative path metric to generate a most recent cumulative path metric. An information sequence estimate is selected that has a lowest most recent cumulative path metric, wherein the selected information sequence estimate includes an information sequence estimated to have been encoded and transmitted by the first transmitter and an information sequence estimated to have been encoded and transmitted by the second transmitter.

    摘要翻译： 在存在由第二发送机发送的第二调制信号的情况下，已经被编码并作为来自第一发送机的第一调制信号发送的数字信息比特通过接收和解码，该复合信号是 第一调制信号和第二调制信号。 处理复合信号以产生复数数值样本。 然后，假设多个比特对，其中每个假设的比特对包括由第一发射机编码和发送的假设的第一信息比特和由第二发射机编码和发射的假设的第二信息比特。 对于多个假设比特对中的每一个，生成指示信息序列估计是精确估计的可能性的路径度量，其中信息序列估计包括假定的第一和第二信息比特。 对于多个假设比特对中的每一个，生成的路径量度被加到先前确定的累积路径度量以生成最近的累积路径量度。 选择具有最低最近累积路径量度的信息序列估计，其中所选择的信息序列估计包括被估计为由第一发射机编码和传输的信息序列，以及被估计为由 第二发射机。

    Method and system for demodulation of downlink CDMA signals
    5.
    发明授权
    Method and system for demodulation of downlink CDMA signals 失效
    用于解调下行链路CDMA信号的方法和系统

    公开(公告)号：US5572552A

    公开(公告)日：1996-11-05

    申请号：US187062

    申请日：1994-01-27

    申请人： Paul W. Dent ,  Gregory E. Bottomley

    发明人： Paul W. Dent ,  Gregory E. Bottomley

    IPC分类号： H04B7/08 ,  H03D1/00 ,  H04B1/10

    CPC分类号： H04B1/7097 ,  H04B7/0865

    摘要： Demodulation of a CDMA downlink signal is performed by filtering correlations of the received signal with a known signature sequence. Unlike the conventional RAKE receiver, the filtering is not necessarily a FIR filter with coefficients equal to the conjugates of channel tap estimates. Instead, the present invention filters in such a way as to maximize the output signal-to-noise ratio, accounting for the fact that part of the noise comes from the same base station as the signal, so that it is colored by the same channel as the signal.

    摘要翻译： 通过对接收到的信号与已知签名序列的相关性进行滤波来执行CDMA下行链路信号的解调。 与常规RAKE接收机不同，滤波不一定是具有等于信道抽头估计的共轭的系数的FIR滤波器。 相反，本发明以使得输出信噪比最大化的方式进行滤波，考虑到噪声的一部分来自与信号相同的基站的事实，使得它被相同信道着色 作为信号。

    Method and apparatus for selective demodulation and decoding of communications signals
    6.
    发明授权
    Method and apparatus for selective demodulation and decoding of communications signals 有权
    用于选择性解调和解码通信信号的方法和装置

    公开(公告)号：US07440489B2

    公开(公告)日：2008-10-21

    申请号：US09923374

    申请日：2001-08-07

    申请人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

    发明人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

    IPC分类号： H04K1/00 ,  H04B15/00 ,  H04L27/30

    CPC分类号： H04B1/7115 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/712 ,  H04B2201/7071 ,  H04B2201/709727

    摘要： A spread spectrum signal is processed by correlating the spread spectrum signal with a spreading sequence at a first plurality of correlation times to produce a first plurality of time-offset correlations. The first plurality of time-offset correlations is processed to produce a first symbol representation for a symbol. A first quality is determined for the first symbol representation. Responsive to the determined first quality, it is determined whether to further process the first symbol representation or to process a second symbol representation for the symbol generated from the spread spectrum signal. The first quality may be determined, for example, by decoding the first symbol representations to generate a decoding metric or error check indicator, such as a CRC result. The symbol representations may be generated and/or evaluated for quality in a serial fashion or a parallel fashion.

    摘要翻译： 通过在第一多个相关时间将扩展频谱信号与扩频序列相关来处理扩展频谱信号，以产生第一多个时间偏移相关。 处理第一多个时间偏移相关以产生符号的第一符号表示。 确定第一个符号表示的第一个质量。 响应于确定的第一质量，确定是否进一步处理第一符号表示或处理从扩频信号产生的符号的第二符号表示。 可以例如通过对第一符号表示进行解码以产生诸如CRC结果的解码度量或错误检查指示符来确定第一质量。 符号表示可以以串行方式或并行方式生成和/或评估质量。

    Despreading of direct sequence spread spectrum communications signals
    7.
    发明授权
    Despreading of direct sequence spread spectrum communications signals 失效
    直接序列扩频通信信号的解扩

    公开(公告)号：US6005887A

    公开(公告)日：1999-12-21

    申请号：US748755

    申请日：1996-11-14

    申请人： Gregory E. Bottomley ,  Rajaram Ramesh ,  Paul W. Dent ,  Sandeep Chennakeshu

    发明人： Gregory E. Bottomley ,  Rajaram Ramesh ,  Paul W. Dent ,  Sandeep Chennakeshu

    IPC分类号： H04B7/26 ,  H04B1/707 ,  H04B1/709 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

    CPC分类号： H04B1/709 ,  H04B1/707

    摘要： The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.

    摘要翻译： 本公开提出了用于解扩直接序列扩频通信信号的许多降低的复杂度架构。 在用于序列去除单元的第一解扩架构中，根据复扩展序列的处理相位，接收的码片间隔复数样本被否定。 此外，同相和正交相位采样值根据处理相位彼此切换。 在第二解扩架构中，在序列去除单元中，在对数域中处理接收的码片间隔复数样本，其中复扩展序列的相位被加到检测相位，并且所得到的复信号然后转换回笛卡尔坐标 。 在用于相关器的第三解扩架构中，在对数域中执行序列去除和相关，其中所得复数信号的幅度和相位被算术平均，然后转换回笛卡尔坐标。 用于相关器的架构，使用循环平均在对数域中执行序列去除和相关。 在用于相关器的第五解扩架构中，其中将多个分量序列组合在一起以形成整个序列，并且其中所述多个分量序列之一由所有信道共享，提供共同的序列去除以从 所有频道 然后将所得到的信号发送到多个单独的相关器，以去除信道特定序列。

    Multiple access coding for radio communications
    8.
    发明授权
    Multiple access coding for radio communications 失效
    无线电通信的多址接入编码

    公开(公告)号：US5771288A

    公开(公告)日：1998-06-23

    申请号：US799590

    申请日：1997-02-10

    申请人： Paul W. Dent ,  Gregory E. Bottomley

    发明人： Paul W. Dent ,  Gregory E. Bottomley

    IPC分类号： H04Q7/38 ,  H01J13/00 ,  H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04J13/12 ,  H04J13/16 ,  H04L1/00 ,  H04L1/02 ,  H04L9/00 ,  H04L9/18

    CPC分类号： H04L1/0057 ,  H04B1/707 ,  H04J13/00 ,  H04J13/0048 ,  H04J13/12 ,  H04J13/004 ,  H04J13/16 ,  H04L2209/04 ,  H04L2209/34

    摘要： Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation properties. The set of scrambling masks is selected such that the correlation between the modulo-2 sum of two masks with any codeword in the block code is a constant magnitude, independent of the mask set and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scrambling masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.

    摘要翻译： 对具有公共块纠错码编码的个别信息信号被分配从具有所选相关特性的一组加扰掩码中获得的唯一加密掩码或签名序列。 选择这组加扰掩码，使得两个掩模的模2之和与块码中的任何码字之间的相关性是恒定的幅度，与掩模集合和被比较的各个掩码无关。 在一个实施例中，当使用模2算术对任何两个掩模求和时，该和的沃尔什变换导致最大平均沃尔什频谱。 对于使用减法CDMA解调技术的蜂窝无线电话系统，双层加密系统通过使用伪随机生成的代码密钥来选择蜂窝系统级别中的安全性，以选择特定小区中所有移动台公共的加扰掩码之一。 此外，通过在加扰操作之前使用伪随机生成的加密密钥来加密各个信息信号来确保个人移动用户级别的隐私。

    Baseband processor with look-ahead parameter estimation capabilities
    9.
    发明授权
    Baseband processor with look-ahead parameter estimation capabilities 有权
    具有先行参数估计功能的基带处理器

    公开(公告)号：US06570910B1

    公开(公告)日：2003-05-27

    申请号：US09426374

    申请日：1999-10-25

    申请人： Gregory E. Bottomley ,  Paul W. Dent ,  Ross W. Lampe

    发明人： Gregory E. Bottomley ,  Paul W. Dent ,  Ross W. Lampe

    IPC分类号： H04B166

    CPC分类号： H04L25/03337 ,  H03M13/39 ,  H04B17/26 ,  H04B17/318 ,  H04B17/373 ,  H04L1/0054 ,  H04L25/0212 ,  H04L25/025

    摘要： In a receiver for receiving data samples including a sequence of symbol values transmitted across the channel, a baseband processor including a first hypothesize unit developing first sets of hypothetical symbol values, a second hypothesize unit developing second sets of hypothetical symbol values different from the first sets, a parameter estimator receiving the received data samples and the first and second sets of hypothetical symbol values and developing parameter estimates based thereon, and a sequence estimator receiving the developed parameter estimates, the first sets of hypothetical symbol values and a delayed version of the received data samples and developing a sequence of detected symbol values related to the received data samples.

    摘要翻译： 在用于接收数据样本的接收机中，包括通过所述信道发送的符号值序列的基带处理器，包括第一假设单元，其形成第一组假设符号值;第二假设单元，形成与所述第一组不同的第二组假设符号值 接收接收到的数据样本的参数估计器以及基于其的开发参数估计的第一和第二组假设符号值以及接收所开发的参数估计的序列估计器，所接收的第一组假设符号值和延迟版本 数据样本并开发与接收的数据样本相关的检测符号值的序列。