利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

159 条记录 (耗时 0.029 秒)

    Pseudorandom number sequence generation in radiocommunication systems
    81.
    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。

    Interference mitigation by joint decoding of overlapped signals
    84.
    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 apparatus for spread spectrum channel estimation
    86.
    发明授权
    Method and apparatus for spread spectrum channel estimation 失效
    扩频通道估计的方法和装置

    公开(公告)号：US5677930A

    公开(公告)日：1997-10-14

    申请号：US504339

    申请日：1995-07-19

    申请人： Gregory E. Bottomley

    发明人： Gregory E. Bottomley

    IPC分类号： H04B1/7105 ,  H04B7/26 ,  H04B1/707

    CPC分类号： H04B1/71052

    摘要： Methods and systems for receiving signals in spread spectrum communications are described. In CDMA systems, for example, signature sequences used to generate correlations with received signals may not have ideal autocorrelation properties. In such cases, the correlations determined by the receiver may include errors which are propagated through channel tap estimates to the demodulated and decoded information symbols. To reduce or eliminate such self-interference or inter-ray interference, the correlations are decorrelated by, for example, matrix multiplying them with values related to values of the autocorrelation function for the signature sequence of interest.

    摘要翻译： 描述了用于在扩频通信中接收信号的方法和系统。 在CDMA系统中，例如，用于产生与接收信号的相关性的签名序列可能不具有理想的自相关特性。 在这种情况下，由接收机确定的相关性可以包括通过信道抽头估计传播到经解调和解码的信息符号的错误。 为了减少或消除这种自干扰或射线间干扰，相关性通过例如将它们与与感兴趣的签名序列的自相关函数的值相关的值进行解相关。

    System and method for joint demodulation of CDMA signals
    87.
    发明授权
    System and method for joint demodulation of CDMA signals 失效
    CDMA信号联合解调的​​系统和方法

    公开(公告)号：US5506861A

    公开(公告)日：1996-04-09

    申请号：US155557

    申请日：1993-11-22

    申请人： Gregory E. Bottomley

    发明人： Gregory E. Bottomley

    IPC分类号： H04B1/711 ,  H04B7/216 ,  H04K1/10

    CPC分类号： H04L25/03331 ,  H04B1/711 ,  H04B7/216 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0222

    摘要： Methods and systems for jointly demodulating CDMA signals are presented. The disclosed methods and systems provide, among other advantages, for accurate demodulation of such signals in multipath, time-dispersion environments. Single signal or multiple signal demodulation, with or without taking intersymbol interference into account can be accomplished according to the present invention.

    摘要翻译： 提出了用于联合解调CDMA信号的方法和系统。 除了其他优点之外，所公开的方法和系统还提供了用于在多径，时间 - 分散环境中的这种信号的精确解调。 根据本发明可以实现考虑到或不考虑符号间干扰的单信号或多信号解调。

    Rake receiver with selective ray combining
    88.
    发明授权
    Rake receiver with selective ray combining 失效
    RAKE接收器与选择性RAY组合

    公开(公告)号：US5237586A

    公开(公告)日：1993-08-17

    申请号：US857433

    申请日：1992-03-25

    申请人： Gregory E. Bottomley

    发明人： Gregory E. Bottomley

    IPC分类号： H04B1/00 ,  H04B1/10 ,  H04B1/709 ,  H04B1/7115 ,  H04B1/7117 ,  H04B1/712

    CPC分类号： H04B1/7115 ,  H04B1/709 ,  H04B1/7117 ,  H04B1/712

    摘要： A modified RAKE receiver, referred to as a WRAKE receiver, is used in CDMA communications. It is particularly adaptable to a subtractive CDMA system. The receiver includes a radio receiver for receiving and demodulating a composite signal of overlapping transmitted signals (spread signals), a sampler to sample the received signals, a selector for selecting different groups of samples, a correlator for correlating the samples with known despreading codes and a comparator to determine the symbol transmitted. The receiver also includes a combiner which combines either different groups of samples together or combines different correlation values together. The sample groups selected are channel independent and combine data received from different time shifts. Likewise, the sample groups for each channel and the correlation values are time-of-arrival independent.

    Method and apparatus for detecting a plurality of symbol blocks using a decoder
    89.
    发明授权
    Method and apparatus for detecting a plurality of symbol blocks using a decoder 有权
    用于使用解码器检测多个符号块的方法和装置

    公开(公告)号：US08630372B2

    公开(公告)日：2014-01-14

    申请号：US13594191

    申请日：2012-08-24

    申请人： Stephen Grant ,  Gregory E. Bottomley ,  Florent Munier

    发明人： Stephen Grant ,  Gregory E. Bottomley ,  Florent Munier

    IPC分类号： H04L27/06 ,  H04L27/14

    CPC分类号： H04L25/03286 ,  H04L25/03178 ,  H04L25/03331 ,  H04L2025/03426

    摘要： Teachings presented herein offer a technique for using a demodulator to improve a demodulation process. For example, a demodulation unit according to an embodiment of the present invention may be a multi-stage demodulator and may include: a demodulator configured to receive a baseband signal and configured to produce modem bit likelihood values based on the received baseband signal; a decoder configured to receive and process the modem bit likelihood values to produce improved modem bit likelihood values; a candidate value generator configured to produce, based on the improved modem bit likelihood values, candidate symbol values for a group of one or more symbols; and a detector configured to receive the baseband signal and the candidate symbol values and configured to produce one of (a) final modem bit estimates and (b) candidate symbol values for a group of symbols.

    摘要翻译： 本文提出的教学提供了一种使用解调器来改进解调过程的技术。 例如，根据本发明的实施例的解调单元可以是多级解调器，并且可以包括：解调器，被配置为接收基带信号并被配置为基于接收到的基带信号产生调制解调器比特似然值; 解码器，被配置为接收和处理调制解调器比特似然值以产生改进的调制解调器比特似然值; 候选值生成器，被配置为基于改进的调制解调器比特似然值产生一个或多个符号的组的候选符号值; 以及检测器，被配置为接收基带信号和候选符号值，并且被配置为产生（a）最终调制解调器比特估计和（b）一组符号的候选符号值中的一个。

    Method and apparatus for symbol detection via reduced complexity sequence estimation processing
    90.
    发明授权
    Method and apparatus for symbol detection via reduced complexity sequence estimation processing 有权
    通过降低复杂度序列估计处理的符号检测方法和装置

    公开(公告)号：US08559561B2

    公开(公告)日：2013-10-15

    申请号：US12035932

    申请日：2008-02-22

    申请人： Gregory E. Bottomley

    发明人： Gregory E. Bottomley

    IPC分类号： H04L27/00

    CPC分类号： H04L25/03292

    摘要： Teachings presented herein offer the performance advantages of sequence estimation for received signal symbol detection, while simultaneously providing potentially significant reductions in computational overhead. Initial demodulation of a received signal identifies a reduced number of candidate symbol values for all or a subset of a sequence of symbols represented in a received signal. A sequence estimation process, e.g., an MLSE process, constrains its state spaces to the reduced number of candidate symbols values, rather than considering all possible symbol values.

    摘要翻译： 本文提供的教学提供了接收信号符号检测的序列估计的性能优势，同时提供潜在的显着降低计算开销。 接收信号的初始解调识别在接收信号中表示的符号序列的全部或子集的候选符号值的减少数量。 序列估计过程，例如MLSE过程，将其状态空间限制为减少的候选符号值的数量，而不是考虑所有可能的符号值。