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218 条记录 (耗时 0.018 秒)

    DIRECT SEQUENCE SPREAD SPECTRUM DSP SYSTEM
    61.
    发明公开
    DIRECT SEQUENCE SPREAD SPECTRUM DSP SYSTEM 失效
    直接序列扩频DSP系统

    公开(公告)号：EP0865687A4

    公开(公告)日：2003-05-28

    申请号：EP96943509

    申请日：1996-11-15

    申请人： AXONN L L C

    发明人： SANDERFORD H BRITTON ,  ROUQUETTE ROBERT E ,  NADEN GARY A

    IPC分类号： H04B1/707

    CPC分类号： H04B1/70752 ,  H04B1/707 ,  H04B1/70755 ,  H04B1/70775 ,  H04B1/708 ,  H04B1/7097 ,  H04B1/7101

    摘要： A direct sequence spread spectrum (DSSP) DSP implementation technique utilizing a unique combination of multiple filters (DSP Channel Fltr), transforms, despreading algorithm and spectral compression, all in a single coefficient set, providing a highly efficient system. Reallocatable computational resources allow for frequency uncertainty in the transmitter, without the typical excessive noise bandwidth penalties. The present system further contemplates a unique energy detection algorithm for discerning spread spectrum while in the search mode, utilizing discrete sampling data sets to increase signal strength, reducing noise, while changing the relative phase of the received chipping code with respect to the received signal. The spectral compression of the spreading sequence is achieved by representing the PRC as an array of two, complementing fractional coefficients. The PRC code is filtered to achieve the required spectral compression characteristics, resulting in minimal despreading loss, while providing interference rejection of CW signals greater than 1.5 MHz from the center IF frequency.

    MATCHED FILTER USING TIME-MULTIPLEXED PRECOMBINATIONS
    64.
    发明公开
    MATCHED FILTER USING TIME-MULTIPLEXED PRECOMBINATIONS 有权
    信号匹配滤波器使用受控的组合，时间复用方法

    公开(公告)号：EP1195007A1

    公开(公告)日：2002-04-10

    申请号：EP00938161.7

    申请日：2000-06-07

    申请人： ERICSSON INC.

    发明人： DENT, Paul, W. ,  ROBERTS, Clarence, V.

    IPC分类号： H03H17/02

    CPC分类号： G06F17/15 ,  H03H17/0254 ,  H04B1/70751 ,  H04B1/70752 ,  H04B1/7093 ,  H04B2201/70707

    摘要： A technique for correlating a stream of signal sample values with a predetermined binary code having a plurality of binary code bits is disclosed. The technique is realized by forming precombinations of groups of the signal sample values in the stream, and then temporally ordering the precombinations. Particular ones of the temporally ordered precombinations are selected based upon particular combinations of the plurality of binary code bits. The particular selected ones of the temporally ordered precombinations are then combined to form a correlation.

    METHOD AND APPARATUS FOR FAST WCDMA ACQUISITION
    65.
    发明公开
    METHOD AND APPARATUS FOR FAST WCDMA ACQUISITION 有权
    方法和设备快速W-CDMA收购

    公开(公告)号：EP1192728A1

    公开(公告)日：2002-04-03

    申请号：EP00946893.5

    申请日：2000-06-28

    申请人： QUALCOMM Incorporated

    发明人： SARKAR, Sandip

    IPC分类号： H04B1/707

    CPC分类号： H04B1/70752 ,  H04B1/70735 ,  H04B1/70755 ,  H04B1/708 ,  H04B1/7083 ,  H04B2201/70701 ,  H04B2201/70707

    摘要： A method and apparatus for quickly acquiring synchronization of a signal in WCDMA communication system utilizing variable duration sample accumulation, validity testing of decoder estimates, and parallel decoding of multiple synchronization signals within a PERCH channel. The receiver (204) accumulates the samples necessary to reliably determine slot timing. Until slot timing estimates pass a validity test, samples are accumulated (304A, 304B) for frame timing estimates. Until frame timing estimates pass a validity test, samples are analyzed to determine the pilot offset of the channel.

    REDUCED POWER MATCHED FILTER
    67.
    发明公开
    REDUCED POWER MATCHED FILTER 审中-公开
    省电信号的自适应滤波

    公开(公告)号：EP1133739A1

    公开(公告)日：2001-09-19

    申请号：EP99956632.6

    申请日：1999-10-21

    申请人： Ericsson Inc.

    发明人： DENT, Paul ,  URABE, Kenzo

    IPC分类号： G06F17/15

    CPC分类号： H04B1/70752 ,  G06F17/15 ,  H04B1/70751 ,  H04B1/7093 ,  H04B1/7095 ,  H04B2201/70707

    摘要： A matched filter for use in a radio telephone receiver that receives Code Division Multiple Access (CDMA) signals. The matched filter produces precombinations of input values to significantly reduce the number of multiplication and addition operations, compared to conventional matched filters, required to produce a correlation value. This reduced number of required operations, along with a reduced number of delay elements required to despread CDMA signals, significantly reduces the overall power consumption of the matched filter. The use of such a matched filter in a device like a cellular phone, for example, would thus lead to longer battery life.

    COMBINED SEARCHING AND PAGE MONITORING USING OFFLINE SAMPLE STORAGE
    68.
    发明公开
    COMBINED SEARCHING AND PAGE MONITORING USING OFFLINE SAMPLE STORAGE 有权
    联合搜索和Funkrufüberwachung手套离线存储的样本

    公开(公告)号：EP1121766A1

    公开(公告)日：2001-08-08

    申请号：EP99954884.5

    申请日：1999-10-12

    申请人： QUALCOMM Incorporated

    发明人： BUTLER, Brian, K. ,  ZHANG, Haitao ,  TIEDEMANN, Edward, G., Jr.

    IPC分类号： H04B1/707 ,  H04Q7/32

    CPC分类号： H04B1/70752 ,  H04B1/707 ,  H04B1/70775 ,  H04B1/7097 ,  H04B2201/70701 ,  H04B2201/70707 ,  H04W68/025

    摘要： A novel and improved method for performing paging is described. In one embodiment of the invention a searcher is used to detect spread spectrum signals. Samples received RF signals are stored in a sample buffer. During standby mode, the samples are gathered during paging slots assigned to the mobile. A set of searches are performed on the samples, and if pilot signals are detected additional demodulation is performed to detect paging messages. The resulting set of demodulation data may be combined to increase detection. After a page message has been detected, additional demodulation resources may be activated to processes more complete page messages, or other information channels. In one embodiment of the invention, the searcher includes a demodulator to perform quick page detection without the use of finger elements to reduce idle mode power consumption.

    Fractional sample timing error estimation for W-CDMA
    69.
    发明公开
    Fractional sample timing error estimation for W-CDMA 审中-公开
    Taktfehlerschätzungbei schrittweisem Abtastenfürbreitbandiges CDMA

    公开(公告)号：EP1089452A1

    公开(公告)日：2001-04-04

    申请号：EP99307636.3

    申请日：1999-09-28

    申请人： LUCENT TECHNOLOGIES INC.

    发明人： Freiberg, Lorenze Fred ,  Sabel, Lesley Phillip ,  Wood, Steven Andrew

    IPC分类号： H04B1/707

    CPC分类号： H04B1/70752 ,  H04B1/70757 ,  H04B1/7117

    摘要： There is disclosed a method of estimating the timing error of a received signal in a spread spectrum communication system comprising: cross-correlating a portion of the received signal with a known sequence thereby generating a sampled cross-correlation function; determining the sample having the highest value of the sampled cross-correlation function; and estimating the timing position of the actual peak of the cross-correlation function based on the sample point peak value of the sampled cross-correlation function and the values of the cross-correlation function at sample points before and after the sample generating the peak value.

    摘要翻译： 公开了一种在扩频通信系统中估计接收信号的定时误差的方法，包括：将已接收信号的一部分与已知序列相互相关，从而产生采样的互相关函数; 确定具有最高采样互相关函数值的样本; 以及基于采样互相关函数的采样点峰值和在生成峰值的采样之前和之后的采样点处的互相关函数的值来估计互相关函数的实际峰值的定时位置 。

    RAKE receiver
    70.
    发明公开
    RAKE receiver 审中-公开
    RAKE-Empfänger

    公开(公告)号：EP1067700A2

    公开(公告)日：2001-01-10

    申请号：EP00114015.1

    申请日：2000-07-04

    申请人： NEC CORPORATION

    发明人： Tamura, Koichi

    IPC分类号： H04B1/707

    CPC分类号： H04B1/7113 ,  H04B1/70752 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70707

    摘要： A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, includes a delay profile calculating section and a finger path allocating section. The delay profile calculating section calculates a delay profile using a reception signal. The finger path allocating section allocates path positions to the plurality of fingers on the basis of the delay profile calculated by the delay profile calculating section. A delay profile calculation cycle in the delay profile calculating section is variable. A power consumption control method is also disclosed.

    摘要翻译： 在CDMA通信系统中使用的无线通信装置具有多个指状物，并且执行前置接收，包括延迟分布计算部分和手指路径分配部分。 延迟分布计算部分使用接收信号来计算延迟分布。 手指路径分配单元基于由延迟分布计算部分计算出的延迟分布，将路径位置分配给多个手指。 延迟分布计算部分中的延迟分布计算周期是可变的。 还公开了一种功耗控制方法。