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116 条记录 (耗时 0.023 秒)

    METHOD AND APPARATUS FOR SELECTING DEMODULATION PROCESSING DELAYS IN A RECEIVER
    23.
    发明公开
    METHOD AND APPARATUS FOR SELECTING DEMODULATION PROCESSING DELAYS IN A RECEIVER 审中-公开
    方法和设备处理延迟解调接收器选择

    公开(公告)号：EP2005610A1

    公开(公告)日：2008-12-24

    申请号：EP06724501.9

    申请日：2006-04-21

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： CAIRNS, Douglas, A. ,  BOTTOMLEY, Gregory, E.

    IPC分类号： H04B1/707

    CPC分类号： H04L25/03044 ,  H04B1/7117 ,  H04B1/712 ,  H04B2201/70707 ,  H04B2201/709727 ,  H04L2025/03477 ,  H04L2025/03515

    摘要： A receiver includes a baseband processor for selecting a set of demodulation processing delays for received signal demodulation from a larger set of candidate delays. In one embodiment, the baseband processor selects the set of demodulation processing delays by calculating at least one metric for each demodulation processing delay in the set of candidate delays, iteratively reducing the set of candidate delays by eliminating one or more demodulation processing delays from the set as a function of comparing the metrics, and setting the processing delays for received signal demodulation to the candidate delays remaining after reduction. In a Generalized RAKE (G-RAKE) embodiment, the metric corresponds to combining weight magnitudes associated with G-RAKE finger delays. In a chip equalizer embodiment, the metric corresponds to coefficient magnitudes associated with equalization filter tap delays. In other embodiments, the metric corresponds to Signal to Interference Ratios (SIRs) associated with the set of candidate delays.

    DATA TRANSMITTING METHOD AND DATA TRANSMITTING APPARATUS
    24.
    发明公开
    DATA TRANSMITTING METHOD AND DATA TRANSMITTING APPARATUS 审中-公开
    VERFAHREN UND VORRICHTUNG ZUM SENDEN VON DATEN

    公开(公告)号：EP1988675A1

    公开(公告)日：2008-11-05

    申请号：EP07708342.6

    申请日：2007-02-13

    申请人： National Institute of Advanced Industrial Science and Technology

    发明人： SATO, Yoichi ,  HIGUCHI, Tetsuya ,  MURAKAWA, Masahiro

    IPC分类号： H04L27/00

    CPC分类号： H04L25/03044 ,  H04L27/38

    摘要： A serial-parallel converter/encoder unit 11 inputs a transmission symbol data at a transmission symbol rate that is one-Nth of a base-point symbol rate. A precoder/collator 13 creates a transmission symbol waveform at the base-point symbol rate. The transmission symbol waveform becomes a transmission signal after passing through a roll-off filter 14 with a band corresponding to the base-point symbol rate and a modulator 15. A reception signal demodulated by a demodulator 33 is input to a fractionally-spaced equalizer 38 that operates at the base-point symbol rate and is forcibly equalized at the transmission symbol rate by using a reference signal. A level of a signal output from the fractionally-spaced equalizer 38 at the transmission symbol rate is determined by a level determining unit 39 and becomes a reception symbol data by a sawtooth-function output unit 40.

    摘要翻译： 串行并行转换器/编码器单元11以基点符号率的九分之一的传输符号速率输入传输符号数据。 预编码器/整理器13以基点符号率创建发送符号波形。 发送符号波形在通过具有与基点符号率对应的频带的滚降滤波器14和调制器15之后成为发送信号。由解调器33解调的接收信号被输入到分数间隔的均衡器38 其以基点符号速率运行，并且通过使用参考信号以传输符号速率强制均衡。 由等级间隔均衡器38以传输符号速率输出的信号电平由电平确定单元39确定，并由锯齿波函数输出单元40变成接收符号数据。

    EQUALIZER FOR A RECEIVER IN A WIRELESS COMMUNICATION SYSTEM
    25.
    发明公开
    EQUALIZER FOR A RECEIVER IN A WIRELESS COMMUNICATION SYSTEM 有权
    均衡器的接收器无线通信系统

    公开(公告)号：EP1949628A2

    公开(公告)日：2008-07-30

    申请号：EP06839904.7

    申请日：2006-11-15

    申请人： QUALCOMM Incorporated

    发明人： MERGEN, Gokhan ,  SUBRAHMANYA, Parvathanathan ,  KASTURI, Nitin ,  SUNDARESAN, Rajesh

    IPC分类号： H04L25/03

    CPC分类号： H04B7/0634 ,  H04B7/0848 ,  H04L7/0058 ,  H04L25/03044

    摘要： Techniques for performing equalization at a receiver are described. In an aspect, equalization is performed by sub-sampling an over-sampled input signal to obtain multiple sub-sampled signals. An over-sampled channel impulse response estimate is derived and sub-sampled to obtain multiple sub-sampled channel impulse response estimates. At least one set of equalizer coefficients is derived based on at least one sub-sampled channel impulse response estimate. At least one sub-sampled signal is filtered with the at least one set of equalizer coefficients to obtain at least one output signal. One sub-sampled signal (e.g., with largest energy) may be selected and equalized based on a set of equalizer coefficients derived from an associated sub-sampled channel impulse response estimate. Alternatively, the multiple sub-sampled signals may be equalized based on multiple sets of equalizer coefficients, which may be derived separately or jointly. The equalizer coefficients may be derived in the time domain or frequency domain.

    FRACTIONALLY-SPACED EQUALIZERS FOR SPREAD SPECTRUM WIRELESS COMMUNICATION
    26.
    发明公开
    FRACTIONALLY-SPACED EQUALIZERS FOR SPREAD SPECTRUM WIRELESS COMMUNICATION 审中-公开
    ANTEILMÄSSIGBEABSTANDETE AUSGLEICHERFÜRDRAHTLOSE SPREIZSPEKTRUMKOMMUNIKATION

    公开(公告)号：EP1925096A1

    公开(公告)日：2008-05-28

    申请号：EP06803719.1

    申请日：2006-09-15

    申请人： Qualcomm Incorporated

    发明人： SUBRAHMANYA, Parvathanathan ,  KANG, Inyup ,  FEI, Jia ,  SUNDARESAN, Rajesh

    IPC分类号： H04B1/707 ,  H04B7/08 ,  H04L25/03

    CPC分类号： H04B1/71057 ,  H04B7/0669 ,  H04B7/0673 ,  H04B7/0845 ,  H04L25/03044 ,  H04L25/03292 ,  H04L2025/03509

    摘要： This disclosure describes equalization techniques for spread spectrum wireless communication. The techniques may involve estimating a channel impulse response, estimating channel variance, and selecting filter coefficients for an equalizer based on the estimated channel impulse response and the estimated channel variance. Moreover, in accordance with this disclosure, the channel variance estimation involves estimation of two or more co-variances for different received samples. Importantly, the equalizer is “fractionally spaced,” which means that the equalizer defines fractional filtering coefficients (filter taps), unlike conventional equalizers that presume that filter coefficients are defined at integer chip spacing. The techniques can allow the equalizer to account for antenna diversity, such as receive diversity, transmit diversity, or possibly both.

    摘要翻译： 本公开描述了用于扩频无线通信的均衡技术。 这些技术可以包括基于估计的信道脉冲响应和估计的信道方差来估计信道脉冲响应，估计信道方差，以及为均衡器选择滤波器系数。 此外，根据本公开，信道方差估计涉及对于不同接收样本的两个或多个协方差的估计。 重要的是，均衡器是“分数间隔”的，这意味着均衡器定义了分数滤波系数（滤波器抽头），不同于传统的均衡器，假设滤波器系数是以整数芯片间隔定义的。 这些技术可以允许均衡器考虑天线分集，例如接收分集，发射分集，或者可能两者。

    Method and apparatus for time equalization
    28.
    发明公开
    Method and apparatus for time equalization 审中-公开
    Verfahren und Vorrichtung zur Zeitentzerrung

    公开(公告)号：EP1835651A2

    公开(公告)日：2007-09-19

    申请号：EP07012931.7

    申请日：2000-12-04

    申请人： Fujitsu Ltd.

    发明人： Kaku, Takashi Fujitsu Ltd. ,  Murata, Hiroyasu Fujitsu Ltd. ,  Miyazawa, Hideo Fujitsu Ltd.

    IPC分类号： H04L7/04 ,  H04L7/027 ,  H04J11/00 ,  H04L27/26 ,  H04L25/03

    CPC分类号： H04L27/2602 ,  H04L25/03044 ,  H04L27/2655 ,  H04L27/2662 ,  H04L27/2676 ,  H04L2025/03477

    摘要： Timing phase information is extracted from a power spectrum of a received signal whose amplitude is modulated per frame or sub-frame, and timing phase synchronization of the received signal is performed with the timing phase information. Also, a vector signal of the power spectrum is generated, the vector signal is multiplied by another vector signal to be rotated, a sign decision of the rotated vector signal is performed, a result of the sign decision is integrated to be outputted as the timing phase information, and a vector conversion is performed to the integrated value to be fed back as the other vector signal.

    摘要翻译： 从幅度调制每帧或子帧的接收信号的功率谱提取定时相位信息，并且利用定时相位信息执行接收信号的定时相位同步。 此外，产生功率谱的矢量信号，将矢量信号乘以要旋转的另一矢量信号，执行旋转矢量信号的符号判定，将积分判定结果作为定时输出 执行向反馈的积分值作为其他矢量信号的向量变换。