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176 条记录 (耗时 0.012 秒)

    Carrier and symbol synchronisation for 8-DPSK signals
    82.
    发明公开
    Carrier and symbol synchronisation for 8-DPSK signals 审中-公开
    8-DPSK信号载波和符号时钟同步

    公开(公告)号：EP1128621A3

    公开(公告)日：2004-01-02

    申请号：EP01102125.0

    申请日：2001-01-31

    申请人： Northrop Grumman Corporation

    发明人： Myers, Michael H.

    IPC分类号： H04L27/233 ,  H04L7/04

    CPC分类号： H04L27/233 ,  H04L2027/003 ,  H04L2027/0036 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0095

    摘要： A radio receiver (10) processes a carrier signal having a Doppler shifted frequency and carrying a coded signal having variable phase and amplitude. The coded signal is divided into a preamble portion and a message portion. A memory (23) stores samples of the coded signal representing at least some of the predetermined symbols of the preamble. A logic unit (16) divides the stored samples into a plurality of sample groups and identifies one sample group having the minimum variation of envelope amplitude. That sample group is used to provide additional samples by which the Doppler shift of the carrier frequency is estimated (70). The coded signal is delayed by a delay operation (100) and has its Doppler shift reduced. The Doppler reduced coded signal is processed by a filter operation (120) and a demodulator (130).

    Frequency offset correction circuit for WCDMA
    83.
    发明公开
    Frequency offset correction circuit for WCDMA 有权
    WCDMA的频偏校正电路

    公开(公告)号：EP1289163A3

    公开(公告)日：2003-05-28

    申请号：EP02255941.3

    申请日：2002-08-27

    申请人： Broadcom Corporation

    发明人： Chang, Li Fung ,  Yang, Baoguo ,  Sollenberger, Nelson

    IPC分类号： H04B1/707 ,  H04L27/00 ,  H04B7/26

    CPC分类号： H04B1/7075 ,  H04B1/70735 ,  H04B1/708 ,  H04L2027/0046

    摘要： Methods and apparatus for acquiring and verifying a code used by a base station. Acquisition time is reduced and circuitry simplified by performing Phase I (320) and Phase II (330) acquisitions in series, but in parallel with Phase III acquisition (340) and verification (350), which are done in series. Phase III code acquisition (340) is done by despreading the input signal using each of the possible codes in a code group. An estimation of the frequency offset between the base station and the terminal's local reference is used to correct the phase of the despread signals, which are coherently and non-coherently integrated. The largest accumulated value corresponds to the code used by the base station. The code is verified by despreading (380) the received signal, applying a frequency correction (360), and demodulating. The demodulated output is a series of symbols, and a count of these symbols verifies the acquired code.

    摘要翻译： 用于获取和验证由基站使用的代码的方法和设备。 通过串行执行阶段I（320）和阶段II（330）采集，但与串联完成的阶段III采集（340）和验证（350）并行地执行阶段I（320）和阶段II（330），缩短采集时间并简化电路。 阶段III代码获取（340）通过使用代码组中的每个可能的代码对输入信号进行解扩来完成。 使用基站和终端本地参考之间频率偏移的估计来校正相干和非相干积分的解扩信号的相位。 最大累计值对应于基站使用的编码。 通过解扩（380）接收到的信号，应用频率校正（360）和解调来验证该码。 解调输出是一系列符号，并且这些符号的计数验证所获取的代码。

    CDMA despreading using QPSK rotated PN sequences
    84.
    发明公开
    CDMA despreading using QPSK rotated PN sequences 审中-公开
    使用CDMA信号的解扩QPSK调制和旋转PN序列

    公开(公告)号：EP1296461A2

    公开(公告)日：2003-03-26

    申请号：EP02102086.2

    申请日：2002-08-01

    申请人： Texas Instruments Incorporated

    发明人： Sriram, Sundarajan

    IPC分类号： H04B1/707

    CPC分类号： H04B1/707 ,  H04B1/709 ,  H04B2201/70707 ,  H04L27/20 ,  H04L2027/0028 ,  H04L2027/0046

    摘要： Pseudo-noise code modulated QPSK signals are correlated with a rotated version of the conjugate pseudo-noise code to lessen computational complexity. The rotation emulates a phase shift in the transmission channel, and the rotation is removed without computation by channel estimation.

    摘要翻译： 伪噪声码调制的QPSK信号用的旋转形式的缀合物的伪噪声码，以减小计算复杂度相关。 旋转模拟在传输信道的相移，旋转，而不通过信道估计计算中移除。

    RADIO COMMUNICATION TERMINAL CAPABLE OF SPECIFYING BURST POSITION ACCURATELY AND HAVING SMALL FREQUENCY ERROR OF REGENERATIVE CARRIER WAVE
    86.
    发明公开
    RADIO COMMUNICATION TERMINAL CAPABLE OF SPECIFYING BURST POSITION ACCURATELY AND HAVING SMALL FREQUENCY ERROR OF REGENERATIVE CARRIER WAVE 审中-公开
    RADIO切换端子，THE BUNSTPOSITION适用于集可以，和低频再生载波波GESITZT偏移

    公开(公告)号：EP1168745A1

    公开(公告)日：2002-01-02

    申请号：EP99974201.8

    申请日：1999-11-12

    申请人： MITSUBISHI DENKI KABUSHIKI KAISHA ,  Doi, Masayuki

    发明人： DOI, Masayuki

    IPC分类号： H04L27/22

    CPC分类号： H04L27/2332 ,  H04L27/16 ,  H04L2027/0046 ,  H04L2027/0065

    摘要： A power calculator (19) calculates the power of an input signal in accordance with a component of an input received signal (I, Q). A comparator (20) asserts an unmodulated signal detection signal when the power calculated by the power calculator exceeds a prescribed threshold. A maximum value detector (41) detects the maximum power of the input received signal in accordance with the assertion of the unmodulated signal detection signal and generates non-modulated signal position instruction information with a maximum value detection signal, and a frequency error calculator (42; 42, 50, 60, 70) calculates an error of a carrier frequency on the basis of the received signal corresponding to the maximum power. The frequency error is calculated only with a non-modulated signal, whereby the frequency error can be correctly calculated and the non-modulated signal position can also be correctly detected.

    摘要翻译： 功率计算器（19）计算雅舞蹈的输入信号的功率与输入的接收信号（I，Q）的一个组件。 比较器（20）断言到未调制信号的检测信号。当由功率计算器计算的功率超过预定阈值。 最大值检测器（41），检测输入的最大功率的接收信号在雅舞的未调制的信号的检测信号的判断和生成率与最大值检测信号的非调制信号的位置指令信息，以及频率误差计算器（42 ; 42，50，60，70）计算对应于最大功率的接收信号的基础上的载波频率的误差。 频率误差仅与一个非调制信号，由此，频率误差可以被正确地计算和非调制信号的位置，因此可以正确地检测计算。

    APPARATUS AND METHOD FOR BLOCK PHASE ESTIMATION
    89.
    发明公开
    APPARATUS AND METHOD FOR BLOCK PHASE ESTIMATION 失效
    装置和方法估算相

    公开(公告)号：EP1012966A2

    公开(公告)日：2000-06-28

    申请号：EP97947437.6

    申请日：1997-11-10

    申请人： SCIENTIFIC-ATLANTA, INC.

    发明人： MONTREUIL, Leo

    IPC分类号： H03D3/00

    CPC分类号： H04L27/2332 ,  H03D3/006 ,  H03D3/007 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0067 ,  H04L2027/0069

    摘要： A block phase estimator (102) includes a phase averaging circuit (80). A first embodiment of the phase averaging circuit (80) includes a phase differencing circuit (82) coupled to an averager input (80), a first modulo circuit (84) coupled to the phase differencing circuit (82), a filter (86) coupled to the first modulo circuit (86), and a summation circuit (88) having a positive input and a negative input, the positive input being coupled to the averager input (80), the negative input being coupled to the filter (86). The phase averaging circuit (80) further includes a second modulo circuit (89) coupled to the summation circuit (88). An alternative embodiment of the phase averaging circuit (fig. 11) includes a delay line (112) having a plurality of taps (114) coupled to an averager input (116) and a plurality of first subtractor circuits (118), a first input of each first subtractor circuit (118) being coupled to the averager input (116), a second input of each first subtractor circuit (118) being coupled to a corresponding tap (114) of the plurality of taps (114).

    Tracking carrier timing utilising frequency offset error signal
    90.
    发明公开
    Tracking carrier timing utilising frequency offset error signal 失效
    Trägerfolgesystemunter Anwendung eines Fehleroffsetfrequenzsignals

    公开(公告)号：EP0969636A1

    公开(公告)日：2000-01-05

    申请号：EP98305166.5

    申请日：1998-06-30

    申请人： LUCENT TECHNOLOGIES INC.

    发明人： Van Driest, H.

    IPC分类号： H04L27/233

    CPC分类号： H04L27/2332 ,  H03J7/04 ,  H04L7/0029 ,  H04L2027/003 ,  H04L2027/0046

    摘要： The timing of a carrier signal is tracked in a receiver. The receiver receives a signal produced by a transmitter having a single frequency source which is used to generate a reference clock frequency and a carrier signal frequency, there being a fixed, predetermined relationship between the reference and carrier frequencies. In the receiver there is a single frequency source which is used to generate a reference clock frequency and a carrier reference signal frequency, there being a fixed, predetermined relationship between the reference and carrier reference frequencies. The fixed, predetermined relationship in the transmitter and the receiver is the same.

    摘要翻译： 在接收机中跟踪载波信号的定时。 接收机接收由具有单个频率源的发射机产生的信号，该单个频率源用于产生参考时钟频率和载波信号频率，在参考频率和载波频率之间存在固定的预定关系。 在接收机中，存在用于产生参考时钟频率和载波参考信号频率的单个频率源，在参考和载波参考频率之间存在固定的预定关系。 发射机和接收机中固定的预定关系是相同的。