利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

60 条记录 (耗时 0.009 秒)

    Quadrature modulator with adaptive suppression of carrier leakage
    43.
    发明公开
    Quadrature modulator with adaptive suppression of carrier leakage 失效
    四调制器自适应调制器。

    公开(公告)号：EP0661801A1

    公开(公告)日：1995-07-05

    申请号：EP94309180.1

    申请日：1994-12-09

    申请人： AT&T Corp.

    发明人： Blodgett, James Russell

    IPC分类号： H03D7/16 ,  H04L27/36

    CPC分类号： H03C3/406 ,  H03C1/52 ,  H03D7/168 ,  H04L27/368

    摘要： A carrier leakage suppression circuit (306) adaptively suppresses carrier leakage in a signal processing device (304) which modulates a carrier signal (346) with an in-phase baseband signal (342) and a quadrature baseband signal (344) to generate a radio frequency (RF) output signal (350). The carrier leakage suppression circuit operates by imparting (by 308) a first signature (354) to the in-phase baseband signal and a second signature to the quadrature baseband (by 310) signal prior to modulation (in 312, 316) of the carrier signal. In-phase and quadrature carrier leakage components in the RF output signal are isolated and measured (in 320,322,324,326) by respectively correlating (in 328,330) the RF output signal with the first and second signatures. An in-phase offset (368) and a quadrature offset (366) are generated as a function of the measurement of the in-phase and quadrature carrier leakage components. The in-phase baseband signal is combined (in 308) with the in-phase offset and the quadrature baseband signal is combined (in 310) with the quadrature offset to thereby suppress carrier leakage due to the in-phase baseband signal and the quadrature baseband signal.

    摘要翻译： 用于在利用基带信号调制载波信号以产生射频（RF）输出信号的信号处理装置中自适应地抑制载波泄漏的载波泄漏抑制电路具有用于在调制载波之前对基带信号进行签名的装置 信号。 在调制之后，RF输出信号包括携带签名的载波泄漏分量。 器件通过将输出信号与签名相关联来隔离并测量RF输出信号中的载波泄漏分量。 装置产生作为载波泄漏分量的测量的函数的偏移信号。 混合器将基带信号与偏移信号组合，从而抑制由于基带信号引起的载波泄漏。

    Calibration method for vector modulators
    45.
    发明公开
    Calibration method for vector modulators 失效
    KalibrierungsverfahrenfürVektormodulatoren。

    公开(公告)号：EP0617532A1

    公开(公告)日：1994-09-28

    申请号：EP94302041.2

    申请日：1994-03-22

    申请人： NOKIA MOBILE PHONES LTD.

    发明人： Tiittanen, Erkki ,  Mattila, Heikki ,  Rautava, Tapio ,  Matero, Jorma ,  Ostman, Kjell ,  Halttunen, Mikko

    IPC分类号： H04L27/20

    CPC分类号： H04L27/364 ,  H03C3/406 ,  H04B1/0475 ,  H04L27/2071

    摘要： Method and system, for calibrating a vector modulator that does not require a network analyzer, are disclosed which are incorporated in a vector modulation system comprising a standard vector modulator circuit including means for shifting phase to adjust the relative phases of the I and Q components of the modulated RF carrier. Means for attenuating are included in the I and Q modulation system to adjust the relative amplitude of the modulation signals. The disclosure describes a technique wherein the microwave transmitter's I and Q phase difference is measured by measuring the power levels of selected frequencies of the RF output signal. The power levels are compared and a correction value is stored in a read-only memory to compensate for the error. More particularly, the error compensation is achieved by first determining amplitude error or unbalance by I and Q signal power measurement and an amplitude compensation signal is stored, then a power measurement is carried out for phase compensation and a phase compensation signal is stored.

    摘要翻译： 公开了用于校准不需要网络分析器的矢量调制器的方法和系统，其被并入矢量调制系统中，该矢量调制系统包括标准矢量调制器电路，包括用于移相的装置，以调整I和Q分量的相对相位 调制的RF载波。 在I和Q调制系统中包括用于衰减的装置，以调整调制信号的相对幅度。 本公开描述了一种技术，其中通过测量RF输出信号的选定频率的功率电平来测量微波发射器的I和Q相位差。 功率电平进行比较，校正值存储在只读存储器中以补偿误差。 更具体地，通过首先通过I和Q信号功率测量来确定振幅误差或不平衡来存储误差补偿，并且存储幅度补偿信号，然后执行功率测量以进行相位补偿，并且存储相位补偿信号。

    Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto
    46.
    发明公开
    Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto 失效
    适用于连接放大器非线性的调节系统

    公开(公告)号：EP0377519A3

    公开(公告)日：1990-12-27

    申请号：EP90300131.1

    申请日：1990-01-05

    申请人： NEC CORPORATION

    发明人： Nagata, Yoshinori, c/o Nec Corporation

    IPC分类号： H03C1/06 ,  H03C5/00 ,  H04L27/36

    CPC分类号： H04L27/368 ,  H03C1/06 ,  H03C1/50 ,  H03C3/02 ,  H03C3/08 ,  H03C3/406 ,  H03C5/00 ,  H03C2200/0058 ,  H03C2200/0079 ,  H03D1/2245 ,  H03D7/168 ,  H03F1/3247 ,  H03F1/3282 ,  H03F1/3294 ,  H03F2201/3233

    摘要： In a modulation system responsive to a first sampled signal (31) of a first sampling rate for supplying a modulated analog signal to an amplifier having nonlinearities to make the amplifier produce an amplified output signal, a selector (72) selects the first sampled signal and a second sampled signal of a second sampling rate as a selected signal when supplied with first and second control signals, respectively. The second sampling rate is equal to 1/N (N: 2, 3, ...) of the first sampling rate. A processing arrangement (36) processes the selected signal with reference to a difference between the selected signal and an additional digital signal (35) to compensate for the nonlinearities to produce a processed signal. The processed signal is modulated into the modulated analog signal. The amplified output signal is demodulated and converted into the additional digital signal by a converter (40). A comparator (71) compares an absolute value of the difference with a threshold value and produces the first control signal when the absolute value is less than the threshold value. Otherwise, the second control signal is produced. A controller (78) may control a phase of a sampling signal supplied to the converter so that a quotient of the difference by a differential of the selected signal becomes equal to zero.

    SYSTEMS AND METHODS FOR ASYNCHRONOUS RE-MODULATION WITH ADAPTIVE I/Q ADJUSTMENT
    48.
    发明公开
    SYSTEMS AND METHODS FOR ASYNCHRONOUS RE-MODULATION WITH ADAPTIVE I/Q ADJUSTMENT 有权
    SYSTEME UND VERFAHREN ZUR ASYNCHRONEN NEUMODULATION MIT ADAPTIVER I / Q-EINSTELLUNG

    公开(公告)号：EP2761746A4

    公开(公告)日：2015-07-22

    申请号：EP12835449

    申请日：2012-09-26

    申请人： AVIAT NETWORKS INC

    发明人： VANN EMERICK ,  CHAO YEN-FANG ,  QIN YOUMING ,  MATIAN ROLAND

    IPC分类号： H03H7/30 ,  H04B1/28

    CPC分类号： H04L1/206 ,  H03C3/406 ,  H03D3/009 ,  H03D7/168 ,  H04B1/0014 ,  H04B1/10 ,  H04B1/16 ,  H04B1/28 ,  H04B1/30 ,  H04L1/0036 ,  H04L1/203 ,  H04L1/208 ,  H04L27/38 ,  H04L27/3854

    摘要： Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase ("I") signal and a quadrature ("Q") signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.

    摘要翻译： 各种实施例提供了用于使用解调然后再调制将一个调制信号信号转换到另一调制信号的系统和方法。 根据一些实施例，信号接收系统可以包括将第一调制信号解调为同相（“I”）信号和正交（“Q”）信号的I / Q解调器，I / Q信号调节器， 自适应地调整Q信号以增加基于第二调制信号的瞬态信号的信噪比（SNR），以及将I信号和经调整的Q信号调制为第二调制信号的I / Q调制器 信号。 为了增加SNR，可以基于在由I / Q调制器下游的解调器解调期间为瞬态信号确定的计算误差来调整Q信号。