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    Apparatus and method for estimating carrier frequency offset
    3.
    发明授权
    Apparatus and method for estimating carrier frequency offset 有权

    公开(公告)号：US09948491B2

    公开(公告)日：2018-04-17

    申请号：US15408622

    申请日：2017-01-18

    申请人： MStar Semiconductor, Inc.

    发明人： Kuan-Chou Lee ,  Tai-Lai Tung

    IPC分类号： H04L27/38 ,  H04L27/18

    CPC分类号： H04L27/3854 ,  H04L27/18

    摘要： An apparatus for estimating carrier frequency offset includes an Mth-power circuit, a spectrum generating circuit, a spectrum adjusting circuit, a peak frequency determining circuit and a frequency offset determining circuit. The Mth-power circuit performs an Mth-power calculation on an input signal to generate an Mth-power calculation result. The spectrum generating circuit generates a spectrum according to the Mth-power calculation result. The spectrum adjusting circuit identifies a partial energy peak value in a partial frequency range from the spectrum, and increases the partial energy peak value to be higher than any other energy in the spectrum to generate an adjusted spectrum. The peak frequency determining circuit identifies a peak frequency having a maximum energy peak value from the adjusted spectrum. The frequency offset determining circuit determines an estimated carrier frequency offset result according to the peak frequency.

    RECEIVING CIRCUIT FOR ESTIMATING FREQUENCY OFFSET AND ASSOCIATED METHOD
    4.
    发明申请
    RECEIVING CIRCUIT FOR ESTIMATING FREQUENCY OFFSET AND ASSOCIATED METHOD 审中-公开

    公开(公告)号：US20170244589A1

    公开(公告)日：2017-08-24

    申请号：US14987915

    申请日：2016-01-05

    申请人： MStar Semiconductor, Inc.

    发明人： Yu-Che SU ,  Yi-Ying LIAO ,  Kuan-Chou LEE ,  Tai-Lai TUNG

    IPC分类号： H04L27/38

    CPC分类号： H04L27/3854 ,  H04L27/0014

    摘要： A receiving circuit capable of estimating frequency offset includes a front circuit and a calculation circuit. The front circuit receives a remote signal to generate a received signal. The calculation circuit includes: an exponentiation module, calculating an exponent of a power to generate a high-order signal; a frequency-domain transform module, performing frequency-domain transform on the high-order signal to generate a spectrum; a peak searching module, searching for a peak of the amplitude of the spectrum to generate a peak coordinate value reflecting a frequency where the peak occurs; an offset estimating module, adding the peak coordinate value with a compensation value to generate a sum, dividing the sum by a first divisor to generate a remainder, subtracting the compensation value from the remainder to generate a difference, and dividing the difference by a second divisor to generate an offset estimation value reflecting the frequency offset.

    System and Method for Transmitting Data with Useful Signal Detection at the Receiver End
    5.
    发明申请
    System and Method for Transmitting Data with Useful Signal Detection at the Receiver End 审中-公开
    用于在接收端发送具有有用信号检测的数据的系统和方法

    公开(公告)号：US20160241426A1

    公开(公告)日：2016-08-18

    申请号：US15029801

    申请日：2014-09-30

    申请人： CONTINENTAL AUTOMOTIVE GMBH

    发明人： Martin Opitz

    IPC分类号： H04L27/38 ,  H04B1/707

    CPC分类号： H04L27/3827 ,  H03D3/003 ,  H04B1/707 ,  H04L27/227 ,  H04L27/2278 ,  H04L27/233 ,  H04L27/3854 ,  H04L2027/003

    摘要： The present disclosure teaches methods for digitally transmitting data. An example method may include: receiving a modulated signal containing at least one useful signal or noise or interference signals; repeatedly estimating at least one parameter of the received signal relevant to the demodulation of the useful signal; monitoring changes in the repeatedly estimated parameters; and detecting a useful signal based at least in part on whether one or more changes in the repeatedly estimated parameters satisfy at least one particular, predefined condition.

    摘要翻译： 本公开教导了数字传输数据的方法。 示例性方法可以包括：接收包含至少一个有用信号或噪声或干扰信号的调制信号; 重复地估计与有用信号的解调相关的接收信号的至少一个参数; 监测重复估计参数的变化; 以及至少部分地基于所述重复估计参数中的一个或多个改变是否满足至少一个特定的预定义条件来检测有用信号。

    Measurement of DC offsets in IQ modulators
    7.
    发明授权
    Measurement of DC offsets in IQ modulators 有权
    IQ调制器中直流偏移的测量

    公开(公告)号：US09025648B2

    公开(公告)日：2015-05-05

    申请号：US13774565

    申请日：2013-02-22

    申请人： Tektronix, Inc.

    发明人： Zoltan Azary

    IPC分类号： H04B3/46 ,  H04B17/00 ,  H03C3/40 ,  H04L27/36

    CPC分类号： H04B17/104 ,  H03C3/40 ,  H04L27/364 ,  H04L27/3854

    摘要： Described are systems and methods of determining DC offset voltages in IQ modulators. First, two different DC test voltages are selected for one of the inputs to the IQ modulator. Then, a first test voltage is applied to one input to the IQ modulator while test data is generated by measuring outputs from a set of signals applied to the other input to the IQ modulator. Then the second test voltage is applied and another set of test data generated. From the first and second sets of test data, second-order polynomial functions may be constructed and compared to one another to yield a ratio of power value outputs. Then the DC offset voltages may be determined from the ratio of power value outputs.

    摘要翻译： 描述了在IQ调制器中确定DC偏移电压的系统和方法。 首先，为IQ调制器的输入之一选择两个不同的直流测试电压。 然后，通过测量从施加到IQ调制器的另一个输入的一组信号的输出来产生测试数据，将第一测试电压施加到IQ调制器的一个输入。 然后施加第二个测试电压，并产生另一组测试数据。 从第一组和第二组测试数据中，可以构造二阶多项式函数并将其相互比较以产生功率值输出的比率。 然后可以根据功率值输出的比率来确定DC偏移电压。

    Systems and methods for asynchronous re-modulation with adaptive I/Q adjustment
    8.
    发明授权
    Systems and methods for asynchronous re-modulation with adaptive I/Q adjustment 有权
    具有自适应I / Q调整的异步重新调制的系统和方法

    公开(公告)号：US08630600B1

    公开(公告)日：2014-01-14

    申请号：US13627996

    申请日：2012-09-26

    申请人： Aviat U.S., Inc.

    发明人： Emerick Vann ,  Yen-Fang Chao ,  Youming Qin ,  Roland Matian

    IPC分类号： H04B17/00

    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。

    Apparatus and method for removing common phase error in a DVB-T/H receiver
    9.
    发明授权
    Apparatus and method for removing common phase error in a DVB-T/H receiver 有权
    用于去除DVB-T / H接收机中的共同相位误差的装置和方法

    公开(公告)号：US08559490B2

    公开(公告)日：2013-10-15

    申请号：US12452411

    申请日：2007-06-29

    申请人： Peng Liu ,  Jilin Zou ,  Li Zou

    发明人： Peng Liu ,  Jilin Zou ,  Li Zou

    IPC分类号： H04B3/46 ,  H04B17/00 ,  H04Q1/20

    CPC分类号： H04L27/2647 ,  H04L25/022 ,  H04L25/03159 ,  H04L27/3854

    摘要： A receiver is a Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver. The DVB-T/H receiver comprises a phase error corrector and a channel estimation and equalization element. The phase error corrector rotates a signal in accordance with an estimate of a phase error, e.g., CPE, which is determined as a function of channel state information (CSI) provided by the channel estimation and equalization element.

    摘要翻译： 接收机是数字视频广播地面/手持（DVB-T / H）接收机。 DVB-T / H接收机包括相位误差校正器和信道估计和均衡元件。 相位误差校正器根据由信道估计和均衡元件提供的信道状态信息（CSI）的函数确定的相位误差（例如CPE）的估计来旋转信号。

    MODEM DEVICE AND AMPLITUDE ADJUSTMENT METHOD
    10.
    发明申请
    MODEM DEVICE AND AMPLITUDE ADJUSTMENT METHOD 有权
    调制解调器和调制调整方法

    公开(公告)号：US20130101001A1

    公开(公告)日：2013-04-25

    申请号：US13806596

    申请日：2011-05-30

    申请人： Taro Teramoto

    发明人： Taro Teramoto

    IPC分类号： H04L27/08

    CPC分类号： H04L27/08 ,  H04L27/362 ,  H04L27/364 ,  H04L27/368 ,  H04L27/3854

    摘要： A modem device includes a modulation unit 12 that generates a modulated signal, a frequency conversion unit 15 that generates an intermediate frequency signal from an external input signal, and a demodulation unit 14 that demodulates the modulated or intermediate frequency signal and generates a reception signal. In a communication mode, the modulation unit 12 outputs the modulated signal to a external device 50, the frequency conversion unit 15 generates the intermediate frequency signal, and the demodulation unit 14 demodulates the intermediate frequency signal and generates the reception signal. In an adjustment mode, the modulation unit 12 outputs the modulated signal to the demodulation unit 14, and the demodulation unit 14 generates the reception signal from the modulated signal and adjusts an amplitude of the transmission signal based on the reception signal.

    摘要翻译： 调制解调器装置包括生成调制信号的调制单元12，从外部输入信号产生中频信号的频率转换单元15以及对调制或中频信号进行解调并产生接收信号的解调单元14。 在通信模式中，调制单元12将调制信号输出到外部设备50，频率转换单元15产生中频信号，并且解调单元14对中频信号进行解调并产生接收信号。 在调整模式中，调制单元12将调制信号输出到解调单元14，并且解调单元14根据调制信号产生接收信号，并根据接收信号调整发送信号的幅度。