公开(公告)号：US20140269985A1

公开(公告)日：2014-09-18

申请号：US13828989

申请日：2013-03-14

申请人： ANALOG DEVICES TECHNOLOGY

发明人： Haim Primo ,  Manish J. Manglani ,  Yosef Stein

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03D7/165 ,  H03D2200/0043 ,  H04L25/061 ,  H04L27/364 ,  H04L27/366

摘要： Apparatus and methods for estimating a direct current offset in an upconverter are disclosed. Samples of a first signal are received. Values of a compensation signal are retrieved. For example, the compensation signal can be a component in a modified baseband signal, wherein the modified baseband signal is upconverted, downconverted, and filtered to generate the first signal. An estimate of a first DC offset induced by an upconverter is generated based at least partly on at least two selected samples of the first signal and corresponding values of the compensation signal.

摘要翻译： 公开了用于估计上变频器中的直流偏移的装置和方法。 接收第一信号的样本。 检索补偿信号的值。 例如，补偿信号可以是修改的基带信号中的分量，其中修改的基带信号被上变频，下变频和滤波以产生第一信号。 至少部分地基于第一信号的至少两个选定样本和补偿信号的对应值来生成由上变频器引起的第一DC偏移的估计。

公开(公告)号：US08831550B2

公开(公告)日：2014-09-09

申请号：US13937198

申请日：2013-07-08

申请人： Realtek Semiconductor Corp.

发明人： Yuan-Shuo Chang ,  Wen-Shan Wang

IPC分类号： H04B1/10 ,  H04B17/00

CPC分类号： H04B1/10 ,  H03C5/00 ,  H03D3/009 ,  H04B1/30 ,  H04L27/0014 ,  H04L27/364 ,  H04L27/3809 ,  H04L27/3863

摘要： Filter coefficients are generated by testing a wireless communication system using single-tone signals. While using the filter coefficients in a filter module, signal imbalance caused by a local oscillator or analog elements in a wireless communication system can be eliminated, so as to prevent the wireless communication system from being affected by the noises.

摘要翻译： 通过使用单音信号测试无线通信系统来产生滤波器系数。 当在滤波器模块中使用滤波器系数时，可以消除由无线通信系统中的本地振荡器或模拟元件引起的信号不平衡，从而防止无线通信系统受到噪声的影响。

公开(公告)号：US20140219402A1

公开(公告)日：2014-08-07

申请号：US13759682

申请日：2013-02-05

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Yingqun Yu ,  Heejin Roh ,  Vladislav Sorokine ,  Jungwon Lee ,  Inyup Kang

IPC分类号： H04L1/00

CPC分类号： H04L1/0036 ,  H04L25/03038 ,  H04L27/364

摘要： A method of operation of a wireless communication system includes: tuning a receiver front end for receiving a radio-frequency signal; correcting, with an in-phase/quadrature (I/Q) compensation module, an I/Q imbalance from the receiver front end including estimating by a linear minimum mean-square error (LMMSE) module; and processing by a base band receiver for digitizing an output of the I/Q compensation module for generating a receiver data.

摘要翻译： 无线通信系统的操作方法包括：调谐接收器前端以接收射频信号; 用同相/正交（I / Q）补偿模块校正来自接收机前端的I / Q不平衡，包括通过线性最小均方误差（LMMSE）模块的估计; 以及由基带接收器进行处理，以对I / Q补偿模块的输出进行数字化，以生成接收机数据。

公开(公告)号：US08774316B2

公开(公告)日：2014-07-08

申请号：US13181819

申请日：2011-07-13

申请人： Mark W. Thompson ,  Robert E. Daminski ,  Brian C. Padalino

发明人： Mark W. Thompson ,  Robert E. Daminski ,  Brian C. Padalino

IPC分类号： H03C3/00

CPC分类号： H04L27/364

摘要： A transmitter includes an input, a modulator, and a calibration memory configured to store discrete calibration test points. A compensator is coupled between the input and the modulator and cooperates with the calibration memory to cause the modulator to generate a respective calibration carrier signal for each of the discrete calibration test points during a calibration phase. A detector is coupled to an output of the modulator and is configured to determine respective calibration values of the calibration carrier signals during the calibration phase. A compensator calculator is coupled to an output of the detector, and is configured to generate compensation values for the compensator for use during an operation phase and based on the calibration values of the calibration carrier signals.

摘要翻译： 发射机包括输入，调制器和被配置为存储离散校准测试点的校准存储器。 补偿器耦合在输入和调制器之间并与校准存储器配合，以使得调制器在校准阶段期间为每个离散校准测试点产生相应的校准载波信号。 检测器耦合到调制器的输出，并被配置为在校准阶段期间确定校准载波信号的相应校准值。 补偿器计算器耦合到检测器的输出端，并且被配置为产生用于补偿器的补偿值，以在操作阶段期间使用并且基于校准载波信号的校准值。

公开(公告)号：US20140064406A1

公开(公告)日：2014-03-06

申请号：US14114537

申请日：2012-02-06

申请人： Masahiko Onishi

发明人： Masahiko Onishi

IPC分类号： H04L25/10

CPC分类号： H04L25/10 ,  H03C3/40 ,  H03F1/3247 ,  H03F1/3294 ,  H03F1/34 ,  H03F3/24 ,  H03F3/245 ,  H04B2001/0433 ,  H04L27/361 ,  H04L27/364 ,  H04L27/368

摘要： A quadrature modulation error is compensated without providing an additional feedback loop for detecting quadrature modulation error. An amplifier circuit includes: a quadrature modulator; an amplifier that amplifies a quadrature-modulated signal; a distortion compensation section that compensates distortion to be caused in the amplifier based on first compensation coefficients; a quadrature modulation error compensation section that compensates for a quadrature modulation error; an updating section that updates second compensation coefficients for compensating the quadrature modulation error; an error estimation section that estimates an error of the quadrature modulation error; and a prediction section that calculates a prediction value of an output of the amplifier after updating of the second compensation coefficients. The second compensation coefficients are updated based on the estimated error. The prediction value is calculated based on the estimated error and the amplifier output. The distortion compensation section calculates the first compensation coefficient, based on the prediction value.

摘要翻译： 补偿正交调制误差而不提供用于检测正交调制误差的附加反馈回路。 放大器电路包括：正交调制器; 放大正交调制信号的放大器; 失真补偿部，其基于第一补偿系数补偿在放大器中引起的失真; 补偿正交调制误差的正交调制误差补偿部分; 更新部，其更新用于补偿所述正交调制误差的第二补偿系数; 误差估计部，估计正交调制误差的误差; 以及预测部，其在更新所述第二补偿系数之后计算所述放大器的输出的预测值。 基于估计的误差来更新第二补偿系数。 基于估计误差和放大器输出计算预测值。 失真补偿部根据预测值计算第一补偿系数。

公开(公告)号：US08644420B2

公开(公告)日：2014-02-04

申请号：US13078733

申请日：2011-04-01

申请人： Sunil Kumar Singh Khatana ,  Lee Dardis

发明人： Sunil Kumar Singh Khatana ,  Lee Dardis

IPC分类号： H04L27/20

CPC分类号： H04L27/364 ,  H04B10/5053 ,  H04B10/5057 ,  H04B10/50577 ,  H04B10/5561

摘要： I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include streams of alternating ones and zeroes.

摘要翻译： 可以通过向I和Q通道PSK调制器发送相同或补充的数据流来检测QPSK调制器中的I / Q数据偏移，将I和Q之间的相对载波相位设置为零或pi，并监视平均QPSK输出功率，其中 发送到I和Q信道的数据流包括交替的和零的流。

公开(公告)号：US08630370B2

公开(公告)日：2014-01-14

申请号：US13122300

申请日：2009-10-07

申请人： Young-Taek Lee ,  Hoon-Tae Kim

发明人： Young-Taek Lee ,  Hoon-Tae Kim

IPC分类号： H03C3/00

CPC分类号： H04B1/0475 ,  H03C2200/0041 ,  H03D7/18 ,  H03D2200/0045 ,  H03F3/3022 ,  H03F2203/30031 ,  H04B2001/0491 ,  H04L27/364

摘要： An apparatus and a method for increasing Error Vector Magnitude (EVM) performance representing quality of transmission signal are provided. The apparatus and the method suppress an image frequency component generated due to mismatch of IQ channels in order to transmit/receive a large amount of data without distortion in 4th generation wireless communication standard candidate technologies such as a Long Term Evolution (LTE) system and a mobile WiMax system. The apparatus includes a LOcal frequency (LO) buffer including an amplifier. The LO buffer controls the gain and the phase of the amplifier using a control bit for controlling resistor connection.

摘要翻译： 提供了一种用于增加表示传输信号质量的误差矢量幅度（EVM）性能的装置和方法。 该装置和方法抑制由于IQ信道不匹配而产生的图像频率分量，以便在诸如长期演进（LTE）系统和第四代无线通信标准候选技术的第四代无线通信标准候选技术中发送/接收大量数据而不失真 移动WiMax系统。 该装置包括包括放大器的LOcal频率（LO）缓冲器。 LO缓冲器使用用于控制电阻连接的控制位来控制放大器的增益和相位。

公开(公告)号：US08586461B2

公开(公告)日：2013-11-19

申请号：US12632571

申请日：2009-12-07

申请人： Jan-Michael Stevenson

发明人： Jan-Michael Stevenson

IPC分类号： H04N5/14 ,  H04N5/50

CPC分类号： H04B15/04 ,  H03D1/2245 ,  H03D3/008 ,  H03D3/009 ,  H04B1/0082 ,  H04B1/30 ,  H04B1/401 ,  H04B2215/065 ,  H04L25/061 ,  H04L27/364 ,  H04N5/455 ,  H04N5/46 ,  H04N21/42638 ,  H04N21/4382 ,  H04N21/6112

摘要： Systems and methods which provide a multimode tuner architecture implementing direct frequency conversion are shown. Embodiments provide a highly integrated configuration wherein low noise amplifier, tuner, analog and digital channel filter, and analog demodulator functionality are provided in a single integrated circuit. A LNA of embodiments implements a multi-path configuration with seamless switching to provide desired gain control while meeting noise and linearity design parameters. Embodiments of the invention implement in-phase and quadrature (IQ) equalization and a multimode channelization filter architecture to facilitate the use of direct frequency conversion. Embodiments implement spur avoidance techniques for improving tuner system operation and output using a clock signal generation architecture in which a system clock, sampling clock frequencies, local oscillator (LO) reference clock frequencies, and/or the like are dynamically movable.

摘要翻译： 示出了提供实现直接频率转换的多模调谐器架构的系统和方法。 实施例提供高度集成的配置，其中在单个集成电路中提供低噪声放大器，调谐器，模拟和数字信道滤波器以及模拟解调器功能。 实施例的LNA实现具有无缝切换的多路径配置，以在满足噪声和线性设计参数的同时提供期望的增益控制。 本发明的实施例实现了同相和正交（IQ）均衡和多模信道化滤波器架构，以便于直接频率转换的使用。 实施例实现了使用其中系统时钟，采样时钟频率，本地振荡器（LO）参考时钟频率等等是可动态移动的时钟信号生成架构来改进调谐器系统操作和输出的杂散避免技术。

公开(公告)号：US20130238262A1

公开(公告)日：2013-09-12

申请号：US13747485

申请日：2013-01-23

申请人： ADVANTEST CORPORATION

发明人： Koji ASAMI

IPC分类号： G01R31/317

CPC分类号： G01R31/31706 ,  G01R31/2822 ,  H04L1/24 ,  H04L27/2647 ,  H04L27/364 ,  H04L2027/0087

摘要： A measurement apparatus comprising an IQ error measuring section that measures a frequency characteristic of an IQ error of a device under measurement; and an error amount calculating section that calculates EVM based on a constellation error, at each of a plurality of frequencies, between an ideal signal to be output in response to input of a predetermined signal into a model of the device under measurement that does not include an IQ error and a prediction signal that is to be output in response to the input of the predetermined signal into a model of the device under measurement that includes the IQ error measured by the IQ error measuring section, wherein the error amount calculating section corrects a signal component at each of the frequencies in the prediction signal according to a channel characteristic, and calculates the constellation error.

摘要翻译： 一种测量装置，包括测量被测设备的IQ误差的频率特性的IQ误差测量部分; 以及误差量计算部，其基于在多个频率中的每一个在响应于预定信号的输入的待输出的理想信号到不包括被测量的装置的模型中的星座图误差来计算EVM IQ误差和预测信号，其将响应于预定信号的输入被输出到包括由IQ误差测量部分测量的IQ误差的被测器件的模型，其中误差量计算部分校正一个 根据通道特性在预测信号中的每个频率处的信号分量，并且计算星座误差。

公开(公告)号：US20130223849A1

公开(公告)日：2013-08-29

申请号：US13404471

申请日：2012-02-24

申请人： James Whiteaway ,  Thomas Duthel ,  Jonas Geyer

发明人： James Whiteaway ,  Thomas Duthel ,  Jonas Geyer

IPC分类号： H04B10/12 ,  H04B10/04

CPC分类号： H04B10/541 ,  H04L27/3411 ,  H04L27/364 ,  H04L27/368

摘要： According to a first aspect, techniques are provided to optimize a Mach-Zehnder modulator drive waveform by distorting the outer modulation levels of the waveform, thereby equalizing eye openings of the received optical field, and in particular creating a wider and more defined central eye opening of the received optical field. According to a second aspect, techniques are provided to adjust in-phase (I) modulation levels based on the imperfect performance of a Mach-Zehnder modulator allocated to modulate quadrature-phase (Q) modulation levels, and conversely to adjust the Q modulation levels based on the imperfect performance of an MZ modulator allocated to modulate I modulation levels.

摘要翻译： 根据第一方面，提供了通过使波形的外部调制级别失真来优化马赫 - 曾德调制器驱动波形的技术，从而均衡所接收的光学场的眼睛开口，并且特别地产生更宽和更加限定的中心眼睛开口 的接收光场。 根据第二方面，提供了用于基于分配给调制正交相位（Q）调制电平的马赫 - 曾德调制器的不完美性能来调整同相（I）调制电平的技术，并且相反地调整Q调制电平 基于分配给调制I调制电平的MZ调制器的不完美性能。