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    Noise variance estimation and interference detection
    32.
    发明授权
    Noise variance estimation and interference detection 有权
    噪声方差估计和干扰检测

    公开(公告)号：US09194902B2

    公开(公告)日：2015-11-24

    申请号：US13889961

    申请日：2013-05-08

    Applicant: Imagination Technologies Limited

    Inventor： Paul Murrin ,  Mohammed El-Hajjar

    IPC: H04B7/06 ,  H04W28/04 ,  G01R29/26 ,  G01R29/02 ,  H04L1/20 ,  H04B17/345

    CPC classification number: G01R29/02 ,  H04B17/345 ,  H04L1/20 ,  H04L1/206 ,  H04L27/2647

    Abstract: Noise variance estimation and interference detection is described. In one example, a method of estimating noise variance is described in which the pilots within a received OFDM signal are divided into bands and then a noise variance estimate is calculated on a per-band basis by averaging the noise estimates for those pilots within the band. In some examples, the pilots are divided into bands in frequency and in other examples, the pilots are divided into bands in frequency and time, such that noise estimates from more than one OFDM symbol are used in calculating the per-band noise variance estimates. The noise variance estimate for a pilot is then set to the noise variance estimate for the band which contains the pilot. The noise variance estimate for a data sub-carrier can then be determined by interpolating between the values for the pilots.

    Abstract translation: 描述噪声方差估计和干扰检测。 在一个示例中，描述了估计噪声方差的方法，其中接收的OFDM信号内的导频被划分成频带，然后通过对频带内的那些导频的噪声估计进行平均来计算每个频带的噪声方差估计 。 在一些示例中，导频在频率上被划分为频带，在其他示例中，导频在频率和时间上被划分成频带，使得来自多于一个OFDM符号的噪声估计被用于计算每频带噪声方差估计。 然后将导频的噪声方差估计设置为包含导频的频带的噪声方差估计。 然后可以通过在导频的值之间进行插值来确定数据子载波的噪声方差估计。

    Signal detection in noise
    33.
    发明授权
    Signal detection in noise 有权
    噪声信号检测

    公开(公告)号：US09191062B2

    公开(公告)日：2015-11-17

    申请号：US13993514

    申请日：2011-12-21

    Applicant: Philip Young

    Inventor： Philip Young

    IPC: H04B1/7097 ,  H03M13/09 ,  H04B1/7073 ,  H04L1/00 ,  H04L1/20

    CPC classification number: H04B1/7097 ,  H03M13/09 ,  H04B1/7073 ,  H04L1/0046 ,  H04L1/0061 ,  H04L1/206

    Abstract: A method of detecting a transmission. The method includes: measuring, from a first portion of a received spread-spectrum signal, a first code-phase of a spreading-code; measuring, from a second portion of the signal, a second code-phase of the spreading-code; comparing the first and second code-phases; and detecting whether the transmission is present according to the result of the comparison. Also disclosed are corresponding methods and apparatus for transmission and reception of signals.

    Abstract translation: 一种检测传输的方法。 该方法包括：从接收的扩频信号的第一部分测量扩展码的第一码相位; 从所述信号的第二部分测量所述扩展码的第二码相位; 比较第一和第二代码阶段; 并根据比较结果来检测是否存在传输。 还公开了用于发送和接收信号的相应方法和装置。

    Time-Domain Mechanism for Computing Error Vector Magnitude of OFDM Signals
    34.
    发明申请
    Time-Domain Mechanism for Computing Error Vector Magnitude of OFDM Signals 有权
    用于计算OFDM信号误差矢量幅度的时域机制

    公开(公告)号：US20150304075A1

    公开(公告)日：2015-10-22

    申请号：US14255046

    申请日：2014-04-17

    Applicant: NATIONAL INSTRUMENTS CORPORATION

    Inventor： I. Zakir Ahmed ,  Craig E. Rupp ,  Ramanujeya Lakshminarayan Narahari

    IPC: H04L1/20 ,  H04L27/26

    CPC classification number: H04L1/203 ,  H04L1/206 ,  H04L27/2637 ,  H04L27/2662

    Abstract: A mechanism for determining an error vector magnitude EVMTD for a signal transmitted by a device under test (DUT). A receiver (typically an RF signal analyzer) produces a baseband signal in response to the signal transmission. An OFDM input signal (derived from the baseband signal) is accessed from memory. The OFDM input signal includes a sequence of time-domain OFDM input symbols. A reference signal is accessed from the memory. The reference signal includes a sequence of time-domain OFDM reference symbols. EVMTD is computed in the time domain based on a time-domain difference signal, i.e., a time-domain difference between the sequence of time-domain OFDM input symbols and the sequence of time-domain OFDM reference symbols. The error vector magnitude EVMTD is determined without transforming the sequence of time-domain OFDM input symbols to the frequency domain. The error vector magnitude EVMTD is related to a standard-defined composite EVM by a scalar multiple.

    Abstract translation: 用于确定由被测器件（DUT）发送的信号的误差向量幅度EVMTD的机构。 接收器（通常是RF信号分析器）响应于信号传输产生基带信号。 从存储器访问OFDM输入信号（从基带信号导出）。 OFDM输入信号包括时域OFDM输入符号序列。 从存储器访问参考信号。 参考信号包括时域OFDM参考符号序列。 基于时域差信号，即时域OFDM输入符号序列与时域OFDM参考符号序列之间的时域差，在时域中计算EVMTD。 确定误差向量幅度EVMTD，而不将时域OFDM输入符号的序列变换到频域。 误差向量幅度EVMTD与标准多项式的标准复合EVM相关。

    Numerical control system having removable filter circuit
    35.
    发明授权
    Numerical control system having removable filter circuit 有权
    具有可拆卸滤波电路的数控系统

    公开(公告)号：US09128839B2

    公开(公告)日：2015-09-08

    申请号：US14031617

    申请日：2013-09-19

    Applicant: FANUC Corporation

    Inventor： Yuuji Sone ,  Hiroshige Andou

    IPC: G06F11/07

    CPC classification number: G06F11/0772 ,  H04L1/206

    Abstract: In a numerical control system including a plurality of data communication apparatuses and a numerical controller that transmits and receives data to and from the data communication apparatuses, a filter circuit is removably attached to each of a connection unit of the numerical controller and connection units of the data communication apparatuses. By detecting an error information based on a data transfer error or the sign of the data transfer error, a filter circuit that needs to be replaced is specified. Thus, the noise immunity of only a required portion of the filter circuits is increased, as a result, it is possible to suppress the cost for noise reduction while increasing the noise immunity of the entire system.

    Abstract translation: 在包括多个数据通信设备和数据控制器的数字控制系统中，数据控制器向数据通信设备发送数据和从数据通信设备接收数据，滤波器电路可移除地附接到数字控制器的连接单元和连接单元 数据通信装置。 通过基于数据传输错误或数据传输错误的符号检测错误信息，指定需要更换的滤波器电路。 因此，仅增加滤波电路的所需部分的抗噪声能力，结果，可以在提高整个系统的抗噪声性的同时抑制噪声降低的成本。

    Interleaved phase sector based RF signal decimation
    36.
    发明授权
    Interleaved phase sector based RF signal decimation 有权
    基于交错相位扇区的RF信号抽取

    公开(公告)号：US09100181B2

    公开(公告)日：2015-08-04

    申请号：US13830092

    申请日：2013-03-14

    Applicant: Innoventure L.P.

    Inventor： David K. Nienaber

    IPC: H04B1/38 ,  H04L5/16 ,  H04L1/20 ,  H04B1/06

    CPC classification number: H04L1/206 ,  G01R23/167 ,  H03D1/00 ,  H03D2200/006 ,  H03D2200/0062 ,  H04B1/0021 ,  H04B1/06 ,  H04B2001/0491 ,  H04L1/08

    Abstract: Values representative of modulation signal components are extracted from a modulated signal. The modulated signal contains a modulation signal. A local clock signal is developed which correlates in time to the modulated signal and has a plurality of non-overlapping phase sectors per cycle. Signal values are acquired from the modulated signal, separately for at least one phase sector of one cycle of the local clock signal. At least two signal values from the same local clock cycle, but different phase sectors are combined to obtain at least one combined signal value representative of a modulation signal component.

    Abstract translation: 从调制信号中提取表示调制信号分量的值。 调制信号包含调制信号。 开发本地时钟信号，其在时间上与调制信号相关，并且每个周期具有多个非重叠相位扇区。 对于本地时钟信号的一个周期的至少一个相位扇区，从调制信号获取信号值。 来自相同本地时钟周期，但是不同相位扇区的至少两个信号值被组合以获得表示调制信号分量的至少一个组合信号值。

    Blind mechanism for estimation and correction of I/Q impairments
    37.
    发明授权
    Blind mechanism for estimation and correction of I/Q impairments 有权
    用于估计和校正I / Q损伤的盲机制

    公开(公告)号：US09065609B2

    公开(公告)日：2015-06-23

    申请号：US13942065

    申请日：2013-07-15

    Applicant: National Instruments Corporation

    Inventor： James W. McCoy

    IPC: H03D1/04 ,  H04L1/00 ,  H04L25/06

    CPC classification number: H04L1/0038 ,  H04L1/206 ,  H04L25/06 ,  H04L25/067 ,  H04L27/3863 ,  H04L27/3872

    Abstract: A mechanism for blind estimation of parameters for correcting I/Q impairments. Complex samples of a complex baseband signal are received from a receiver. A cross-correlation is computed between an I component and a Q component of the complex samples. A mean square value is computed for the I component of the complex samples; and a mean square value is computed for the Q component of the complex samples. A cross-channel gain estimate is: computed based on the cross-correlation value and one or both of the mean square values; and used to apply a cross-channel gain correction to the complex samples. An estimate of an I/Q gain imbalance is computed based on the mean square values. The gain imbalance estimate is useable to correct an I/Q gain imbalance present in the complex samples. The parameters may be supplied to the receiver, enabling the receiver to apply online corrections.

    Abstract translation: 用于盲目估计用于校正I / Q损伤的参数的机制。 从接收机接收复基带信号的复样本。 在复数样本的I分量和Q分量之间计算互相关。 为复数样本的I分量计算均方根值; 并且对于复数样本的Q分量计算均方根值。 跨渠道增益估计是：基于互相关值和均方值的一个或两个来计算; 并用于对复杂样本应用跨通道增益校正。 基于均方根值计算I / Q增益不平衡的估计。 增益不平衡估计可用于校正复杂样本中存在的I / Q增益失衡。 这些参数可以提供给接收机，使得接收机可以应用在线校正。

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