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公开(公告)号：US09667390B2
公开(公告)日：2017-05-30
申请号：US14255046
申请日：2014-04-17
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： I. Zakir Ahmed , Craig E. Rupp , Ramanujeya Lakshminarayan Narahari
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.
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2.发明授权公开(公告)号：US08934595B2
公开(公告)日：2015-01-13
申请号：US14156202
申请日：2014-01-15
Applicant: National Instruments Corporation
Inventor： I. Zakir Ahmed , Krishna Bharadwaj , Ramesh Krishnan , Vijaya Yajnanarayana
CPC classification number: H04L7/033 , H03M1/1255 , H04L7/0087
Abstract: A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/TS′ of a receiver and an intended sample clock rate 1/TS. The receiver captures samples of a received baseband signal at the rate 1/TS′, operates on the captured samples to generate an estimate for the clock rate offset, and fractionally resamples the captured samples using the clock rate offset. The resampled data represents an estimate of baseband symbols transmitted by the transmitter. The action of operating on the captured samples involves computing an error vector signal and then estimating the clock rate offset using the error vector signal. The error vector signal may be computed in different ways depending on whether or not carrier frequency offset and carrier phase offset are assumed to be present in the received baseband signal.
Abstract translation: 用于操作接收机以便估计接收机的实际采样时钟速率1 / TS'与预期采样时钟速率1 / TS之间的偏移的低复杂度系统和方法。 接收机以速率1 / TS'捕获接收到的基带信号的采样，对捕获的采样进行操作，以产生时钟偏移量的估计，并且使用时钟速率偏移对所捕获的采样进行分数重新采样。 重采样的数据表示由发射机发射的基带符号的估计。 在捕获的样本上操作的动作包括计算误差矢量信号，然后使用误差矢量信号估计时钟偏移。 取决于载波频率偏移和载波相位偏移是否被假设为存在于接收基带信号中，可以以不同的方式计算误差向量信号。
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公开(公告)号：US09332450B2
公开(公告)日：2016-05-03
申请号：US14630923
申请日：2015-02-25
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： Craig E. Rupp , Gerardo Orozco Valdes , I. Zakir Ahmed , Vijaya Yajnanarayana
Abstract: Method and system for a test process. The method may include performing tests on one or more units under test (UUTs). At least one test on one or more UUTs may be performed. A signal may be acquired from the UUT. A reference signal may be retrieved. The reference signal may be derived from a transmitted signal characteristic of the UUT. The signal may be analyzed with respect to the reference signal. Results, useable to characterize the one or more UUTs, from performing the at least one test on the one or more UUTs may be stored. The reference signal may be derived from an initial test and may be stored for subsequent retrieval. A respective reference signal may be retrieved for all UUTs of the one or more UUTs for a respective test. The signal may be a radio frequency signal. The UUT may be a wireless mobile device.
Abstract translation: 测试过程的方法和系统。 该方法可以包括对被测试的一个或多个单元（UUT）执行测试。 可以对一个或多个UUT进行至少一次测试。 可以从UUT获取信号。 可以检索参考信号。 参考信号可以从UUT的发射信号特征导出。 可以相对于参考信号来分析信号。 可以存储用于表征所述一个或多个UUT的结果，以对所述一个或多个UUT执行所述至少一个测试。 参考信号可以从初始测试导出，并且可以被存储用于随后的检索。 可针对相应测试的一个或多个UUT的所有UUT检索相应的参考信号。 信号可以是射频信号。 UUT可以是无线移动设备。
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Patent Agency Ranking
4.发明申请公开(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
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。
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公开(公告)号：US20150172943A1
公开(公告)日：2015-06-18
申请号：US14630923
申请日：2015-02-25
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： Craig E. Rupp , Gerardo Orozco Valdes , I. Zakir Ahmed , Vijaya Yajnanarayana
IPC: H04W24/08
Abstract: Method and system for a test process. The method may include performing tests on one or more units under test (UUTs). At least one test on one or more UUTs may be performed. A signal may be acquired from the UUT. A reference signal may be retrieved. The reference signal may be derived from a transmitted signal characteristic of the UUT. The signal may be analyzed with respect to the reference signal. Results, useable to characterize the one or more UUTs, from performing the at least one test on the one or more UUTs may be stored. The reference signal may be derived from an initial test and may be stored for subsequent retrieval. A respective reference signal may be retrieved for all UUTs of the one or more UUTs for a respective test. The signal may be a radio frequency signal. The UUT may be a wireless mobile device.
Abstract translation: 测试过程的方法和系统。 该方法可以包括对被测试的一个或多个单元（UUT）执行测试。 可以对一个或多个UUT进行至少一次测试。 可以从UUT获取信号。 可以检索参考信号。 参考信号可以从UUT的发射信号特征导出。 可以相对于参考信号来分析信号。 可以存储用于表征所述一个或多个UUT的结果，以对所述一个或多个UUT执行所述至少一个测试。 参考信号可以从初始测试导出，并且可以被存储用于随后的检索。 可针对相应测试的一个或多个UUT的所有UUT检索相应的参考信号。 信号可以是射频信号。 UUT可以是无线移动设备。
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6.发明申请公开(公告)号：US20140126676A1
公开(公告)日：2014-05-08
申请号：US14156202
申请日：2014-01-15
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： I. Zakir Ahmed , Krishna Bharadwaj , Ramesh Krishnan , Vijaya Yajnanarayana
IPC: H04L7/033
CPC classification number: H04L7/033 , H03M1/1255 , H04L7/0087
Abstract: A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/TS′ of a receiver and an intended sample clock rate 1/TS. The receiver captures samples of a received baseband signal at the rate 1/TS′, operates on the captured samples to generate an estimate for the clock rate offset, and fractionally resamples the captured samples using the clock rate offset. The resampled data represents an estimate of baseband symbols transmitted by the transmitter. The action of operating on the captured samples involves computing an error vector signal and then estimating the clock rate offset using the error vector signal. The error vector signal may be computed in different ways depending on whether or not carrier frequency offset and carrier phase offset are assumed to be present in the received baseband signal.
Abstract translation: 用于操作接收机以便估计接收机的实际采样时钟速率1 / TS'与预期采样时钟速率1 / TS之间的偏移的低复杂度系统和方法。 接收机以速率1 / TS'捕获接收到的基带信号的采样，对捕获的采样进行操作，以产生时钟偏移量的估计，并且使用时钟速率偏移对所捕获的采样进行分数重新采样。 重采样的数据表示由发射机发射的基带符号的估计。 在捕获的样本上操作的动作包括计算误差矢量信号，然后使用误差矢量信号估计时钟偏移。 取决于载波频率偏移和载波相位偏移是否被假设为存在于接收基带信号中，可以以不同的方式计算误差向量信号。
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7.发明授权公开(公告)号：US08654903B2
公开(公告)日：2014-02-18
申请号：US13866312
申请日：2013-04-19
Applicant: National Instruments Corporation
Inventor： I. Zakir Ahmed , Krishna Bharadwaj , Ramesh Krishnan , Vijaya Yajnanarayana
IPC: H04L27/06
CPC classification number: H04L7/033 , H03M1/1255 , H04L7/0087
Abstract: A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/TS′ of a receiver and an intended sample clock rate 1/TS. The receiver captures samples of a received baseband signal at the rate 1/TS′, operates on the captured samples to generate an estimate for the clock rate offset, and fractionally resamples the captured samples using the clock rate offset. The resampled data represents an estimate of baseband symbols transmitted by the transmitter. The action of operating on the captured samples involves computing an error vector signal and then estimating the clock rate offset using the error vector signal. The error vector signal may be computed in different ways depending on whether or not carrier frequency offset and carrier phase offset are assumed to be present in the received baseband signal.
Abstract translation: 用于操作接收机以便估计接收机的实际采样时钟速率1 / TS'与预期采样时钟速率1 / TS之间的偏移的低复杂度系统和方法。 接收机以速率1 / TS'捕获接收到的基带信号的采样，对捕获的采样进行操作，以产生时钟偏移量的估计，并且使用时钟速率偏移对所捕获的采样进行分数重新采样。 重采样的数据表示由发射机发射的基带符号的估计。 在捕获的样本上操作的动作包括计算误差矢量信号，然后使用误差矢量信号估计时钟偏移。 取决于载波频率偏移和载波相位偏移是否被假设为存在于接收基带信号中，可以以不同的方式计算误差向量信号。
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8.发明申请公开(公告)号：US20130230114A1
公开(公告)日：2013-09-05
申请号：US13866312
申请日：2013-04-19
Applicant: NATIONAL INSTRUMENTS CORPORATION
Inventor： I. Zakir Ahmed , Krishna Bharadwaj , Ramesh Krishnan , Vijaya Yajnanarayana
IPC: H04L7/00
CPC classification number: H04L7/033 , H03M1/1255 , H04L7/0087
Abstract: A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/TS′ of a receiver and an intended sample clock rate 1/TS. The receiver captures samples of a received baseband signal at the rate 1/TS′, operates on the captured samples to generate an estimate for the clock rate offset, and fractionally resamples the captured samples using the clock rate offset. The resampled data represents an estimate of baseband symbols transmitted by the transmitter. The action of operating on the captured samples involves computing an error vector signal and then estimating the clock rate offset using the error vector signal. The error vector signal may be computed in different ways depending on whether or not carrier frequency offset and carrier phase offset are assumed to be present in the received baseband signal.
Abstract translation: 用于操作接收机以便估计接收机的实际采样时钟速率1 / TS'与预期采样时钟速率1 / TS之间的偏移的低复杂度系统和方法。 接收机以速率1 / TS'捕获接收到的基带信号的采样，对捕获的采样进行操作，以产生时钟偏移量的估计，并且使用时钟速率偏移对所捕获的采样进行分数重新采样。 重采样的数据表示由发射机发射的基带符号的估计。 在捕获的样本上操作的动作包括计算误差矢量信号，然后使用误差矢量信号估计时钟偏移。 取决于载波频率偏移和载波相位偏移是否被假定为存在于接收基带信号中，可以以不同的方式计算误差向量信号。
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