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。

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。

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。

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

IPC: H04L7/033 ,  H04L7/00 ,  H03M1/12

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。