公开(公告)号：US11570838B2

公开(公告)日：2023-01-31

申请号：US17382061

申请日：2021-07-21

申请人： ViaSat, Inc.

发明人： Kevin Kimmich ,  Fan Mo ,  Mark Vanderaar

IPC分类号： H04W76/25 ,  H04L1/00 ,  H04N21/2383 ,  H04N21/438 ,  H04N7/18 ,  H04N21/61 ,  H04N19/46 ,  H04N19/30 ,  H04N19/115 ,  H04N19/61 ,  H04N19/162 ,  H04N19/164 ,  H04N19/89 ,  H04N19/85 ,  H04N19/66

摘要： Methods, systems, and devices are described for communicating data from multiple data terminals to an aggregator terminal over a communication link having changing link conditions. In some embodiments, source data is received at multiple data terminals, each in communication with an aggregator terminal over a communication link. For example, during a live newscast, one mobile camera may receive live video of an event from a first position while another mobile camera receives live video of the event from a second position. For various reasons (e.g., as the cameras move) each communication link may experience independently changing link conditions. Each data terminal encodes the source data (or store source data for later encoding) as a function of its respective link conditions and transmits encoded source data over its respective communication link to the aggregator terminal.

公开(公告)号：US20200267029A1

公开(公告)日：2020-08-20

申请号：US16750597

申请日：2020-01-23

申请人： VIASAT, INC.

发明人： Sameep Dave ,  Fan Mo ,  Yuri Zelensky ,  Murat Arabaci

IPC分类号： H04L25/03 ,  H04L27/01 ,  H03H21/00 ,  H03H17/06

摘要： One example includes an equalizer system. The system includes a filter system configured to receive digital sample blocks associated with an input signal and to provide equalized digital sample blocks associated with the respective digital sample blocks based on adaptive tap weights. Each of the digital sample blocks includes samples and each of the equalized digital sample blocks includes equalized samples. The system also includes a sample set selector to select a subset of equalized samples from each of the equalized digital sample blocks at the output of the filter and an error estimator configured to implement an error estimation algorithm on the subset of the equalized samples to determine a residual error associated with the equalized samples. The system further includes a tap weight generator configured to generate the adaptive tap weights in response to the residual error and to provide the adaptive tap weights to the filter.

公开(公告)号：US20200169278A1

公开(公告)日：2020-05-28

申请号：US16774697

申请日：2020-01-28

申请人： VIASAT, INC.

发明人： Murat Arabaci ,  Fan Mo ,  Daniel Kang ,  Timothy K. Gao

IPC分类号： H04B1/10 ,  H04B10/60 ,  H04B10/2507

摘要： One example includes a digital signal conditioner (DSC) system. A sample selector bank receives a digital sample block of an input signal that is provided at a supported input oversampling factor and selects a subset of samples from the digital sample block based on a selection signal. A tap weights selector bank generates a set of tap weights based on the selection signal. A filter bank receives the subset of the samples from each of the sample selectors and a respective set of tap weights. Each filter provides a weighted sample associated with the respective subset of samples and the respective set of tap weights. A reformattor receives the weighted sample from each of the filters and provides a filtered sample block including the weighted sample from a subset of the filters at an output oversampling factor for each supported input oversampling factor based on a selected supported resampling ratio.

公开(公告)号：US09112615B1

公开(公告)日：2015-08-18

申请号：US13835057

申请日：2013-03-15

申请人： ViaSat, Inc.

发明人： William Thesling ,  Fan Mo ,  Yuri Zelensky

IPC分类号： H04B10/06 ,  H04B10/61

CPC分类号： H04B10/6165

摘要： Methods, systems, and devices are described for detecting and correcting a cycle slip occurrence in a coherent receiver. Unique words are used in each received frame to detect phase changes that indicate the occurrence of a cycle slip within a frame. The location of the cycle slip is identified based on measurements made within the frame. Those measurements include phase estimation measurements and reliability measurements. A phase of a portion of the frame subsequent to the identified location of the cycle slip is adjusted to correct for the cycle slip. By combining phase estimates of symbols from both vertical and horizontal polarizations, the location of the cycle slip may be more accurately determined because the measurement windows is less susceptible to thermal noise. The phase estimates are combined by adjusting a phase of the symbols of one polarization to match a phase of the symbols of the other polarization.

摘要翻译： 描述了用于检测和校正相干接收机中的周期滑移发生的方法，系统和装置。 在每个接收的帧中使用唯一的字来检测指示帧内的周期滑移的发生的相位变化。 循环滑移的位置是根据帧内进行的测量来确定的。 这些测量包括相位估计测量和可靠性测量。 在循环滑移的识别位置之后的框架的一部分的相位被调整以校正循环滑移。 通过组合来自垂直和水平极化的符号的相位估计，可以更准确地确定周期滑移的位置，因为测量窗口不太受热噪声的影响。 通过调整一个极化的符号的相位以匹配另一个极化的符号的相位来组合相位估计。

公开(公告)号：US09112607B1

公开(公告)日：2015-08-18

申请号：US13835027

申请日：2013-03-15

申请人： ViaSat, Inc.

发明人： Sameep Dave ,  Fan Mo ,  Yuri Zelensky ,  Eric Fowlie

IPC分类号： H04B10/2513 ,  H04B10/61 ,  H04J14/00 ,  H04J14/06

CPC分类号： H04B10/2513 ,  H04B10/25133 ,  H04B10/6161 ,  H04B10/6162 ,  H04J14/002 ,  H04J14/06

摘要： Methods, systems, and devices are described for filtering data from an optical signal to compensate for chromatic dispersion in an optical path. Samples of different polarizations are filtered in the frequency domain with a matched filter by time-sharing a conversion module. The conversion module first converts a set of samples to the frequency domain for filtering when in a Fast Fourier Transform (FFT) configuration and then converts the filtered set of samples back to the time domain when in an Inverse FFT (IFFT) configuration. The size of the FFT in the FFT configuration and of the IFFT in the IFFT configuration is the same as the size of the samples being processed by the conversion module to enable both configurations to be based on a set of constant multipliers. Both configurations may be based on a pipelined architecture to sequentially process the samples in an efficient manner.

摘要翻译： 描述了用于从光信号过滤数据以补偿光路中的色散的方法，系统和装置。 通过分时转换模块，通过匹配滤波器在频域中对不同极化的样本进行滤波。 当处于快速傅里叶变换（FFT）配置中时，转换模块首先将一组采样转换为频域以进行滤波，然后当处于反FFT（IFFT）配置时将滤波后的样本组转换回时域。 FFT配置中的FFT和IFFT配置中的IFFT的大小与转换模块正在处理的样本的大小相同，以使两个配置都可以基于一组常量乘法器。 两种配置可以基于流水线架构，以有效的方式顺序处理样品。

公开(公告)号：US20140363173A1

公开(公告)日：2014-12-11

申请号：US14243720

申请日：2014-04-02

申请人： ViaSat, Inc.

发明人： Sameep Dave ,  Matthew Nimon ,  Fan Mo ,  William Thesling

IPC分类号： H04B10/2513 ,  H04L7/00 ,  H04B10/60 ,  H04L25/03 ,  H04B10/2507

CPC分类号： H04B10/25137 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/60 ,  H04B10/6971 ,  H04L7/0075 ,  H04L25/03834

摘要： Methods, systems, and devices are described for modulating and demodulating data on optical signals. During modulation, at least one stream of symbol mapped bits is filtered with at least one pulse shaping filter to reduce a bandwidth of the stream of bits and to pre-compensate for at least one identified non-ideal transmission condition. The filtered bits are modulated onto a waveform in the digital domain, and the modulated filtered bits are transmitted to digital-to-analog converter. The output of the digital-to-analog converter is converted to an optical signal. During demodulation, a received optical signal is sampled at a first sampling rate at an ADC, downsampled to a lower sampling rate for filtering, filtered with at least one discrete pulse-shaping filter, upsampled for equalization and demodulation, and then equalized and demodulated.

摘要翻译： 描述了用于调制和解调光信号数据的方法，系统和装置。 在调制期间，利用至少一个脉冲整形滤波器对符号映射比特的至少一个流进行滤波，以减少比特流的带宽并对至少一个识别的非理想传输条件进行预补偿。 滤波后的位被调制到数字域中的波形上，调制滤波后的位被传送到数模转换器。 数/模转换器的输出转换为光信号。 在解调期间，接收到的光信号在ADC处以第一采样率进行采样，下采样到较低的采样率进行滤波，用至少一个离散脉冲整形滤波器进行滤波，对采样进行均衡和解调，然后进行均衡和解调。

公开(公告)号：US11159243B2

公开(公告)日：2021-10-26

申请号：US16983226

申请日：2020-08-03

申请人： VIASAT, INC.

发明人： Murat Arabaci ,  Fan Mo ,  Sameep Dave ,  William H. Miller

IPC分类号： H04L12/28 ,  H04B10/556 ,  H04B10/54 ,  H04B10/61 ,  H04L27/38

摘要： A system and method of creating frames comprised of blocks, where each block comprises data symbols corresponding to a higher order quadrature modulation format and support symbols corresponding to a lower order modulation format. One or more of the blocks can further comprise markers comprising distinct symbol patterns. The markers can mark the start of each frame and/or another location in the frame. The support symbols can be in a common location in each block.

公开(公告)号：US11038722B2

公开(公告)日：2021-06-15

申请号：US16750597

申请日：2020-01-23

申请人： VIASAT, INC.

发明人： Sameep Dave ,  Fan Mo ,  Yuri Zelensky ,  Murat Arabaci

IPC分类号： H03H7/30 ,  H04L25/03 ,  H03H17/06 ,  H03H21/00 ,  H04L27/01

摘要： One example includes an equalizer system. The system includes a filter system configured to receive digital sample blocks associated with an input signal and to provide equalized digital sample blocks associated with the respective digital sample blocks based on adaptive tap weights. Each of the digital sample blocks includes samples and each of the equalized digital sample blocks includes equalized samples. The system also includes a sample set selector to select a subset of equalized samples from each of the equalized digital sample blocks at the output of the filter and an error estimator configured to implement an error estimation algorithm on the subset of the equalized samples to determine a residual error associated with the equalized samples. The system further includes a tap weight generator configured to generate the adaptive tap weights in response to the residual error and to provide the adaptive tap weights to the filter.

公开(公告)号：US20200092147A1

公开(公告)日：2020-03-19

申请号：US16130808

申请日：2018-09-13

申请人： Viasat, Inc.

发明人： Sameep Dave ,  Fan Mo ,  Murat Arabaci ,  Yuri Zelensky

IPC分类号： H04L27/00 ,  H04L27/38 ,  H04B10/69 ,  H04B10/079 ,  H04L1/00

摘要： A system and method of estimating metric values from digital samples of received communications signal carrying symbols modulated in a selected first modulation format and symbols modulated in a second modulation format. The selected first modulation format can be selected from among multiple supported first modulation formats. The system can receive the digital samples in sample blocks a plurality of which constitute a data frame. Each sample block can comprise a first region that contains first samples corresponding to the selected first modulation format or overhead samples regardless of the selected first modulator format or an index of the sample block in the frame; a second region that contains second samples corresponding to a second modulation format regardless of the selected first modulator format or an index of the sample block in the frame; and a third region in which whether the samples are first samples or second samples depends on the selected first modulation format or the index of the sample block in the frame. The system estimates first metrics according to the selected first modulation format for each of the first samples and second metrics according to the second modulation format for each of the second samples. The system also estimates both first metrics and second metrics for each of the third samples and then selects valid ones of the first metrics and second metrics for the third samples in accordance with the selected first modulation format or the index of the sample block in the frame.

公开(公告)号：US09287979B2

公开(公告)日：2016-03-15

申请号：US14243720

申请日：2014-04-02

申请人： ViaSat, Inc.

发明人： Sameep Dave ,  Matthew Nimon ,  Fan Mo ,  William Thesling

IPC分类号： H04B10/00 ,  H04B10/2513 ,  H04B10/516 ,  H04B10/69 ,  H04B10/2507 ,  H04B10/60 ,  H04L7/00 ,  H04L25/03

CPC分类号： H04B10/25137 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/60 ,  H04B10/6971 ,  H04L7/0075 ,  H04L25/03834

摘要： Methods, systems, and devices are described for modulating and demodulating data on optical signals. During modulation, at least one stream of symbol mapped bits is filtered with at least one pulse shaping filter to reduce a bandwidth of the stream of bits and to pre-compensate for at least one identified non-ideal transmission condition. The filtered bits are modulated onto a waveform in the digital domain, and the modulated filtered bits are transmitted to digital-to-analog converter. The output of the digital-to-analog converter is converted to an optical signal. During demodulation, a received optical signal is sampled at a first sampling rate at an ADC, downsampled to a lower sampling rate for filtering, filtered with at least one discrete pulse-shaping filter, upsampled for equalization and demodulation, and then equalized and demodulated.

摘要翻译： 描述了用于调制和解调光信号数据的方法，系统和装置。 在调制期间，利用至少一个脉冲整形滤波器对符号映射比特的至少一个流进行滤波，以减少比特流的带宽并对至少一个识别的非理想传输条件进行预补偿。 滤波后的位被调制到数字域中的波形上，调制滤波后的位被传送到数模转换器。 数/模转换器的输出转换为光信号。 在解调期间，接收到的光信号以ADC的第一采样率进行采样，下采样到较低的采样率进行滤波，用至少一个离散脉冲整形滤波器滤波，对采样进行均衡和解调，然后进行均衡和解调。