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公开(公告)号：US20070002987A1
公开(公告)日：2007-01-04
申请号：US11170391
申请日：2005-06-29
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Gallagher , Sheldon Gilbert , Stephen Pollmann , Frederick Price , Blaine Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Gallagher , Sheldon Gilbert , Stephen Pollmann , Frederick Price , Blaine Readler , John Wiss , Eli Arviv
IPC分类号： H04L7/00
摘要： Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 用于在通信链路上同步一个或多个时钟的装置，系统和方法。 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 通过相关采样序列指示的同步信号接收时间可以通过围绕最佳相关样本内插相关采样序列来精细化，以便以小于样本分辨率的插值分辨率定位最佳内插。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 在初始化之后，优选地累积所有从时钟错误以防止从机和主时钟之间的长期滑动。 通过通信链路同步的以前独立的主，从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较，然后可以通过调整二次独立时钟来与其独立时钟相同的差异 本地非通用时钟作为链路另一侧的辅助时钟源自其本地非通用时钟。
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公开(公告)号：US06944188B2
公开(公告)日：2005-09-13
申请号：US09790443
申请日：2001-02-21
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Ell Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Ell Arviv
摘要： Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 用于在通信链路上同步一个或多个时钟的装置，系统和方法。 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 通过相关采样序列指示的同步信号接收时间可以通过围绕最佳相关样本内插相关采样序列来精细化，以便以小于样本分辨率的插值分辨率来定位最佳内插。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 在初始化之后，优选地累积所有从时钟错误以防止从机和主时钟之间的长期滑动。 通过通信链路同步的以前独立的主，从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较，然后可以通过调整二次独立时钟来与其独立时钟相同的差异 本地非通用时钟作为链路另一侧的辅助时钟源自其本地非通用时钟。
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公开(公告)号：US08199779B2
公开(公告)日：2012-06-12
申请号：US13021627
申请日：2011-02-04
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
摘要： Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 用于在通信链路上同步一个或多个时钟的装置，系统和方法。 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 通过相关采样序列指示的同步信号接收时间可以通过围绕最佳相关样本内插相关采样序列来精细化，以便以小于样本分辨率的插值分辨率定位最佳内插。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 在初始化之后，优选地累积所有从时钟错误以防止从机和主时钟之间的长期滑动。 通过通信链路同步的以前独立的主，从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较，然后可以通过调整二次独立时钟来与其独立时钟相同的差异 本地非通用时钟作为链路另一侧的辅助时钟源自其本地非通用时钟。
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公开(公告)号：US07583705B2
公开(公告)日：2009-09-01
申请号：US11170391
申请日：2005-06-29
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
摘要： One or more clocks are synchronized across a communication link using a synchronization signal sent from a master to a slave clock. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate. The synchronization signal receipt time is compared to the expected time and the slave clock is adjusted until the times match. Master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks. The secondary independent clocks may be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 使用从主机发送到从时钟的同步信号，通过通信链路同步一个或多个时钟。 同步信号可以是以从站所预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生第一采样率的相关采样序列。 将同步信号接收时间与预期时间进行比较，并调整从时钟直到时间匹配。 通过通信链路同步的主和从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较。 辅助独立时钟可以通过调整一个来独立同步，以使其与本地非常见时钟具有相同的差异，因为链路另一侧的辅助时钟与其本地非常见时钟相同。
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公开(公告)号：US20060072656A1
公开(公告)日：2006-04-06
申请号：US10956292
申请日：2004-10-01
申请人： John Wiss , Timothy Blalock
发明人： John Wiss , Timothy Blalock
CPC分类号： H04L1/20 , H04B17/336
摘要： The signal-to-noise ratio of a demodulated received signal is estimated by measuring the error vector magnitude (EVM) of the demodulated signal; and processing the measured EVM in combination with a correction term to estimate the signal-to-noise ratio of the demodulated signal. The correction term is a polynomial function of the measured EVM. The signal-to-noise ratio is estimated in accordance with the formula: E S N 0 ≅ 10 · LOG 10 ( π · ⌈ E S ⌉ 4 [ μ ^ z + C ( μ ^ z ) ] 2 ) ( dB ) wherein {circumflex over (μ)}z is the measured EVM based on the mean of a Rayleigh density of EVM measurements; and C is the correction term. For QPSK modulated signals, C is calculated in accordance with the formula: CQPSK({circumflex over (μ)}z)≅2.71×10−3{circumflex over (μ)}z3−7.54×10−2{circumflex over (μ)}z2+0.7{circumflex over (μ)}z−2.25 For BPSK modulated signals, C is calculated in accordance with the formula: CBPSK({circumflex over (μ)}z)≅1.78×10−4{circumflex over (μ)}z3−1.03×10−3{circumflex over (μ)}z2+4.62×10−2{circumflex over (μ)}z−0.588
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公开(公告)号：US20110122981A1
公开(公告)日：2011-05-26
申请号：US13021627
申请日：2011-02-04
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
IPC分类号： H04L7/00
摘要： Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 用于在通信链路上同步一个或多个时钟的装置，系统和方法。 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 通过相关采样序列指示的同步信号接收时间可以通过围绕最佳相关样本内插相关采样序列来精细化，以便以小于样本分辨率的插值分辨率定位最佳内插。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 在初始化之后，优选地累积所有从时钟错误以防止从机和主时钟之间的长期滑动。 通过通信链路同步的以前独立的主，从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较，然后可以通过调整二次独立时钟来与其独立时钟相同的差异 本地非通用时钟作为链路另一侧的辅助时钟源自其本地非通用时钟。
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公开(公告)号：US07907640B2
公开(公告)日：2011-03-15
申请号：US12508431
申请日：2009-07-23
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
摘要： A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. A best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output.
摘要翻译： 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。
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公开(公告)号：US20090279652A1
公开(公告)日：2009-11-12
申请号：US12508431
申请日：2009-07-23
申请人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
发明人： Pranesh Sinha , Sharon Akler , Yair Bourlas , Timothy Leo Gallagher , Sheldon L. Gilbert , Stephen C. Pollmann , Frederick W. Price , Blaine C. Readler , John Wiss , Eli Arviv
IPC分类号： H04L7/00
摘要： Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock.
摘要翻译： 用于在通信链路上同步一个或多个时钟的装置，系统和方法。 从时钟可以通过从主机发送到链路的从时钟侧的同步信号与主时钟同步。 同步信号可以是以从机侧预期的间隔发送的预期信号模式。 从时钟可以将接收的信号与预期同步信号的表示相关，以产生与从时钟速率的n倍相关的第一采样率的相关采样序列。 通过相关采样序列指示的同步信号接收时间可以通过围绕最佳相关样本内插相关采样序列来精细化，以便以小于样本分辨率的插值分辨率定位最佳内插。 可以通过在与最佳内插输出相邻的内插器输出之间进行估计来进一步改进最佳内插。 将这样确定的同步信号接收时间与基于从时钟的预期时间进行比较，该从时钟被调整直到时间匹配。 在初始化之后，优选地累积所有从时钟错误以防止从机和主时钟之间的长期滑动。 通过通信链路同步的以前独立的主，从时钟构成了一个非常见的时钟，可以在链路的每一侧与次级独立时钟进行比较，然后可以通过调整二次独立时钟来与其独立时钟相同的差异 本地非通用时钟作为链路另一侧的辅助时钟源自其本地非通用时钟。
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