公开(公告)号：US20090279418A1

公开(公告)日：2009-11-12

申请号：US12416027

申请日：2009-03-31

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H04J13/00 ,  H04J11/00

CPC分类号： H04L27/2627 ,  H04L5/0007 ,  H04L5/0028 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/183 ,  H04L27/2053 ,  H04L27/2071 ,  H04L27/3488 ,  H04L2025/03401 ,  H04L2025/03414

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by modulating existing data carriers with a phase and an amplitude offset. In exemplary embodiments of the present invention, additional data capacity can be achieved for an COFDM signal which is completely backwards compatible with existing satellite broadcast communications systems. In exemplary embodiments of the present invention additional information can be overlayed on an existing signal as a combination of amplitude and phase offset from the original QPSK symbols, applied for each information bit of the overlay data. With two additional levels of modulation, a receiver can demodulate the information from each of the previous stages and combine the information into a suitable format for soft decoding. The first stage of demodulation will be recovery of overlay data from the amplitude modulated D8PSK. Because other amplitude variations due to multi-path are also expected, the data gathered from the FFT in the receiver must be equalized to the channel conditions. After channel equalization has been performed, soft overlay data can then be derived from the distance off the unit circle. In order to recover the phase modulated overlay data, the equalized symbols must first be differentially demodulated and corrected for any common phase error offset. After common phase removal, overlay phase information can be obtained.

摘要翻译： 提出了系统和方法，用于通过调制具有相位和幅度偏移的现有数据载波来传输先前存在的差分COFDM信号的附加数据。 在本发明的示例性实施例中，可以实现与现有卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。 在本发明的示例性实施例中，作为叠加数据的每个信息比特的原始QPSK符号的幅度和相位偏移的组合，附加信息可以叠加在现有信号上。 通过两个附加的调制级别，接收机可以解调来自每个先前阶段的信息，并将该信息组合成用于软解码的适当格式。 解调的第一阶段将是从幅度调制的D8PSK恢复覆盖数据。 由于也预期由于多路径引起的其他幅度变化，所以从接收机中从FFT收集的数据必须与信道条件相等。 在执行信道均衡之后，可以从距离单位圆的距离导出软覆盖数据。 为了恢复相位调制覆盖数据，必须首先对均衡的符号进行差分解调并校正任何公共相位误差偏移。 共相除去后，可以获得覆盖相位信息。

公开(公告)号：US09473335B2

公开(公告)日：2016-10-18

申请号：US13456850

申请日：2012-05-11

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H04L27/32 ,  H04L27/04 ,  H04L27/26 ,  H04L27/34

CPC分类号： H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by changing the amplitude of the legacy data symbols. In exemplary embodiments of the present invention, additional data capacity can be achieved for a COFDM signal which is completely backwards compatible with existing legacy satellite broadcast communications systems. In exemplary embodiments of the present invention, additional information can be overlaid on a legacy COFDM signal by applying an amplitude offset to the legacy symbols. In exemplary embodiments of the present invention, special receiver processing can be implemented to extract this additional information, which can include performing channel equalization across frequency bins to isolate the amplitude modulated overlay signal. For example, at each FFT symbol time, average power across neighboring active data bins can be used to determine the localized power at the corresponding FFT bins, and a channel inversion can then, for example, be performed on the data bins to restore, as best as possible, the original transmitted symbol amplitude.

摘要翻译： 提出了系统和方法，用于通过改变传统数据符号的幅度来传输先前存在的差分COFDM信号的附加数据。 在本发明的示例性实施例中，可以实现与现有传统卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。 在本发明的示例性实施例中，通过对遗留符号应用振幅偏移，附加信息可以覆盖在传统COFDM信号上。 在本发明的示例性实施例中，可以实现特殊的接收机处理以提取该附加信息，该附加信息可以包括在频率仓之间执行信道均衡以隔离调幅叠加信号。 例如，在每个FFT符号时间，可以使用相邻的活动数据箱之间的平均功率来确定相应FFT仓上的局部功率，然后可以例如对数据仓进行信道反转以恢复，如 最好尽可能的，原来传输的符号幅度。

公开(公告)号：US08306145B2

公开(公告)日：2012-11-06

申请号：US12416027

申请日：2009-03-31

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H04L27/10

CPC分类号： H04L27/2627 ,  H04L5/0007 ,  H04L5/0028 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/183 ,  H04L27/2053 ,  H04L27/2071 ,  H04L27/3488 ,  H04L2025/03401 ,  H04L2025/03414

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by modulating existing data carriers with a phase and an amplitude offset. In exemplary embodiments of the present invention, additional data capacity can be achieved for an COFDM signal which is completely backwards compatible with existing satellite broadcast communications systems. In exemplary embodiments of the present invention additional information can be overlayed on an existing signal as a combination of amplitude and phase offset from the original QPSK symbols, applied for each information bit of the overlay data. With two additional levels of modulation, a receiver can demodulate the information from each of the previous stages and combine the information into a suitable format for soft decoding. The first stage of demodulation will be recovery of overlay data from the amplitude modulated D8PSK. Because other amplitude variations due to multi-path are also expected, the data gathered from the FFT in the receiver must be equalized to the channel conditions. After channel equalization has been performed, soft overlay data can then be derived from the distance off the unit circle. In order to recover the phase modulated overlay data, the equalized symbols must first be differentially demodulated and corrected for any common phase error offset. After common phase removal, overlay phase information can be obtained.

摘要翻译： 提出了系统和方法，用于通过调制具有相位和幅度偏移的现有数据载波来传输先前存在的差分COFDM信号的附加数据。 在本发明的示例性实施例中，可以实现与现有卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。 在本发明的示例性实施例中，作为叠加数据的每个信息比特的原始QPSK符号的幅度和相位偏移的组合，附加信息可以叠加在现有信号上。 通过两个附加的调制级别，接收机可以解调来自每个先前阶段的信息，并将该信息组合成用于软解码的适当格式。 解调的第一阶段将是从幅度调制的D8PSK恢复覆盖数据。 由于也预期由于多路径引起的其他幅度变化，所以从接收机中从FFT收集的数据必须与信道条件相等。 在执行信道均衡之后，可以从距离单位圆的距离导出软覆盖数据。 为了恢复相位调制覆盖数据，必须首先对均衡的符号进行差分解调并校正任何公共相位误差偏移。 共相除去后，可以获得覆盖相位信息。

公开(公告)号：US20130215984A1

公开(公告)日：2013-08-22

申请号：US13456850

申请日：2012-05-11

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H04L27/04

CPC分类号： H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by changing the amplitude of the legacy data symbols. In exemplary embodiments of the present invention, additional data capacity can be achieved for a COFDM signal which is completely backwards compatible with existing legacy satellite broadcast communications systems. In exemplary embodiments of the present invention, additional information can be overlaid on a legacy COFDM signal by applying an amplitude offset to the legacy symbols. In exemplary embodiments of the present invention, special receiver processing can be implemented to extract this additional information, which can include performing channel equalization across frequency bins to isolate the amplitude modulated overlay signal. For example, at each FFT symbol time, average power across neighboring active data bins can be used to determine the localized power at the corresponding FFT bins, and a channel inversion can then, for example, be performed on the data bins to restore, as best as possible, the original transmitted symbol amplitude.

公开(公告)号：US08184743B2

公开(公告)日：2012-05-22

申请号：US12184659

申请日：2008-08-01

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H03K9/00

CPC分类号： H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by changing the amplitude of the legacy data symbols. In exemplary embodiments of the present invention, additional data capacity can be achieved for a COFDM signal which is completely backwards compatible with existing legacy satellite broadcast communications systems. In exemplary embodiments of the present invention, additional information can be overlaid on a legacy COFDM signal by applying an amplitude offset to the legacy symbols. In exemplary embodiments of the present invention, special receiver processing can be implemented to extract this additional information, which can include performing channel equalization across frequency bins to isolate the amplitude modulated overlay signal. For example, at each FFT symbol time, average power across neighboring active data bins can be used to determine the localized power at the corresponding FFT bins, and a channel inversion can then, for example, be performed on the data bins to restore, as best as possible, the original transmitted symbol amplitude.

摘要翻译： 提出了系统和方法，用于通过改变传统数据符号的幅度来传输先前存在的差分COFDM信号的附加数据。 在本发明的示例性实施例中，可以实现与现有传统卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。 在本发明的示例性实施例中，通过对遗留符号应用振幅偏移，附加信息可以覆盖在传统COFDM信号上。 在本发明的示例性实施例中，可以实现特殊的接收机处理以提取该附加信息，该附加信息可以包括在频率仓之间执行信道均衡以隔离调幅叠加信号。 例如，在每个FFT符号时间，可以使用相邻的活动数据箱之间的平均功率来确定相应FFT仓上的局部功率，然后可以例如对数据仓进行信道反转以恢复，如 最好尽可能的，原来传输的符号幅度。

公开(公告)号：US20090161777A1

公开(公告)日：2009-06-25

申请号：US12184659

申请日：2008-08-01

申请人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

发明人： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC分类号： H04L27/28

CPC分类号： H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by changing the amplitude of the legacy data symbols. In exemplary embodiments of the present invention, additional data capacity can be achieved for a COFDM signal which is completely backwards compatible with existing legacy satellite broadcast communications systems. In exemplary embodiments of the present invention, additional information can be overlaid on a legacy COFDM signal by applying an amplitude offset to the legacy symbols. In exemplary embodiments of the present invention, special receiver processing can be implemented to extract this additional information, which can include performing channel equalization across frequency bins to isolate the amplitude modulated overlay signal. For example, at each FFT symbol time, average power across neighboring active data bins can be used to determine the localized power at the corresponding FFT bins, and a channel inversion can then, for example, be performed on the data bins to restore, as best as possible, the original transmitted symbol amplitude.

摘要翻译： 提出了系统和方法，用于通过改变传统数据符号的幅度来传输先前存在的差分COFDM信号的附加数据。 在本发明的示例性实施例中，可以实现与现有传统卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。 在本发明的示例性实施例中，通过对遗留符号应用振幅偏移，附加信息可以覆盖在传统COFDM信号上。 在本发明的示例性实施例中，可以实现特殊的接收机处理以提取该附加信息，该附加信息可以包括在频率仓之间执行信道均衡以隔离调幅叠加信号。 例如，在每个FFT符号时间，可以使用相邻的活动数据箱之间的平均功率来确定相应FFT仓上的局部功率，然后可以例如对数据仓进行信道反转以恢复，如 最好尽可能的，原来传输的符号幅度。

公开(公告)号：US08391132B2

公开(公告)日：2013-03-05

申请号：US12415648

申请日：2009-03-31

申请人： Carl Scarpa ,  Christopher Strolle

发明人： Carl Scarpa ,  Christopher Strolle

IPC分类号： H04J11/00 ,  H04W4/00 ,  H04B7/02

CPC分类号： H04L27/2627 ,  H04B7/0671 ,  H04B7/12 ,  H04L5/0017 ,  H04L27/2602

摘要： Systems and methods are presented for improving the ability to withstand slow speed mute via diversity transmission while avoiding loss in link level margin. In exemplary embodiments of the present invention, systems and methods are presented for improving resistance to slow speed muting by employing transmit diversity where a second signal is not a replica of the original signal. The second signal can be generated, for example, by using only a COFDM FFT bin that contained the cluster sync bit while setting all other bins to zero. That is, only the spectral portion of interest of the COFDM signal need be utilized. In such exemplary embodiments, the same frequency and time delay offset can be used as in current systems and methods, except that the replica COFDM signal can, for example, consist of only one populated FFT bin.

摘要翻译： 提出了系统和方法，以提高通过分集传输来承受慢速静音的能力，同时避免链路水平裕度的损失。 在本发明的示例性实施例中，提出了用于通过采用发射分集来提高对慢速静音的抵抗力的系统和方法，其中第二信号不是原始信号的复制品。 例如，可以通过仅使用包含集群同步位的COFDM FFT仓而将所有其他箱设置为零来生成第二信号。 也就是说，仅需要利用COFDM信号的感兴趣的频谱部分。 在这样的示例性实施例中，可以使用与当前系统和方法相同的频率和时间延迟偏移，除了复制COFDM信号可以例如仅由一个填充的FFT仓组成。

公开(公告)号：US07742750B2

公开(公告)日：2010-06-22

申请号：US11607383

申请日：2006-12-01

申请人： Carl Scarpa ,  Sharif Sazzad ,  Christopher Strolle

发明人： Carl Scarpa ,  Sharif Sazzad ,  Christopher Strolle

IPC分类号： H04B1/06

CPC分类号： H04B7/0871 ,  H04B7/0868

摘要： Systems and methods are presented for digital antenna diversity combining. In exemplary embodiments of the present invention, at least two antenna signal paths can be communicably connected to a receiver. Each antenna signal path can be provided with an RF tuner communicably connected to a demodulator, which can estimate the signal to noise ratio (SNR) and time of arrival of its respective antenna signal. In exemplary embodiments of the present invention, a time alignment circuit can be communicably connected to each antenna signal path, and a maximum ratio combiner can be communicably connected to the time alignment circuit. In operation, the time alignment circuit can use the time of arrival estimate to align the multiple signals and the maximum ratio combiner can use the SNR estimate obtained for each antenna signal to respectively weight each signal and thereby generate a combined output signal. In exemplary embodiments of the present invention, a switch diversity combiner can be further provided, and can quickly detect when an antenna signal is entering a fade, allowing the maximum ratio combiner to set that signal's weight to zero. In exemplary embodiments of the present invention, a digital diversity combiner can be provided in a stand alone integrated circuit, or can be integrated in a larger integrated circuit, such as, for example, a satellite radio overlay processor.

摘要翻译： 提出了数字天线分集组合的系统和方法。 在本发明的示例性实施例中，至少两个天线信号路径可以可通信地连接到接收器。 每个天线信号路径可以设置有可通信地连接到解调器的RF调谐器，其可以估计其相应天线信号的信噪比（SNR）和到达时间。 在本发明的示例性实施例中，时间对准电路可以可通信地连接到每个天线信号路径，并且最大比率组合器可以可通信地连接到时间对准电路。 在操作中，时间对准电路可以使用到达时间估计来对准多个信号，并且最大比组合器可以使用为每个天线信号获得的SNR估计来分别对每个信号加权，从而生成组合的输出信号。 在本发明的示例性实施例中，可以进一步提供开关分集组合器，并且可以快速地检测天线信号何时进入衰落，允许最大比组合器将该信号的权重设置为零。 在本发明的示例性实施例中，数字分集组合器可以设置在独立集成电路中，或者可以集成在诸如卫星无线电覆盖处理器之类的较大集成电路中。

公开(公告)号：US20090245087A1

公开(公告)日：2009-10-01

申请号：US12415648

申请日：2009-03-31

申请人： Carl Scarpa ,  Christopher Strolle

发明人： Carl Scarpa ,  Christopher Strolle

IPC分类号： H04J11/00

CPC分类号： H04L27/2627 ,  H04B7/0671 ,  H04B7/12 ,  H04L5/0017 ,  H04L27/2602

摘要： Systems and methods are presented for improving the ability to withstand slow speed mute via diversity transmission while avoiding loss in link level margin. In exemplary embodiments of the present invention, systems and methods are presented for improving resistance to slow speed muting by employing transmit diversity where a second signal is not a replica of the original signal. The second signal can be generated, for example, by using only a COFDM FFT bin that contained the cluster sync bit while setting all other bins to zero. That is, only the spectral portion of interest of the COFDM signal need be utilized. In such exemplary embodiments, the same frequency and time delay offset can be used as in current systems and methods, except that the replica COFDM signal can, for example, consist of only one populated FFT bin.

摘要翻译： 提出了系统和方法，以提高通过分集传输来承受慢速静音的能力，同时避免链路水平裕度的损失。 在本发明的示例性实施例中，提出了用于通过采用发射分集来提高对慢速静音的抵抗力的系统和方法，其中第二信号不是原始信号的复制品。 例如，可以通过仅使用包含集群同步位的COFDM FFT仓而将所有其他箱设置为零来生成第二信号。 也就是说，仅需要利用COFDM信号的感兴趣的频谱部分。 在这样的示例性实施例中，可以使用与当前系统和方法相同的频率和时间延迟偏移，除了复制COFDM信号可以例如仅由一个填充的FFT仓组成。

公开(公告)号：US20070142009A1

公开(公告)日：2007-06-21

申请号：US11607383

申请日：2006-12-01

申请人： Carl Scarpa ,  Sharif Sazzad ,  Christopher Strolle

发明人： Carl Scarpa ,  Sharif Sazzad ,  Christopher Strolle

IPC分类号： H04B7/08 ,  H04B1/06

CPC分类号： H04B7/0871 ,  H04B7/0868

摘要： Systems and methods are presented for digital antenna diversity combining. In exemplary embodiments of the present invention, at least two antenna signal paths can be communicably connected to a receiver. Each antenna signal path can be provided with an RF tuner communicably connected to a demodulator, which can estimate the signal to noise ratio (SNR) and time of arrival of its respective antenna signal. In exemplary embodiments of the present invention, a time alignment circuit can be communicably connected to each antenna signal path, and a maximum ratio combiner can be communicably connected to the time alignment circuit. In operation, the time alignment circuit can use the time of arrival estimate to align the multiple signals and the maximum ratio combiner can use the SNR estimate obtained for each antenna signal to respectively weight each signal and thereby generate a combined output signal. In exemplary embodiments of the present invention, a switch diversity combiner can be further provided, and can quickly detect when an antenna signal is entering a fade, allowing the maximum ratio combiner to set that signal's weight to zero. In exemplary embodiments of the present invention, a digital diversity combiner can be provided in a stand alone integrated circuit, or can be integrated in a larger integrated circuit, such as, for example, a satellite radio overlay processor.

摘要翻译： 提出了数字天线分集组合的系统和方法。 在本发明的示例性实施例中，至少两个天线信号路径可以可通信地连接到接收器。 每个天线信号路径可以设置有可通信地连接到解调器的RF调谐器，其可以估计其相应天线信号的信噪比（SNR）和到达时间。 在本发明的示例性实施例中，时间对准电路可以可通信地连接到每个天线信号路径，并且最大比率组合器可以可通信地连接到时间对准电路。 在操作中，时间对准电路可以使用到达时间估计来对准多个信号，并且最大比组合器可以使用为每个天线信号获得的SNR估计来分别对每个信号加权，从而生成组合的输出信号。 在本发明的示例性实施例中，可以进一步提供开关分集组合器，并且可以快速检测何时天线信号进入衰落，允许最大比组合器将该信号的权重设置为零。 在本发明的示例性实施例中，数字分集组合器可以设置在独立集成电路中，或者可以集成在诸如卫星无线电覆盖处理器之类的较大集成电路中。