公开(公告)号：US20130166984A1

公开(公告)日：2013-06-27

申请号：US13690775

申请日：2012-11-30

Applicant: Carl Scarpa ,  Edward Schell

Inventor： Carl Scarpa ,  Edward Schell

IPC: H03M13/05

CPC classification number: H03M13/6505 ,  H03M13/05 ,  H03M13/1105 ,  H03M13/3746

Abstract: Systems and methods are presented to improve the performance of a constant bit rate iterative decoder by providing elastic buffering, while utilizing a relatively simple decoder architecture capable of maintaining a fixed number of iterations of a lower value. An LDPC decoder can be designed, for example, to support less than the maximum possible number of iterations, and can, for example, be mated to elastic input and output buffers. If a given code block, or succession of code blocks, requires the maximum number of iterations for decoding, the decoder can, for example, run at such maximum number of iterations and the elastic input buffer can, for example, hold code blocks waiting to be processed so as to maintain a constant input rate. Alternatively, if one or more code blocks requires less than the nominal number of iterations, the output buffer can store those code blocks so as to preserve a constant output rate. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, and is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract translation: 提出了系统和方法，以通过提供弹性缓冲来提高恒定比特率迭代解码器的性能，同时利用能够维持较低值的固定次数迭代的相对简单的解码器架构。 例如，LDPC解码器可以被设计为支持小于最大可能的迭代次数，并且可以例如与弹性输入和输出缓冲器配合。 如果给定代码块或连续的代码块需要用于解码的最大迭代次数，则解码器可以例如以这样的最大迭代次数运行，并且弹性输入缓冲器可以例如保持等待 进行处理以保持恒定的输入速率。 或者，如果一个或多个代码块需要小于标称的迭代次数，则输出缓冲器可以存储那些代码块，以便保持恒定的输出速率。 要强调的是，提供本摘要以符合要求抽象的规则，并提交了一项谅解，即不会将其用于解释或限制权利要求书的范围或含义。

公开(公告)号：US08184743B2

公开(公告)日：2012-05-22

申请号：US12184659

申请日：2008-08-01

Applicant: Carl Scarpa ,  Edward Schell ,  Christopher Strolle

Inventor： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC: H03K9/00

CPC classification number: H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

Abstract: 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.

Abstract translation: 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：US20100008289A1

公开(公告)日：2010-01-14

申请号：US12497339

申请日：2009-07-02

Applicant: Carl Scarpa

Inventor： Carl Scarpa

IPC: H04B7/185 ,  H04L27/38 ,  H04H20/74

CPC classification number: H04L27/22 ,  H04B1/1027 ,  H04L27/3466

Abstract: In exemplary embodiments of the present invention, a degree of hierarchical modulation can be varied as a function of satellite position, which can be related to time of day, and where such hierarchical modulation can be a combination of phase and amplitude shifts. In exemplary embodiments of the present invention, as each satellite in a multiple satellite system broadcasting to North America moves towards a D-node or an A-node position, the offset angle of a phase-based hierarchical modulation scheme can be varied. Thus, in exemplary embodiments of the present invention, the lowest satellite position in the sky can have the lowest offset angle for overlay bits, which offset angle can, for example, progressively increase as the position of the satellite in the sky increases. At a satellite's highest point in the sky, the overlay offset angle can, for example, thus be at its maximum. To aid a receiver to receive such varying overlay modulated data, the value of a varying overlay offset angle (for each satellite) can be embedded in an Overlay Identification Marker (OIM) in the bit stream broadcast by that satellite. In exemplary embodiments of the present invention each satellite broadcast receiver can thus decode each satellite's signal, knowing its respective instantaneous overlay offset angle. The receiver can then use this information to appropriately correct MRC weightings (weighting more heavily the (higher lying) satellite with the higher degree of Layer 2 modulation) before it is MRC combined across various received signal streams. Similar methods can be implemented for other overlay modulation techniques, and the method can be extended to a broadcast system using N satellites, each having a varying degree of Layer 2 modulation.

Abstract translation: 在本发明的示例性实施例中，分级调制的程度可以随卫星位置的函数而变化，这可以与时间有关，并且其中这种分层调制可以是相位和幅度相移的组合。 在本发明的示例性实施例中，由于向北美广播的多个卫星系统中的每个卫星朝向D节点或A节点位置移动，因此可以改变基于相位的分层调制方案的偏移角。 因此，在本发明的示例性实施例中，天空中最低的卫星位置可以具有覆盖比特的最低偏移角，当天空中的卫星的位置增加时，偏移角可以例如逐渐增加。 在卫星的天空最高点，覆盖偏移角例如可以达到最大值。 为了帮助接收机接收这种变化的重叠调制数据，可以将该改变的覆盖偏移角（对于每个卫星）的值嵌入在由该卫星广播的比特流中的覆盖识别标记（OIM）中。 在本发明的示例性实施例中，每个卫星广播接收机可以解码每个卫星的信号，知道其相应的瞬时覆盖偏移角。 然后，接收机可以在MRC组合在各种接收信号流之前，使用该信息来适当地校正MRC权重（用较高层次的2调制度对更高级别的卫星进行加权）。 可以对其他覆盖调制技术实现类似的方法，并且该方法可以扩展到使用N个卫星的广播系统，每个卫星具有不同程度的第2层调制。

公开(公告)号：US20090161777A1

公开(公告)日：2009-06-25

申请号：US12184659

申请日：2008-08-01

Applicant: Carl Scarpa ,  Edward Schell ,  Christopher Strolle

Inventor： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC: H04L27/28

CPC classification number: H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

Abstract: 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.

Abstract translation: 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：US07425920B2

公开(公告)日：2008-09-16

申请号：US11346643

申请日：2006-02-03

Applicant: John G. N. Henderson ,  Carl Scarpa

Inventor： John G. N. Henderson ,  Carl Scarpa

IPC: H01Q3/24

CPC classification number: H01Q1/007 ,  H01Q1/24 ,  H01Q3/2611 ,  H01Q7/005

Abstract: Antennas with steerable antenna patterns and techniques for using such antennas are described. In accordance with the invention, antenna patterns with one or more NULLs are used. Through the use of digital control signals the antenna pattern is steered so that a source of signal interference, e.g., a multipath signal, will be located in a NULL. In this manner the received signal's S/N ratio can be maximized thereby facilitating demodulation. The techniques of the invention can be applied to television, computer devices, mobile devices and a wide range of other systems. Digital commands to control an antenna may include multiple information fields, e.g., a direction field, a channel field, a gain field and a polarity field. Antennas incapable of supporting the specified fields disregard information in fields which are not supported. Information in each supported field is decoded and used to adjust the corresponding antenna characteristic.

Abstract translation: 描述了具有可导向天线方向图和使用这种天线的技术的天线。 根据本发明，使用具有一个或多个NULL的天线方向图。 通过使用数字控制信号，导航天线方向图，使得诸如多路径信号的信号干扰源将位于空值中。 以这种方式，可以使接收信号的S / N比最大化，从而便于解调。 本发明的技术可以应用于电视，计算机设备，移动设备以及各种其它系统。 用于控制天线的数字命令可以包括多个信息字段，例如方向字段，信道字段，增益字段和极性字段。 无法支持指定字段的天线无视不支持的字段中的信息。 每个支持的字段中的信息被解码并用于调整相应的天线特性。

公开(公告)号：US20130215984A1

公开(公告)日：2013-08-22

申请号：US13456850

申请日：2012-05-11

Applicant: Carl Scarpa ,  Edward Schell ,  Christopher Strolle

Inventor： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC: H04L27/04

CPC classification number: H04L27/04 ,  H04L27/01 ,  H04L27/2601 ,  H04L27/265 ,  H04L27/3461 ,  H04L27/3488 ,  H04L69/324

Abstract: 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：US08391132B2

公开(公告)日：2013-03-05

申请号：US12415648

申请日：2009-03-31

Applicant: Carl Scarpa ,  Christopher Strolle

Inventor： Carl Scarpa ,  Christopher Strolle

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

CPC classification number: H04L27/2627 ,  H04B7/0671 ,  H04B7/12 ,  H04L5/0017 ,  H04L27/2602

Abstract: 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.

Abstract translation: 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：US20100045528A1

公开(公告)日：2010-02-25

申请号：US12612483

申请日：2009-11-04

Applicant: John G. N. Henderson ,  Carl Scarpa

Inventor： John G. N. Henderson ,  Carl Scarpa

IPC: H01Q3/00

CPC classification number: H01Q1/007 ,  H01Q1/24 ,  H01Q3/2611 ,  H01Q7/005

Abstract: Antennas with steerable antenna patterns and techniques for using such antennas are described. In accordance with the invention, antenna patterns with one or more NULLs are used. Through the use of digital control signals the antenna pattern is steered so that a source of signal interference, e.g., a multipath signal, will be located in a NULL. In this manner the received signal's S/N ratio can be maximized thereby facilitating demodulation. The techniques of the invention can be applied to television, computer devices, mobile devices and a wide range of other systems. Digital commands to control an antenna may include multiple information fields, e.g., a direction field, a channel field, a gain field and a polarity field. Antennas incapable of supporting the specified fields disregard information in fields which are not supported. Information in each supported field is decoded and used to adjust the corresponding antenna characteristic.

Abstract translation: 描述了具有可导向天线方向图和使用这种天线的技术的天线。 根据本发明，使用具有一个或多个NULL的天线方向图。 通过使用数字控制信号，导航天线方向图，使得诸如多路径信号的信号干扰源将位于空值中。 以这种方式，可以使接收信号的S / N比最大化，从而便于解调。 本发明的技术可以应用于电视，计算机设备，移动设备以及各种其他系统。 用于控制天线的数字命令可以包括多个信息字段，例如方向字段，信道字段，增益字段和极性字段。 无法支持指定字段的天线无视不支持的字段中的信息。 每个支持的字段中的信息被解码并用于调整相应的天线特性。

公开(公告)号：US20090172492A1

公开(公告)日：2009-07-02

申请号：US12221363

申请日：2008-08-01

Applicant: Carl Scarpa ,  Edward Schell

Inventor： Carl Scarpa ,  Edward Schell

IPC: H03M13/27 ,  G06F11/10

CPC classification number: H03M13/1105 ,  H03M13/1102 ,  H03M13/2732 ,  H03M13/2746 ,  H03M13/2771 ,  H03M13/2792 ,  H04B7/1858 ,  H04L1/0057 ,  H04L1/0071

Abstract: Systems, methods and apparatus are described to interleave LDPC coded data for reception over a mobile communications channel, such as, for example, a satellite channel. In exemplary embodiments of the present invention, a method for channel interleaving includes segmenting a large LDPC code block into smaller codewords, randomly shuffling the code segments of each codeword and then convolutionally interleaving the randomly shuffled code words. In exemplary embodiments of the present invention, such random shuffling can guarantee that no two consecutive input code segments will be closer than a defined minimum number of code segments at the output of the shuffler. In exemplary embodiments of the present invention, by keeping data in, for example, manageable sub-sections, accurate SNR estimations, which are needed for the best possible LDPC decoding performance, can be facilitated based on, for example, iterative bit decisions.

Abstract translation: 描述了系统，方法和装置来交织用于通过诸如卫星信道的移动通信信道进行接收的LDPC编码数据。 在本发明的示例性实施例中，一种用于信道交织的方法包括将大型LDPC码块分割成较小的码字，随机混洗每个码字的码片段，然后对随机混洗码字进行卷积交织。 在本发明的示例性实施例中，这种随机混洗可以保证在洗牌器的输出处没有两个连续的输入代码段将比规定的最小数量的代码段更接近。 在本发明的示例性实施例中，通过将数据保存在例如可管理子部分中，可以基于例如迭代比特决定来促进针对最佳LDPC解码性能所需的精确SNR估计。

公开(公告)号：US20090097592A1

公开(公告)日：2009-04-16

申请号：US12079782

申请日：2008-03-28

Applicant: Carl Scarpa ,  Edward Schell

Inventor： Carl Scarpa ,  Edward Schell

IPC: H04L27/22

CPC classification number: H04L27/2271 ,  H04L27/183

Abstract: Systems and methods for removing phase shifts due to hierarchical modulation to improve synchronization and performance in legacy and hierarchical decoders are presented. In exemplary embodiments of the present invention, methods of compensating for the effects of hierarchical modulation can, for example, comprise receiving an I,Q symbol that has been further modulated by an overlay phase shift, detecting the direction of the overlay phase shift, de-rotating the symbol by a defined angle corresponding to the overlay phase shift and said direction; and passing the symbol to legacy synchronization and forward error correction decoding stages after said de-rotating. An exemplary receiver can be provided to implement the disclosed methods. Exemplary embodiments of the present invention provide the simplest solution to compensating for overlay modulation without requiring modification of any proven algorithms within legacy demodulator designs. The methods of exemplary embodiments of the present invention allow for essentially any offset angle used in an overlay modulation scheme to have minimal effect on signal acquisition and performance. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract translation: 提出了用于消除由分级调制引起的相移以改善传统和分层解码器中的同步和性能的系统和方法。 在本发明的示例性实施例中，补偿分级调制的影响的方法可以例如包括接收已经被覆盖相移进一步调制的I，Q符号，检测覆盖相移的方向，de 将符号旋转与覆盖相移和所述方向对应的限定角度; 并且在所述去旋转之后将符号传递到传统同步和前向纠错解码阶段。 可以提供示例性接收机来实现所公开的方法。 本发明的示例性实施例提供了用于补偿覆盖调制的最简单的解决方案，而不需要修改传统解调器设计中的任何已验证的算法。 本发明的示例性实施例的方法允许在覆盖调制方案中使用的基本上任何偏移角对信号采集和性能具有最小的影响。 要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。