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31.发明授权公开(公告)号：US09037939B2
公开(公告)日：2015-05-19
申请号：US14149379
申请日：2014-01-07
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell
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.
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公开(公告)号：US20150058704A1
公开(公告)日：2015-02-26
申请号：US14467884
申请日：2014-08-25
Applicant: Sirius XM Radio Inc.
Inventor： Ed Schell , Carl Scarpa
IPC: H03M13/27
CPC classification number: H03M13/2732 , H03M13/2789
Abstract: A parameterized interleaver structure is presented. The interleaver is designed to specify and maintain a maximum delay, irrespective of code rate and number of code blocks. The disclosed interleaver in effect concatenates two interleaver structures together. When the arm index is greater than a defined number N1, the arm delay is calculated using a set of parameters M2, D2, and N, where M2 is a maximum delay for an interleaver arm, D2 is the delay decrement, and N is the arm index, running from 1 to N, where N is the total number of arms in the interleaver. However, when the arm index N is less than or equal to N1, the delay can be calculated in a similar manner, but using a second set of parameters, namely M1, D1, and N instead, which involves a different delay length. This approach has the dual benefit of specifying both the maximum delay of the interleaver and the minimum required delay to process data.
Abstract translation: 提出了参数化交织器结构。 交织器被设计为指定和维持最大延迟，而不考虑码率和码块数。 所公开的交织器实际上将两个交织器结构连接在一起。 当臂指数大于定义数量N1时，使用一组参数M2，D2和N计算臂延迟，其中M2是交织器臂的最大延迟，D2是延迟减量，N是 臂指数，从1到N，其中N是交织器中的总臂数。 然而，当臂索引N小于或等于N1时，可以以类似的方式计算延迟，而是使用第二组参数，即M1，D1和N，这涉及不同的延迟长度。 该方法具有指定交织器的最大延迟和处理数据所需的最小延迟的双重优点。
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33.发明授权Efficient implementation to perform iterative decoding with large iteration counts 有权高效实现以大的迭代计数执行迭代解码公开(公告)号：US08910015B2
公开(公告)日：2014-12-09
申请号：US13690775
申请日：2012-11-30
Applicant: Sirius XM Radio, Inc.
Inventor： Carl Scarpa , Edward Schell
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。
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公开(公告)号：US20250168050A1
公开(公告)日：2025-05-22
申请号：US18752380
申请日：2024-06-24
Applicant: Sirius XM Radio Inc.
Inventor： Edward Schell , Carl Scarpa
Abstract: Systems and methods for a non-data-aided (NDA) approach to advanced OFDM timing are provided. This approach allows for accurate OFDM symbol timing and synchronization by avoiding inter-symbol interference (ISI) in multipath environments where an earliest arriving signal may not be the strongest signal. The NDA approach may rely on generating and applying a bias correction to a combined correlation result of the multi-path signals.
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公开(公告)号：US11973492B2
公开(公告)日：2024-04-30
申请号：US17943785
申请日：2022-09-13
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Robert Joseph Topper
CPC classification number: H03J7/047 , H03J1/0008
Abstract: Systems and methods for performing automatic frequency control are provided. Instead of relying on individual frequency tuners for each channel of a multi-channel receiver system, the present subject matter uses a single frequency tuner for receiving each channel of the multi-channel receiver system. A locked demodulator may be designated as a reference demodulator and frequency offset values associated with the reference demodulator may be applied to other demodulators of the multi-channel receiver. These frequency offset values may be used by individual demodulators of each channel for correcting corresponding frequency offsets.
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Patent Agency Ranking
公开(公告)号：US20230283450A1
公开(公告)日：2023-09-07
申请号：US17959621
申请日：2022-10-04
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell
IPC: H04L7/033
CPC classification number: H04L7/0331
Abstract: Systems and methods for maintaining synchronization of repeater networks with Global Positioning System (GPS) signals using phase locked loops (PLLs) and based on generation of predicted control words for controlling local oscillator frequencies is described. The predicted control words can be generated based on performing a linear fit of control words generated over a predetermined duration of time. Phase locked loops with additional false GPS pulse identification and GPS signal loss compensation circuitry can enforce a false pulse count threshold and/or an error threshold. The additional circuitry and prediction of control words can overcome errors in GPS receiver outputs and maintain accuracy of signal timings across single frequency networks using inexpensive local oscillators.
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公开(公告)号：US11689408B2
公开(公告)日：2023-06-27
申请号：US17217362
申请日：2021-03-30
Applicant: Sirius XM Radio Inc.
Inventor： Edward Schell , Carl Scarpa
CPC classification number: H04L27/2646 , H04L25/0204 , H04L25/061 , H04L27/265 , H04L27/2695
Abstract: Systems and methods for enabling pre-compensation of timing offsets in OFDM receivers without invalidating channel estimates are described. Timing offset estimations may be sent along with the received OFDM symbols for FFT computation and generating a de-rotated signal output. The timing offset estimation may provide a reference point for dynamic tracking of timing for an OFDM signal and estimated based on an integral value associated with the OFDM signal.
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公开(公告)号：US20220231754A1
公开(公告)日：2022-07-21
申请号：US17463268
申请日：2021-08-31
Applicant: Sirius XM Radio, Inc.
Inventor： Edward Schell , Carl Scarpa , John Goslin
Abstract: Systems, algorithms and methods for reclaiming unused portions of a satellite broadcast service's bandwidth for new services, utilizing higher performance coding techniques to yield better throughput, are presented. These systems, algorithms and methods achieve the reclaimed bandwidth in a way that is invisible to a legacy receiver, and that does not interfere with its reception of a legacy signal. In one embodiment, new data may be transmitted within a legacy transmission frame, for example within its cluster structure, using the same modulation and synchronization as used for the legacy data. The new data may be inserted into a channel or other subdivision at a head end. In another embodiment, one or more clusters or subdivisions with only new data may be transmitted, using the same modulation and synchronization as the legacy data clusters, but now employing a higher performing FEC and data interleaving structure on those clusters which contain only new data to yield an increase in available throughput. Finally, in a third embodiment, one or more clusters containing only new data may be transmitted, and in said one or more all new data clusters, different modulation and synchronization may be used then that of the legacy data clusters, thus employing a higher performing FEC and data interleaving structure than that of the legacy clusters. Various combinations of these approaches are also presented, as well as a set of novel receivers, or receiver configurations, to implement them and their combinations
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公开(公告)号：US20220078064A1
公开(公告)日：2022-03-10
申请号：US17217362
申请日：2021-03-30
Applicant: Sirius XM Radio Inc.
Inventor： Edward Schell , Carl Scarpa
Abstract: Systems and methods for enabling pre-compensation of timing offsets in OFDM receivers without invalidating channel estimates are described. Timing offset estimations may be sent along with the received OFDM symbols for FFT computation and generating a de-rotated signal output. The timing offset estimation may provide a reference point for dynamic tracking of timing for an OFDM signal and estimated based on an integral value associated with the OFDM signal.
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公开(公告)号：US20160065299A1
公开(公告)日：2016-03-03
申请号：US14845080
申请日：2015-09-03
Applicant: Sirius XM Radio Inc.
Inventor： Edward Schell , Carl Scarpa , John Goslin
CPC classification number: H04B7/185 , H04L1/004 , H04L27/3488
Abstract: Systems, algorithms and methods for reclaiming unused portions of a satellite broadcast service's bandwidth for new services, utilizing higher performance coding techniques to yield better throughput, are presented. These systems, algorithms and methods achieve the reclaimed bandwidth in a way that is invisible to a legacy receiver, and that does not interfere with its reception of a legacy signal. In one embodiment, new data may be transmitted within a legacy transmission frame, for example within its cluster structure, using the same modulation and synchronization as used for the legacy data. The new data may be inserted into a channel or other subdivision at a head end. In another embodiment, one or more clusters or subdivisions with only new data may be transmitted, using the same modulation and synchronization as the legacy data clusters, but now employing a higher performing FEC and data interleaving structure on those clusters which contain only new data to yield an increase in available throughput. Finally, in a third embodiment, one or more clusters containing only new data may be transmitted, and in said one or more all new data clusters, different modulation and synchronization may be used then that of the legacy data clusters, thus employing a higher performing FEC and data interleaving structure than that of the legacy clusters. Various combinations of these approaches are also presented, as well as a set of novel receivers, or receiver configurations, to implement them and their combinations
Abstract translation: 提出了利用更高性能的编码技术来产生更好的吞吐量的系统，算法和方法，用于回收卫星广播服务的新服务带宽的未使用部分。 这些系统，算法和方法以旧式接收机不可见的方式实现回收带宽，并且不干扰其对遗留信号的接收。 在一个实施例中，可以使用与用于遗留数据的相同的调制和同步，在传统传输帧内例如在其簇结构内传输新数据。 新的数据可以被插入到一个通道或者其他分部的头端。 在另一个实施例中，可以使用与传统数据集群相同的调制和同步来发送仅具有新数据的一个或多个集群或子部分，但是现在在仅包含新数据的那些集群上采用更高性能的FEC和数据交织结构 产生可用吞吐量的增加。 最后，在第三实施例中，可以发送仅包含新数据的一个或多个簇，并且在所述一个或多个全新数据簇中，可以使用不同的调制和同步，然后使用不同的调制和同步，因此采用较高性能 FEC和数据交织结构比传统集群的结构要好。 还提出了这些方法的各种组合，以及一组新颖的接收机或接收机配置，以实现它们及其组合
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