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公开(公告)号：US20210119847A1
公开(公告)日：2021-04-22
申请号：US16655822
申请日：2019-10-17
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：US20200052875A1
公开(公告)日：2020-02-13
申请号：US16521880
申请日：2019-07-25
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell
IPC: H04L7/033
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：US10110296B2
公开(公告)日：2018-10-23
申请号：US14845080
申请日：2015-09-03
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. Reclamation of bandwidth can be achieved in a way that is invisible to a legacy receiver, and that does not interfere with its reception of a legacy signal. 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. In other embodiments, one or more clusters or subdivisions with only new data may be transmitted, using the same or different 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.
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公开(公告)号：US12166617B2
公开(公告)日：2024-12-10
申请号：US18214657
申请日：2023-06-27
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：US12021677B2
公开(公告)日：2024-06-25
申请号：US17746436
申请日：2022-05-17
Applicant: Sirius XM Radio Inc.
Inventor： Edward Schell , Carl Scarpa
CPC classification number: H04L27/2646 , H04B7/18513 , H04L27/2605
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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Patent Agency Ranking
公开(公告)号：US20230253954A1
公开(公告)日：2023-08-10
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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公开(公告)号：US11444602B2
公开(公告)日：2022-09-13
申请号：US16907885
申请日：2020-06-22
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Robert Joseph Topper
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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公开(公告)号：US11336497B2
公开(公告)日：2022-05-17
申请号：US17075046
申请日：2020-10-20
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：US10063398B2
公开(公告)日：2018-08-28
申请号：US15271751
申请日：2016-09-21
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell , Christopher Hugh Strolle
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.
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20.发明申请EFFICIENT IMPLEMENTATION TO PERFORM ITERATIVE DECODING WITH LARGE ITERATION COUNTS 审中-公开高效实施大型迭代计算的迭代解码公开(公告)号：US20150188579A1
公开(公告)日：2015-07-02
申请号：US14547335
申请日：2014-11-19
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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