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21.发明授权公开(公告)号：US08923429B2
公开(公告)日：2014-12-30
申请号：US13646099
申请日：2012-10-05
Applicant: Sirius XM Radio, Inc.
Inventor： Carl Scarpa , Edward Schell , Christopher Strolle
CPC classification number: H04L27/2627 , H04L5/0007 , H04L5/0028 , H04L27/0008 , H04L27/0012 , H04L27/183 , H04L27/2053 , H04L27/2071 , H04L27/3488 , H04L2025/03401 , H04L2025/03414
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：US20140213174A1
公开(公告)日：2014-07-31
申请号：US14103146
申请日：2013-12-11
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell
IPC: H04B7/185
CPC classification number: H04B7/18513
Abstract: Methods and apparatus are presented to allow one receiver architecture to be used for the reception of two different SDARS signals. Common receiver functions can be utilized to process each signal, thereby obviating the need to duplicate hardware elements. For example, it can be assumed that both signals will not be received at the same time, thus allowing for considerable hardware reuse and lowering the cost of an interoperable receiver.
Abstract translation: 提出了方法和装置，以允许一个接收器架构用于接收两个不同的SDARS信号。 可以使用公共接收机功能来处理每个信号，从而避免复制硬件元件的需要。 例如，可以假设两个信号不会同时被接收，从而允许相当大的硬件重用并降低可互操作的接收机的成本。
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23.发明申请METHOD AND APPARATUS FOR INTERLEAVING LOW DENSITY PARITY CHECK (LDPC) CODES OVER MOBILE SATELLITE CHANNELS 有权用于在移动卫星信道上交换低密度奇偶校验（LDPC）码的方法和装置公开(公告)号：US20140189463A1
公开(公告)日：2014-07-03
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.
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。
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公开(公告)号：US20230362046A1
公开(公告)日：2023-11-09
申请号：US18214657
申请日：2023-06-27
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：US10999116B1
公开(公告)日：2021-05-04
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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Patent Agency Ranking
公开(公告)号：US10903974B2
公开(公告)日：2021-01-26
申请号：US16521880
申请日：2019-07-25
Applicant: Sirius XM Radio Inc.
Inventor： Carl Scarpa , Edward Schell
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：US10812310B1
公开(公告)日：2020-10-20
申请号：US16655859
申请日：2019-10-17
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：US20190123807A1
公开(公告)日：2019-04-25
申请号：US16168285
申请日：2018-10-23
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：US20170230212A1
公开(公告)日：2017-08-10
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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30.发明申请NOISE POWER ESTIMATION IN DIGITAL COMMUNICATIONS SYSTEMS WITH FAST FADING CHANNELS 审中-公开数字通信系统噪声功率估计与快速衰减信道公开(公告)号：US20160028423A1
公开(公告)日：2016-01-28
申请号：US14774930
申请日：2014-03-18
Applicant: SIRIUS XM RADIO INC.
Inventor： Sharif Sazzad , Carl Scarpa , Edward Schell
CPC classification number: H04B1/10 , H04L1/20 , H04L1/206 , H04L25/062
Abstract: An accurate and fast method for estimation of noise power in digital communication systems is presented. Exemplary embodiments of the present invention do not rely upon the need for embedding reference sequences in the transmitted data. Accordingly, such exemplary embodiments are especially suited for tracking variations of noise power in digital communication systems with fast fading channels.
Abstract translation: 提出了一种准确，快速的数字通信系统中噪声功率估计方法。 本发明的示例性实施例不依赖于在所发送的数据中嵌入参考序列的需要。 因此，这样的示例性实施例特别适用于跟踪具有快速衰落信道的数字通信系统中噪声功率的变化。
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