公开(公告)号：US20140025839A1

公开(公告)日：2014-01-23

申请号：US14021833

申请日：2013-09-09

Applicant: Sirius XM Radio, Inc

Inventor： Paul Marko ,  Joseph Smallcomb ,  Richard Michalski

IPC: H04L29/06

CPC classification number: H04L65/608 ,  H04H20/40 ,  H04H20/42

Abstract: Systems and methods for increasing bandwidth for digital content delivery are presented. A content delivery method and system split a digitally encoded content file (e.g., song, television show, movie, podcast, or other audio or video content file) to be delivered to receivers into at least two files with a first file being stored at a receiver in advance of receiving the second file. The first file generally includes a majority of the information in the content file but is denatured and cannot be decoded by a receiver or media player to produce even a portion of the original content file without the second file. The second file includes information derived from the original content file that is not contained in the first file. Upon receiving the transmitted second file, a receiver combines and processes both files to recover the original content file wholly or substantially for playback.

Abstract translation: 提出了增加数字内容传送带宽的系统和方法。 内容传送方法和系统将要传送给接收者的数字编码内容文件（例如，歌曲，电视节目，电影，播客或其他音频或视频内容文件）分割成至少两个文件，其中第一文件被存储在 接收器提前接收第二个文件。 第一文件通常包括内容文件中的大部分信息，但是变性，并且不能被接收器或媒体播放器解码以产生甚至一部分原始内容文件而没有第二文件。 第二个文件包括从原始内容文件导出的信息，该文件不包含在第一个文件中。 在接收到所发送的第二文件之后，接收器组合并处理这两个文件以完全或基本上用于回放的原始内容文件。

公开(公告)号：US20130121350A1

公开(公告)日：2013-05-16

申请号：US13646099

申请日：2012-10-05

Applicant: Sirius XM Radio, Inc.

Inventor： Carl Scarpa ,  Edward Schell ,  Christopher Strolle

IPC: H04L27/26

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。