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    • 4. 发明申请
    • Method to enable single frequency network optimization
    • 启用单频网络优化的方法
    • US20060274855A1
    • 2006-12-07
    • US11143044
    • 2005-06-02
    • Eric DiBiasoMichael HiattGlenn Walker
    • Eric DiBiasoMichael HiattGlenn Walker
    • H04L27/20
    • H04L27/183H04H20/30H04H20/67H04L27/2604
    • Additional data may be added to the current SDARS satellite signals as a phase and/or amplitude offset from the legacy quadrature phase shift keying (QPSK) modulated data and transmitted by the SDAR terrestrial repeaters. However, in the case where a legacy receiver architecture for a differential modulation system outputs angular/phase differences between carriers, the phase and/or amplitude information appears as distortion to the legacy receiver. The present invention provides a method for optimizing the SDARS infrastructure more efficiently by allowing independent adjustment of the phase and/or amplitude offset (610) at each terrestrial site. The present invention provides a method for adjusting the performance of each signal together or separately as needed.
    • 附加数据可以作为与传统正交相移键控(QPSK)调制数据的相位和/或幅度偏移并由SDAR地面转发器发送的当前SDARS卫星信号相加。 然而,在用于差分调制系统的传统接收器架构输出载波之间的角度/相位差的情况下,相位和/或幅度信息表现为传统接收机的失真。 本发明提供了一种通过允许对每个地面站点处的相位和/或幅度偏移(610)进行独立调整来更有效地优化SDARS基础设施的方法。 本发明提供一种根据需要一起或分开地调整每个信号的性能的方法。
    • 8. 发明申请
    • Technique for providing secondary data in a single-frequency network
    • 在单频网络中提供辅助数据的技术
    • US20070053450A1
    • 2007-03-08
    • US11153696
    • 2005-06-15
    • Glenn WalkerJoseph Dockemeyer
    • Glenn WalkerJoseph Dockemeyer
    • H04K1/10
    • H04H20/10H04H20/67H04H20/95H04H40/90
    • A technique for providing secondary data in a single frequency network (SFN) provides a first forward error correcting (FEC) decoder for decoding a received coded orthogonal frequency division multiplex (COFDM) signal. A second FEC decoder is also provided for decoding a received COFDM signal. When the received COFDM signal includes valid primary data, the first FEC decoder is utilized to decode the received COFDM signal to provide general information, i.e., music, sports, etc. When a received COFDM signal includes valid secondary data, the second FEC decoder is utilized to decode the received COFDM signal to provide regional information, e.g., emergency broadcasting information. The received COFDM signal includes one or more defined COFDM symbols inserted by a transmitter of the COFDM signal to indicate the valid secondary data and the invalid primary data.
    • 用于在单频网络(SFN)中提供二次数据的技术提供了用于对接收的编码正交频分复用(COFDM)信号进行解码的第一前向纠错(FEC)解码器。 还提供了第二FEC解码器用于对所接收的COFDM信号进行解码。 当所接收的COFDM信号包括有效的主数据时,第一FEC解码器用于解码所接收的COFDM信号以提供一般信息,即音乐,运动等。当所接收的COFDM信号包括有效次要数据时,第二FEC解码器是 用于解码所接收的COFDM信号以提供区域信息,例如紧急广播信息。 所接收的COFDM信号包括由COFDM信号的发射机插入的一个或多个限定的COFDM符号,以指示有效的辅助数据和无效的主数据。
    • 9. 发明申请
    • Method to minimize compatibility error in hierarchical modulation using variable phase
    • 使用可变相分级调制最小化兼容性错误的方法
    • US20060276145A1
    • 2006-12-07
    • US11474747
    • 2006-06-26
    • Glenn WalkerEric DiBiasoMichael Hiatt
    • Glenn WalkerEric DiBiasoMichael Hiatt
    • H04B1/02H04B1/66
    • H04B7/18513H04L27/183H04L27/3488
    • The present invention provides a method of hierarchically modulating first and second digital data streams in a broadcast system such as an SDAR system that is compatible with legacy receivers. The second digital data stream, but not the first, is provided with a non-binary pseudo-random encoding. A carrier is first modulated, e.g. QPSK, by the first digital data stream; and a second modulation is performed with the encoded second digital data stream. The encoding includes a multiplication of a matrix formed of 2, 3 or 4 consecutive bits of the secondary data stream by a matrix, e.g. a Hadamard matrix to form a product matrix having non-binary values that are used to modify consecutive symbols of the first modulation. The second modulation appears as Gaussian noise to legacy receivers over time.
    • 本发明提供了一种在诸如与传统接收机兼容的SDAR系统的广播系统中分级调制第一和第二数字数据流的方法。 第二数字数据流,但不是第一数字数据流被提供有非二进制伪随机编码。 首先调制载体,例如 QPSK,由第一数字数据流; 并且利用编码的第二数字数据流执行第二调制。 编码包括由辅助数据流的2,3或4个连续比特由矩阵形成的矩阵的乘法,例如, 形成具有用于修改第一调制的连续符号的非二进制值的乘积矩阵的哈达玛矩阵。 第二调制随着时间的推移呈现为传统接收机的高斯噪声。
    • 10. 发明申请
    • Method and apparatus for processing air-borne digital data received in a motor vehicle
    • 用于处理在机动车辆中接收的空中数字数据的方法和装置
    • US20050277382A1
    • 2005-12-15
    • US10867297
    • 2004-06-14
    • Glenn Walker
    • Glenn Walker
    • H04H20/40H04H20/51H04H1/00
    • H04H20/22H04H20/02H04H20/40H04H20/51
    • A method of communicating data in a satellite digital audio radio (SDAR) system includes transmitting two radio frequency digital signals from respective satellites to each of a plurality of SDAR receivers disposed within respective motor vehicles. The two signals include substantially identical information. Each of the signals includes universal data relevant to each of the SDAR receivers, and group-specific data relevant to less than all of the SDAR receivers. At least one segment of the group-specific data that is relevant to only a corresponding group of the SDAR receivers is in at least one predetermined time location within one of the two signals. At least one of the SDAR receivers in the corresponding group receives the two radio frequency digital signals and is provided with information identifying the at least one predetermined time location. The at least one segment of the group-specific data is selected from the at least one predetermined time location within the one of the two signals and is stored in a memory device. At least one segment of the universal data from the one of the two signals is stored in the memory device. The stored at least one segment of the group-specific data from the one of the two signals is combined with group-specific data from an other of the two signals to thereby create a group-specific output signal. The stored at least one segment of the universal data is combined with universal data from the other of the two signals to thereby create a universal output signal.
    • 在卫星数字音频无线电(SDAR)系统中传送数据的方法包括将来自相应卫星的两个射频数字信号发射到设置在各自机动车辆内的多个SDAR接收机中的每一个。 两个信号包括基本相同的信息。 每个信号包括与每个SDAR接收机相关的通用数据,以及与小于所有SDAR接收机相关的组专用数据。 仅与SDAR接收机的相应组相关联的组特定数据的至少一个段在两个信号之一内的至少一个预定时间位置中。 相应组中的至少一个SDAR接收机接收两个射频数字信号,并且提供有识别至少一个预定时间位置的信息。 组特定数据的至少一个段从两个信号之一内的至少一个预定时间位置中选择,并存储在存储器装置中。 来自两个信号之一的通用数据的至少一个段被存储在存储器件中。 将来自两个信号之一的组特定数据的所存储的至少一个段与来自两个信号中的另一个的组专用数据组合,从而创建组特定输出信号。 所存储的通用数据的至少一个段与来自两个信号中的另一个的通用数据组合,从而创建通用输出信号。