Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems
    1.
    发明授权
    Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems 有权
    用于在数字广播和交互系统中提供载波同步的方法和装置

    公开(公告)号:US08275081B2

    公开(公告)日:2012-09-25

    申请号:US12893843

    申请日:2010-09-29

    Abstract: An approach is provided for supporting carrier synchronization in a digital broadcast and interactive system. A carrier synchronization module receives one or more signals representing a frame that includes one or more overhead fields (e.g., preamble and optional pilot blocks and one or multiple segments separated by pilot blocks). The module estimates carrier frequency and phase on a segment by segment basis and tracks frequency between segments. Carrier phase of the signal is estimated based upon the overhead field. Estimates carrier phase of random data field are determined based upon the estimated phase values from the overhead fields, and upon both the past and future data signals. Further, the frequency of the signal is estimated based upon the overhead fields and/or the random data field. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.

    Abstract translation: 提供了一种用于在数字广播和交互系统中支持载波同步的方法。 载波同步模块接收表示包括一个或多个开销字段(例如,前导码和可选导频块以及由导频块分隔的一个或多个片段)的帧的一个或多个信号。 该模块逐段估计载波频率和相位,并跟踪段之间的频率。 信号的载波相位基于开销字段来估计。 基于来自架空领域的估计相位值以及过去和未来数据信号来估计随机数据字段的载波相位。 此外,基于开销字段和/或随机数据字段来估计信号的频率。 上述布置特别适用于数字卫星广播和交互式系统。

    Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems
    3.
    发明授权
    Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems 有权
    用于在数字广播和交互系统中提供载波同步的方法和装置

    公开(公告)号:US07369633B2

    公开(公告)日:2008-05-06

    申请号:US10842325

    申请日:2004-05-10

    Abstract: An approach is provided for supporting carrier synchronization in a digital broadcast and interactive system. A carrier synchronization module receives one or more signals representing a frame that includes one or more overhead fields (e.g., preamble and optional pilot blocks and one or multiple segments separated by pilot blocks). The module estimates carrier frequency and phase on a segment by segment basis and tracks frequency between segments. Carrier phase of the signal is estimated based upon the overhead field. Estimates carrier phase of random data field are determined based upon the estimated phase values from the overhead fields, and upon both the past and future data signals. Further, the frequency of the signal is estimated based upon the overhead fields and/or the random data field. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.

    Abstract translation: 提供了一种用于在数字广播和交互系统中支持载波同步的方法。 载波同步模块接收表示包括一个或多个开销字段(例如,前导码和可选导频块以及由导频块分隔的一个或多个片段)的帧的一个或多个信号。 该模块逐段估计载波频率和相位,并跟踪段之间的频率。 信号的载波相位基于开销字段来估计。 基于来自架空领域的估计相位值以及过去和未来数据信号来估计随机数据字段的载波相位。 此外,基于开销字段和/或随机数据字段来估计信号的频率。 上述布置特别适用于数字卫星广播和交互式系统。

    Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying(QPSK) or offset quaternary phase shift keying (OQPSK)
    5.
    发明申请
    Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying(QPSK) or offset quaternary phase shift keying (OQPSK) 有权
    用于提供与四相相移键控(QPSK)或偏移四相相移键控(OQPSK)向后兼容的更高阶调制的方法和装置,

    公开(公告)号:US20070263751A1

    公开(公告)日:2007-11-15

    申请号:US11879607

    申请日:2007-07-18

    CPC classification number: H04L27/3488 H04L27/183

    Abstract: A method and apparatus for providing an asymmetrical backwards compatible communications signal that is capable of being decoded by QPSK and OQPSK receivers as well as PSK and QAM receivers is provided. The invention comprises a timing error accumulator coupled to a first bit stream. The first bit stream includes content that is common to the QPSK/OQPSK receiver and to the PSK/QAM receiver. A phase error accumulator is coupled to a second bit stream and adjusts the phase of symbols in the second bit stream. A phase and timing error compensator is coupled to the phase error accumulator and the timing error accumulator and adjusts the first and second bit streams received from the phase error accumulator and the timing error accumulator in order to reduce timing and phase errors. A higher order modulator coupled to the phase- and timing error compensator is also provided. The higher order modulator processes the first and second bit streams to provide the asymmetrical backwards compatible signal.

    Abstract translation: 提供一种提供能够被QPSK和OQPSK接收机以及PSK和QAM接收机解码的不对称向后兼容通信信号的方法和装置。 本发明包括耦合到第一位流的定时误差累加器。 第一比特流包括对于QPSK / OQPSK接收机和PSK / QAM接收机是共同的内容。 相位误差累加器被耦合到第二比特流并且调整第二比特流中的符号的相位。 相位和定时误差补偿器耦合到相位误差累加器和定时误差累加器,并调整从相位误差累加器和定时误差累加器接收的第一和第二比特流,以减少定时和相位误差。 还提供耦合到相位和定时误差补偿器的高阶调制器。 高阶调制器处理第一和第二比特流以提供不对称的向后兼容信号。

    Method and apparatus of estimating non-linear amplifier response in an overlaid communication system
    7.
    发明申请
    Method and apparatus of estimating non-linear amplifier response in an overlaid communication system 审中-公开
    在覆盖的通信系统中估计非线性放大器响应的方法和装置

    公开(公告)号:US20050032472A1

    公开(公告)日:2005-02-10

    申请号:US10637225

    申请日:2003-08-08

    CPC classification number: H04B7/18515 H04B1/0475

    Abstract: An approach is provided estimating non-linear characteristics of an amplifier (such as a Travelling Wave Tube Amplifier) used to amplify a composite signal in a radio communication system. The composite signal, which includes a plurality of inbound signals overlay on an outbound signal, is sampled. The outbound signal is utilized as a training signal. Coarse estimates of the response of the amplifier is generated based on the samples of the composite signal and the training signal. Further, the interference associated with the inbound signals are removed from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal. An estimated response of the amplifier is thus output, and can be utilized to provide accurate non-linearity compensation and cancellation.

    Abstract translation: 提供了一种用于估计用于在无线电通信系统中放大复合信号的放大器(例如行波管放大器)的非线性特性的方法。 对包括在出站信号上叠加的多个入站信号的复合信号进行采样。 出站信号用作训练信号。 基于复合信号和训练信号的样本,产生放大器响应的粗估计。 此外,通过曲线拟合和估计复合信号的干扰特性,从入射信号相关的干扰从放大器的响应的估计中去除。 因此输出放大器的估计响应,并且可以用于提供准确的非线性补偿和消除。

    Robust carrier identifying method and apparatus for bandwidth-on-demand (BOD) system
    8.
    发明授权
    Robust carrier identifying method and apparatus for bandwidth-on-demand (BOD) system 有权
    用于带宽需求(BOD)系统的坚固的载波识别方法和装置

    公开(公告)号:US06711710B2

    公开(公告)日:2004-03-23

    申请号:US09735675

    申请日:2000-12-13

    CPC classification number: H04B7/1858

    Abstract: An approach for identifying a particular carrier among a plurality of carriers in a satellite communication system is disclosed. A transmitter multiplies an encoded signal by a prescribed periodic sequence to form a watermarked signal and transmits the watermarked signal associated with a particular carrier over a communication channel. A receiver tunes to one of the carriers and extracts a data sequence from the one carrier. The receiver multiplies the data sequence with the prescribed periodic sequence to form another watermarked signal and determines whether the watermarked signals match.

    Abstract translation: 公开了一种在卫星通信系统中的多个载波中识别特定载波的方法。 发射机将经编码的信号乘以规定的周期序列以形成水印信号,并通过通信信道发送与特定载波相关联的水印信号。 接收机调谐到一个载波并从一个载波提取数据序列。 接收器将数据序列与规定的周期序列相乘以形成另一个水印信号,并确定水印信号是否匹配。

    Current-fed dc/dc converter with multilevel transformer and method of operation thereof
    9.
    发明授权
    Current-fed dc/dc converter with multilevel transformer and method of operation thereof 失效
    具有多电平变压器的电流馈电dc / dc转换器及其操作方法

    公开(公告)号:US06317336B1

    公开(公告)日:2001-11-13

    申请号:US09540957

    申请日:2000-03-31

    CPC classification number: H02M3/33576 H02M3/33569 H02M3/3372

    Abstract: A regulation circuit for a current-fed power converter having a power switch adapted to transfer power to a transformer. In one embodiment, the regulation circuit includes a switching network coupled to a tapped winding of the transformer and operable to vary a turns ratio of the transformer thereby regulating an output voltage of the power converter.

    Abstract translation: 一种用于电流馈电功率转换器的调节电路,具有适于将功率传递到变压器的电源开关。 在一个实施例中,调节电路包括耦合到变压器的抽头绕组的开关网络,并且可操作以改变变压器的匝数比,从而调节功率转换器的输出电压。

    Multiple output flyback converter having improved cross-regulation and
method of operation thereof
    10.
    发明授权
    Multiple output flyback converter having improved cross-regulation and method of operation thereof 失效
    具有改进的交叉调节的多输出反激转换器及其操作方法

    公开(公告)号:US6078509A

    公开(公告)日:2000-06-20

    申请号:US193081

    申请日:1998-11-16

    CPC classification number: H02M3/33561

    Abstract: For use with a flyback converter having a modulator for providing a main switch control signal thereto and main and cross-regulated output circuits, the cross-regulated output circuit subject to ringing and resulting voltage excursion, a voltage excursion controller and a method of operating the same. In one embodiment, the controller includes: (1) a delay circuit, coupled to the modulator, that generates a delay signal based on the main switch control signal and (2) an auxiliary switch, associated with the cross-regulated output circuit, that receives the delay signal and opens to isolate at least a portion of the ringing within said cross-regulated output circuit.

    Abstract translation: 为了与具有用于提供主开关控制信号的调制器和主交叉输出电路的反激式转换器一起使用,交叉调节输出电路经受振铃和由此产生的电压偏移,电压偏移控制器和操作方法 相同。 在一个实施例中,控制器包括:(1)耦合到调制器的延迟电路,其产生基于主开关控制信号的延迟信号和(2)与交叉调节输出电路相关联的辅助开关, 接收延迟信号并打开以隔离所述交叉调节输出电路内的振铃的至少一部分。

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