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    CHANNEL MONITORING METHODS IN A WIRELESS BROADCAST SYSTEM
    21.
    发明申请
    CHANNEL MONITORING METHODS IN A WIRELESS BROADCAST SYSTEM 审中-公开
    无线广播系统中的信道监测方法

    公开(公告)号：US20080020751A1

    公开(公告)日：2008-01-24

    申请号：US11828336

    申请日：2007-07-25

    申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04Q7/20

    CPC分类号： H04W72/005

    摘要： Systems and methodologies are described that facilitate monitoring RF channels in a wireless communication environment to determine whether one or more channels comprise a forward-link-only (FLO) signal. A receiver can receive a first RF channel with a FLO signal and can monitor other RF channels for FLO signals. Upon a determination that a monitored RF channel comprises a FLO signal, the receiver can switch between the first RF channel and the monitored RF channel. FLO signal detection can be performed using one or more of a wide-area identification channel energy detection protocol and a wide-area overhead information symbol decoding error detection protocol.

    摘要翻译： 描述了便于在无线通信环境中监视RF信道以确定一个或多个信道是包括仅前向链路（FLO）信号的系统和方法。 接收机可以接收具有FLO信号的第一RF信道，并且可以监视FLO信号的其他RF信道。 在确定被监视的RF信道包括FLO信号之后，接收机可以在第一RF信道和所监视的RF信道之间切换。 可以使用广域识别信道能量检测协议和广域开销信息符号解码错误检测协议中的一个或多个来执行FLO信号检测。

    Efficient employment of digital upsampling using IFFT in OFDM systems for simpler analog filtering
    23.
    发明授权
    Efficient employment of digital upsampling using IFFT in OFDM systems for simpler analog filtering 有权
    在OFDM系统中有效利用使用IFFT的数字上采样进行更简单的模拟滤波

    公开(公告)号：US09042461B2

    公开(公告)日：2015-05-26

    申请号：US11373001

    申请日：2006-03-09

    申请人： Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Rajiv Vijayan

    发明人： Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Rajiv Vijayan

    IPC分类号： H04N7/18 ,  H04L27/26

    CPC分类号： H04L27/2644

    摘要： Systems and methods are provided for transmitting OFDM information via IFFT up-sampling components that transmit data at a higher sampling rate than conventional systems to simplify filter requirements and mitigate leakage between symbols. In one embodiment, an NL point IFFT is performed on a zero inserted set of frequency domain symbols. In another embodiment, the NL point IFFT is further optimized by exploiting the fact that (N−1) L of the frequency domain symbols are zero. This enables an embodiment that consists of a pre-processor that multiplies the input samples by complex phase factors, followed by L point IFFTs.

    摘要翻译： 提供了系统和方法，用于通过IFFT上采样组件传输OFDM信息，该组件以比常规系统更高的采样速率传输数据，以简化滤波器要求并减轻符号之间的泄漏。 在一个实施例中，对零插入的频域符号组执行NL点IFFT。 在另一个实施例中，通过利用频域符号的（N-1）L为零的事实进一步优化NL点IFFT。 这使得能够由预处理器组成的实施例，该预处理器将输入样本乘以复相位因子，随后是L点IFFT。

    Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal
    26.
    发明授权
    Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal 有权
    降低OFDM发射信号的峰均比的方法和装置

    公开(公告)号：US07991040B2

    公开(公告)日：2011-08-02

    申请号：US11519256

    申请日：2006-09-11

    申请人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04B1/00

    CPC分类号： H04L27/2614 ,  H04L27/2615

    摘要： Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.

    摘要翻译： 降低OFDM发射信号的峰均比的方法和装置。 在一方面，提供了一种降低发射波形的峰均比的方法。 该方法包括：获得主加扰器序列，产生具有基于要加扰的数据的长度特性的次扰频序列，以及组合所述主加扰序列和次加扰序列以产生PAR减少序列。 在另一方面，提供一种用于减小发射波形的峰均比的装置。 该装置包括辅助发生器，其被配置为产生具有基于要加扰的数据的长度特性的二次扰频器序列，以及被配置为组合主加扰器序列和次加扰器序列以产生PAR减少序列的组合逻辑。

    RF CHANNEL SWITCHING IN BROADCAST OFDM SYSTEMS
    28.
    发明申请
    RF CHANNEL SWITCHING IN BROADCAST OFDM SYSTEMS 有权
    广播OFDM系统中的RF信道切换

    公开(公告)号：US20100165851A1

    公开(公告)日：2010-07-01

    申请号：US12722308

    申请日：2010-03-11

    申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04W4/00 ,  H04B17/00 ,  H04L12/26

    CPC分类号： H04W48/16

    摘要： Systems and methodologies are described that facilitate monitoring RF channels in a wireless communication environment to determine whether one or more channels comprise a forward-link-only (FLO) signal. A receiver can receive a first RF channel with a FLO signal and can monitor other RF channels for FLO signals. Upon a determination that a monitored RF channel comprises a FLO signal, the receiver can switch between the first RF channel and the monitored RF channel to facilitate providing seamless reception of the FLO signal, which can be superframe synchronized between RF channels. FLO signal detection can be performed using one or more of a wide-area identification channel energy detection protocol and a wide-area overhead information symbol decoding error detection protocol.

    摘要翻译： 描述了便于在无线通信环境中监视RF信道以确定一个或多个信道是包括仅前向链路（FLO）信号的系统和方法。 接收机可以接收具有FLO信号的第一RF信道，并且可以监视FLO信号的其他RF信道。 在确定被监视的RF信道包括FLO信号之后，接收机可以在第一RF信道和所监视的RF信道之间切换，以便于提供FLO信号的无缝接收，FLO信号可以在RF信道之间超帧同步。 可以使用广域识别信道能量检测协议和广域开销信息符号解码错误检测协议中的一个或多个来执行FLO信号检测。

    Method to track analog gain step magnitudes online during operation of wireless mobile devices
    29.
    发明申请
    Method to track analog gain step magnitudes online during operation of wireless mobile devices 有权
    在无线移动设备操作期间在线跟踪模拟增益步幅的方法

    公开(公告)号：US20060215793A1

    公开(公告)日：2006-09-28

    申请号：US11373369

    申请日：2006-03-10

    申请人： Linbo Li ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Linbo Li ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04L27/08

    CPC分类号： H03G3/3052 ,  H03F1/0205 ,  H03F3/24 ,  H03F2200/294 ,  H03F2200/372 ,  H03G1/0088 ,  H03G3/3068 ,  H04B1/109

    摘要： Systems and methods are provided for tracking and compensating for analog gain mismatches or changes in a receiver. In an embodiment, a method is provided to track analog gain step magnitudes during operation of a device. The method includes employing an error signal between an automatic gain control (AGC) output and a reference level as input to a gain step magnitude tracking component. This also includes determining at least one compensation value from the AGC output to update a nominal gain step magnitude that tracks an actual gain step magnitude.

    摘要翻译： 提供系统和方法来跟踪和补偿接收机中的模拟增益失配或变化。 在一个实施例中，提供了一种用于在设备操作期间追踪模拟增益步幅的方法。 该方法包括采用自动增益控制（AGC）输出和参考电平之间的误差信号作为增益步长跟踪分量的输入。 这还包括从AGC输出确定至少一个补偿值以更新追踪实际增益步幅的标称增益步幅。