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    • 2. 发明申请
    • DEMODULATOR WITH CONFIGURABLE ADAPTIVE EQUALIZER
    • 具有可配置自适应均衡器的DEMODULATOR
    • US20090110047A1
    • 2009-04-30
    • US11932320
    • 2007-10-31
    • Yhean-sen LaiZhenyu WangJinguo Yu
    • Yhean-sen LaiZhenyu WangJinguo Yu
    • H03H7/30
    • H03G3/3078H04L25/03057H04L27/183
    • An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, the receiver has an adaptive equalizer configurable to operate with QPSK or 8PSK modulated signals. In the equalizer, a slicer table memory responsive to an 8-level quantizer (slicer) and a select signal is configured to map the output of the quantizer into QPSK or 8PSK symbol coordinates depending on whether the QPSK or the 8PSK signal is being received. The slicer table memory may be loaded with the symbol coordinates calculated from data in the 8PSK signal. A pattern matcher determines if the 8PSK or the QPSK signal is being received and asserts the select signal to configure the slicer table memory accordingly.
    • 用于卫星广播应用的改进的多频道接收机等。 在示例性实施例中,接收机具有可配置为利用QPSK或8PSK调制信号进行操作的自适应均衡器。 在均衡器中,响应于8电平量化器(限幅器)和选择信号的限幅器表存储器被配置为根据是否接收到QPSK或8PSK信号将量化器的输出映射成QPSK或8PSK符号坐标。 切片机存储器可以装载从8PSK信号中的数据计算的符号坐标。 模式匹配器确定是否正在接收8PSK或QPSK信号,并且断言选择信号以相应地配置限幅器表存储器。
    • 5. 发明申请
    • MULTI-CHANNEL RECEIVER WITH IMPROVED AGC
    • 具有改进AGC的多通道接收器
    • US20110188489A1
    • 2011-08-04
    • US13085525
    • 2011-04-13
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • H04B1/06H04J1/00
    • H04L27/0008H03G3/3068H03G3/3078H04L27/2649
    • An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, a primary AGC loop controls an analog sub-receiver adapted to simultaneously receive multiple signals. Multiple digital demodulators, coupled to the sub-receiver, demodulate the multiple received signals. Multiple secondary AGC loops, one for each received signal, compensate for variations in demodulated signal strengths caused by the primary AGC loop. A feed-forward AGC compensation technique generates scalar control values for scaling the demodulated signals before the demodulated signals are processed by the secondary AGC loops. This at least partially compensates for gain variations caused by the primary AGC, reducing received signal drop-outs before the secondary AGC loops can compensate for the gain variations. Because of systemic delays in the sub-receiver and the demodulators, the scalar control values are independently timed to be coincident with the variations in the demodulated signal strengths caused by the primary AGC loop.
    • 用于卫星广播应用的改进的多频道接收机等。 在示例性实施例中,主AGC环路控制适于同时接收多个信号的模拟子接收机。 耦合到子接收机的多个数字解调器解调多个接收信号。 多个次级AGC环路,每个接收信号一个补偿由主AGC环路引起的解调信号强度的变化。 前馈AGC补偿技术产生标量控制值,用于在解调后的信号由次级AGC环路处理之前缩放解调信号。 这至少部分地补偿由主AGC引起的增益变化,在次级AGC环路可以补偿增益变化之前减少接收信号丢失。 由于子接收机和解调器中的系统延迟,标量控制值被独立地定时以与由主AGC环路引起的解调信号强度的变化一致。
    • 6. 发明授权
    • Multi-channel receiver with improved AGC
    • 具有改进AGC的多通道接收器
    • US07978773B2
    • 2011-07-12
    • US11648702
    • 2006-12-29
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • H04K27/00
    • H04L27/0008H03G3/3068H03G3/3078H04L27/2649
    • An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, a primary AGC loop controls an analog sub-receiver adapted to simultaneously receive multiple signals. Multiple digital demodulators, coupled to the sub-receiver, demodulate the multiple received signals. Multiple secondary AGC loops, one for each received signal, compensate for variations in demodulated signal strengths caused by the primary AGC loop. A feed-forward AGC compensation technique generates scalar control values for scaling the demodulated signals before the demodulated signals are processed by the secondary AGC loops. This at least partially compensates for gain variations caused by the primary AGC, reducing received signal drop-outs before the secondary AGC loops can compensate for the gain variations. Because of systemic delays in the sub-receiver and the demodulators, the scalar control values are independently timed to be coincident with the variations in the demodulated signal strengths caused by the primary AGC loop.
    • 用于卫星广播应用的改进的多频道接收机等。 在示例性实施例中,主AGC环路控制适于同时接收多个信号的模拟子接收机。 耦合到子接收机的多个数字解调器解调多个接收信号。 多个次级AGC环路,每个接收信号一个补偿由主AGC环路引起的解调信号强度的变化。 前馈AGC补偿技术产生标量控制值,用于在解调后的信号由次级AGC环路处理之前缩放解调信号。 这至少部分地补偿由主AGC引起的增益变化,在次级AGC环路可以补偿增益变化之前减少接收信号丢失。 由于子接收机和解调器中的系统延迟,标量控制值被独立地定时以与由主AGC环路引起的解调信号强度的变化一致。
    • 7. 发明申请
    • Multi-channel receiver with improved AGC
    • 具有改进AGC的多通道接收器
    • US20080268798A1
    • 2008-10-30
    • US11789550
    • 2007-04-25
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • H04Q7/20
    • H03G3/3078
    • An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, an AGC loop, under the control of an AGC processor, controls the gain of an analog sub-receiver adapted to simultaneously receive multiple signals to achieve a desired AGC setpoint signal intensity from the sub-receiver. Multiple digital demodulators, coupled to the sub-receiver by an analog-to-digital converter (ADC), demodulate the multiple received signals. The AGC controller, based upon which of the received signals are being demodulated, selects the desired AGC setpoint from a table of setpoints. The AGC controller may also provide selective power control to circuitry in the receiver and select the resolution of the ADC. The controller updates the AGC loop with step values selected from a group of values by an AGC control algorithm. Different groups of step values may be used by the controller depending on whether the signals are fading or not.
    • 用于卫星广播应用的改进的多频道接收机等。 在示例性实施例中,在AGC处理器的控制下的AGC环路控制适于同时接收多个信号以从子接收机实现期望的AGC设定点信号强度的模拟子接收机的增益。 通过模数转换器(ADC)耦合到子接收器的多个数字解调器解调多个接收信号。 AGC控制器基于哪个接收信号被解调,从设定点表中选择所需的AGC设定点。 AGC控制器还可以向接收机中的电路提供选择性功率控制,并选择ADC的分辨率。 控制器通过AGC控制算法从具有一组值的步长值更新AGC环路。 根据信号是否衰减,控制器可以使用不同的步进值组。
    • 8. 发明授权
    • Multi-channel receiver with improved AGC
    • 具有改进AGC的多通道接收器
    • US08391384B2
    • 2013-03-05
    • US13085525
    • 2011-04-13
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • Yhean-Sen LaiJie SongZhenyu WangJinguo Yu
    • H04K27/00
    • H04L27/0008H03G3/3068H03G3/3078H04L27/2649
    • An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, a primary AGC loop controls an analog sub-receiver adapted to simultaneously receive multiple signals. Multiple digital demodulators, coupled to the sub-receiver, demodulate the multiple received signals. Multiple secondary AGC loops, one for each received signal, compensate for variations in demodulated signal strengths caused by the primary AGC loop. A feed-forward AGC compensation technique generates scalar control values for scaling the demodulated signals before the demodulated signals are processed by the secondary AGC loops. This at least partially compensates for gain variations caused by the primary AGC, reducing received signal drop-outs before the secondary AGC loops can compensate for the gain variations. Because of systemic delays in the sub-receiver and the demodulators, the scalar control values are independently timed to be coincident with the variations in the demodulated signal strengths caused by the primary AGC loop.
    • 用于卫星广播应用的改进的多频道接收机等。 在示例性实施例中,主AGC环路控制适于同时接收多个信号的模拟子接收机。 耦合到子接收机的多个数字解调器解调多个接收信号。 多个次级AGC环路,每个接收信号一个补偿由主AGC环路引起的解调信号强度的变化。 前馈AGC补偿技术产生标量控制值,用于在解调后的信号由次级AGC环路处理之前缩放解调信号。 这至少部分地补偿由主AGC引起的增益变化,在次级AGC环路可以补偿增益变化之前减少接收信号丢失。 由于子接收机和解调器中的系统延迟,标量控制值被独立地定时以与由主AGC环路引起的解调信号强度的变化一致。