CDMA power control channel estimation using dynamic coefficient scaling
    1.
    发明授权
    CDMA power control channel estimation using dynamic coefficient scaling 失效
    CDMA功率控制信道估计使用动态系数缩放

    公开(公告)号:US5799011A

    公开(公告)日:1998-08-25

    申请号:US808331

    申请日:1997-02-28

    摘要: By time-sharing demodulator hardware between a primary data path (165), a power control data path (161), and a received signal strength indicator (RSSI) path (163), an entire power control data path (161) can be implemented in a demodulator (140) of a spread spectrum subscriber unit receiver with a low increase in gate count. The primary data path (165) and the power control data path (161) time-share a complex conjugate generator (270), a complex multiplier (280), and a real component extractor (290). Due to timing requirements, though, the channel estimation filter (240) of the primary data path cannot be time-shared with the power control data path. Instead, dynamic coefficient scaling is added to an infinite-duration impulse response (IIR) filter in the RSSI path (163) so that the IIR filter (250) with dynamic coefficient scaling can be time-shared between the RSSI path (163) and the power control data path (161).

    摘要翻译: 通过在主要数据路径(165),功率控制数据路径(161)和接收信号强度指示(RSSI)路径(163)之间的时间共享解调器硬件,可以实现整个功率控制数据路径(161) 在扩频器用户单元接收机的解调器(140)中,门数增加较少。 主数据路径(165)和功率控制数据路径(161)共时分配复共轭发生器(270),复数乘法器(280)和实部分量提取器(290)。 然而,由于时序要求,主数据路径的信道估计滤波器(240)不能与功率控制数据路径共享。 相反,动态系数缩放被添加到RSSI路径(163)中的无限持续脉冲响应(IIR)滤波器,使得具有动态系数缩放的IIR滤波器(250)可以在RSSI路径(163)和 功率控制数据路径(161)。

    Demodulator having an infinite-duration impulse response filter with dynamic coeffiecient scaling
    2.
    发明授权
    Demodulator having an infinite-duration impulse response filter with dynamic coeffiecient scaling 失效
    具有无限持续脉冲响应滤波器的解调器具有动态系数缩放

    公开(公告)号:US06243410B1

    公开(公告)日:2001-06-05

    申请号:US09089992

    申请日:1998-06-03

    IPC分类号: H04B1707

    摘要: By time-sharing demodulator hardware between a primary data path (165), a power control data path (161), and a received signal strength indicator (RSSI) path (163), an entire power control data path (161) can be implemented in a demodulator (140) of a spread spectrum subscriber unit receiver with a low increase in gate count. The primary data path (165) and the power control data path (161) time-share a complex conjugate generator (270), a complex multiplier (280), and a real component extractor (290). Due to timing requirements, though, the channel estimation filter (240) of the primary data path cannot be time-shared with the power control data path. Instead, dynamic coefficient scaling is added to an infinite-duration impulse response (IIR) filter in the RSSI path (163) so that the IIR filter (250) with dynamic coefficient scaling can be time-shared between the RSSI path (163) and the power control data path (161).

    摘要翻译: 通过在主要数据路径(165),功率控制数据路径(161)和接收信号强度指示(RSSI)路径(163)之间的时间共享解调器硬件,可以实现整个功率控制数据路径(161) 在扩频器用户单元接收机的解调器(140)中,门数增加较少。 主数据路径(165)和功率控制数据路径(161)共时分配复共轭发生器(270),复数乘法器(280)和实部分量提取器(290)。 然而,由于时序要求,主数据路径的信道估计滤波器(240)不能与功率控制数据路径共享。 相反,动态系数缩放被添加到RSSI路径(163)中的无限持续脉冲响应(IIR)滤波器,使得具有动态系数缩放的IIR滤波器(250)可以在RSSI路径(163)和 功率控制数据路径(161)。

    Digital FM demodulator
    5.
    发明授权
    Digital FM demodulator 失效
    数字FM解调器

    公开(公告)号:US5661433A

    公开(公告)日:1997-08-26

    申请号:US671036

    申请日:1996-06-27

    IPC分类号: H03D3/00

    CPC分类号: H03D3/006

    摘要: In the digital FM demodulator (330), a hard limiter (333) receives a modulated analog IF signal and limits the voltage of the IF signal to two levels. Next, a direct phase digitizer (336) uses zero-crossings of the limited IF signal to generate N-bit digital words. A phase differential circuit (340) computes the phase shift of the signal from the direct phase digitizer over a predetermined time interval. The dynamic range of the phase differential signal can be increased by replacing the phase differential circuit (340) with a high-resolution phase differential circuit (700). After digital demodulation and filtering and gain control by audio processor (360), the recovered signal is forwarded to a speaker (390) to produce an audio output. Thus, the digital FM demodulator both avoids problems common to analog discriminator circuitry and offers a reduced complexity, size, and power consumption alternative to conventional digital FM demodulators.

    摘要翻译: 在数字FM解调器(330)中,硬限幅器(333)接收调制的模拟IF信号,并将IF信号的电压限制为两个电平。 接下来,直接相位数字转换器(336)使用有限IF信号的过零点来产生N位数字字。 相位差电路(340)在预定时间间隔内计算来自直接相位数字转换器的信号的相移。 可以通过用高分辨率相位差分电路(700)代替相位差电路(340)来增加相位差信号的动态范围。 在通过音频处理器(360)的数字解调和滤波和增益控制之后,恢复的信号被转发到扬声器(390)以产生音频输出。 因此,数字FM解调器既避免了模拟识别电路的共同问题,又提供了与常规数字FM解调器相对应的降低的复杂性,大小和功耗。