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    • 1. 发明授权
    • Demodulator having an infinite-duration impulse response filter with dynamic coeffiecient scaling
    • 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
    • US06243410B1
    • 2001-06-05
    • US09089992
    • 1998-06-03
    • Christopher Peter LaRosaMichael John CarneyChristopher John Becker
    • Christopher Peter LaRosaMichael John CarneyChristopher John Becker
    • H04B1707
    • H04W52/42H04B1/707H04J13/00H04L25/0214H04L25/0226H04W52/60
    • 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).
    • 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)。