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    • 4. 发明授权
    • CDMA modulation method and device therefor
    • CDMA调制方法及其装置
    • US06833770B1
    • 2004-12-21
    • US10129789
    • 2002-05-10
    • Shusaku FukumotoTakashi NakaiShunsuke Araki
    • Shusaku FukumotoTakashi NakaiShunsuke Araki
    • H04L2720
    • H04B1/707H04B2201/70707
    • A CDMA complex QPSK spread modulation method and apparatus are provided, which can be operated on a reduced gate scale with reduced power consumption. Digital data signals are spread modulated by multipliers, with the first spreading codes generated from first spreading code generators, so as to produce spread modulated signals. These spread modulated signals are input to a complex QPSK processor where they are subjected to a complex QPSK operation with second spreading codes generated from second spreading code generators. The resultant signals are filtered through low-pass filters. Digital-to-analog converters convert the filtered signals into analog values. Signals including the QCH data signal are processed through multipliers so as to weight them with a gain factor G from a gain factor controller.
    • 提供了一种CDMA复合QPSK扩展调制方法和装置,其可以以降低的功率消耗在减小的栅极尺寸上操作。 数字数据信号由乘法器进行扩频调制,第一扩展码由第一扩展码发生器产生,以产生扩展调制信号。 这些扩展调制信号被输入到复QPSK处理器,在这里它们经受来自第二扩展码发生器的第二扩展码的复QPSK操作。 所得信号通过低通滤波器进行滤波。 数模转换器将滤波后的信号转换为模拟值。 包括QCH数据信号的信号通过乘法器进行处理,以便从增益因子控制器以增益因子G对它们进行加权。