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    • 4. 发明授权
    • Modulation circuit for a digital radio communications apparatus using a
phase shifted DQPSK modulation system
    • 用于使用相移DQPSK调制系统的数字无线电通信装置的调制电路
    • US5363410A
    • 1994-11-08
    • US888028
    • 1992-05-26
    • Takahisa Hayashi
    • Takahisa Hayashi
    • H04L27/20H03C3/02
    • H04L27/2046
    • A modulation circuit includes a mapping position detector as well as a circuit for differentially phase coding a plurality of separated data streams. The differentially phase coding circuit is adapted to differentially phase code the plurality of data streams for each pulse time and generate a coded signal containing amplitude information. The mapping position detector detects the phase mapping position of the coded signal based on the amplitude information in the coded signal which is output from the differentially phase coding circuit. Information representing the detected phase mapping position is supplied to the differentially phase coding circuit so as to achieve a differential phase coding at a pulse time following one pulse time.
    • 调制电路包括映射位置检测器以及用于对多个分离数据流进行差分相位编码的电路。 差分相位编码电路适于在每个脉冲时间对多个数据流进行差分相位编码,并产生包含振幅信息的编码信号。 映射位置检测器基于从差分相位编码电路输出的编码信号中的振幅信息,检测编码信号的相位映射位置。 表示检测到的相位映射位置的信息被提供给差分相位编码电路,以便在一个脉冲时间之后的脉冲时间实现差分相位编码。