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    • 90. 发明授权
    • Equalizer for radio receive signal
    • 用于无线电接收信号的均衡器
    • US5297165A
    • 1994-03-22
    • US724612
    • 1991-07-02
    • Takashi UedaHiroshi SuzukiHitoshi Yoshino
    • Takashi UedaHiroshi SuzukiHitoshi Yoshino
    • H04L25/03H04B1/10H03C7/00
    • H04L25/03038H04L25/03019
    • In a transversal type equalizer having a series connected delay elements, multipliers are coupled with each output of each delay element and an adder adds outputs of the multipliers to provide an equalized output signal for equalizing a time division radio receive signal for every burst in mobile communication. A receive memory (11) stores the receive signal. A transversal type equalization process circuit (77a) is coupled with the output of the memory (11). A output memory (100) stores on equalized output signal. In training tap coefficients of a transversal filter, a tap or a delay element is precluded when an absolute value of a tap coefficient is less than a predetermined value, so that calculation amount for updating tap coefficients is decreased and tracking characteristics are improved. A multiplier (15) is inserted between an output of the receive memory (11) and an input of the equalization process circuit (77a) so that a signal which is subject to equalization is phase-shifted beforehand so that frequency offset between transmit frequency in a transmitter and local frequency in a receiver is compensated. The phase adjustment by the multiplier (15) depends upon residual phase error at an output of the equalization process circuit (77a). An output memory (100) is used as a training signal to initialize the tap coefficients of the equalization process circuit (77a) during a burst when equalized output signal has an error larger than a predetermined value.
    • 在具有串联连接的延迟元件的横向型均衡器中,乘法器与每个延迟元件的每个输出端耦合,并且加法器将乘法器的输出相加以提供均衡的输出信号,以均衡用于移动通信中的每个突发的时分无线电接收信号 。 接收存储器(11)存储接收信号。 横向型均衡处理电路(77a)与存储器(11)的输出端相连。 输出存储器(100)存储均衡的输出信号。 在训练横向滤波器的抽头系数时,当抽头系数的绝对值小于预定值时,排除抽头或延迟元件,从而降低更新抽头系数的计算量并提高跟踪特性。 在接收存储器(11)的输出端和均衡处理电路(77a)的输入端之间插入一个乘法器(15),使得经过均衡的信号被预先相移,使得发送频率之间的频率偏移 接收机中的发射机和本地频率被补偿。 乘法器(15)的相位调整取决于均衡处理电路(77a)的输出处的残留相位误差。 当均衡的输出信号具有大于预定值的误差时,输出存储器(100)用作训练信号以在突发期间初始化均衡处理电路(77a)的抽头系数。