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    Digital radio having improved modulation and detection processes
    12.
    发明授权
    Digital radio having improved modulation and detection processes 失效
    具有改进的调制和检测过程的数字无线电

    公开(公告)号：US5857003A

    公开(公告)日：1999-01-05

    申请号：US572513

    申请日：1995-12-14

    申请人： John A. Geiger ,  John P. Fischer ,  Michael L. Fetto

    发明人： John A. Geiger ,  John P. Fischer ,  Michael L. Fetto

    IPC分类号： H04L27/227 ,  H04L25/06

    CPC分类号： H04L27/2272

    摘要： There is provided a detection process for a digital radio which receives a multistate baseband signal comprising removing the low frequency information content of the baseband signal and subsequently restoring the low frequency information content to provide a conditioned baseband signal for detection so as to provide automatic frequency control for the radio on a manner avoiding loss of the low frequency information content of the baseband signal. This is accomplished by removing the low frequency information content of the baseband signal by high pass filtering to provide a filtered baseband signal, decoding the filtered baseband signal to provide decoded information signals in digital form, converting the decoded digital information signals to analog information signals, low pass filtering the analog information signals to recover the low frequency information content and adding the low pass filtered analog signal to the baseband signal to provide a conditioned baseband signal for detection wherein the conditioned baseband signal contains the low frequency information content.

    摘要翻译： 提供了一种用于接收多态基带信号的数字无线电的检测过程，包括去除基带信号的低频信息内容，随后恢复低频信息内容以提供经调理的基带信号进行检测，以便提供自动频率控制 以避免丢失基带信号的低频信息内容的方式。 这是通过通过高通滤波去除基带信号的低频信息内容来提供滤波后的基带信号，解码滤波后的基带信号以提供数字形式的解码信息信号，将解码的数字信息信号转换为模拟信息信号， 对模拟信息信号进行低通滤波以恢复低频信息内容，并将低通滤波的模拟信号加到基带信号上，以提供用于检测的条件化基带信号，其中条件基带信号包含低频信息内容。