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    • 1. 发明授权
    • Apparatus for detecting the presence or the absence of a digitally
modulated carrier, a corresponding receiver, and a corresponding method
    • 用于检测数字调制载波的存在或不存在的装置,相应的接收机以及相应的方法
    • US6081559A
    • 2000-06-27
    • US565045
    • 1995-11-30
    • Gerard LeclercDenis BlavetteDidier Lemaitre
    • Gerard LeclercDenis BlavetteDidier Lemaitre
    • H04L1/20H04L27/14H04L27/16H04L27/22
    • H04L1/206
    • The invention relates to apparatus for detecting the presence or the absence of a signal carrier wave received by a receiver. The carrier wave is modulated by a digital signal at a symbol clock frequency. According to the invention, the apparatus includes:a non-linear circuit receiving the received signal or the received signal after it has been frequency transposed, the non-linear circuit supplying in particular a signal whose frequency corresponds to the symbol clock frequency;a narrow-band filter centered on the symbol clock frequency and supplying a filtered signal;detection means for detecting the filtered signal and for supplying a detection signal; andcomparator means for comparing the detection signal with a reference value, the output signal from the comparator means constituting a signal indicating the presence or the absence of the carrier wave.The invention is particularly applicable to a receiver including automatic gain control apparatus placed upstream, and the indicator signal may optionally be applied to automatic frequency control apparatus.
    • 本发明涉及用于检测由接收机接收的信号载波的存在或不存在的装置。 载波以符号时钟频率的数字信号进行调制。 根据本发明,该装置包括:非线性电路在频率转换之后接收接收信号或接收信号,特别是提供其频率对应于符号时钟频率的信号; 以符号时钟频率为中心的窄带滤波器,并提供滤波信号; 检测装置,用于检测滤波后的信号并提供检测信号; 以及用于将检测信号与参考值进行比较的比较器装置,来自比较器装置的输出信号构成表示载波存在或不存在的信号。 本发明特别适用于包括放置在上游的自动增益控制装置的接收机,并且指示信号可以可选地应用于自动频率控制装置。