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一、同步系统的内容在我们试制的选址通信系统中,一次调制采用数字式增量调制,二次调制采用伪随机码,同时还有加密装置。这样,发送端的信号是以离散的数字波形一个接一个地发送出去,因此,在接收端接收离散的数字波形并解调时(增量调制解调,加密的恢复),就需要有与发送端频率相同的节拍信号,即钟脉冲,这种节拍信号(即钟脉冲)就叫做码元同步信号。发送端的节拍脉冲(钟脉冲)产生及接收端的节拍脉冲的提取的系统称为码元同步系统。
First, the content of the synchronization system In our trial site selection communication system, a modulation using digital incremental modulation, the second modulation using pseudo-random code, as well as encryption device. In this way, the sender’s signal is discrete digital waveform sent one by one out, so receiving the discrete digital waveform and demodulation (incremental modulation and demodulation, encryption recovery), you need to have the sender Beat the same frequency signal, the clock pulse, the beat signal (ie, clock pulse) is called the symbol synchronization signal. The system that generates the beat pulse (clock pulse) at the transmitting end and the beat pulse at the receiving end is called the symbol synchronization system.