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在载波信道上传输数字信号,为了获得较高的传输速率,通常采用相干检波,这就需要在接收端产生相干载波,即使接收信号经受频率偏移,载波仍须与接收信号准确定相。在接收端产生载波的过程叫载波恢复。下面就基群数传机的载波恢复作一概述。
In order to obtain higher transmission rate, coherent detection is usually used to transmit digital signals on the carrier channel. This requires generating a coherent carrier at the receiving end, and the carrier must still be phase-correct with the received signal even if the received signal undergoes frequency offset. The process of generating a carrier at the receiving end is called carrier recovery. Following on the basis of the number of carrier carrier recovery made an overview.