本文还对相干载波提取中的锁相环提出了一种改进方法。
It also give an improved method for PLL (phase locked loop) to extract coherent carrier.
载波同步是PS K信号相干解调中的一项关键技术，它直接关系到解调的指标。
Carrier synchronization is a key technique in the coherent -demodulation of PSK signals and it is directly related to the specification of demodulation.
在相干光正交频分复用系统中，本文提出了一种新型的基于循环前缀和虚载波的盲频偏估计方法。
A new blind frequency offset estimation method based on cyclic prefix and virtual subcarriers in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is presented.
PSK非相干解调法将经延时半个载波周期的接收信号与原接收信号相加，检测出两相邻码元载波相位变化情况，从而解调出数字信息。
Non coherent demodulation for 2PSK detects relation of carrier wave phase of the interval symbol by the (half period of carrier wave) delay and the adder, then the data is demodulated.
PSK非相干解调法将经延时半个载波周期的接收信号与原接收信号相加，检测出两相邻码元载波相位变化情况，从而解调出数字信息。
Non coherent demodulation for 2PSK detects relation of carrier wave phase of the interval symbol by the (half period of carrier wave) delay and the adder, then the data is demodulated.
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