In this article, PLL theory, design of loop filter and phase noise theory are introduced at first.
本文先介绍了锁相环的工作原理，环路滤波器的设计并对相位噪声的理论进行了阐述。
Significant results in the key technologies of OFDM, such as carrier synchronization, channel estimation, phase noise and so on have achieved in theory and practice.
有关OFDM的关键技术，如载波同步、信道估计、相位噪声等，在理论和实践方面均取得了很显著的成果。
Time delay method was used to reconstruct the phase space of underwater noise time series based on nonlinear dynamics theory.
以非线性动力学理论中的相空间重构理论为基础，利用延时法对水下噪声时间序列信号进行了相空间重构。
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