The new tracking algorithm decreases the computational complexity greatly, and increases the accuracy of the frequency synchronization.
新的频率跟踪算法降低了计算量，提高了频率同步的精确度。
Carrier frequency synchronization is one of the key techniques of OFDM system.
载波同步是正交频分复用系统的一项关键技术。
This paper chiefly studies joint symbol timing and carrier frequency synchronization.
本文主要研究载波和符号定时的联合同步。
The most important section of carrier recovery subsystem is carrier frequency synchronization.
载波频率同步是载波恢复的重要环节之一。
Then researched the non date assistance based algorithm:MLE frequency synchronization algorithm.
然后研究了基于非数据辅助的MLE频率同步算法。
But it is sensitive to synchronization error, and especially the frequency synchronization error.
但是OFDM对同步误差十分敏感，特别是对于频率同步误差。
This dissertation investigates the topic of time and frequency synchronization for OFDM and MIMO-OFDM systems.
准确的时间同步和精确的频率同步是OFDM系统和MIMO OFDM系统正常工作的前提。
Secondly, the timing synchronization algorithm for OFDM systems and frequency synchronization algorithm were researched.
其次对OFDM系统的定时同步算法和载波频率同步算法进行研究。
The frequency synchronization and sampling clock synchronization technique in high definition TV (HDTV) are investigated.
研究了高清晰度数字电视(HDTV)中的频率同步及采样钟同步技术。
A more precise estimation method of the Zero Doppler Time has been improved, and the frequency synchronization is achieved.
文章改进了零多普勒时间的估计方法，提高了其估计精度，从而较好地实现了频率同步。
The prerequisites of normal work of OFDM system are the precise time synchronization and the accurate frequency synchronization.
精确的时间同步和准确的频率同步是OFDM系统正常工作的前提条件。
There are two main aspects about OFDM synchronization technologies: symbol timing synchronization and carrier frequency synchronization.
OFDM系统有两个方面的同步要求，符号定时同步和载波频率同步。
As one of the most crucial technique of OFDM, synchronization technique includes carrier frequency synchronization and symbol synchronization.
同步技术是OFDM最关键的技术之一，它包括载波频率同步和符号同步。
To reduce EMI, a frequency synchronization pin allows multiple ICs from the family to self-synchronize or to synchronize to an external clock.
为了减少EMI，一个频率同步的引脚允许此系列的多重IC实现自同步或与外部时钟同步。
After coarse frequency synchronization, frequency offset compensation is carried out using variable step size least mean square algorithm (VLMS).
经过频率粗同步后，以变步长的最小均方算法(VLMS)进行频率补偿。
However OFDM and MIMO OFDM systems are very sensitive to time and frequency synchronization errors, especially the frequency synchronization error.
但OFDM系统和MIMO OFDM系统对时间和频率同步误差很敏感，特别是频率同步误差。
A new symbol timing and carrier frequency synchronization scheme applicable to orthogonal frequency division multiplexing (OFDM) system was presented.
针对正交频分复用(OFDM)系统提出了一种新的符号定时和载波频率同步算法。
The algorithm of MIMO-OFDM synchronization is also proposed with improved training sequences including frame synchronization and frequency synchronization.
同时也介绍了MIMO-OFDM系统中的同步技术，包括MIMO-OFDM帧同步和载波频率同步，并提出了改进的前导序列生成方法。
Phase errors is introduced in echo demodulation process because of the frequency synchronization error, and then, the final focus result will be deteriorated.
在接收端解调过程中，该频率同步误差会引入一定的相位误差，进而影响下一步的成像处理。
A new time and frequency synchronization method based on frequency domain correlation for an Orthogonal frequency Division Multiplexing (OFDM) system is presented.
该文根据频域相关的原理，提出了一种新的用于无线移动信道下的正交频分复用(OFDM)系统的时频同步算法。
A timing and frequency synchronization scheme based on FH sequence is proposed for the free space optical communication Orthogonal frequency Division Multiplexing (FSO-OFDM).
提出了一种基于FH序列的自由空间光通信多载波调制(FSO - OFDM)时间频率同步方案。
Therefore, it is of primary importance to accurately estimate this frequency offset and compensate for it prior to performing detection. This is the task of frequency synchronization.
由此可见，在检测之前对频偏进行准确的估计和有效的补偿是非常重要的，这便是频率同步所要完成的任务。
Estimating and compensating carrier frequency offset are to achieve carrier frequency synchronization. Estimating symbol rate and correcting timing error are used to synchronize symbol.
估计并补偿频偏是为了实现载波同步，估计符号率和校正定时误差是为了实现码元同步。
In the research and design of signal source, the key technology of the nature of broad spectrum, the same initial phase, and multi-frequency synchronization sending has been researched.
在信号源的研究与设计中针对信号源的广谱性质、起始相位同步、多频同步发送等关键技术进行了研究与设计。
Next, minimum mean square error (MMSE) filters are applied to the received signal to recover single user signal wave thus implementing user separation and frequency synchronization at the same time.
然后，对接收到的信号应用最小均方误差滤波恢复单用户信号波形，从而同时实现了多用户信号分离及频率同步；
Next, minimum mean square error (MMSE) filters are applied to the received signal to recover single user signal wave thus implementing user separation and frequency synchronization at the same time.
然后，对接收到的信号应用最小均方误差滤波恢复单用户信号波形，从而同时实现了多用户信号分离及频率同步；
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