So frequency offset must be removed prior to demodulation.
因此，解调前必须去除频率偏差。
Carrier frequency offset is one of the key problems in OFDM system.
载波频率偏移是OFDM系统实现的关键问题之一。
One of the principal disadvantage of OFDM is sensitivity to frequency offset.
OFDM的主要缺点是对载波频率偏差很敏感。
Also the frequency offset was estimated based on maximum likelihood (ML) principle.
然后利用最大似然原则得到频偏估计。
Firstly the carrier phase with frequency offset is obtained with a parallel method.
该算法利用并行方法估计有频差时的载波相位。
Frequency offset tracking is one of the key technologies that affect OFDM systems' performance.
频偏跟踪是影响到OFDM系统性能的关键技术之一。
The time synchronization and carrier frequency offset estimation can be achieved simultaneously.
该算法能够同时实现时间同步与频偏估计。
Time-selective Rayleigh fading of channels is caused by Doppler shift and carrier frequency offset.
接收端的高速运动或者载频的偏移，会引起信道的时间选择性衰落。
This paper proposes a carrier frequency offset estimation algorithm for interleaved multi-user OFDM.
提出一种针对多用户交织OFDM载频偏移估计的算法。
An algorithm suitable for carrier phase and frequency offset estimation in software radio is proposed.
提出一种适合软件无线电的载波相位和频差估计算法。
Doppler frequency offset is always the passive factor that cant be neglected in satellite communication.
多普勒频偏一直是卫星通信中不可忽视的消极因素。
In satellite mobile communications, Doppler frequency offset is a negative factor that couldn't be neglected.
在卫星移动通信中，多普勒频偏是一个不能忽视的消极因素。
The ways of estimating the frequency offset and Doppler spread width in WCDMA system are studied in this paper.
本文主要研究了WCDMA(宽带码分多址)系统中频偏和最大多普勒频偏的估计方法。
This paper investigated the timing and frequency offset estimation algorithm of OFDM burst transmission systems.
本文研究OFDM分组传输系统的符号同步与频偏估计算法。
A novel symbol synchronization and carrier frequency offset estimation method is presented for 39-tone OFDM systems.
针对短波39音OFDM系统，提出了一种新型的符号同步和载波频偏估计方法。
In a digital communication system, usually there exist carrier frequency offset between the sender and the receiver.
在数字通信系统中，发送端和接收端的载波往往存在一定的频差。
But OFDM is very sensitive to frequency offset and phase noise, so synchronization is the key problem for OFDM system.
但是OFDM技术对频率偏移和相位噪声很敏感，所以同步是OFDM系统中的关键问题。
The study shows that the algorithm can complete frequency offset tracking in AWGN channel and multipath fading channel.
研究表明，该算法既能在AWGN信道中也能在多径衰落信道中完成频偏跟踪工作。
The estimation of the coarse frequency offset and timing is one of the key technology in the uplink multiuser OFDM system.
上行链路中的粗频偏及定时估计是多用户OFDM系统的关键技术之一。
Frequency offset locking technology is widely applied in laser heterodyne detection and laser radar, which is of great value.
偏频锁定技术广泛应用于激光的外差探测、激光雷达等方面，具有重要应用价值。
Doppler compensation techniques: the large Doppler frequency offset can case the performance degraded in PN and carrier synchronizing.
多普勒频移补偿：大的多普勒频移会引起载波同步及伪码捕获性能的下降。
In this paper, the pilot subcarriers on two consecutive OFDM symbols are utilized for joint frequency offset correction and channel estimation.
基于连续OFDM符号上的导频子载波，给出了联合频率偏移纠正和信道估计方法。
The study shows that the new algorithm is not affected by carrier frequency offset basically, and has strong characteristic of resisting noise.
研究表明，新算法的性能基本不受载波频偏的影响，且具有很强的抗噪特性。
The most critical causes yielding the ISI as well as ICI are symbol timing and carrier frequency offset which are occurred in the OFDM receiver.
而产生ISI和ICI的主要原因是在OFDM系统接收端产生的符号定时偏差和载波频率偏差。
Symbol timing and carrier frequency offset will significantly degrade the performance of OFDM(Orthogonal Frequency Division Multiplexing)receiver.
符号、载波偏移严重影响着正交频分复用（OFDM）接收系统的性能。
Base on structure characteristics of the training sequence, a quite accurate frequency offset can be obtained through a data correlation operation.
通过数据相关运算，结合构造训练序列的特点，得出比较准确的频率偏移值。
Based on joint time and frequency offset estimation, a reliable signal detection scheme is obtained by modulated pilot symbols using an m-sequence.
方案利用时频联合估计来得到可靠的信号检测，并从导频符号估计时间和频率偏移。
But because of the sensitivity to the carrier frequency-offset, very small frequency offset will destroy the performance of the OFDM system, badly.
但是，OFDM对载波频偏非常敏感，很小的载波频偏都会严重影响OFDM系统性能。
However, OFDM is sensitive to timing and frequency offset, so how to overcome this limitation is one of the main directions of the research on OFDM.
但OFDM技术对定时和频率偏移敏感，如何克服这个缺点是OFDM技术研究的主要方向之一。
To reduce the impact of carrier frequency offset in OFDM system, this thesis designs a new carrier frequency offset estimation scheme for OFDM system.
为了减小正交频分复用系统受频率偏差的影响，在OFDM系统中设计了一种新的载波频偏估计算法。
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