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。
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。
The offset of carrier frequency can cause interference between subchannels in a multicarrier system.
对于多载波系统，载波频率的偏移会导致子信道之间产生干扰。
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。
A joint blind estimation method based on spectrum overlap for uplink interleaved orthogonal frequency division multiple access carrier frequency offset and timing synchronization is proposed.
提出了一种基于功率谱叠加的交织正交频分多址系统上行链路载波频偏和定时同步联合估计算法。
The orthogonal multicarrier modulation, which is the main character of OFDM, determines that it is very sensitive to both timing synchronization error and carrier frequency offset.
OFDM系统自身的正交多载波调制特点，决定了其对定时误差和载波频率偏差十分敏感。
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。
This thesis deals with the algorithms of carrier frequency offset and phase error for MPSK signal.
本文主要研究MPSK信号的载波频偏和相位误差的估计和恢复算法。
Doppler effect causes not only carrier frequency offset, but also symbol expansion or compression for wideband acoustic communication signal.
多普勒不仅造成宽带水声通信信号的载波频率偏移，而且引起码元符号的展宽或压缩。
The influences of frequency offset and phase offset on communications are discussed, and then a novel algorithm for recovering the carrier based on the false frequency offset is presented.
推导并分析了频偏、相偏对通信系统的影响，提出了一种新的基于伪频偏概念的载波恢复算法。
In communication systems, the synchronization of the receiver requires to accurately estimate a number of parameters such as the carrier frequency and phase offset.
在通信系统中，接收机的同步要求精确地估计一些参数，比如载波频率和相位偏移。
The research contents mainly consist of symbol rate estimation, carrier frequency offset estimation, modulation recognition and blind demodulation.
研究内容主要包括：符号率估计、载波频偏估计、调制方式识别以及盲解调等。
The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
结果表明，用该算法可以精确估计载波相位和频差，有效地降低系统的误码率。
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。
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。
We describe the synchronization technique in several keys including symbol timing, carrier frequency offset estimation and sampling clock offset estimation.
符号定时同步技术，载波频率同步技术和采样钟同步技术等几个方面。
The invention relates to a method and a system for compensating a carrier frequency offset in an orthogonal frequency division multiplexing (OFDM) receiver.
本发明涉及在正交频分复用（OFDM）接收机中补偿载波频率偏移的方法和系统。
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。
As a method of the adjustment of time offset, power information and carrier frequency offset in the uplink, ranging plays an important role in the system.
测距作为上行链路调整时间偏置、功率信息和载波频率的一种方法，对系统起了很大的作用。
Various existing synchronization algorithm to estimate symbol timing offset and carrier frequency offset can be classified into blind and pilot-aided methods and algorithm based on cyclic prefix.
目前，估计载波频率偏差和符号定时偏差的算法主要有数据辅助的方法和非数据辅助的方法以及基于循环前缀的算法。
This paper focuses on carrier frequency offset estimation (CFO) and multiuser interference elimination in uplink OFDMA system based on generalized carrier assignment schemes.
本文针对上行链路任意分配子载波重点研究了载波频偏估计和多用户间干扰消除的方法。
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。
But if the Doppler frequency offset exceed the capture range of PLL, the carrier synchronization will fail.
但是，一旦多普勒频移超出了锁相环的频率捕捉范围，就无法完成载频同步。
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。
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。
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。
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。
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。
The problems of carrier frequency offset estimation under the condition of the AGWN channel, frequency flat-fading channel and frequency selective-fading channel are studied in detail respectively.
本文仔细研究了在高斯白噪声信道下、频率平坦衰落信道下和频率选择性衰落信道下高精度估计信号载频偏差的问题，并对相应算法提出了一些改进办法。
The method was Correlate search and FFT carrier detection, which could solve the problem of the capture of the spread spectrum code under the condition of low SNR and big frequency offset.
方案中提出了：相关搜索、FFT检测信号载波的方法，解决了低信噪比、大频差条件下扩频码的同步捕获难题；
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