然后利用最大似然原则得到频偏估计。
Also the frequency offset was estimated based on maximum likelihood (ML) principle.
该算法能够同时实现时间同步与频偏估计。
The time synchronization and carrier frequency offset estimation can be achieved simultaneously.
同时通过合理设计训练序列的长度，可扩大频偏估计范围。
The estimation of frequency deviation range will be expanded with rational training sequence length.
本文研究OFDM分组传输系统的符号同步与频偏估计算法。
This paper investigated the timing and frequency offset estimation algorithm of OFDM burst transmission systems.
分析了现有的基于循环前缀的最大似然估计算法及其对频偏估计的跟踪。
Secondly, The ML algorithm based on CP in being and its tracking performance are analyzed.
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 research contents mainly consist of symbol rate estimation, carrier frequency offset estimation, modulation recognition and blind demodulation.
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。
A novel symbol synchronization and carrier frequency offset estimation method is presented for 39-tone OFDM systems.
验证了把CS(周期平稳过程算法)应用于选择性信道下进行频偏估计的可行性。
Demonstrating the feasibility using CS (Cyclostationary) algorithms to estimate frequency offset in selective channel.
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。
This paper focuses on carrier frequency offset estimation (CFO) and multiuser interference elimination in uplink OFDMA system based on generalized carrier assignment schemes.
理论分析和仿真表明该算法在保证估计精度的同时，可显著降低大频偏估计的计算复杂度。
Numerical analysis and simulations show that this algorithm reduces the computational complexity significantly for the estimation of large frequency offset while maintains a good performance.
本文主要研究适用于突发OFDM传输系统的同步技术，包括定时、频偏估计和信道估计。
The synchronization techniques for burst packet transmission mode OFDM systems is studied, including timing, frequency offset estimation and channel estimation.
由于分布式MIMO系统中可能存在多个频偏，使得其频偏估计和补偿问题变得更为复杂。
Since there may exist multiple CFOs in distributed MIMO systems, the CFO estimation and compensation become more difficult for this case.
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.
对于整数频偏估计，分析了一种基于序列自相关的算法，并将该算法推广应用到频率选择性信道中；
For integer frequency offset estimation, we analyze a sequence auto-correlation based algorithm, and extend the algorithm into frequency selective channel case.
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。
To reduce the impact of carrier frequency offset in OFDM system, this thesis designs a new carrier frequency offset estimation scheme for OFDM system.
首先分析上行链路中交织OFDM的信号结构，利用其周期性质导出特定的数据矩阵，实现频偏估计。
It analyzes interleaved uplink OFDM signal structure, utilizes its cyclic characteristic to form specified data matrixes, and implements the carrier frequency offset estimation.
本文就上述误差给出了估计方法，并介绍了在工程中使用DSP来实现频偏估计和同步的具体实现过程。
The thesis gives out the estimation methods based on the above errors and introduces the specific processes of using ADSP to realize the CFO and synchronization estimation.
提出了一种基于导频符号的多输入多输出正交频分复用(MIMO - OFDM)系统多频偏估计算法。
A multiple carrier frequency offsets (CFOs) estimation algorithm for multiple Input multiple Output Orthogonal frequency Division Multiplexing (MIMO-OFDM) systems based on pilot symbols was proposed.
同时，对利用导符号并结合判决数据进行频偏估计的算法也做了研究，判决数据的使用可以使估计结果更加精确。
The estimation algorithm using pilot symbols together with the decision data was also analyzed, and the accuracy of the estimation result can be improved by utilizing the decision data.
该文针对OFDM系统频偏估计中所产生的模糊度问题提出了一种基于符号间相位差分调制的频偏估计模糊度校正算法。
In this paper, a novel frequency ambiguity resolution algorithm in OFDM systems based on phase differential modulation between adjacent symbols is proposed to correct the frequency ambiguity.
第五章整数频偏估计，给出利用长训练序列进行估计的算法描述和仿真结论，结果表明本算法对整数频偏具有较好的估计精度。
Chapter 5 discusses the integer frequency offset estimation algorithm and it is proved that this algorithm has good estimation performance by simulation.
粗频偏估计算法基于DAB信号所特有的相位参考符号（PRS），细频偏估计算法基于OFDM 信号所特有的循环前缀（CP），对其它采用OFDM 技术的系统具有很好的通用性。
The algorithm for coarse estimation is based on the PRS that is only contained in DAB signal, while the algorithm for fine estimation is based on CP, which could also be used in other OFDM systems.
该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。
The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.
本文还研究了参数统计方法在估计通信信号的载波频偏和码元速率中的应用。
This dissertation also does research on the application in estimation of communication signals' carrier offset and symbol rate with the parametric statistical method.
随着多普勒频偏的增大，信道状况无法长时间保持平稳，伪码的完整相关已经不能满足信道估计的要求。
With increasing of Doppler frequency offset, status of channel doesn′t hold stabilization for long and whole correlation of false codes hasn′t satisfied require of channel estimation.
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。
The estimation of the coarse frequency offset and timing is one of the key technology in the uplink multiuser OFDM system.
提出一种适应于在加性高斯白噪声信道(AWGN)下遥测系统的多普勒频偏盲估计算法。
The blind estimation algorithm of Doppler frequency suitable for telemetry systems involving additional white Gaussian noise (AWGN) channels is proposed 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。
The ways of estimating the frequency offset and Doppler spread width in WCDMA system are studied in this paper.
提出一种针对多用户交织OFDM载频偏移估计的算法。
This paper proposes a carrier frequency offset estimation algorithm for interleaved multi-user OFDM.
最后着重分析了残留频偏的估计算法，分别在AWGN信道下和多径衰落信道下仿真，结果表明所提算法均有良好的性能。
The algorithm of residual frequency estimation is detailed, and simulation results verify the proposal algorithm with good performances in both AWGN and multipath fading channel.
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