Symbol synchronization for PPM is necessary for accurate demodulation.
符号同步是实现PPM正确解调的关键技术。
But OFDM is very sensitive to synchronization error, especially the symbol synchronization error.
但是OFDM对同步误差十分敏感，特别是符号同步误差。
In this paper, a new frequency and symbol synchronization algorithm for OFDM systems is proposed.
提出了一种正交频分复用(OFDM)系统的频率和时间同步算法。
Symbol synchronization is used to confirm OFDM symbol's initiative position for accurate demodulation.
符号同步是要确定OF DM符号的起始位置，从而进行正确的解调。
Finally, it corrected the following symbol synchronization according to the correlation peak location.
最后根据相关峰位置对后续码元进行同步修正。
The design of the resampling filter is a key technique for symbol synchronization in all-digital receiver.
重采样滤波器设计是全数字接收机中实现符号同步的关键技术之一。
However it is particularly sensitive to synchronization errors, especially errors in symbol synchronization.
但是OFDM对同步误差特别是符号同步误差十分敏感。
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 this paper, a novel symbol timing estimation algorithm is presented which realizes symbol synchronization by using a symbol.
本文提出了一种低复杂度的符号定时估计，利用一个训练帧来实现同步。
The system model is introduced and the probability of error in receiver as a function of symbol synchronization error is deduced.
给出了该系统模型，推导了PAM通信系统符号同步误差对收端误码率的影响。
This paper presents a Nyquist filter to perform symbol synchronization and matched filtering in a QAM demodulator for digital television.
本文设计了一种用于完成QAM数字电视解调芯片中符号及匹配成形功能的奈奎斯特滤波器。
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。
Therefore, this thesis focuses on investigating the frame (time-slot) synchronization and symbol synchronization techniques based on CMMB system.
本文将对基于CMMB系统的帧(时隙)同步和符号同步技术展开研究。
In this paper, the FIR variable fractional delay filter is designed and used to solve the problem of symbol synchronization of all digital receiver.
文中设计的FIR可变分数延迟滤波器用于解决全数字接收机的时钟同步问题。
The traditional digital signal demodulation method that realizes more complex has the problems of carrier recovery, symbol synchronization and so on.
传统的数字信号解调方法存在着载波恢复、符号同步等问题，实现起来较为复杂。
And then, the algorithm based on the interpolation of MPSK symbol synchronization, as well as the hardware implementation of the modules is introduced.
接着，介绍了基于内插的MPSK信号符号同步的算法，以及各模块的硬件实现。
The main contents of this dissertation are as follows: Chapter 2 investigates the symbol synchronization acquisition-aiding method with larger symbol rate offset.
全文的主要内容如下：第二章研究了大符号率偏差情况下的辅助符号同步捕获方法。
A novel symbol synchronization is presented with frame synchronization of PPM. On the basis of analyzing frame sync code pattern and length, a PPM frame scheme is designed.
在分析帧同步码型和长度要求的基础上，设计了一种PP M帧结构，提出了利用帧同步来实现PPM符号同步的方法。
An improved algorithm for symbol synchronization and symbol decision are proposed. Their performance at different level of SNR and frequency offset are discussed by simulations.
本文提出了一种改进的码元同步算法和改进的码元判决算法，通过仿真分析了它们的抗噪声和抗频偏性能。
Due to the obvious impact of frequency offset on PN sequences, based on the FH sequence, a symbol synchronization scheme with a conjugate symmetric training sequence is proposed.
针对频偏对PN序列相关性影响比较明显的问题，提出了一种利用FH序列构造的具有共轭对称性质的训练序列进行符号同步的方案。
Secondly, a DSTFT(Discrete Short Time Fourier Transform )-based demodulation method for the 2FSK signal is studied and algorithms for symbol synchronization and symbol decision are analysed.
重点研究了基于离散短时傅里叶变换解调2FSK信号的方法，分析了几种码元同步算法和码元判决算法。
At last, this paper analyses the delay correlation properties of 2fsk signal, and proposes a new algorithm for symbol synchronization, which shows better performance when frequency offset exists.
最后，从抗频偏的角度出发，通过分析2fsk信号的延迟相关特性，给出了一种码元同步算法，具有良好的抗频偏性能。
The OFDM is sensitive to the synchronization of the OFDM symbol and the carriers' frequency excursion.
OFDM系统存在对数据符号同步和载波频率偏移极为敏感的问题。
After a bandpass filter, QDPSK signal's symbol can be divided into steady section and transition section, so the demodulation and synchronization for the signal can be realized with DFT.
经过限带滤波后的QDPS K信号的码元波形可分为稳定区与过渡区，根据这一特点可以利用DFT方法来实现信号的解调和位同步。
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。
There are three kinds of synchronal modes in OFDM system: symbol timing synchronization, carrier synchronization, sampling-bell synchronization.
OFDM系统基本上有三类同步方式：符号定时同步、载波同步、采样钟同步。
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。
The proposed timing synchronization algorithms consist of frame synchronization and symbol timing.
本文的定时同步算法分为帧同步和符号定时两部分。
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。
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。
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