符号同步是实现PPM正确解调的关键技术。
Symbol synchronization for PPM is necessary for accurate demodulation.
但是OFDM对同步误差特别是符号同步误差十分敏感。
However it is particularly sensitive to synchronization errors, especially errors in symbol synchronization.
但是OFDM对同步误差十分敏感，特别是符号同步误差。
But OFDM is very sensitive to synchronization error, especially the symbol synchronization error.
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.
利用有限的导频信号进行信道延迟估计从而获得准确的符号同步。
Channel delay estimation via pilot sub-carriers is used to provide accurate frame synchronization in multipath channels.
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。
The OFDM is sensitive to the synchronization of the OFDM symbol and the carriers' frequency excursion.
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。
The design of the resampling filter is a key technique for symbol synchronization in all-digital receiver.
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。
Symbol synchronization is used to confirm OFDM symbol's initiative position for accurate demodulation.
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。
Therefore, this thesis focuses on investigating the frame (time-slot) synchronization and symbol synchronization techniques based on CMMB system.
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。
As one of the most crucial technique of OFDM, synchronization technique includes carrier frequency synchronization and symbol synchronization.
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。
The system model is introduced and the probability of error in receiver as a function of symbol synchronization error is deduced.
根据LDPC码译码算法的统计特性，提出了一种新的符号同步误差校正算法。
Based on the statistical properties of LDPC decoding algorithm, a new timing error recovery algorithm is presented.
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.
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。
And then, the algorithm based on the interpolation of MPSK symbol synchronization, as well as the hardware implementation of the modules is introduced.
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。
The traditional digital signal demodulation method that realizes more complex has the problems of carrier recovery, symbol synchronization and so on.
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。
The main contents of this dissertation are as follows: Chapter 2 investigates the symbol synchronization acquisition-aiding method with larger symbol rate offset.
CD MA通信系统接收机的初始同步包括PN码同步、符号同步、帧同步、和扰码同步等。
Initial synchronisms of CDMA communication system receiver include PN code sync, symbol sync, frame sync, sync of scramble code, and so on.
在符号同步其它性能指标不变的情况下，该算法大大地减少了运算量、缩短了同步建立时间。
When other performance indexes is fixed, the algorithm greatly decreases the mounts of calculation and shortens the synchronization establishing time.
该算法的定时尺度曲线仅在正确定时点处出现一个尖峰，大大提高了分辨率，从而可以更加准确的进行符号同步。
The timing curve of this algorithm will present a spike pulse only at the right time, the resolution is greatly enhanced, so the symbol timing will be more accurate.
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。
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.
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。
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.
其中软件算法部分全部在主机CPU中实现，其中包括信道初始化，比特分配策略，符号同步，信道均衡，回波抵消，编码解码，FFT和IFFT等等。
The software algorithms are realized in host CPU, including channel parameters estimation, bit allocation, equalization, echo cancellation, FFT, IFFT, encoding, decoding, etc.
与同步调用类似，InvalidSymbolException指示请求已到达服务提供程序，该提供程序抛出业务异常，指示符号无效。
Similar to a synchronous invocation, InvalidSymbolException indicates that the request has reached the service provider, which has thrown a business exception stating that the symbol is invalid.
OFDM系统的训练符号定时同步算法是一种传统的定时算法。
The timing synchronization algorithm of training symbols for the OFDM systems is an old timing algorithm.
提出了一种新的无线信道下基于循环前缀的正交频分复用系统符号定时同步算法。
A symbol timing algorithm for orthogonal frequency division multiplexing (OFDM) systems with the cyclic prefix under wireless channels is proposed.
介绍了一个针对同步时序电路VHDL设计的性质验证的解决方案——一个有效的符号模型判别器veris。
A solution for property verification of synchronous VHDL design is introduced, and VERIS an efficient symbolic model checker is implemented.
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。
A new symbol timing and carrier frequency synchronization scheme applicable to orthogonal frequency division multiplexing (OFDM) system was presented.
本文主要研究载波和符号定时的联合同步。
This paper chiefly studies joint symbol timing and carrier frequency synchronization.
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。
We describe the synchronization technique in several keys including symbol timing, carrier frequency offset estimation and sampling clock offset estimation.
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。
In this paper, a novel symbol timing estimation algorithm is presented which realizes symbol synchronization by using a symbol.
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