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。
The desired user's signal waveform is utilized to ensure optimal recovery of the user's symbol information.
对期望用户信号波形的使用保证了用户符号信息的最优恢复。
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 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。
The problems mainly exhibit to be multi-path propagation in the wireless fading channel, signal fading caused by the scattering and Inter-Symbol Interference caused by the long multi-path time delay.
其中主要为无线衰落信道中的多径传播和散射引起的信号衰落，以及大的多径时延而引起的符号间干扰。
However, because of the inherent memory effect of CPM signal the traditional pilot symbol encoding rule is not feasible.
由于CPM信号固有的记忆效应，传统的引导码元编码规则对它不适用。
Theoretical analysis and practical signal processing justify the effectiveness of the new symbol rate estimation algorithm.
理论分析和实测信号处理证明了提出算法的有效性。
DMPSK signal processing algorithm based on multiple-symbol detection used to be an effective way to prevent deterioration of the system detection properties.
基于多符号检测的DMPS K信号处理算法在改善系统检测性能方面是一条行之有效的方法。
The OFDM signal includes multiple symbols, each symbol having a plurality of closely- spaced, orthogonal data sub-carrier signals carrying data.
OFDM信号包括多个符号，每个符号具有多个携带数据的近间隔的正交数据子载波信号。
Because of the high algorithm complexity, the slow convergence and the signal or symbol obscure problem of the blind channel estimation, it is not suitable in practical use.
由于盲信道估计算法复杂度高，收敛时间长且存在信号或符号的不确定问题，不适于在实际中应用，因此本文主要研究的是基于导频的信道估计。
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。
Each pilot sub - carrier signal is placed at a different sub-carrier signal location for each successive symbol duration of the OFDM signal to form a sliding pilot sub-carrier signal.
对于OFDM信号的每个连续符号持续时间，每个导频子载波信号放在不同的子载波信号位置，以形成滑动导频子载波信号。
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。
A new algorithm based on the traditional maximum-selection method is proposed. This method despreads and demodulates the IF sampled signal simultaneously by multi -symbol accumulation.
提出在传统的择大判决法的基础上，用多码元累加方法对中频采样信号直接进行同时解扩解调。
The received signal is often corrupted badly by inter-symbol interference in the multipath fa- ding wireless channel circumstance.
数字通信系统中多径衰落的无线信道环境通常会使接收信号受到严重的码间干扰。
In wireless communication system, Inter-symbol Interference is serious and signal is distorted extremely because of fading channel resulted in by the effect of multipath.
在无线通信系统中，由于多径效应常常引起信道衰落，直接结果是码间干扰非常严重。
In wireless communication system, Inter-symbol Interference is serious and signal is distorted extremely because of fading channel resulted in by the effect of multipath.
在无线通信系统中，由于多径效应常常引起信道衰落，直接结果是码间干扰非常严重。
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