在噪声环境下，分析了载波频差对码跟踪环输出的影响。
Then we discuss the influence of frequency offset on code loop in the noisy environment.
实验表明，这一方案能够控制光WDM通信系统中的载波频移。
The results of experiments have shown that the design can control well the frequency drift in optical WDM systems.
但两者都对载波频率偏移敏感，且在AWGN和多普勒频移环境下表现相当。
But both of them are sensitive to carrier frequency shift, further, they have comparative BER under AWGN and Doppler shift environment.
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.
提出了一种新的正交频分多路（OFDM）传输系统定时和载波频率捕获联合算法。
This paper describes a novel joint acquisition algorithm of timing and carrier frequency for burst orthogonal frequency division multiplexing (OFDM) transmission system.
提出一种在零前缀正交频分复用（ZP-OFDM）系统中，估计符号定时和载波频偏的算法。
The methods propose to utilize the zero padding prefix(ZP) characteristic of ZP-OFDM systems.
本文研究了自适应正交多载波频分复用（AOFDM）中根据估计出的信道特性选择调制方式的问题。
The problem of how to choose the constellation size based on the estimated channel qualities in AOFDM systems is addressed in this paper.
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.
可估计的载波频差范围是大的，约为符号率的，并且算法所需的计算负载非常低，适合数字硬件实现。
Its estimation range is large, about of the symbol rate, while the algorithm proposed requires a very low computational load and is very easy to implement with digital hardware.
实践表明：利用一种改进的FFT校频技术对载波频偏进行一次校频，能使载波频偏快速落入锁相环快捕带内。
It has been proved that an improved FFT frequency correction technology, which makes carrier frequency deviation come into fast capture bandwidth quickly, is presented to correct frequency.
利用计算机仿真方法详细分析不同噪声环境下，载波频差对码跟踪环路输出、码相位差对载波跟踪环路等因素的影响；
Then the influence of carrier frequency error on code loop and influence of code phase error on carrier loop in different noise are discussed in simulation.
本文研究了收发双方存在载波频差时利用累积量实现调制分类这一实际问题，提出一种改进的基于累积量的信号分类算法。
An improved algorithm for classification of MDPSK signals based on cumulants is presented in this paper, which is robust to the error of the carrier synchronization.
正交频分复用(OFDM)技术、单载波频域均衡技术(SC -FDE)和多天线技术都是有助于达到这一目标的有效技术。
Orthogonal frequency division multiplexing (OFDM), single carrier frequency domain equalization (SC-FDE) and multiple antennas technique are efficient techniques to achieve this goal.
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.
本文针对有载波偏移的零中频bps K调制信号提出了一种软件解调系统。
The paper presented a software demodulating system of BPSK zero-IF signal containing carrier offset.
载波同步是正交频分复用系统的一项关键技术。
Carrier frequency synchronization is one of the key techniques of OFDM system.
色同步信号是为了在接收端恢复与发送端被抑制掉的色副载波同频同相的载波而设置的。
Color synchronous signal is setup to resume subcarrier color signal as same frequency and phase in receive end, which is suppressed in send end.
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。
In a digital communication system, usually there exist carrier frequency offset between the sender and the 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。
Symbol timing and carrier frequency offset will significantly degrade the performance of OFDM(Orthogonal Frequency Division Multiplexing)receiver.
扼要介绍关于光频载波的初步的实验研究工作。
Briefing of initial experimental study on optical carriers is also given.
提出一种适合软件无线电的载波相位和频差估计算法。
An algorithm suitable for carrier phase and frequency offset estimation in software radio is proposed.
提出利用正交频分复用(OFDM)多载波调制方式代替单载波调制方式对信息进行处理。
The OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier modulation is used to process messages instead of the traditional single carrier modulation.
为了解决水文巡测设备中数据传输的可靠性，电力载波通讯中的单频阻波器技术被应用到巡测设备上。此法简单易行，稳定可靠。
Single - frequency resistance - wave technique has been introduced from power - driven carrier wave communication to patrol - measurement, thanks to its easy manipulation and stable reliability.
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。
The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
该算法利用并行方法估计有频差时的载波相位。
Firstly the carrier phase with frequency offset is obtained with a parallel method.
在基于频域导频的信道估计中，研究了导频子载波处的信道估计方法和数据子载波处的信道估计方法。
In the frequency domain pilot channel estimation, this thesis studies the pilot subcarrier and data subcarrier channel estimation algorithms.
基于连续OFDM符号上的导频子载波，给出了联合频率偏移纠正和信道估计方法。
In this paper, the pilot subcarriers on two consecutive OFDM symbols are utilized for joint frequency offset correction and channel estimation.
对于高精度测量和导航，GPS载波相位整周模糊度的快速求解仍然是一个难点，尤其对于单频接收机。
GPS carrier phase integer ambiguity fast resolution is still the key issue and challenge for high accuracy survey and navigation, especially for single frequency receiver.
该方案利用频移键控频分复用（FSK FDM）技术进行声频副载波调制，通过光强度调制实现远程在线EDFA监控信息随主信号的传输。
In the scheme, FSK-FDM technique is used in subcarrier modulation, and the EDFA's supervisory information is transmitted by optical intensity modulation.
该方案利用频移键控频分复用（FSK FDM）技术进行声频副载波调制，通过光强度调制实现远程在线EDFA监控信息随主信号的传输。
In the scheme, FSK-FDM technique is used in subcarrier modulation, and the EDFA's supervisory information is transmitted by optical intensity modulation.
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