VFCT? Voice Frequency Carrier Telegraph?
影片载波电报?。
One way to get such a signal into a human may be through use of a high frequency carrier frequency.
一种将这种信号传入人脑的方法是通过加载了高频的频率。
At last, an intelligentized testing instrument for electric wire high frequency carrier wave channels is developed.
在此基础上，研制开发出了一套智能化电力线高频载波通道测试装置。
The dual-frequency carrier phase observation equation is built and ionosphere-free predigested, the estimate formula of zenith wet delay is deduced with least square method.
建立了双频载波相位观测模型，并将其进行无电离层延迟化简，用最小二乘原理推导了天顶湿延迟的估值公式。
The principle of cascade H-bridge converter is analyzed. Variable-Frequency Carrier Bands PWM(VFCB-PWM) technique is discussed. Cascade H-bridge converter based on VFCB-PWM technique is proposed.
分析了级联H桥型变换器的工况，讨论了载波带频率变化的PWM（VFCB-PWM）技术，提出了基于VFCB-PWM技术的级联H桥型多电平变换器。
Channel n (where n is 0...78) uses a carrier frequency of 2402+n MHz.
信道n（n为0...78）使用的载波频率为2402+nMHz。
Baseband is a network technology in which only one carrier frequency is used.
基带是一种网络技术，其中只有一个载波频率的使用。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
The former realizes steady transmission of signal by testing and analysing the carrier channel's frequency characteristic .
前者是通过对载波信道的频率特性时变性测试、分析，实现信号平稳传输。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
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.
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。
But both of them are sensitive to carrier frequency shift, further, they have comparative BER under AWGN and Doppler shift environment.
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。
Finally, these judged variables adjust the local oscillating frequency to track the carrier frequency by NCO.
最后用这些变量调节本地振荡频率，以跟踪载波频率。
In wireless communication system, there is a large frequency bias between carrier frequency and local oscillating frequency. AFC is contributed to eliminate it.
在无线移动通信中，接收机的本地振荡频率和载波频率之间往往存在较大的频率偏差，AFC用于克服此频偏。
The most critical causes yielding the ISI as well as ICI are symbol timing and carrier frequency offset which are occurred in the OFDM receiver.
而产生ISI和ICI的主要原因是在OFDM系统接收端产生的符号定时偏差和载波频率偏差。
The small signal analysis of laser diode type all optical wavelength converter is presented using carrier depletion, and the frequency response function is given.
理论上基于载流子消耗机制，对激光器型波长转换器进行了小信号分析，给出了频率响应函数。
Carrier frequency offset is one of the key problems in OFDM system.
载波频率偏移是OFDM系统实现的关键问题之一。
It will be affect the range processing that the frequency agile of carrier in frequency agile signal arouse the variety of Doppler frequency, so the compensate of velocity door is obligatory.
跳频信号中载频的跳变会引起多普勒频率的变化，这对距离的处理产生影响，必须进行速度门的处理。
Carrier frequency synchronization is one of the key techniques of OFDM system.
载波同步是正交频分复用系统的一项关键技术。
Then we detect and estimate the carrier frequency of negative SNR DS-SS Signal have done. Theoretic analysis and simulation prove the validity of the arithmetic.
理论分析和仿真实验证明，在负信噪比条件下该方法可有效提高对DS-SS信号载波的检测能力。
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。
We propose new carrier frequency acquisition and channel estimation algorithms based on the time-domain analysis of OFDM system.
本文根据OFDM系统特点，分析了OFDM系统的时域载波频率捕获和信道估计方法。
The offset of carrier frequency can cause interference between subchannels in a multicarrier system.
对于多载波系统，载波频率的偏移会导致子信道之间产生干扰。
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 a digital communication system, usually there exist carrier frequency offset between the sender and the receiver.
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。
It directly processes the phase of the received signal and realize fast capture of the carrier frequency and keeping the carrier phase.
它直接对接收信号的相角进行处理，以完成载波频率的快速捕获和载波相位的跟踪。
To reduce the impact of carrier frequency offset in OFDM system, this thesis designs a new carrier frequency offset estimation scheme for OFDM system.
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。
Refraction correction carrier phase measurements is composition of two different sets of fundamental frequency wide-lane carrier phase measurement.
折射校正载波相位测量是由两组不同的基本频率宽巷载波相位测量组成。
The most important section of carrier recovery subsystem is carrier frequency synchronization.
载波频率同步是载波恢复的重要环节之一。
The most important section of carrier recovery subsystem is carrier frequency synchronization.
载波频率同步是载波恢复的重要环节之一。
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