It is first time to adopt the high-speed frequency spread microwave network for China Seismological Bureau.
采用扩频微波方式组网在地震系统还尚属首次。
Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.
海洋水声信道是多途、时变和频散的信道。
The CDMA based on the radio frequency spread technique has been a very attractive multiple access technique in the radio communication field since 1990.
以无线扩频通信技术为基础的CDma技术，是进入90年代以来无线通信领域十分引入注目的多址通信技术。
Two kinds of typical wideband signal, Frequency Modulation (FM) signal and Frequency Spread signal, is analyzed qualitatively with wideband Ambiguity Function.
以宽带模糊度函数为工具定性地分析了两类典型宽带信号，即调频信号和频率分集信号。
The invention provides a device for reducing electromagnetic interference, comprising a receiving module, a first compare module and a frequency spread module.
本发明提供一种用于降低电磁干扰的装置，其中包含一接收模块、一第一比较模块以及一展频模块。
If the first frequency is higher than the second frequency, the frequency spread module upwards spreads on the first frequency, and downwards spreads on the second frequency.
如果该第一频率高于该第二频率，则该展频模块将该第一频率向上展频，并将该第二频率向下展频。
The first compare module is used for comparing the first frequency and the second frequency, and the frequency spread module is controlled by the compare result of the first compare module.
该第一比较模块用于比较该第一频率与该第二频率。该展频模块由该第一比较模块的一比较结果操控。
This chemo process is then horrifyingly spread through a phone virus, that rings cell phones and those on their contact lists, to sound a special frequency, that kills the listeners.
这种化疗过程随后通过一个电话病毒令人恐怖地传播开来，这个病毒使受到感染的手机及其通讯录中的其它手机响起一种特定频率的铃声，可以杀死接听者。
If the length of its cyclic prefix is larger than the delay spread of transmission channel, we can get a simple frequency equalizer to demodulate OFDM signal.
对于传统的OFDM系统来说，如果循环前缀的长度大于信道的时延扩散值，则可以通过简单的频域均衡来解调OF DM信号。
Based on a research institute of electronic technology 'project about TDRSS, in this thesis, carrier wave frequency acquisition of spread spectrum signal is studied and implemented.
本论文以某电子研究所研究项目为背景，主要研究了扩频信号载波频率捕获问题。
This paper reports a 31 bit low frequency SAW programmable tapped delay line. It is a key device in signal processing of interference free spread spectrum communication system.
文章报道的31位声表面波低频可程序抽头延迟线是一种用于扩频抗干扰通信系统所用的关键信号处理器件。
The ways of estimating the frequency offset and Doppler spread width in WCDMA system are studied in this paper.
本文主要研究了WCDMA(宽带码分多址)系统中频偏和最大多普勒频偏的估计方法。
Hopping frequency (FH) communication technology is the important part of spread spectrum communication, which is widely applied in anti-jamming communication.
跳频技术是扩频通信中的一种抗干扰的实用技术。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
主要有两种选择，直接序列扩频和跳频扩频。
An adaptive acquisition strategy for slow frequency hopping spread spectrum system is proposed.
提出了一种应用于跳频扩频系统的自适应捕获策略。
Spread spectrum has two distinct flavors: direct sequence and frequency hopping.
该技术有两个明显的变型：直接顺序与跳频。
It is a true blind detection algorithm in that it needs no knowledge of channel fading information as well as time domain and frequency domain spread spectrum codes.
该算法无需时域扩频码、频域扩频码和信道衰落信息，是一种真正意义上的盲的检测算法。
Because of limited frequency band of channel, spread spectrum and MFSK modulations can not resolve that high speed transmission is in contradiction with limited frequency band.
当进行高速水下通信时，由于水下信道的频带有限，扩频和MFSK调制方式无法解决高速率信息传输和可利用信道频带窄的矛盾。
A fast simulation environment has been developed using MATLAB and SIMULINK for behavioral level simulation of spread spectrum clock generator based Fractional-N frequency synthesizers.
提出了一种展频时钟生成的方法，使用MATLAB和SIMULINK开发出了快速模拟基于分数N型频率合成器的展频时钟生成器的环境。
Spread spectrum, frequency-hopped, which generates many codes over a wide frequency band.
它在很宽的频带上产生许多代码。
Reverse-spread spectrum device, time sequence inspection device, channel evaluation device and method for measuring frequency faults.
逆扩频装置，时序检测装置，信道估计装置和频率误差测量方法。
In many portable instruments, the noise and EMI of its switch power supply must be solved, the preferable method is that EMI power is reduced with spread spectrum frequency technique.
在许多便携式设备中，其开关电源的噪声和电磁干扰(emi)是亟待解决的问题，比较好的办法是利用扩频技术来减少EMI信号的功率成分。
This paper chooses China Shanghai 50ETF as the target to have a deep research on the high-frequency data of the spread between ETF's MV and IOPV.
本文选择华夏上证50ETF作为研究对象，研究上证50ETF二级市场价格和其基金净值之间价差的高频数据。
When the system close -loop controlling is realized for lower frequency perturbation, the approximate diffraction limited line spread function can again be achieved on the image plane.
对于低频扰动，当系统实现闭环控制后，像面上线扩散函数已接近衍射极限。
Simulation results showed that, with the same roughness of a tunnel, both the delay spread and the signal attenuation varied with the carrier frequency.
结果表明，隧道中信号传输的时延扩展和信号的衰减均与载波频率有关。
This paper introduces an AFC algorithm for a zero-intermediate frequency direct-sequence spread spectrum digital receiver.
为了使得射频源和波导管的频率保持一致 ，采用了自动频率控制系统 （AFC）。
Extensive simulations show that combining three diversity branches with proper frequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.
大量的仿真结果表明，三个分集结合适当的频率变化，降低了误码率的命令时，归一化多普勒扩展是大于0.3。
The generating of pseudo random sequence is one of the key subjects to realize the spread spectrum technique upgrade for BPC low frequency time code radio station.
伪随机序列的产生是实现BPC低频时码发播台扩展频谱技术升级的一个重要环节。
This new scheme has the advantages of high spectrum efficiency and suppression of multipath spread, frequency selective fading, jamming and noise.
该体制具有较高的频率利用率，可有效地抑制短波信道中多径时延、频率选择性衰落、人为干扰与噪声带来的不利影响。
The fundamental concept, technical characteristics and netting mode of Frequency Hopping Spread Spretum(FHSS)are introduced.
简要介绍跳频通讯技术（FHSS）的基本概念、技术特点及组网方式。
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