The method of hvdc small signal modulation is applied to enhance the small signal stability of the system ; the results are investigated based on the prony method 采用prony方法，研究了直流小信号调制对提高低频振荡阻尼的作用。
Automatic recognition of modulation signals is the key problem in non _ cooperative communication systems . it is the required function of software defined radio receiver 信号调制样式的自动识别是非协作通信中的主要问题,也是软件无线电接收机必备的功能之一。
In communications , a continuous frequency voltage or electromagnetic wave capable of being modulated or impressed with a second signal which carries the information to is transmitted 通信技术中一种连续的电压或电磁波,可用另一个携带有传送信息的信号调制或叠加。
The modulation recognition of communication signals is one of the key techniques of communication reconnaissance , and it is also an important task in the field of electronic warfare 通信信号调制方式的识别是通信侦察的关键技术之一,是目前电子战的重要研究课题。
And the spreading modulation , radiation signal modulation and choosing of waveform parameters are also discussed , which is the base of the receiver designing 同时对扩频调制方式、射频信号调制方式以及波形参量的选择进行了重点的论述，并对扩频通信系统的相关指标进行了计算。
In addition , based on fft and remainder algorithm , the modulation rate and initial frequency of sub - sampling uwb lfm signal are estimated unambiguously in negative snr 该方法通过fft和余数定理解频率模糊,解决了负信噪比条件下超宽带线性调频信号调制斜率和初始频率的估计问题。
The central computer can communicate with any single chip computer to acquire temperature data . 3 . modem module the modem module enable the system communicating through long distance 远程通信模块主要由单片的频移键控调制解调器构成，把数字信号调制成不同频率的模拟信号进行远距离传输。
So that , beyond certain snr and with enough received data , theoretically , our classification algorithms can recognize digital communication signals with any modulation order ’ 4 spsk信号与mask 、 mqam和mpsk信号调制子类间的关系表明，可利用2 4 spsk信号分类算法实现不同调制子类间的识别。
First , the paper studies the general platform of analog and digital communication signal modulation and demodulation based on software radio and verifies it with simulation by matlab 本文首先研究基于软件无线电的模拟、数字通信信号调制解调通用结构,并使用matlab编制了基于软件无线电调制解调仿真软件。
1 . the algorithms for identifying the type of modulation and estimating the radar signal parameters are studied . computer simulation is made to testify the feasibility of the methods 论文的主要工作如下: ( 1 )给出了信号调制类型的识别算法和不同信号的参数估计算法,通过计算机仿真,验证了该方法的可行性。
