Under the concept of software defined radio , this dissertion brings forward a solution of the fsk modulation and demodulation fit for the transmitting and receiving of the railway control signal 从系统角度着眼,在软件无线电概念的框架下,结合理论基础提出了适用于列车控制信号发送与接收的fsk信号调制解调方案。
For low distortion , the drains ( or collectors ) of a differential amp " s front - end should be bootstrapped to the source ( or emitter ) so that the voltages on the part are not modulated by the input signal 为了得到低失真，差分放大器前端的漏极（或集电极）应该被引导到源极（或射极） ，这样端口电压就不会被输入信号调制了。
Automatic recognition of modulation signals is a required function of software - defined radio receiver . the automatic classification of modulation types is being discussed recently and there are so many ways 信号调制样式的自动识别是软件无线电接收机必须具备的功能之一，调制识别是近年来信号处理领域研究的热点问题。
From the point of view of the modulation of rppm , chaotic signal with stochastic characteristics is introduced as its modulation , which has the good performance just like the random signal 从随机脉位调制脉冲多普勒雷达信号调制角度出发，又引入了具有类随机性的混沌信号作为其基本调制信号，性能与采用随机信号相接近。
Automatic modulation recognition of communication signals is a new research direction in the signal analysis field , and it has a very widely applied foreground , especially , in the military communication realm 通信信号调制方式自动识别是信号分析领域中一个比较新的研究方向,它有很大的应用前景,尤其是在军事通信领域。
A globe procedure of the amr system has been introduced in this paper , based on the introduction , two new algorithms for carrier frequency estimation and one new algorithm for high - level digital modulation signal are proposed 在介绍前人工作的基础上，本文提出了两种新的载波频率估计方法和一种识别多进制数字通信信号调制模式的新方法。
Additionally , this paper also gives the realization method of software radio demodulation , the result of emulational analysis , the voluntarily identification technology of signal modulation way and the synchronous technology in software radio 另外，本文给出了软件无线电解调的实现方法和仿真分析结果及软件无线电中的同步技术和信号调制方式的自动识别技术。
Because frequency - shift signal is a kind of modulation signal , it ' s waveform is two ac sine signal of alternating i . e . upper frequency and lower frequency which was generated by low frequency modulating middle frequency 由于移频信号是一种调频信号，其波形为低频信号调制中心载频信号后产生的低端载频（下边频）和高端载频（上边频）两个交替变化的正弦交流信号。
But these modulation recognizers ca n ' t recognize the high - level digital modulation signals , a new recognizer is proposed to solve this question in this paper , the high - level digital modulation signals can be recognized by the new recognizer 针对已有的算法不能识别多进制数字通信信号的缺点，本文提出了一种新的算法，解决了多进制数字通信信号调制模式自动识别中的问题。
The detecting accuracy of the beam drift would be improved , as a high performance acoustooptic modulator modulates the frequency of the laser beam drift signal far away from the power frequency , the double power frequency and high frequency noises 具体包括: 1 .利用声光调制器将光束漂移量信号调制到远离工频及其倍频干扰和高频噪声的频带段,以期提高光束漂移量的检测精度。
