In the first stage, due to the research in years on the magnetic field modulation type doubly fed brushless machine, two doubly fed generators was requested to fabricate 首先,利用我们研究所在磁场调制式无刷双馈电机的多年研究成果,研制并测试两台无刷双馈发电机。
The recognition method for analogue modulations has less computational complexity, and the method for digital modulation has flexibility and can be easily extended to the coming modulation types 本文的模拟调制识别算法具有运算量小的特点,而数字调制识别算法具有较好的扩展性。
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。
As the parts of sdr, such system should also be extensible . any modulation types, if can use complex carrier orthogonal modulation, such as am, ask, msk, qam, etc, can be used in the system 这种模型的可扩展性和移植性均很强,只须加入部分功能模块即可实现多种调制,文中给出了实现am、ask、msk和qam调制的具体算法。
Pulse signal is connected by the customer . signal can be sine wave or square wave . modulation frequency can be to 1mhz few model can be to 10mhz; inner modulation type no need signal from out side 外调制式激光器留有专用的信号接口,由用户接入脉冲信号,信号可以是正弦波,也可以是方波,调制频率可到1mhz个别型号调制频率可到10mhz。
The thesis presents automatic recognizing methods of modulation types based on statistic model which can enhance processing speed . frequency measurement through phase to recognize modulation types is another main work in this paper 另外,采用基于统计模式的方法做了调制类型自动识别,提高了处理速度;本文还给出了相位测频法进行调制类型识别和检测。
The thesis presents automatic recognizing methods of modulation types based on statistic model which can enhance processing speed . frequency measurement through phase to recognize modulation types is another main work in this paper 另外,采用基于统计模式的方法做了调制类型自动识别,提高了处理速度;本文还给出了相位测频法进行调制类型识别和检测。
To increase the spectrum efficiency of the ofdm system, a novel aofdm ( adaptive ofdm ) system, which can change its modulation type and length of guard interval according to the estimated channel information, is designed 为了提高ofdm的频谱效率,我们设计了一个能根据信道特征动态改变其调制方式以及保护间隔的自适应ofdm(aofdm,adaptiveorthogonalfrequencydivisionmultiplexing)系统。
For the digital modulation recognizer, the blind identification and equalization algorithm based on second-order statistics is applied to equalize the received signals firstly, and then the modulation type used can be figured out according to the shape of the rebuilt constellation 对于数字调制方式,本文首先采用基于二阶统计量的信道盲均衡算法对接收信号进行均衡,再利用信号星座图的形状判别具体的调制类型。
Some modulation parameters, such as the carrier frequency and the symbol rate, can be estimated prior to the recognition of modulation types . such other parameters as the modulation index, the modulation frequency deviation, and the signal broadband can be further estimated after recognition 部分调制参数如载波频率、符号速率在识别之前获得,在识别完成之后可以进一步估计调制指数、调制频偏、信号带宽等其余参数。