modulation type造句
例句与造句
- 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。 - It's difficult to find modulation type in a sentence. 用modulation type造句挺难的
- 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。 - take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated . an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization . how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了载波同步和码元定时同步与调制方式盲检测算法的关系；以自适应单载波中高阶累积量调制方式盲检测算法为例，对于载波同步误差引起的频偏问题，提出一种基于频偏稳健的mdpsk信号调制方式盲检测算法；对于未知调制方式信号的定时同步问题，提出一种盲定时估计算法，该算法可以估计mdpsk和mqam信号的定时同步信息，实现数字信号的同步分类；提出了一种基于调制方式盲检测的自适应接收机结构，把调制方式盲检测，信噪比估计和同步解调联合起来进行，实现调制方式随信道质量而自适应变化的信号的正确接收。 - take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated . an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization . how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了载波同步和码元定时同步与调制方式盲检测算法的关系；以自适应单载波中高阶累积量调制方式盲检测算法为例，对于载波同步误差引起的频偏问题，提出一种基于频偏稳健的mdpsk信号调制方式盲检测算法；对于未知调制方式信号的定时同步问题，提出一种盲定时估计算法，该算法可以估计mdpsk和mqam信号的定时同步信息，实现数字信号的同步分类；提出了一种基于调制方式盲检测的自适应接收机结构，把调制方式盲检测，信噪比估计和同步解调联合起来进行，实现调制方式随信道质量而自适应变化的信号的正确接收。 - the so-called automatic recognition of modulation ( amr ) schemes automatically classifies the modulation types from the samples of received signal by abstracting the related features such as amplitude, frequency, and phase, followed by employing proper recognition algorithms based on the fast digital signal processing techniques and advanced computing technology . the result of amr can be used in the following processing blocks such as demodulation, supervision processing and anti-interference processing and so on
所谓调制类型自动识别(amr)是根据接收信号样本提取出振幅、频率和相位的特征参数，然后借助信号处理技术和计算机快速处理能力，采用合理算法进行处理，从而实现对未知已调波调制类型的自动识别，为后继的解调、监控、抗干扰等处理奠定基础。 - secondly, comparing with the algorithm that was given by english scholars a . k . nandi and e . e . azzouz in 1995, this dissertation presents a modified automatic recognition algorithm of six kind of digital modulation types such as 2ask, 4ask, 2psk, 4psk, 2fsk and 4fsk, which only uses four key features, and has a very great exaltation in the rate of correct recognition and the performance of signal to noise, we puts forward the constitution of the best threshold which is applicable to the signal that changes within the scope of the signal to noise rate ( snr ) from 5db to 30db, and the overall success rate is not lower than 92 % when snr is over 7db
其次,针对1995年英国学者a.k.nandi和e.e.azzouz提出的针对2ask、4ask、2psk、4psk、2fsk和4fsk这六种常用的数字调制信号识别的算法,提出了一种数字信号调制方式识别算法(dmra)的改进算法。该算法仅利用四个特征参数,就可以识别这六种调制方式,而且在调制识别率和信噪比性能上都有了很大的提高,能够在信噪比不低于7db时,对实际信号的识别正确率高于92%。并且提出了最佳门限的设置方法,设置的门限适用于信噪比在5db~30db范围内变化的信号。 - digital receiver and its forepart operational principle are discussed, then methods of instantaneous autorelation, short-time fourier transform, wigner distribution and wavelet analysis are introduced in detail . the advantages and disadvantages and the application range of these algorithms are given . based on the merits of these algorithms, a new method for signal modulation type analysis is presented
本文讨论了数字接收机以及前端的工作过程，然后详细阐述了瞬时自相关、短时傅立叶变换、wd算法、过零检测和小波分析等各种算法在脉内调制分析上的应用，分析了各算法的优缺点，提出一种并行处理模式：即针对不同的信号采用不同的算法对脉内调制信号进行分析。
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