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调制类型     
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  modulation types
     An improved BP classifier based on artificial neural networks (ANN) is proposed which, by the use of 7 characteristic parameters, could make correct identification among 11 modulation types, i.e. CW、2FSK、4FSK、8FSK、2PSK、4PSK、8PSK、8QAM、16QAM、4ASK and 8ASK.
     论文提出了一种改进的BP神经网络分类器,它采用7个特征参数,可以对CW、2FSK、4FSK、8FSK、2PSK、4PSK、8PSK、8QAM、16QAM、4ASK、8ASK共11种调制类型实现正确分类识别。
短句来源
     Later on, we adopt a layered neural network classifier to complete the recognition process. The modulation types classified by this recognizer are 2PSK, QPSK, 8PSK, 2FSK, 4FSK, 8FSK, 2ASK, 4ASK and 16QAM.
     随后,本文针对2PSK、QPSK、8PSK、2FSK、4FSK、8FSK、2ASK、4ASK和16QAM等9种调制类型,采用了分层结构的神经网络分类器进行自动识别。
短句来源
     3.Different modulation signals have remarkably different wavelet coefficients features , their optimum scale factors corresponding with modulation types .
     三、不同数字调制信号的小波系数有着不同特征,最佳尺度因子的变化规律反映了通信信号的调制类型,最佳尺度因子的这种特点用来构造了基于小波变换的调制信号分类器。
短句来源
     Simulation experiments showed HHT is a multi-signal processing method; it can accurately describe the change of instantaneous frequency; and can distinct the intra-pulse modulation types clear between various types of radar signals;
     3 将HHT应用于雷达信号处理,提出了基于HHT的雷达信号脉内分析方法,仿真实验表明HHT分析方法具有多信号处理方法,能准确地描述信号的瞬时频率的变化规律,能清晰地区分各类雷达信号的脉内调制类型,并便于对调制参数进行估计。
短句来源
     We indicate a signal modulation recognition method based on pattern recognition theory. It can effectively recognise many modulation types, including AM, ASK, FM, FSK, PSK and so on, on the condition SNR>5db.
     论文中主要介绍了一种基于模式识别理论的信号调制类型识别方法,能够在SNR>5db 的情况下,对AM、ASK、FM、FSK、PSK 等多种调制类型进行有效识别。
短句来源
更多       
  modulation type
     Digital modulation type recognition using neural network based on discrete searching
     基于离散搜索神经网络的数字调制类型识别
短句来源
     To estimate carrier frequency of digitally modulated signal whose modulation type is unknown, a carrier frequency estimation method for digitally modulated signal is proposed.
     针对未知调制类型情况下数字调制信号的载波频率估计问题,提出了一种适用于数字调制信号的载波频率估计方法。
短句来源
     This classifier could effectively distinguish the modulation type of OFDM signals by computer simulation.
     仿真结果表明,该分类器能够有效地识别OFDM信号的调制类型
短句来源
     The paper presents a new method to recognize the modulation type automatically, which combines the wavelet analyzing with the neural network.
     文章提出了小波分析与神经网络相结合的方法自动识别无线电信号的调制类型
短句来源
     Automatic identification of the digital modulation type of a signal has found applications in many areas, including electronic warfare, surveillance and threat analysis.
     信号的数字调制类型识别在电子战、电子侦察和威胁告警等领域有广泛的应用前景。
短句来源
更多       
  modulation mode
     A hierarchical neural network classifier is designed for identifying nine modulation types based on the research on the characteristic set of digital modulation mode recognition.
     研究了数字调制方式识别的特征集,在此基础上针对BPSK、QPSK、8PSK、16QAM、2FSK、4FSK、8FSK、2ASK、4ASK共9种调制类型识别问题,设计了一种分层结构的神经网络分类器。
短句来源
  modulation schemes
     Under nonAWGN channel, aimed at CW, AM, FM, OOK, PSK, QPSK, 16QAM, FSK, MSK, SSB, the methods of characteristic extraction and the algorithm of automatic recognition of modulation schemes has been analyzed, synthesized, designed and simulation.
     在非 AWGN环境下 ,针对 CW,AM,FM,OOK,PSK,QPSK,16 QAM,FSK,MSK,SSB十种混合调制信号 ,对调制类型特征提取方法和自动识别算法进行了分析、综合、设计和计算机仿真。
短句来源
     For 10 common modulation schemes, that is, AM, SSB, FM, CW, OOK, PSK, QPSK, FSK, MSK and 16QAM, the related algorithms are designed and simulated, and the corresponding successful recognition rate and the average recognition time for each algorithm are calculated.
     针对AM、CW、SSB、FM、PSK、QPSK、MSK、FSK、16QAM、OOK十种调制类型,本文分别设计了AWGN信道和非AWGN信道下的调制类型特征提取和自动识别算法,并进行了计算机仿真,统计了正确识别率和自动识别的平均时间。
短句来源
     Feature Abstraction and Automatic Recognition of Modulation Schemes under Interferential Environment
     干扰环境下调制类型特征提取与自动识别
短句来源
     Under multipath channels, concerning with the problem of automatic recognition of modulation schemes, an algorithm of automatic modulation recognition (AMR) based on transform domains has been proposed.
     在多径信道下 ,针对调制类型自动识别 (A MR)问题 ,提出了一种基于变换域的自动识别算法。
短句来源
     Automatic Recognition of Modulation Schemes Based on Transform Domains
     基于变换域的调制类型自动识别
短句来源
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      modulation types
    However, the performance gain varies with different modulation types and channel conditions, and the gain is limited.
          
    An RF-DAC is digitally controlled and thus flexible in altering modulation types.
          
    Care must be taken to assure that equipment interfaced together operates at the same data rates and uses the same modulation types.
          
    Detected features are number of signals, their modulation types, symbol rates and presence of interferers.
          
    For this paper we only consider three different QAM constellations and BPSK as the modulation types of the system.
          
    更多          
      modulation type
    To classify the frequency modulation signal, this paper employs a parameter invariant filter, which can transfer the frequency modulated information to variety of its envelope, and then extracts the histogram feature to classify the modulation type.
          
    Transducer of the magnetic modulation type with a shaped magnet
          
    A Blind Modulation Type Detector for DPRS Standard
          
    The selection index of the G-STBC codeword and the associated modulation type are determined at the receiver and conveyed to the transmitter with a limited feedback overhead to choose an appropriate mode for transmission.
          
    Aggregate capacity and modulation factors versus modulation type and array size.
          
    更多          
      modulation mode
    Atomic force microscopy (AFM) in force modulation mode was adopted to study the cross-section surface of unidirectional CF/PAA composites and the relative stiffness of various phases, including CF, interphase and resin.
          
    Experimental and theoretical studies on the self-modulation mode of generation in a high-power BWT with the electrodynamic system representing a slightly corrugated waveguide are presented.
          
    Experimental observations are in good agreement with the results of simulation predicting a certain simplification of the self-modulation mode at the currents 70-90 A owing to the effect of high-frequency space charge.
          
    SFM in force modulation mode has visualized different interphase thicknesses and gradients of local stiffness.
          
    Furthermore, the biphasic modulation mode is probably due to diverse nucleotide-Fe(II) complexes formed in a concentration-dependent manner.
          
    更多          
      modulation schemes
    A new universal algorithm of modulation and demodulation is presented to process most signals of digital phase-related modulation schemes such as M-DPSK, MSK and even some M-FSK with low modulation level.
          
    It can easily deal with modulation and demodulation of the signals with different modulation schemes and data rates by only setting a few input arguments of the versatile software modules.
          
    It can simply predict the packet performance of the future channel and evaluate the relations between the radio channel and the modulation schemes, error control protocols and channel coding.
          
    In this paper, the feasibility of using different types of time modulation schemes to design low sidelobe time modulated linear arrays is discussed.
          
    The time modulation schemes examined in this study include variable aperture sizes (VAS), unidirectional phase center motion (UPCM), and bidirectional phase center motion (BPCM).
          
    更多          


    The sources of ship-radiated noise rhythms are analysed, the frequent types of rhythms are classified in this paper. The noise modulation envelope is treated as a pulsatory random process with same shape, equal iterative period, random amplitute and structure of group by group in this paper. Various types of modulation envelope power spectra are calculated. The theoretical results are in good agreement with experimental results.

    本文分析了舰船辐射噪声中节奏的物理根源,指出了常见的节奏类型。将噪声调制包络作为有相同形状、相等重复周期、随机幅度,具有成组结构的脉冲性随机过程处理,计算了各种调制类型的功率谱密度,与实验结果比较,得到了很好的一致性。

    On the basis of the previous paper[1], power spectrum density functions for superposition type modulation envelopes and autocorrelation functions for various types of modulation envelopes are calculated in this paper. The theoretical results are in good agreement with experimental results. According to the theoretical analyses and experimental results given in the two papers, it is found that very rich rhythm information is contained in modulation envelope of ship noise. The pieces of information are directly...

    On the basis of the previous paper[1], power spectrum density functions for superposition type modulation envelopes and autocorrelation functions for various types of modulation envelopes are calculated in this paper. The theoretical results are in good agreement with experimental results. According to the theoretical analyses and experimental results given in the two papers, it is found that very rich rhythm information is contained in modulation envelope of ship noise. The pieces of information are directly or indirectly related to physical att ributes of ship itself. The effective extraction of different kinds of rhythm information is very valuable to deducing the work conditions of ship and its own properties from its radiated noise

    在前一篇文章的基础上,本文计算了叠加型调制的功率谱密度以及各种调制类型的自相关函数,与实验结果符合良好。研究结果表明,从舰船辐射噪声调制包络的功率谱密度和自相关函数中可以提取与舰船各种物理属性有关的丰富的节奏信息,同时探讨了提取这些节奏信息的有效方法。

    Twenty three cultivars of Nicotiana tabaccum were used for RAPD analysis with 235 primers to study the genetic diversity among these cultivars. Most of the amplification products were constant for all cultivars, but 46 bands amplified with 16 primers showed intervarietal polymorphism. Intervarietal genetic distances were calculated with these bands and the cultivars were divided into six groups by using UPGMA cluster analysis .It is concluded that the RAPD technique is practical for cultivars identification....

    Twenty three cultivars of Nicotiana tabaccum were used for RAPD analysis with 235 primers to study the genetic diversity among these cultivars. Most of the amplification products were constant for all cultivars, but 46 bands amplified with 16 primers showed intervarietal polymorphism. Intervarietal genetic distances were calculated with these bands and the cultivars were divided into six groups by using UPGMA cluster analysis .It is concluded that the RAPD technique is practical for cultivars identification.

    用235个随机引物对来源于中国、美国等国家的23个烤烟和地方晒晾烟品种基因组DNA进行了RAPD分析。结果表明:25个引物(占10.64%)可以扩增出多态性产物;利用其中16个引物共扩增出128条带,其中46条品种间表现多态性,这种多态性可以进行品种鉴定;根据多态性的带计算了品种间遗传距离,按类平均法可将23个品种划分为6类,各类内包含有不同地理来源和不同调制类型的品种,说明品种地理来源和调制类型差异与遗传差异没有必然的联系。

     
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