正交相位和幅度调制QPAM ？
4D指四个数据符（2比特），PAM5表示分5个层级的脉冲幅度调制。
The 4D means four data symbols (two bits), the PAM5 is Pulse Amplitude Modulation with five signal levels.
详细论述了多电平PAM（脉冲幅度调制）系统的最佳均衡理论。
The optimum equalization theory for overcoming the intersymbol interferences (ISI) in multi-level pulse amplitude modulation (PAM) systems is establishead.
研究了利用主动电压反馈抑制剩余幅度调制的实际效果和存在问题。
The effects and problems of using active voltage feedback method to suppress the RAM are researched.
本文对几种幅度调制波信号的欠采样频率的选择方法及恢复方法进行了研究。
This paper studies choose method and recover method of non-nyquist sampling on some extent modulate wave signal.
基于DVB_C标准的数字电视系统采用正交幅度调制(QAM)传送信号。
Quadrature Amplitude Modulation (QAM) is used to transfer signals by digital TV system based on DVB_C standard.
提出并实现了采用主动温度反馈控制电光晶体温度对剩余幅度调制变化的抑制。
An active temperature feedback method is proposed and demonstrated to suppress the RAM fluctuation by controlling the EOM temperature.
分析了超宽带冲激无线电的脉位调制、通断键控调制和脉冲幅度调制的信号模型。
The ultra wideband (UWB) radio models have been introduced with pulse-position-modulation (PPM), on-off-keying (OOK) and pulse-amplitude-modulation (PAM).
正交幅度调制(QAM)具有较高的调制效率，被广泛应用于各种数字通信系统中。
QAM (Quadrature Amplitude modulation) has been widely used in various digital communication systems due to its high modulation efficiency.
脉冲幅度调制波（PAM）是脉冲调制的一种形式，在通信和控制系统中得到广泛应用。
Pulse amplitude modulation (PAM) is one form of the ways, in which it is widely used in the system of communication and control.
塔康信标台全向发射脉冲幅度调制信号，隐含空中目标相对于信标台的方位和距离信息。
TACAN beacon transmits pulse amplitude modulation signals in all direction, including bearing and distance information relative to the beacon.
对三波道干涉仪测向结果不受幅度调制和频率调制（相位调制）的影响进行了数学分析。
We also analysed the influence of amplitude modulation and frequency (or phase ) modulation on Interferometer Direction Finder.
我们对注入的连续波激光进行幅度调制并且测量了输入输出光之间调制信号的放大倍数。
We add amplitude modulation onto the CW laser and measure the modulation amplification between seeding and output laser.
幅度调制是用调制信号去控制载波的振幅，使其随调制信号线性变化，而保持载波的频率不变。
Amplitude modulation is to control the amplitude of signal carrier and make it change linearly with modulation signals and maintain its frequency.
相同频率调制比和幅度调制比的情况下，对调制波信号的不同采样点分布可以得到不同的SVM波形。
Under the same amplitude modulation index and same frequency modulation index, different SVM waveforms can be derived from different sampling point distributions.
常用的调制方式使用正弦波作为载波并对其进行幅度调制(AM)和角度调制即调频(FM)或调相(PM)。
In frequently used methods, sine wave is used as carrier with amplitude modulation (am), frequency modulation (FM) and phase modulation (PM) implied.
脉冲位置幅度调制(PPAM)是一种将脉冲位置调制(PPM)和脉冲幅度调制(PAM)结合到一起的新型调制方式。
Pulse position amplitude modulation (PPAM) is a new modulation scheme that combines pulse position modulation (PPM) and pulse amplitude modulation (PAM) together.
对基于ZMNL方法实现杂波仿真，本文简要介绍了相关随机序列产生的一般方法和利用ZMNL实现幅度调制的一般方法。
With reference to clutter simulation based on ZMNL, this paper firstly introduces normal methods of generating relevant stochastic series and amplitude modulation by ZMNL.
文章分析此类信道模型下脉冲位置调制和脉冲幅度调制的性能，结果表明，在频率依赖性信道中PAM调制优于PPM调制。
This paper has analyzed the performance of PPM and PAM under frequency dependence channel model, the results have shown that the PAM is better than the PPM in frequency dependence channel.
从这一点出发，多元正交幅度调制(MQAM)、多载波调制(MCM)及自适应调制技术成为下一代移动无线系统中最有竞争力的几种候选技术。
From this point, M-ary Quadrature Amplitude modulation (MQAM), MultiCarrier modulation (MCM) and adaptive modulation techniques are good candidates in next generation mobile radio system.
在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
通过适当调节两光束的频率调制幅度，可有效地实现克尔效应误差的消除。
Through proper adjustment to frequency modulation amplitude, the Kerr-effect-induced bias can be effectively reduced.
频率依赖于碘压和调制幅度的关系与其他研究所的结果相类似。
The dependence of frequency relations on pressure and modulation amplitude is similar with other laboratories.
得出了啁啾幅度和啁啾相位与调制频率的关系。
Chirping amplitude and phase changes with the modulation frequency are present.
通过验证，所产生的调制信号具有良好的误差向量幅度（EVM）和频谱特征。
The algorithm is verified by experiments and the modulator can produce digital modulation signals with good EVM(Error Vector Magnitude) and spectrum mask.
本文提出了一种新的差分调制方式，我们称之为相干幅度差分相移键控(CADPSK)。
The thesis presents a new differential modulation, Coherent Amplitude and differential Phase Shift Key (CADPSK).
模块中的相位累加器，使系统具有较高的频率分辨率，可实现快速频率切换，很容易实现频率、相位和幅度的数控调制，有广泛的应用价值。
The phase adder in the model is widely applied which could enable system to hold high frequency revolution, fast frequency switching, and easily digital modulating of the signal's phase and amplitude.
连续相位调制由于其具有恒定包络幅度且对任意的调制信息序列能保持信号的相位连续，从而能够有效的改进信号的频谱特性。
The continuous phase modulation has the constant amplitude and its phase is continuous, which make the signal has a very good power spectrum.
首先介绍从信号幅度、相位、频率及功率谱等特性中提取的三种特征参数，应用这三种参数采用人工神经网络对模拟调制信号进行了识别。
Three features parameters derived from the instantaneous amplitude, instantaneous phase, instantaneous frequency and power spectrum of analogue modulated signals are presented in this article.
首先介绍从信号幅度、相位、频率及功率谱等特性中提取的三种特征参数，应用这三种参数采用人工神经网络对模拟调制信号进行了识别。
Three features parameters derived from the instantaneous amplitude, instantaneous phase, instantaneous frequency and power spectrum of analogue modulated signals are presented in this article.
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