被调制频谱也很有趣。
主要是数字调制系统、扩展频谱通信原理和直接序列扩频系统等内容。
It mainly contains the digital modulate system, the SS communication theory and the direct sequence spread spectrum (DSSS) system.
说明：这是单边带调制源码，求消息信号和已调信号的频谱。
This is a single sideband modulation source, for the signal and the signal has been modulated spectrum.
这些新技术包括地震波形数字化的过采样技术，数据传输中使用的紧缩频谱调制技术和差错控制技术等。
The new techniques include oversampling technique in digitalization of seismic wave form, spectrum contraction technique in data - transmitting and error-controlling and so on.
通过对调制信号作谱分析，以其频谱中是否存在某种故障的特征频率分量来诊断有无该种故障。
The fault is diagnosed by extracting the fault feature component from the frequency spectrum of the modulated signal.
本文讨论了调幅系数为任意值的调幅波，给出了它的表达式、频谱及调幅系数、调制效率和信噪比增益的计算公式。
The amplitude modulated wave with any modulation factor is discussed in this paper. Its expression, spectrum and formula of the modulation factor, modulation efficiency, SNR gain are given.
FQPS K是针对高频谱效率和高功率效率要求产生的一种调制方式。
FQPSK is a modulation technique that fits for high spectrum efficiency and high power efficiency request.
该方案利用数字混合信号与常用数字调制信号在信号频谱以及星座点的差异提取特征参数进行自动识别。
In the scheme, a set of feature parameters are extracted from signal spectrum and constellation based on the differences between digital mixed signals and common digital modulation signals.
并对频谱线宽、FM调制特性和波长可变特性作了介绍。
The characteristics of spectrum linewidth, FM modulation and variability of wavelength are presented.
推导了非同步型脉冲间隔与宽度双重调制(P I W M)的频谱及其特点。
The frequency spectrum and characteristics of pulse interval and width modulation (PIWM) are derived in detail.
运用MATLAB语言模拟实现了数字信号的ASK、FSK、PSK调制与频谱分析。
The paper uses MATLAB to simulate ASK, FSK, PSK modulation of digital signal and spectrum analysis.
本文在对以往的方法进行分析的基础上，借助于时变谱白化的思想，提出了一种简单、稳定且十分有效的频谱调制方法。
On the basis of analyzing of idea of time varying spectral whitening, the paper presented a simple, stable and very efficient spectrum modulated method.
根据调制解调的频谱转移特性，提出了有效位移噪声是高斯窄带噪声。
According to frequency spectrum transfer characteristic of modulation and demodulation, we think the position measurement noise is Gaussian narrowband noise.
意思就是说一个电子斩波器将负载调制，它会传递能量给频谱的另一部分。
What this means is that an electronic chopper, which translates energy to a different portion of the frequency spectrum, modulates the load.
因而，研究适合于高速数据传输的跳频通信特点且具有高效频谱利用率的调制技术具有重要的实际意义。
Therefore, it has a practical significance to develop some fit methods of modulation with high spectrum efficiency for shortwave FH communication system.
自适应编码调制(amc)技术可以有效地提高无线数据传输的频谱利用率。
Adaptive modulation and coding (AMC) can effectively improve the spectral efficiency for wireless data transmissions.
另一方面，对于MIMO - OFDM系统来说，自适应调制技术可以提高系统的数据传输率、频谱效率以及传输的可靠性。
On the other hand, adaptive modulation technique can enhance data rate, spectrum efficiency and transmission reliability in MIMO-OFDM systems.
下丘神经元的频率及强度选择性受频谱整合作用的调制。
The acoustic responses selectivity of IC neurons to frequency and intensity were modulated by frequency spectral integration.
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.
阐述了SPWM的调制原理与频谱分析。
The modulation principle and spectrum analysis for SPWM were expatiated in detailed.
利用GMSK调制技术提高了频谱利用率和通信质量。
GMSK modulation technology is used to improve spectrum utilization and communication quality.
自适应调制能提高系统的频谱利用率和改善系统的误码率性能。
Adaptive modulation can improve the system performance with high spectral efficiency.
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.
仿真结果表明：四种混沌源调制生成的混沌开关调制信号，均能够降低电源的输入电流及输出电压的频谱峰值。
Simulation results demonstrate: the chaotic modulation signals generated from the four kinds of chaotic sources can all reduce the peak level of the input current and the output voltage spectrums.
调制前由频谱优化器运用最小面积准则（LAC）对正交脉冲的参数进行优化计算并调整，使脉冲频谱符合FCC频谱模板要求。
The orthogonal pulses are adjusted by the optimizer which calculates the parameters based on Least Area Criterion (LAC) before modulation in order to follow the requirements of FCC spectral mask.
为了提高频谱的利用率，各种调制技术在通信系统中被广泛的采用。
For the sake of the utilization of the exaltation frequency, various kinds of modulation technology extensive adoption among communication system.
自适应计算机控制用于减轻在光源和频谱调制过程中固有的非理想特性。
Adaptive computer control is used to mitigate the nonideal features inherent in the optical source and in the spectrum modulation process.
信号经过角度调制后，频谱结构将发生变化，频谱分析是处理信号的重要步骤和必要的保证。
The signal, after the Angle modulation, would change in its spectral structure. And the analysis on its frequency spectrum is an important and necessary step for signal processing.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
现代跳频系统需要传输大量数据信息，传统调制方式由于频谱利用率低而不适合跳频系统的高速数据传输。
Modern FH communication system need transmit a mass of data, traditional modulations are no longer suitable for high-speed data transmitting in FH system due to low spectrum efficiency.
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