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提取信号七个基于瞬时信息的特征:零中心归一化瞬时幅度功率谱密度的最大值,零中心归一化瞬时幅度绝对值的标准偏差,零中心非弱信号段瞬时相位非线性分量绝对值标准偏差,零中心非弱信号段瞬时相位非线性分量标准偏差,零中心归一化的非弱信号段瞬时频率绝对值的标准偏差,一个信号段的归一化瞬时频率功率谱密度的最大值,根据信号 QPSK 和16QAM在 XI 轴投影的不同表现,提出特征参数。-extract information based on the instan eous features : In the
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周期图法谱估计需要对信号序列“截断”或加窗处理,其结果是使估计功率谱密度为信号序列真实谱和窗谱的卷积,导致误差的产生。本程序分别设计了周期图法,最大熵功率谱估计和Welch法以及它们的对比,最大熵功率谱估计目的是最大限度地保留截断后丢失的“窗口”以外信号的信息,使估计谱的熵最大。-Periodogram spectrum estimation signal sequence needs to " cut off" or add the window handle, the
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matlab下均匀分布自相关函数、正态分布自相关函数、随机信号自相关函数、随机相位信号自相关函数及其分别的功率谱密度图形。-matlab autocorrelation function under the uniform distribution, normal distribution, the autocorrelation function, autocorrelation function of random signals, the autocorrelation function
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模拟数字基带系统在matlab下的实现,包括输入输出信号的码型,功率谱密度,眼图及误码率-Analog-to-digital base-band system in the realization of matlab, including the code input and output signal type, the power spectral density, eye diagram and bit error rate
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his procedure is the power spectral density of the simulation, 3 signal source on the specific circumstances, see the "modern digital signal processing" Introduction to the first volume, P202, Exercise 5. Experimental Methods
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仿真基带数字调制系统实现滚降系数分别为0,0.5,1时信号时域,频域和功率谱密度以及眼图的波形-Simulation-based systems with digital modulation to achieve roll-off coefficients were 0,0.5,1 the signal in time domain, frequency domain and power spectral density and waveform eye diagram
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提取信号七个基于瞬时信息的特征:零中心归一化瞬时幅度功率谱密度的最大值,零中心归一化瞬时幅度绝对值的标准偏差,零中心非弱信号段瞬时相位非线性分量绝对值标准偏差,零中心非弱信号段瞬时相位非线性分量标准偏差,零中心归一化的非弱信号段瞬时频率绝对值的标准偏差,一个信号段的归一化瞬时频率功率谱密度的最大值,根据信号 QPSK 和16QAM在 XI 轴投影的不同表现,提出特征参数。-Extraction based on instantaneous information signal of seven
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提取信号七个基于瞬时信息的特征:零中心归一化瞬时幅度功率谱密度的最大值,零中心归一化瞬时幅度绝对值的标准偏差,零中心非弱信号段瞬时相位非线性分量绝对值标准偏差,零中心非弱信号段瞬时相位非线性分量标准偏差,零中心归一化的非弱信号段瞬时频率绝对值的标准偏差,一个信号段的归一化瞬时频率功率谱密度的最大值,根据信号 QPSK 和16QAM在 XI 轴投影的不同表现,提出特征参数。-Extraction based on instantaneous information signal of seven
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扩频通信,从电磁波利用来看,与一般现有的常规通信方式完全不同。扩频通信利用伪随机编码把信息数据(窄带信号)的频谱进行扩展,形成宽带的低功率谱密度信号发射,使用不同的伪随机序列编码,不同通信用户可在同一频段、同一时间工作,互不影响或干扰极小地进行通信。-Spectrum, from the electromagnetic waves used term, and the general existing conventional means of communication is entirel
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自相关函数Rxx(tao)可以了解不同时刻同一随机样本间的波形相似程度。
自功率谱密度函数Sxx(f):反映相关函数在时域内表达随机信号自身与其他信号在不同时刻的内在联系。当随机信号均值为零时,自相关函数和自功率谱密度函数互为傅立叶变换对。
-Autocorrelation function Rxx (tao) can learn the same random sample at different times the degree of similarity between th
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通信原理中功率谱密度的仿真,仿真了不同占空比,等概、非等概双极性矩形随机信号的归一化功率谱密度,并分析不同信号(不同占空比,等概非等概)所包含的频谱分量,有无直流分量和定时分量信息-Communication theory in the power spectral density of the simulation, the simulation of different duty cycles, such as almost, almost bipolar rectangular Non-r
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应用matlab产生用正弦信号调制的模拟PPM信号,并给出了功率谱密度-Matlab sinusoidal signal generated by application of the analog PPM signal modulation, and gives the power spectral density
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在计算机上产生一组实验数据,首先产生一段零均值白噪声数据u(n),令功率为 ,让u(n)通过一个三阶FIR:
得到y(n). .y(n)上加三个实正弦信号f1’=0.1,f2’=0.25,f3’=0.26调整 和正弦信号幅度信噪比大致为10dB,50dB,50dB. (1) 令N=256,描绘xn波形;
(2)得出真实功率谱密度 .
(3) 利用此实验数据Pisarenko谐波分解法估计该实验数据的正弦频率及幅度。-On the computer to generate a
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方便准确的计算信号的互相关函数和互相关功率谱密度。-To facilitate accurate calculation of the signal cross-correlation function and cross-correlation power spectral density.
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用matlab仿真随机信号的调制解调,并绘制调制信号、已调信号、解调信号、输出信号的频谱、功率谱密度,自相关函数-Matlab simulation of random signals with modulation and demodulation, and draw the modulation signal, modulated signal, the demodulated signal, the output signal spectrum, power spectral densit
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设计切比雪夫1型滤波器,对输入信号进行滤波,并观察功率谱密度-Design of Chebyshev Type 1 filter, filtering the input signal and observe the power spectral density
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周期图法计算在白噪声环境下的正弦信号功率谱密度-Periodogram method under the white noise power spectral density of the sinusoidal signal
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这里是通信领域中各种基带信号(非常全,几乎最新的都有),用matlab编写,给出了相应的带宽和功率谱密度,很值得学习通信的-Here are the various communications baseband signal (very full, almost all the latest), written with matlab, the corresponding bandwidth and power spectral density, it is worth learning to
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了解随机信号自身的特性,包括均值(数学期望)、方差、相关函数、频谱及功率谱密度等。-Understanding of random signal their characteristics, including mean (mathematical expectation), variance, correlation function, spectrum and power spectral density.
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BPSK信号以及BPSK信号扩频后信号的仿真,通过低通滤波器以后,做出其功率谱密度图,查看其信号特性。-BPSK signal and the signal spread spectrum BPSK signal simulation, after low-pass filter through to make its power spectral density maps, see the signal characteristics.
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