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提高卫星通信信道传输效率的新途径本 文 结 合 V SAT卫星通信系统设计中涉及卫星通信传输技术极为重要的
信道编码与调制解调方式,探讨了各种新型的卫星信道编码与调制解调技术,
它们的原理及在卫星通信中的应用。在数字调制中,信号传输质量主要取决于
比特差错率BER (Bit Error Rate),因此要尽可能采用相同的每比特信号能量与
噪声功率谱密度比(Eb/N.)的条件下,BER低的调制方式,以节省卫星功率
另外频带利用率要尽可能的高,以节省宝贵的卫星频带。本文还对各种
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给定一个音频范围内的模拟强噪声随机信号(强噪声+周期信号),将信号从强噪声中提取出来,并计算原信号及提取信号的均值、平均功率、方差、频谱及功率谱密度、互相关等 并附带图形-Given within the scope of an audio simulation of strong noise random signal (noise+ periodic signal), the signal from strong noise in the extracted and calculated s
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White noise is a random signal (or process) with a flat power spectral density. In other words, the signal contains equal power within a fixed bandwidth at any center frequency. White noise draws its name from white light in which the power spectral
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针对锁频锁相器( Phase and Frequency Detector, PFD) 应用于低信噪比、大频偏的条件, 通过理论分析和仿真验证阐述了窗口类型对系统频偏捕获速度、范围、噪声门限及相位噪声抖动的影响机理. 推导出等效相位噪声功率谱密度的表达式. 证明了大窗口具有更低的噪声门限和更小的稳态相位抖动, 但捕获速度较慢. 为了提高捕获速度, 对鉴相器输出值取极性运算得到改进的PFD 算法. 新算法不仅能增加鉴相增益提高捕获速度 还可以减少等效噪声功率谱密度降低相位抖动 同时新算法不需要乘法
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本文介绍了OFDM技术及其功率谱的,并通过仿真研究了OFDM的功率谱密度特点。在同样条件下,增大子载波数目,会使信号带宽增加,带外衰减加快,功率谱密度图形更加接近于矩形。另外,添加循环前缀将使离散峰值谱线的值略微增大。-This article describes the OFDM technology and its power spectrum, and to study the characteristics of the power spectral density of the OFD
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随机信号的统计特性测试,均值、方差,相关函数(包括自相关、互相关函数)、频谱及功率谱密度算法.-The statistical properties of random signal test, mean, variance, correlation function (including autocorrelation, cross-correlation function), spectrum and power spectral density algorithms.
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Gaussian noise refers to its obey gaussian probability density function (i.e., normal distribution) of the noise. If a noise, its amplitude distribution obeys the gaussian distribution, and its power spectral density is uniformly distributed, has des
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所谓高斯噪声是指它的概率密度函数服从高斯分布(即正态分布)的一类噪声。如果一个噪声,它的幅度分布服从高斯分布,而它的功率谱密度又是均匀分布的,则称它为高斯白噪声。高斯白噪声的二阶矩不相关,一阶矩为常数,是指先后信号在时间上的相关性。高斯白噪声包括热噪声和散粒噪声。-Gaussian noise refers to its obey gaussian probability density function (i.e., normal distribution) of the noise. If
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所谓高斯噪声是指它的概率密度函数服从高斯分布(即正态分布)的一类噪声。如果一个噪声,它的幅度分布服从高斯分布,而它的功率谱密度又是均匀分布的,则称它为高斯白噪声。高斯白噪声的二阶矩不相关,一阶矩为常数,是指先后信号在时间上的相关性。高斯白噪声包括热噪声和散粒噪声。-Gaussian noise refers to its obey gaussian probability density function (i.e., normal distribution) of the noise. If
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所谓高斯噪声是指它的概率密度函数服从高斯分布(即正态分布)的一类噪声。如果一个噪声,它的幅度分布服从高斯分布,而它的功率谱密度又是均匀分布的,则称它为高斯白噪声。高斯白噪声的二阶矩不相关,一阶矩为常数,是指先后信号在时间上的相关性。高斯白噪声包括热噪声和散粒噪声。
-Gaussian noise refers to its obey gaussian probability density function (i.e., normal distribution) of the noise.
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该程序用于基于认知无线电NC-OFDM系统的仿真,用来计算信号的功率谱密度-The program for the NC-OFDM Cognitive Radio system simulation for calculating the power spectral density of the signal。
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power spectral density of signal codes for communication engineering students to understand the concept of statistical analysis.
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传统源数估计方法要求传感器数大于或等于源数 ,而盲信号很难满足这个条件 ,为此 ,提出了
一种新的源数估计方法。 该方法在传感器数与源数关系不明确的情况下 ,仅根据观测信号的功率谱密
度函数的比值即可对源数作出估计。 通过理论分析、仿真和实验 ,证明了该方法的有效性 。-Traditional source number estimation method for sensor number is greater than or equal to the source, and fana
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psd of eeg signal.power spectral density of eeg.
the eeg data is for the 20 year old person
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Estimate the power spectral density of a signal x with a sample rate Fs -Estimate the power spectral density of a signal x with a sample rate Fs
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粒子图像分割及匹配均为自行编制的子例程,小波包分析提取振动信号中的特征频率,计算目标和海洋回波的功率谱密度。- Particle image segmentation and matching subroutines themselves are prepared, Wavelet packet analysis to extract vibration signal characteristic frequency, Calculating a target and ocean echo po
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计算目标和海洋回波的功率谱密度,对信号进行频谱分析及滤波,包括回归分析和概率统计。- Calculating a target and ocean echo power spectral density, The signal spectral analysis and filtering, Including regression analysis and probability and statistics.
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仿真效果非常好,计算目标和海洋回波的功率谱密度,对信号进行频谱分析及滤波。- Simulation of the effect is very good, Calculating a target and ocean echo power spectral density, The signal spectral analysis and filtering.
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计算目标和海洋回波的功率谱密度,包括调制,解调,信噪比计算,从先验概率中采样,计算权重。- Calculating a target and ocean echo power spectral density, Includes the modulation, demodulation, signal to noise ratio calculation, Sampling a priori probability, calculate the weight.
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插值与拟合的matlab实现,GSM中GMSK调制信号的产生,计算目标和海洋回波的功率谱密度。- Interpolation and fitting matlab implementation, GSM is GMSK modulation signal generation, Calculating a target and ocean echo power spectral density.
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