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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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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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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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psd of eeg signal.power spectral density of eeg.
the eeg data is for the 20 year old person
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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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