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Modeling simulation method and system for satellite time-varying channel

A technology of time-varying channel and simulation method, which is applied in the field of modeling and simulation of satellite time-varying channel

Active Publication Date: 2021-02-19
中科南京移动通信与计算创新研究院
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

A single state cannot fully reflect the impact on the satellite channel propagation characteristics when the ground weather state is constantly changing

Method used

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  • Modeling simulation method and system for satellite time-varying channel
  • Modeling simulation method and system for satellite time-varying channel
  • Modeling simulation method and system for satellite time-varying channel

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Embodiment 1

[0149] During the simulation, the operating frequency of the system is selected as 2.2GHz, and the maximum Doppler frequency shift is selected as 300Hz. The operating frequency band and the maximum Doppler frequency shift can be changed according to actual needs. It can better fit the rain attenuation value, here only a certain specific value is selected to generate the simulation result. Generate a low-pass filter that obeys a given Doppler spectrum according to the maximum Doppler frequency shift, and generate a colored Gaussian random process for Gaussian white noise filtering. After generating a colored Gaussian random process, generate a logarithmic Gaussian according to the statistical parameters of shadow fading distribution; the Rayleigh distribution is generated by the synthesis of complex sine waves according to the maximum Doppler shift. Obtain the statistical parameters of the Loo model, the direct component attenuation μ, and the standard deviation of the direct c...

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Abstract

The invention provides a modeling simulation method and system for a satellite time-varying channel. A rain attenuation module and a Loo module are combined to serve as transfer states of markov to simulate a time-varying satellite channel simulation system considering weather state changes. A sunny module and a cloudy module adopt Loo models, and realize the simulation of sunny days and cloudy days by adjusting the receiving power obeying Rayleigh distribution of the Doppler frequency spectrum and the Lognormal distribution obeying the Doppler frequency spectrum according to the specific conditions of the sunny module and the cloudy module. During rain attenuation modeling, statistical parameters of a random process are fitted through long-term rain attenuation data obtained through calculation of an ITU-R model and substituted into the logarithm Gaussian distribution model, so that a time-varying sequence of rain attenuation values is obtained. Because the ITU-R model can calculate the rain attenuation value of the working frequency band below 55Ghz, the system is wide in simulatable frequency range. According to the method, factors such as multipath time delay, Doppler frequencyoffset and shadow fading in the transmission process are considered, and the transmission characteristics of the satellite mobile communication channel in different weather states are accurately described.

Description

technical field [0001] The invention relates to a method and system for modeling and simulating a satellite time-varying channel, and relates to the communication field. Background technique [0002] With the development and progress of science and technology, wireless communication is playing an increasingly important role in the field of contemporary mobile communication, and satellite mobile communication is gradually popularized by virtue of its own advantages. The greater demand for satellite mobile communication makes the requirements for its transmission quality and accuracy of transmission content higher and higher. Since the communication distance between satellites and the ground is usually very long, in order to ensure the quality of communication, it is necessary to be clear about what happens during the communication process. Communication signal fading characteristics to correct the lost signal and reduce the bit error rate. In order to understand and analyze ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/391H04B7/185
CPCH04B17/3911H04B17/3912H04B17/3913H04B7/18532H04B7/1855
Inventor 罗鋆子李民刘垚圻陈宇苏泳涛施渊籍周一青石晶林
Owner 中科南京移动通信与计算创新研究院
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