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Method for forecasting line-of-sight transmission probability based on 3D geometrical model

A line-of-sight transmission and geometric model technology, applied in transmission monitoring, transmission systems, radio transmission systems, etc., can solve problems such as high measurement cost, low accuracy, and complex schemes, and achieve great reference value and strong universal applicability and accuracy effects

Active Publication Date: 2017-02-15
深圳无线电检测技术研究院
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Problems solved by technology

However, due to the immaturity of HAP technology, it is difficult to obtain measured data and the cost is high, and the obtained estimation formula is only applicable to the data source area, so it is not practical
[0019] To sum up, the existing HAP line-of-sight transmission probability estimation schemes are either based on too strong assumptions, which are not suitable for the actual environment, and the accuracy is not high, or the schemes are more complicated, the measurement cost is too high, and they are not universal. A new line-of-sight transmission estimation method is imminent

Method used

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  • Method for forecasting line-of-sight transmission probability based on 3D geometrical model
  • Method for forecasting line-of-sight transmission probability based on 3D geometrical model
  • Method for forecasting line-of-sight transmission probability based on 3D geometrical model

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Embodiment

[0057] Such as figure 1 As shown, the line-of-sight transmission probability prediction method based on the 3D geometric model includes the following steps:

[0058] S1, construct a three-dimensional Cartesian coordinate system with the user UE as the origin, and set the parameters as follows;

[0059] direction angle The angle between the projection of the user UE-high-altitude communication platform HAP connection on the x-y plane and the x-axis;

[0060] User antenna elevation angle θ;

[0061] Building density ρ: the average number of buildings per unit area, the unit is building / square kilometer; the typical value of cities, villages and suburbs is 10 3 , 4.95×10 2 , 4.86×10 2 ;

[0062] The width and length of the building are: 2w and 2l;

[0063] Building height h: The building height described here obeys the exponential distribution of parameter λ, namely

[0064] f(h)=λe -λx ;

[0065] The coordinates of the high-altitude communication platform HAP can be e...

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Abstract

The invention discloses a method for forecasting a line-of-sight transmission probability based on a 3D geometrical model. The method comprises the following steps of S1.constructing a three-dimensional Cartesian coordinate system with a user UE as an origin, and setting parameters; S2.determining a scope that a building possibly shelters line-of-sight transmission; S3.determining a building height threshold value when sheltering occurs; and S4.calculating the line-of-sight transmission probability. The method comprehensively considers the influence of various factors, such as surface building distribution, building height distribution, building size, user antenna elevation angle and user antenna horizontal angle, and more precise forecasting of the HAP line-of-sight transmission probability is realized on the premise of low complexity; and the method has larger reference value in determination of a high altitude platform station deployment scheme.

Description

technical field [0001] The present application relates to the technical field of wireless communication, in particular to a method for predicting line-of-sight transmission probability based on a 3D geometric model. Background technique [0002] High-altitude platform technology (HAP), also known as stratospheric platform technology (SPF), can effectively improve wireless communication by deploying airships and hot-air balloon platforms equipped with communication equipment in the stratosphere 17-22km away from the ground to communicate with the ground. Communication network performance. Compared with traditional terrestrial cellular communication, HAP can provide a greater probability of line-of-sight transmission (LoS), greatly reducing the path loss of signal transmission, and the coverage range is as high as hundreds of kilometers, far exceeding the coverage radius of less than 10 kilometers for terrestrial cellular; Compared with satellite communications, HAP signal tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/391H04B7/185
CPCH04B7/18504H04B17/3913H04B7/18541
Inventor 罗群张朝贤许丁杰李晓帆张莎夏斌郭伟斌
Owner 深圳无线电检测技术研究院
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