CN109738710B - Base station indoor electromagnetic radiation estimation method based on path loss - Google Patents
Base station indoor electromagnetic radiation estimation method based on path loss Download PDFInfo
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Abstract
The invention discloses a base station indoor electromagnetic radiation estimation method based on path loss, which considers the influence of the path loss on the indoor electromagnetic radiation of a base station, calculates the outdoor path loss of a base station signal through the height of a base station transmitting antenna, the height of a floor where a user is located and the horizontal distance between the base station and a building where the user is located, calculates the power of the base station signal after penetrating through the wall of the building by combining the wall penetration loss, and calculates the electromagnetic radiation intensity received by the user according to the indoor path loss and the distance between the user and the wall of the building. The method can quickly and accurately evaluate the indoor electromagnetic radiation intensity of the base station, has a great reference value for researching the electromagnetic radiation exposure condition of the base station, and has certain social benefits.
Description
Technical Field
The invention relates to a base station indoor electromagnetic radiation estimation method based on path loss.
Background
With the development of mobile communication technology, the influence of electromagnetic radiation generated by communication base stations on the environment and public health is receiving wide attention from society. Currently, the evaluation of the electromagnetic radiation intensity of a base station is usually performed by using a special measuring instrument such as a spectrum analyzer. However, these measuring instruments are generally expensive, and only researchers in colleges and universities have the condition for evaluating the electromagnetic radiation intensity of the base station.
Aiming at the defects of the prior art, the invention provides a base station indoor electromagnetic radiation estimation method based on path loss. The method considers the influence of path loss on indoor electromagnetic radiation of the base station, calculates the outdoor path loss of a base station signal through the height of a transmitting antenna of the base station, the height of a floor where a user is located and the horizontal distance between the base station and a building where the user is located, calculates the power of the base station signal after penetrating through the wall of the building by combining the wall penetration loss, and then calculates the electromagnetic radiation intensity received by the user according to the indoor path loss and the distance between the user and the wall of the building. Experiments show that the method provided by the invention can get rid of the limitation of a special measuring instrument and accurately estimate the indoor electromagnetic radiation intensity of the base station.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method for estimating indoor electromagnetic radiation of a base station based on path loss, comprising the following steps:
1) calculating the outdoor path loss of the base station signal according to the height of the transmitting antenna of the base station, the height of the floor where the user is located and the horizontal distance between the base station and the building where the user is located;
2) calculating the power of the base station signal after penetrating through the building wall according to the wall penetration loss and the outdoor path loss obtained in the step 1);
3) and calculating the electromagnetic radiation intensity received by the user according to the indoor path loss, the distance between the user and the building wall and the power of the base station signal obtained in the step 2) after the base station signal penetrates through the building wall.
In the aforementioned method for estimating indoor electromagnetic radiation of a base station based on path loss, in step 1), the outdoor path loss of a base station signal is:
in the above formula, LoutRepresents the outdoor path loss of the base station signal in dB, hbsRepresenting the height of the transmitting antenna of the base station in meters, hufThe floor height of the user is expressed in meters, and l represents the horizontal distance between the base station and the building in which the user is located in meters.
In the aforementioned method for estimating indoor electromagnetic radiation of a base station based on path loss, in step 2), the power of a base station signal after penetrating through a building wall is:
in the above formula, PinRepresents the power of the base station signal after penetrating the wall of the building, and has the unit of W and PtDenotes the base station transmission power in W, G denotes the base station transmit antenna gain in dB, LoutRepresents the outdoor path loss of the base station signal in dB, LtwRepresenting the wall penetration loss, has a value of 20 in dB.
In the aforementioned method for estimating indoor electromagnetic radiation of base station based on path loss, in step 3), the intensity of electromagnetic radiation received by the user is:
in the above formula, E represents the intensity of the electromagnetic radiation received by the user, and the unit is V/m, PinRepresents the power of the base station signal after penetrating the wall of the building, and has the unit of W and dinRepresenting the distance between the user and the building wall in meters, LinRepresenting indoor path loss, expressed asComprises the following steps: l isin＝0.5·dinIn dB.
The invention has the beneficial effects that: the influence of the path loss on the indoor electromagnetic radiation of the base station is considered, the outdoor path loss of the base station signal is calculated through the height of the transmitting antenna of the base station, the height of the floor where the user is located and the horizontal distance between the base station and the building where the user is located, the power of the base station signal after penetrating through the building wall is calculated by combining the wall penetration loss, and the electromagnetic radiation intensity received by the user is calculated according to the indoor path loss and the distance between the user and the building wall. The method can get rid of the limitation of a special measuring instrument, quickly and accurately estimate the indoor electromagnetic radiation intensity of the base station, has a great reference value for researching the electromagnetic radiation exposure condition of the base station, and has certain social benefits.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. The present embodiment is performed on the premise of the present disclosure, and detailed implementation procedures are given, but the scope of the present disclosure is not limited to the following embodiments.
In the embodiment, the electromagnetic radiation intensity of the FDD-LTE base station in the interior of a fifth building of an experimental building in a university campus is estimated, and experimental measurement equipment for verifying the estimation result is a portable spectrum analyzer Keysight FieldFox N9918A and a periodic logarithmic antenna HyperLOG 60180.
The invention provides a base station indoor electromagnetic radiation estimation method based on path loss, which comprises the following steps:
1) calculating the outdoor path loss of the base station signal according to the height of the transmitting antenna of the base station, the height of the floor where the user is located and the horizontal distance between the base station and the building where the user is located;
2) calculating the power of the base station signal after penetrating through the building wall according to the wall penetration loss and the outdoor path loss obtained in the step 1);
3) and calculating the electromagnetic radiation intensity received by the user according to the indoor path loss, the distance between the user and the building wall and the power of the base station signal obtained in the step 2) after the base station signal penetrates through the building wall.
Said step (c) is1) In, base station transmitting antenna height hbs51 meters, the height h of the floor where the user is locateduf13.5 meters, the horizontal distance l between the base station and the building where the user is located is 31 meters, and the outdoor path loss of the base station signal is:
in the step 2), the base station transmits power Pt20W, the gain G of the base station transmitting antenna is 16dB, and the wall penetration loss LtwThe power of the base station signal after penetrating through the wall of the building is 20 dB:
in the step 3), the distance d between the user and the building wallin2 m, indoor path loss LinThe intensity of the electromagnetic radiation received by the user is 1dB for 0.5 · 2:
in the embodiment, the electromagnetic radiation intensity of the FDD-LTE base station in the fifth floor of the experimental building is measured by using the spectrum analyzer, the measured value is 0.0117V/m, and the measured value is basically consistent with the estimated value of the method used by the invention, so that the method can be used for quickly and accurately estimating the indoor electromagnetic radiation intensity of the base station, and the effectiveness of the method used by the invention is verified.
Claims (1)
1. A base station indoor electromagnetic radiation estimation method based on path loss is characterized by comprising the following steps:
1) calculating the outdoor path loss of the base station signal according to the height of the transmitting antenna of the base station, the height of the floor where the user is located and the horizontal distance between the base station and the building where the user is located:
in the above formula, LoutRepresents the outdoor path loss of the base station signal in dB, hbsRepresenting the height of the transmitting antenna of the base station in meters, hufThe height of the floor where the user is located is expressed in meters, and l represents the horizontal distance between the base station and the building where the user is located and is expressed in meters;
2) calculating the power of the base station signal after penetrating through the building wall according to the wall penetration loss and the outdoor path loss obtained in the step 1):
in the above formula, PinRepresents the power of the base station signal after penetrating the wall of the building, and has the unit of W and PtDenotes the base station transmission power in W, G denotes the base station transmit antenna gain in dB, LoutRepresents the outdoor path loss of the base station signal in dB, LtwRepresents the wall penetration loss, with a value of 20 in dB;
3) calculating the electromagnetic radiation intensity received by the user according to the indoor path loss, the distance between the user and the building wall and the power of the base station signal obtained in the step 2) after penetrating through the building wall:
in the above formula, E represents the intensity of the electromagnetic radiation received by the user, and the unit is V/m, PinRepresents the power of the base station signal after penetrating the wall of the building, and has the unit of W and dinRepresenting the distance between the user and the building wall in meters, LinRepresents the indoor path loss and has the expression: l isin＝0.5·dinIn dB.
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| CN110995380B (en) * | 2019-12-18 | 2022-07-01 | 湘潭大学 | Indoor base station electromagnetic radiation prediction method |
| CN110932804B (en) * | 2019-12-19 | 2024-04-05 | 湘潭大学 | Base station average electromagnetic radiation prediction method |
| CN111010248B (en) * | 2019-12-23 | 2022-02-11 | 湘潭大学 | Base station electromagnetic radiation prediction method based on building |
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| JP2008219077A (en) * | 2007-02-28 | 2008-09-18 | Nippon Telegr & Teleph Corp <Ntt> | Station installation design method device in radio communication system |
| CN102546046B (en) * | 2010-12-29 | 2014-05-14 | 中国联合网络通信集团有限公司 | Method and device for predicting interference of outdoor wireless network to indoor wireless network |
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