The Electromagnetic Radiation Intensity Of WLAN Prediction

With more and more people's urgent needs for wireless networks,wireless local area network(WLAN)has become an indispensable communication tool.At the same time,the electromagnetic radiation generated by WLAN has become a public health problem.Therefore,it is very important to accurately predict WLAN electromagnetic radiation.At present,the main research on electromagnetic radiation of WLAN are mainly focused on measurement.Electromagnetic radiation generated by WLAN is measured by instrument and equipment.The measurement result usually reflects the worst-case situation of electromagnetic radiation.However,the signal is not transmitted continuously in a WLAN,and its average electromagnetic radiation intensity generated by WLAN is often much lower than the maximum radiation value.The World Health Organization often refers the average electromagnetic radiation intensity as a standard.The average electromagnetic radiation intensity of WLAN is related to user arrival rate,user connection time,and signal-to-interference plus noise(SINR).However,there is no published literature to study the theoretical relationship between user arrival rate,user connection time,SINR and WLAN average electromagnetic radiation.The main contents and innovation of this paper are as follows:(1)This paper proposes a user-based WLAN electromagnetic radiation prediction method.This method establishes the mathematical distribution of user arrival rate and user connection time under different scenarios.Using the M/G/? queuing model,the WLAN user arrival number is deduced,and the user session characteristics and binomial distribution are combined to obtain the number of active users in the WLAN coverage area in a period of time.The total duration of active users surfing the Internet during the period of time is calculated through the average WLAN experience time.Then,we could obtain the duty cycle of the WLAN.Finally,using the obtained duty cycle to predict the average electromagnetic radiation generated by WLAN through obtained duty cycle.This paper verifies the accuracy of the model through experiments.For example,in the office area scene,through the analysis of the experimental results,the absolute error percentage of the predicted electromagnetic radiation by this method and measured is 1.09%,which indicates the accuracy of the method for the prediction of the average electromagnetic radiation intensity.(2)This paper presents a method for predicting electromagnetic radiation of the WLAN that are based on SINR.The method establishes a SINR mathematical model.At the same time,in order to obtain the WLAN downlink joint interference power,a random geometric point distribution of the user and the access point is established,and in combination with the transmitted traffic value,the WLAN duty cycle is calculated through the SINR.Finally,the average electromagnetic radiation of the WLAN is predicted through the duty cycle.Through the analysis of experimental results,the deviation rate between the average electromagnetic radiation predicted by SINR and the measured value is 2.3%.Compared with the method proposed by Y Pinto,the deviation rate is reduced by 2.5%,which indicates that the prediction method based on SINR is superior.