Research On Light Source Layout And Positioning Of LED Indoor Visible Light Communication

In comparison to traditional lamps,the LED has some advantages,such as miniaturization,low voltage,long life,low energy consumption.The outstanding advantages are high sensitivity,good modulation performance and big transmitting power,so,the white LED can be loaded the modulation signal of communication and realize a new optical communication technology,namely visible light communication(VLC).As a new communication mode combining optical communication and lighting,the LED is more suitable for the signal light source of VLC due to its advantages.Most researches study from the underlying chip,the balance of hardware layer,the modulation and demodulation of software,and seldom study the influence of signal source layout on received signal and indoor positioning accuracy at domestic and abroad.This paper mainly takes the signal light source distribution as the research object,and studies the influence of different distributions on the received performance under the intelligent algorithm.Different distribution schemes are provided to study the influence of LED signal source distribution on the positioning performance of VLC.The main research contents are as follows:1.Based on the signal source distribution characteristics of VLC,the influence of the same receiving angle on the receiving power and optical distribution under different signal source distribution is studied.A new signal light source layout is proposed to improve the signal uniformity of indoor VLC.2.According to the new signal light source layout,appropriate communication link mode is adopted to study the communication performance of indoor visible light system,such as the per unit area of received power(RPUA),signal to noise ratio(SNR),bit error rate.A hybrid particle swarm optimization algorithm based on hybridization is proposed to improve the performance of the system.Finally,the fluctuation value of RPUA and SNR are reduced.The RPUA value fluctuates between-1.5dB/m~2 and-0.5dB/m~2.During the ranges,the receiving area accounts for 93.4%in the target layout,while only 86.7%in the comparison layout.3.For indoor visible light communication,the signal source layout will have a certain impact on its positioning.Then,the calculation of received light power in the receiving system are described in detail.In order to achieve the uniformity of receiving power,the transmitting antenna that meets the conditions is designed,the circuit diagram of each module is designed,the circuit is simulated and tested,and the positioning accuracy of visible light positioning system is improved by using RSS triangulation algorithm,the average positioning accuracy reached 1.44cm,and the test points with an error of less than 0.5cm accounted for 75.6%,so as to achieve the purpose of high precision positioning.