Time Frequency Based Two-LED Positioning in Visible Light Communication
The traditional visible light positioning scheme usually requires at least three light sources.In this study,a system model that integrates mirror reflection is proposed,and a time-frequency combination method is utilized to achieve two-LED positioning.The proposed scheme is based on the time-frequency combination method and received signal strength algorithm.It integrates the specular reflection power of one virtual lamp into the effective positioning power of its corresponding real lamp and separates the other virtual lamp as the third light source for positioning.To separate each signal used for positioning at the receiving end,the receiving end detects the frequency domain signal through a filter,detects the pulse signal from the time domain through time division sampling,and separates the real light from its corresponding virtual light through the arrival time of the pulse signal,thereby achieving the two-LED positioning.The simulation results show that the two-LED positioning schemes based on virtual lights can effectively locate a half-room near the mirror surface.Furthermore,the positioning accuracy shows an upward trend as the distance between the receiver and mirror surface decreases.Additionally,the average positioning error can be reduced to within 12.4 cm by further changing the position of the two lights from the mirror surface.
NETL
NSTL
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