A Light Source Authentication Algorithm Based on the Delay and Sum of the Light Source Emission Sequence

Indoor visible light positioning is susceptible to specular interference, which reduces the accuracy of positioning. From the perspective of increasing the number of identity documents (IDs), this paper proposes a light source authentication algorithm based on the delay and sum of the light source emission sequence. After obtaining the sub-light source emission sequence at the receiving end, the algorithm performs a cross-correlation operation on the adjacent sub-light source emission sequence in chiral order, and the emission sequence delay of the adjacent sub-light source can be obtained. Then, the relationship between the sum of the delays of all emitted sequences and the length of the sequence is calculated to identify the authenticity of the light source array. We conduct a simulation analysis of the light source authentication algorithm based on the delay and sum of the light source emission sequence. The results show that the algorithm can effectively improve the sequence utilization and localization success rate. Compared with the light source authentication algorithm based on the vector product, the number of light source IDs of the proposed algorithm is significantly increased. For example, when the number of light sources is 3 and the sequence length is 63, the number of light source IDs of the proposed algorithm is greater than that of the light source authentication algorithm based on the vector product by about 35. Therefore, the light source authentication algorithm based on the delay and sum of the light source emission sequence can effectively improve the utilization of the sequence.