Method of constructing spherical visible light communication modulation constellation diagram

Abstract

The invention provides a method of constructing a spherical visible light communication modulation constellation diagram. By adopting a binary search algorithm A0, initial feasible radiuses (d<^><0>)of M constellation points, which are uniformly distributed on a triangular domain of a spherical surface, are acquired, and positions of three fixed points in the triangular domain of the spherical surface are initialized, and then by using the initial feasible radiuses (d<^><0>), a heuristic quasi-physical algorithm A1 is adopted to acquire a global optimal constellation diagram configuration; according to a rule that a bit symbol average digit difference mapped by two adjacent constellation points is as small as possible, a mapping way corresponding to the constellation diagram distributioncharacteristic design is acquired according to S2. The chromaticity demodulation and the intensity demodulation of the received signals can be carried out by the VLC system at the same time, and the VLC system can be suitable for conventional visible light communication system frameworks. According to the invention, under a condition of maintaining unchanged complexity of conventional CSK demodulators, the transmission reliability of the constellation diagram can be improved greatly.

Description

technical field [0001] The present invention relates to the field of visible light communication, and more specifically, to a method for constructing a spherical visible light communication modulation constellation diagram. Background technique [0002] Visible Light Communication (VLC) technology is a new type of wireless optical communication technology that combines communication and lighting scenarios at the same time. In the context of scarce spectrum resources in the current communication field, considering that Light Emitting Diode (LED) will soon dominate the next generation of indoor lighting, VLC technology can be used as a supplement for wireless access, and its future development trend is mainly At the same time, it ensures the communication and lighting quality of the VLC system, and meets the user's demand for high-speed transmission of indoor wireless networks. [0003] At present, LED lighting modes mainly include two types: fluorescent LED and combination o...

AI Technical Summary

Problems solved by technology

However, in the existing three-dimensional modulation technology in traditional optical fiber communication, its shaping space is represented as a cone in the light intensity domain. Although its envelope range is effectively expanded, its demodulation complexity is also increased, and it will cause lighting in the VLC system The fluctuation depth of the light source is too large

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