A visible light multi-user time division multiplexing multiple access transmission method and system

Abstract

The invention discloses a visible light multi-user time division multiplexing multiple access transmission method and system, comprising: a visible light communication light sends a downlink data signal; user terminals respectively lock the downlink data signal through a phase-locked loop to extract a carrier wave; the visible light communication light goes down Broadcast and send invitation access instructions; user terminals receive invitation access instructions respectively, apply for network access through uplinks through random multiple access, and report their own time-division occupancy coefficients; visible light communication lamps collect network access applications, and determine each The number of downlink carrier cycles of the user terminal is sent through the downlink to the number of downlink carrier cycles of all user terminals; the user terminals respectively receive their own downlink carrier cycle numbers; the visible light communication light sends a start communication command; the user terminal receives the start communication command, and Perform time-division multiplexing communication based on its own downlink carrier cycle number. The invention realizes the synchronous seamless switching between multiple user terminals, and effectively improves the transmission efficiency.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, in particular to a visible light multi-user time division multiplexing multiple access transmission method and system. Background technique [0002] Visible light communication technology has outstanding advantages such as green, high efficiency, and ubiquitous, and is very suitable for indoor communication. A typical visible light indoor communication scenario includes multiple visible light communication lights as wireless connection points, and each light irradiation area contains multiple mobile visible light user terminals. Each visible light communication light and the user terminals in its irradiation area constitute a two-way one-to-many system. A common implementation method is: the downlink sends a communication light signal in the form of broadcast by a visible light communication light, and the user terminal receives the same signal and extracts the inform...

AI Technical Summary

Problems solved by technology

[0003] For this reason, the user terminal must first send pilot information after turning on the sending light. It is estimated that the useful data can only be sent after the upper loop of the visible light communication light is locked. A large guard interval needs to be left, resulting in low transmission efficiency.

If the guard interval is too small, it will cause packet loss

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