VISIBLE LIGHT COMMUNICATION SYSTEM

摘要

A controller is configured, by decreasing light quantity in only a first slot that is any one of a plurality of slots into which a unit time is divided equally, and increasing light quantity in all the remaining slots except the first slot of the plurality of slots, to assign information to the first slot of the plurality of slots. The controller is furthermore configured to decrease light quantity in second slots that are three or more continuous slots starting from a head of a preamble, which indicates a frame start point, of a frame of an optical-communication signal and to increase light quantity in a slot immediately before the preamble.

主权项

1. A visible light communication system comprising a transmitter and a receiver, the visible light communication system being configured to transmit an optical-communication signal from the transmitter to the receiver with visible light as a communication medium,
the transmitter comprising: a light source configured to emit the visible light; a lighting circuit configured to supply electric power to the light source to turn on the light source; and a controller configured to control the lighting circuit to increase/decrease light quantity of the visible light to be emitted by the light source, the controller being configured, by decreasing the light quantity in only a first slot that is any one of a plurality of slots into which a unit time is divided equally, and increasing the light quantity in all remaining slots except the first slot of the plurality of slots, to assign information to the first slot of the plurality of slots, and the controller being furthermore configured to decrease the light quantity in second slots that are three or more continuous slots starting from a head of a preamble, which indicates a frame start point, of a frame of the optical-communication signal and to increase the light quantity in a slot immediately before the preamble.