Transmission device, transmission method, reception device, and reception method

A transmission method implemented in a transmission device, the transmission method comprising:

• generating
• a data symbol by mapping transmission data to a signal point arranged in a two-dimensional or three-dimensional color space,
• a preamble symbol, and
• a control symbol;
• and
• outputting, from an outputter included in the transmission device, an optical signal including the data symbol, the preamble symbol and the control symbol,
• wherein the preamble symbol and the control symbol are represented by luminance information of the optical signal that is identified irrespective of the two-dimensional or three-dimensional color space,
• the preamble symbol enables a reception device to perform signal detection and time synchronization via the luminance information of the optical signal, and
• the control symbol includes information related to the two-dimensional or three-dimensional color space.

A reception device, comprising:

• a light receiver that receives an optical signal including a data symbol, a preamble symbol, and a control symbol via a plurality of light receiving elements;
• and
• a demodulator that generates reception data by demapping and decoding the data symbol, as a signal in a two-dimensional or three-dimensional color space,
• wherein the preamble symbol and the control symbol are represented by luminance information of the optical signal that is identified irrespective of the two-dimensional or three-dimensional color space,
• the preamble symbol enables the reception device to perform signal detection and time synchronization via the luminance information of the optical signal, and
• the control symbol includes information related to the two-dimensional or three-dimensional color space.

A reception method implemented in a reception device, the reception method comprising:

• receiving an optical signal that includes a data symbol, a preamble symbol and a control symbol, the optical signal being received via a plurality of light receiving elements;
• and
• generating reception data by demapping and decoding the data symbol, as a signal in a two-dimensional or three-dimensional color space,
• wherein the preamble symbol and the control symbol are represented by luminance information of the optical signal that is identified irrespective of the two-dimensional or three-dimensional color space,
• the preamble symbol enables the reception device to perform signal detection and time synchronization via the luminance information of the optical signal, and
• the control symbol includes information related to the two-dimensional or three-dimensional color space.