Patent ID: 8873657

Claim:
A data transmission method, comprising: performing, by a transmitter, scrambling, constellation modulation, and multiple-input multiple-output precoding processing sequentially on downlink user data to obtain a precoded symbol sequence; performing, by the transmitter, time-frequency resource mapping on the precoded symbol sequence to obtain frequency domain data of an orthogonal frequency division multiplexing symbol; performing, by the transmitter, conjugate symmetric extension and inverse fast Fourier transform on the frequency domain data of the orthogonal frequency division multiplexing symbol to obtain a time domain real-number sequence; performing, by the transmitter, cyclic prefix insertion processing on the time domain real-number sequence to form a first downlink time domain baseband signal; loading, by the transmitter, the first downlink time domain baseband signal onto a direct current of a light-emitting diode lighting circuit to form a light-emitting diode driving electrical signal; and converting, by the transmitter, the light-emitting diode driving electrical signal into a visible beam of the light-emitting diode for transmission.