Method of transmitting signals in visible light communication and terminal for same
Proposed is a signal transmission method for a transmitting end performing visible light communication. The signal transmission method for a transmitting end performing visible light communication comprises: a step of modulating a signal; and a step of applying analog dimming control on the modulated signal and transmitting same. Meanwhile, the analog dimming control may include biasing of the modulated signal, and scaling of the modulated signal.
1. A method of transmitting a signal by a transmitter performing visible light communication, the method comprising:
modulating a signal; and
transmitting the modulated signal to which analog dimming control is applied,
wherein the analog dimming control includes biasing for the modulated signal and scaling for the modulated signal, and
wherein equal analog dimming control is applied to a reference signal and to a data symbol in a unit time during which channel estimation is performed through the reference signal.
2. The method of claim 1 , wherein the analog dimming control is performed by a voltage amplifier, a voltage-to-current (V-to-I) transducer, and an electrical-to-optical (E-to-O) device of the transmitter.
3. The method of claim 1 ,
wherein application layer input and physical layer input are used as input for the analog dimming control, and
wherein the application layer input includes a dimming level demanded by a system, and the physical layer input includes a maximum power limit value of the transmitter and an inverse fast Fourier transform (IFFT) magnitude used to modulate the signal.
4. The method of claim 1 , wherein a maximum value is applied to scaling for the modulated signal and a minimum value is applied to biasing for the modulated signal.
5. The method of claim 1 , wherein a receiver receiving a signal obtains information related to biasing and scaling for the modulated signal using the reference signal.
6. A transmitter for transmitting a signal through visible light communication, the transmitter comprising:
a transceiver; and
a processor configured to modulate a signal and control the transceiver to transmit the modulated signal to which analog dimming control is applied,
wherein the analog dimming control includes biasing for the modulated signal and scaling for the modulated signal, and
wherein the processor applies equal analog dimming control to a reference signal and to a data symbol in a unit time during which channel estimation is performed through the reference signal.
7. The transmitter of claim 6 , wherein the analog dimming control is performed by a voltage amplifier, a voltage-to-current (V-to-I) transducer, and an electrical-to-optical (E-to-O) device of the transmitter.
8. The transmitter of claim 6 ,
wherein the processor uses application layer input and physical layer input as input for the analog dimming control, and
wherein the application layer input includes a dimming level demanded by a system, and the physical layer input includes a maximum power limit value of the transmitter and an inverse fast Fourier transform (IFFT) magnitude used to modulate the signal.
9. The transmitter of claim 6 , wherein the processor applies a maximum value to scaling for the modulated signal and applies a minimum value to biasing of the modulated signal.
10. The transmitter of claim 6 wherein a receiver receiving a signal obtains information related to biasing and scaling for the modulated signal using the reference signal.