RoI-based optical wireless communication method and device
AssigneeKookmin University Industry Academy Cooperation Foundation
InventorsYeong Min Jang, Van Trang Nguyen
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Abstract
An optical wireless transmission device according to an embodiment of the present invention comprises: a modulation unit for receiving input of a first input signal and outputting a first output signal; and a light source control unit for controlling a first light source in accordance with the first output signal. The first output signal repeats “0” and “1” in a first phase during clock time if a binary value of the first input signal is 0, and repeats “0” and “1” in a phase opposite from the first phase during the clock time if a binary value of the first input signal is 1.
Claims4
An optical wireless reception apparatus, the optical wireless reception apparatus comprising:
- an image reception unit receiving images obtained by photographing a light source from an image sensor;
- and
- a demodulation unit outputting restored data based on the images,
- wherein a data rate of the restored data is half of a sampling rate of the received images, and the demodulation unit determines the restored data according to following equations:
- yk=XOR(xk;xk-1)
- bm=bm-1+[(y2m-1+y2m)mod 2]
- (Here, xk is a flashing state of the light source in a k-th image, bm is m-th restored data, bm−1 is m−1-th restored data, y2m−1 is 2m−1-th value of yk, and y2m is 2m-th value of yk, and mod is a modulo operator).
An optical wireless reception method, the optical wireless reception method comprising:
- receiving, by an image reception unit, images obtained by photographing a light source from an the image sensor;
- and
- outputting, by a demodulation unit, restored data based on the images,
- wherein a data rate of the restored data is half of a sampling rate of the received images, and the demodulation unit determines the restored data according to following equations:
- yk=XOR(xk;xk-1)
- bm=bm-1+[(y2m-1+y2m)mod 2]
- (Here, xk is a flashing state of the light source in a k-th image, bm is m-th restored data, bm−1 is m−1-th restored data, y2m−1 is 2m−1-th value of yk, and y2m is 2m-th value of yk, and mod is a modulo operator).
Dependencies are inferred from the claim text.