Abstract:
본 발명은 건물 내에서 가시광 무선 통신이 가능한 조명의 위치를 측정하고, 조명의 위치 정보를 제공하기 위한 장치 및 방법에 관한 것이다. 이를 위해, 본 발명의 조명 위치 측정 장치는 사용자가 위치한 건물 및 층에 대한 위치 정보를 입력받는 입력부; 사용자의 위치와 건물 내의 벽면들간의 방향별 거리들을 측정하고, 방향별 거리들을 근거로 사용자의 위치 좌표를 계산하는 위치 좌표 계산부; 위치 정보에 대응하는 평면도에 위치 좌표를 적용시켜서, 사용자의 최초 위치를 결정하는 위치 결정부; 및 사용자의 움직임에 따라 조명 식별자를 수신하고, 조명 식별자에 대응하는 조명의 위치 정보를 저장하는 위치 정보 조합부를 포함하는 것을 특징으로 한다.
Abstract:
광이득 제어부 및 전기이득 제어부를 포함하는 가시광 무선통신 방법이 개시된다. 본 발명에 따른 가시광 무선통신 방법은 가시광 무선통신 송신기에서 송신된 신호를 광 조리개를 통과하여 수광 및 광/전 변환부에서 수신하는 단계; 상기 수광 및 광/전 변환부 출력값이 선형구간 임계범위내에 속하는지 판단하여 광이득 제어부에서 상기 수광 및 광/전 변환부 출력값의 광이득을 조절하는 단계; 상기 광이득이 조절된 수광 및 광/전 변환부 출력값을 상기 수광 및 광/전 변환부에서 전기적 신호로 변환하는 단계; 상기 변환된 전기적 신호의 ADC(Analog to Digital Conversion) 입력값이 최적 입력범위 내에 속하는지 판단하여 상기 ADC 입력값이 최적 입력범위에 속하도록 전기이득 제어부에서 상기 ADC 입력 값의 전기이득을 조절하는 단계; 및 상기 전기이득이 조절된 ADC 입력 값을 ADC를 이용하여 디지털 신호로 변환한 후 디지털 수신신호 처리부로 전달하여 신호를 처리하는 단계를 포함한다.
Abstract:
A method and an apparatus for demodulating visible light communication data modulated in a VPPM method are disclosed. According to an embodiment of the present invention, a method for demodulating visible light communication data comprises the steps of: generating sampling signals by receiving and sampling visible light communication signals modulated in a VPPM method; comparing a preset threshold with a first sampling signal among the sampling signals; setting an initial rise flag to a first level when the first sampling signal is larger than the preset threshold and setting the initial rise flag to a second level when the first sampling signal is smaller than the preset threshold; generating an accumulated sample value by accumulating the sampling signals increasing a sample count value; comparing the accumulated sample value with a value in which the threshold is multiplied by the sample count value; making a first bit data into demodulation data, if the initial rise flag is at the second level, when the accumulated sample value is larger than the value in which the threshold is multiplied by the sample count value; and making a second bit data into demodulation data, if the initial rise flag is at the first level, when the accumulated sample value is smaller than the value in which the threshold is multiplied by the sample count value.
Abstract:
The present invention provides an apparatus for communication between vehicles using visible light communication, which includes: a spreading code applying unit which applies a spreading code to transmission data to be transmitted; and a transmitting unit which generates a transmission frame based on the transmission data to which the spreading code is applied and transmits the transmission frame through an illumination lamp of a vehicle. The transmission frame includes a preamble field for synchronizing the transmission frame, a data field for transmitting the transmission data, and a position field for providing hopping information of the transmission data. [Reference numerals] (110) Spreading code applying unit; (120) Transmitting unit; (200) Receiving apparatus
Abstract:
The present invention relates to an apparatus and a method for estimating a moving path using light communication in real time. A server contained in the apparatus for estimating the moving path in real time of the present invention is configured to comprise an agent management unit to set agents and clients; a server communication unit to receive the management information of the agents according to a preset monitoring period; and a path prediction unit to predict a predicted path of the moving path of the clients based on the positional information of the clients tracked through a position determination apparatus having a light communication device and an image capturing device from the agents, which is included in the management information.
Abstract:
Disclosed are a method for estimating a dimming level, a method for processing a visible light signal, and an apparatus using the same. The method for processing the visible light signal according to an aspect of the present invention comprises the steps of: receiving the visible light signal including at least one pulse; estimating a pulse width of the visible light signal; estimating the dimming level of the visible light signal using the estimated pulse width; and demodulating the visible light signal using the estimated dimming level.
Abstract:
Disclosed are a DMX-VLC address processing method using a DMX-512 network and an apparatus using the DMX-512 network. According to the present invention, the DMX-VLC address processing method comprises: a step of receiving a DMX-512 packet; a step of determining whether the DMX-512 packet is included in a light step data using a start code of the DMX-512 packet; a step of processing the light data using an address recorded in the DMX-512 address unit of the DMX-VLC address included in the DMX-512 packet when the DMX-512 packet is included in the light step data; and a step of executing a non-light data process using the address recorded in the DMX-VLC extension address unit of the DMX-VLC address when the DMX-512 packet is not included in the light step data.