COMMUNICATION METHOD AND DEVICE IN OPTICAL CAMERA COMMUNICATION SYSTEM

A method of modulating optical camera communication (OCC) signals by an OCC transmission node in an OCC system comprises the steps of: obtaining binary data signals; grouping the binary data signals by k bits, to convert same into a global phase shift signal having an integer value of M-1(=2k-1); on...

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Hauptverfasser:	HUY, Ngoc Nguyen, NGUYEN, Van Thang, JANG, Yeong Min, PHAM, Tung Lam, THIEU, Minh Duc
Format:	Patent
Sprache:	eng ; fre ; kor
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING CODE CONVERSION IN GENERAL CODING COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS COMPUTING COUNTING DECODING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PHYSICS TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Zusammenfassung:	A method of modulating optical camera communication (OCC) signals by an OCC transmission node in an OCC system comprises the steps of: obtaining binary data signals; grouping the binary data signals by k bits, to convert same into a global phase shift signal having an integer value of M-1(=2k-1); on the basis of a predetermined symbol group mapping table, generating a data signal group by mapping the global phase shift signal onto first to M-th mapping sequences in an nM/2 bit sequence form; modulating the data signal group to generate a pulse signal; and according to the pulse signal, flickering each of a plurality of light sources included in the OCC transmission node. Therefore, the performance of a communication system can be improved. L'invention concerne un procédé de modulation de signaux de communication par caméra optique (OCC) au moyen d'un nœud de transmission OCC dans un système OCC, comprenant les étapes consistant : à obtenir des signaux de données binaires ; à regrouper les signaux de données binaires par k bits, de manière à convertir ces derniers en un signal de déplacement de phase global ayant une valeur entière de M-1(=2k-1) ; en fonction d'une table de mappage de groupes de symboles prédéfinie, à produire un groupe de signaux de données en mappant le signal de déplacement de phase global sur des première à M-ième séquences de mappage dans une forme de séquence de nM/2 bits ; à moduler le groupe de signaux de données de manière à produire un signal à impulsions ; et selon le signal à impulsions, à faire papilloter chaque source de lumière d'une pluralité de sources de lumière comprises dans le nœud de transmission OCC. Par conséquent, les performances d'un système de communication peuvent être améliorées. 광학 카메라 통신(optical camera communication, OCC) 시스템의 OCC 송신 노드에 의한 OCC 신호의 변조 방법은, 이진 데이터 신호를 획득하는 단계, 상기 이진 데이터 신호를 k 비트씩 그룹화하여 0부터 M-1(=2k-1) 까지의 정수 값을 갖는 전역 위상 천이 신호로 변환하는 단계, 미리 설정된 심볼 그룹 매핑 테이블을 기초로, 상기 전역 위상 천이 신호를 n*M/2 비트 시퀀스 형태의 제1 내지 제M 매핑 시퀀스에 매핑하여 데이터 신호 그룹을 생성하는 단계, 상기 데이터 신호 그룹을 변조하여 펄스파 신호를 생성하는 단계 및 상기 펄스파 신호에 따라 상기 OCC 송신 노드에 포함된 복수개의 광원들 각각을 점멸시키는 단계를 포함한다. 따라서 통신 시스템의 성능이 향상될 수 있다.