The Journal of the Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회논문지)

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Power-efficiency Analysis of the MIMO-VLC System considering Dimming Control

조광제어를 고려한 MIMO-VLC 시스템의 전력 효율 분석

  • 김용원 (대전지역사업평가원) ;
  • 이병진 (충북대학교 전파통신공학과) ;
  • 이병훈 (충북대학교 전파통신공학과) ;
  • 이민정 ((주)에버정보기술) ;
  • 김경석 (충북대학교 전파통신공학과)
  • Received : 2018.08.22
  • Accepted : 2018.12.07
  • Published : 2018.12.31
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Abstract

White light-emitting diodes (LEDs) are more economical than fluorescent lights, and provide high brightness, a high lifetime expectancy, and greater durability. As LEDs are closely connected with people's daily lives, dimming control of LED is an important component in providing energy savings and improving quality of life. In visible light communications systems using these LEDs, multiple input multiple output (MIMO) technology has attracted a lot of attention, in that it can attain the channel capacity in proportion to the number of antennas. This paper analyzes the power performance of three kinds of modulation in visible light communications (VLC) systems applied space-time block code (STBC) techniques. The modulation schemes are return-to-zero on-off keying (RZ-OOK), variable pulse position modulation (VPPM), and overlapping pulse position modulation (OPPM), and dimming control was applied. The power requirements and power consumption were used as metrics to compare the power efficiency in $2{\times}2$ STBC-VLC environments under the three kinds of modulation. We confirm that dimming control affects the communications performance of each modulation scheme. VPPM showed greater consumption among the three modulations, and OPPM showed energy savings comparable to VPPM.

백색 발광다이오드(LEDs)는 형광등보다 경제적이며 높은 밝기, 수명, 내구성을 제공한다. 이러한 LED는 사람들의 일상생활과 밀접하게 연결되어 있기 때문에 LED의 조광제어는 에너지 절약과 삶의 질 향상에 중요한 요소이다. 이 LED를 사용하는 가시광통신시스템에서는 안테나 수에 비례해 채널 용량을 확보할 수 있다는 점에서 복수의 MIMO(입력 다중 출력) 기술이 많은 관심을 끌었다. 본 논문은 가시광통신(VLC) 시스템에서 적용된 공간-시간 블록 코드(STBC) 기법의 세 가지 변조의 전력 성능을 분석한다. 변조 방식은 RZ-OOK(Return-to-On-Ok), 가변 펄스 위치 변조(VPPM), 중첩 펄스 위치 변조(OPPM) 및 조광 제어를 적용하였다. 전력 요구사항과 전력 소비는 세 가지 종류의 변조 하에서 $2{\times}2$ STBC-VLC 환경에서 전력 효율을 비교하는 지표로 사용되었다. 조광 제어가 각 변조 체계의 통신 성능에 영향을 미치는지 확인하였다. 확인 결과 VPPM은 세 가지 변조 중 소비량이 더 많았으며 OPPM은 VPPM에 비해 에너지 절감 효과를 보였다.

Keywords

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Fig. 1. Model of the 2 × 2 STBC-VLC system 그림 1. 2 × 2 STBC-VLC 시스템

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Fig. 2. Example of symbol structures with Dc = 0.8 of modulation schemes 그림 2. 변조 방식들의 Dc = 0.8 일 때 구조 예시

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Fig. 3. SNR performance of a 22 STBC-VLC system 그림 3. 22 STBC-VLC 시스템의 SNR 성능

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Fig. 4. Power requirement of each modulation scheme in a 2ｘ2 STBC-VLC system 그림 4. 2ｘ2 STBC-VLC 시스템 내 변조 방식별 전력 요구량

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Fig. 5. Power consumption vs. SNR when dimming is 30% and 50% 그림 5. 조광이 30%, 50%일 때 전력 소비량 대 SNR

Table 1. Power requirement of each modulation scheme 표 1. 각 변조 방식의 전력 요구량

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Table 2. Power consumption of each modulation scheme 표 2. 각 변조 방식의 전력 소비량

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Table 3. The STBC-VLC environment of simulation 표 3. STBC-VLC 시뮬레이션 환경

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Table 4. Power consumption of each modulation scheme in accordance with dimming 표 4. 조광에 따른 각 변조 방식의 전력 소비량

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