Hierarchical scheme for detecting the rotating MIMO transmission of the in-door RGB-LED visible light wireless communications using mobile-phone camera

Shih Hao Chen*, Chi Wai Chow

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Multiple-input and multiple-output (MIMO) scheme can extend the transmission capacity for the light-emitting-diode (LED) based visible light communication (VLC) systems. The MIMO VLC system that uses the mobile-phone camera as the optical receiver (Rx) to receive MIMO signal from the n×n Red-Green-Blue (RGB) LED array is desirable. The key step of decoding this signal is to detect the signal direction. If the LED transmitter (Tx) is rotated, the Rx may not realize the rotation and transmission error can occur. In this work, we propose and demonstrate a novel hierarchical transmission scheme which can reduce the computation complexity of rotation detection in LED array VLC system. We use the n×n RGB LED array as the MIMO Tx. In our study, a novel two dimensional Hadamard coding scheme is proposed. Using the different LED color layers to indicate the rotation, a low complexity rotation detection method can be used for improving the quality of received signal. The detection correction rate is above 95% in the indoor usage distance. Experimental results confirm the feasibility of the proposed scheme.

Original languageEnglish
Pages (from-to)189-193
Number of pages5
JournalOptics Communications
Volume335
DOIs
StatePublished - 15 Jan 2015

Keywords

  • Multiple-input and multiple-output (MIMO)
  • Optical wireless communication (OW)
  • Visible light communication (VLC)

Fingerprint Dive into the research topics of 'Hierarchical scheme for detecting the rotating MIMO transmission of the in-door RGB-LED visible light wireless communications using mobile-phone camera'. Together they form a unique fingerprint.

  • Cite this