Modulation concepts for high-rate display-camera data transmission

Abstract

Display-camera data links can be regarded as a massive MIMO visible light communication. They are a research topic since several years. Imperceptible data transmission while simultaneously presenting video sequences for human viewers on the display is an innovative approach allowing for many new applications. Several groups work on this concept. This paper describes a new approach with specific modulation schemes and proposes a system, which combines concepts from digital data transmission and real time video processing while carefully taking the characteristics of the human visual system into account. The modulation parameters are selected as a compromise between picture quality deterioration and decoding performance in terms of data rate and bit error probability. Characterizing a video representation by luminance Y and chrominance U and V as usual in electronic media distribution and video source coding, subjective tests show that data modulation of the chrominance signals is a promising option. An early experimental setup applying modulation of U and V video components already provided data rates of 4.5 Mbit/s at acceptable error rates without significant degradation of perceived video quality.