Abstract
Design of an efficient indoor visible light communication (VLC) system requires careful considerations on both illumination and communication aspects. Besides fundamental factors such as received power and signal-to-noise ratio (SNR) level, studies on mobility scenarios and link switching process must be done in order to achieve good communication link quality in such systems. In this paper, a comprehensive lighting configuration for efficient indoor VLC systems for supporting mobility and link switching with constraint on illumination, received power, and SNR is proposed. Full connectivity in mobility scenarios is required to make the system more practical. However, different from other literatures, our work highlights the significance of recognizing the main influences of field of view angle on the connectivity performance in the practical indoor scenarios. A flexible link switching initiation algorithm based on the consideration of relative received power with adaptive hysteresis margin is demonstrated. In this regard, we investigate the effect of the overlap area between two light sources with respect to the point view of the receiver on the link switching performance. The simulation results show that an indoor VLC system with sufficient illumination level and high communication link quality as well as full mobility and support link switching can be achieved using our approach.
Highlights
Radio frequency is facing more difficulty to meet the rapidly growing demand for high data rate wireless transmission and ubiquitous network connectivity in indoor environment due to limited bandwidth and electromagnetic interference
Apart from the illumination level and link quality which is normally determined by signal-to-noise ratio (SNR) and received power level, connectivity and link switching performance are necessary in evaluating an indoor visible light communication (VLC) system
Referring to this algorithm, when the mobile terminal (MT) moves from the coverage area of LED1 to the LED2, in the view overlap area dOA, the link switching process is initiated if the received power of the LED2 exceeds the received power of LED1 at least by hysteresis margin H level which is shown in log where P1 and P2 represent the received power from the LED1 and LED2, respectively
Summary
Radio frequency is facing more difficulty to meet the rapidly growing demand for high data rate wireless transmission and ubiquitous network connectivity in indoor environment due to limited bandwidth and electromagnetic interference. Apart from the illumination level and link quality which is normally determined by SNR and received power level, connectivity and link switching performance are necessary in evaluating an indoor VLC system. Improper position of LEDs as well as too small FOV angle at receivers often introduces blind spots and limits the connectivity performance in indoor VLC system. Link switching in VLC is an important issue as it is understood as the “handover process” in cellular wireless communication It is considered as an indispensable process to maintain and improve the communication link in the scenario of mobility or interference in multi-LED VLC system [11]. We design indoor VLC system by studying the effect of setting lighting positions and setting FOV angle on connectivity and link switching performance as well as illumination and link quality.
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