Abstract
The potential of using visible light communication (VLC) technologies for vehicular communication networks has recently attracted much attention. The underlying VLC channels, as a foundation for the proper design and optimization of vehicular VLC communication systems, have not yet been sufficiently investigated. Vehicular VLC link impairments can have a significant impact on the system performance and capacity. Such impairments include the optical wireless channel distortion and background noise. This paper proposes a novel three-dimensional (3D) regular-shaped geometry-based stochastic model (RS-GBSM) for vehicular VLC multiple-input single-output (MISO) channels. The proposed 3D RS-GBSM combines a two-sphere model and an elliptic-cylinder model. Both the line-of-sight (LoS) and single-bounced (SB) components are considered. The proposed model jointly considers the azimuth and elevation angles by using von-Mises-Fisher (VMF) distribution. Based on the proposed model, the relationship between the communication range and the received optical power is analyzed and validated by simulations. The impact of the elevation angle in the 3D model on the received optical power is investigated by comparing with the received optical power of the corresponding two-dimensional (2D) model. Furthermore, the background noise is also modeled to evaluate the system's signal-to-noise ratio (SNR).
Highlights
The annual global road crash statistics revealed that road accidents are the direct cause of death for about 1.3 million people every year
In order to introduce the problem of multiple-input single-output (MISO) channel modeling, we assume that the vehicular VLC (VVLC) MISO system consists of left-side headlight (LSH) and right-side headlight (RSH) headlights with transmit powers of PTx−LSH and PTx−RSH, respectively
This figure illustrates the contribution of each headlight in addition to the total received power, which is the sum of the LSH and RSH powers
Summary
The annual global road crash statistics revealed that road accidents are the direct cause of death for about 1.3 million people every year. The main contributions and novelties of the paper are highlighted as follows: 1) A 3D RS-GBSM is proposed for VVLC multiple-input single-output (MISO) channels considering the surrounding moving vehicles and stationary roadside environment. In order to introduce the problem of MISO channel modeling, we assume that the VVLC MISO system consists of LSH and RSH headlights with transmit powers of PTx−LSH and PTx−RSH, respectively. If we assume that both headlights are transmitting the same power, Eq(4) can be rewritten as PRx = PTx H (0)LSH + H (0)RSH In this regards, Eq(5) represents the most general equation for describing the received optical power of the proposed system model
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