Interference Rejection Using Filter-Based Sensor Array in VLC Systems

Design and Intensive Experimental Evaluation of an Enhanced Visible Light Communication System for Automotive Applications

“…In this context, the proposed VLC design brings together in one system performances of state of the art VLC systems. Thus, it provides noise resilience that is comparable with [21,23,33,[54][55][56][57], but longer communication distance than [21,23], better mobility performances [33], and simpler design than [54][55][56][57]; it ensures alike communication distances as [16,21,30,58,59], but improved noise resilience when compared with [16,21,30,58,59] and improved mobility as compared with [16,58,59]. On the downside, in the current configuration the proposed VLC prototype is able to provide 3-50 kb/s data rates.…”

“…Thus, unlike many of the existing VLC prototypes, this one is not tested only in ideal conditions or in circumstances that emphasize a specific ability (i.e., noise resilience, data rate, communication range), but it is also evaluated in a multitude of situations, favorable and unfavorable. Accordingly, when compared to the VLC systems and solutions that are focused on noise mitigation, the one that is presented in this work aims to provide similar resilience to optical noise sources (i.e., up to few thousands of lux), while being able to provide a superior communication range than [21,23], better mobility than [33], and a simpler design than [54][55][56][57]. When compared to the vehicular VLC systems that address tens of meters communication ranges, the proposed prototype aims to provide higher resilience to noise than [16,21,30,58,59], wider FOV and better mobility than [16,58,59], and lower complexity than [60].…”

Interference in multi-user optical wireless communications systems

“…This class consists of the techniques that allow an AP or set of APs to distribute defined resources across a set of users. It is divided into two further categories: [18,73,74] Differential detection (DD) [75] Spatial light modulators (SLM) [67] Orthogonal multiplexing (WDM) [53][54][55] AP placement and configuration [43][44][45][46] Beam control and steering [32,[47][48][49][50][51][52]68] Multiple access techniques (TDMA, OFDMA, CDMA) [19][20][21] Precoding (ZF, MMSE) for MU-MISO NOMA [29][30][31][33][34][35][36][37][38][39][40][41][42] [ [22][23][24][25][26][27][28] MA-SP MA-PHY spatial diversity multiple access -Spatial diversity. This class encompasses both of the PHY and SP cases and is concerned with receiving data by many spatially unique channels or multiple PDs then performing signal processing to have them de-correlated.…”

“…Another MA-PHY technique is proposed by Chang et al [51] involving a low-cost spectrum sensor array at the receiver intended to reject interference on incoming wavelength division multiplexing (WDM) signals. The receiver is also designed to cancel out ambient light interference.…”

Noise Resilient Outdoor Traffic Light Visible Light Communications System Based on Logarithmic Transimpedance Circuit: Experimental Demonstration of a 50 m Reliable Link in Direct Sun Exposure

“…Thus, in the worst-case scenario, when the sun is directly facing the VLC sensor, the irradiance of the incident sunlight can reach a very high level which strongly affects the packet delivery ratio. Although influence of the parasitic light can be reduced using different solutions [2,[18][19][20][21][22], a proportional shot noise component is still introduced in the system. Consequently, in daytime conditions, the background light represents the most important perturbing element for VLC usage in vehicular applications, especially when medium range communications are envisioned.…”