High-Speed Indoor Optical Wireless Links Employing Fast Angle and Power Adaptive Computer-Generated Holograms With Imaging Receivers

Abstract

Index Terms-finite vocabulary of holograms, mobile optical wireless, signal-to-noise ratio, imaging receiver.

Hologram Selection in Realistic Indoor Optical Wireless Systems With Angle Diversity Receivers

“…2. This large number of regions has been selected based on our recent optimization in [17]. In each region, the transmitter uses a hologram that generates the optimum diffusing spots if the receiver is present in any one of the regions.…”

“…A Large number of holograms are required in order to accurately identify the receiver location [17]. Each hologram produces the optimum diffusing spots which were pre-calculated based on the angle and power adaptation algorithm shown in Fig.…”

“…The optimum number of holograms to be stored in the system along with the design complexity has been investigated in more detail in our recent work in [17].…”

“…The holograms are pre-calculated and stored in the proposed system (each is suited for a given (range of) transmitter and receiver locations) and eliminate the need to calculate holograms real time at each transmitter and receiver location. In an initial recent work [17] we have introduced the concept of finite adaptive computer-generated holograms. We optimized the number of holograms to be stored in the system and examined the impact of having a finite hologram vocabulary on SNR and delay spread.…”

“…We optimized the number of holograms to be stored in the system and examined the impact of having a finite hologram vocabulary on SNR and delay spread. Here we extend the work in [17] by (i) introducing a new method of beam delay adaptation in a finite vocabulary of holograms, (ii) employing nine narrow FOVs non-imaging receivers, (iii) considering a realistic indoor environment that experiences shadowing, and (iv) evaluating high data rate systems (2.5 Gb/s and 5 Gb/s).…”