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• W2891877608 abstract "This work explores the performance of a distinct power saving and relatively simple design visible light communication system based on pulse position modulation (PPM) modulation scheme in a real life (i.e. diffuse) scenario. The mathematical background for both communication and illumination performance is developed for the Sub-Carrier Pulse Position Modulation (SC-LPPM) Scheme in non-line-of-sight (NLOS) environment. An evaluative study is then carried out to provide an integrated picture for the SC-LPPM performance under several system/environmental parameters. Adding the NLOS components increases the total received power, but still, the LOS component dominates. At the corners of a typical room, the received optical power enhances by 120% when including NLOS components, while at room center the optical power enhances only by 12%. For illumination, the NLOS components improve the system’s lighting performance and ensure meeting illumination standards. It provides an extra illumination of about 260 lux at room corner and 175 lux at room center over LOS scenario. Wall reflectivity ( $rho $ ), subcarrier modulation factor (SCMF), and the number of time slots (L) are environmental/system parameters that can significantly optimize the overall performance. For diffuse scenario, a BER of $10^{-5}$ to $10^{-7}$ with $L=4$ , normal wall reflectivity (plaster walls $rho =0.8$ ) and 100% SCMF (i.e. 20 mW/LED) can be achieved easily at bit rates of 1 to 2 Mbps. These BER performance levels can be enhanced by selecting wall painting/ materials with high reflectivity. As a power saving scheme, increasing SCMF with low power/LED level can greatly enhance the BER performance in the diffuse scenario. A remarkable BER performance of $10^{-9}$ can be reached when increasing SCMF by 25% (i.e. to reach 25 mW/LED) under the same conditions ( $L=4$ , $rho =0.8$ and 1–2 Mbps). At higher data rates the performance is getting worse but still can be optimized, controlled, and enhanced through using a careful choice of environmental and system parameters that can be selected from this work." @default.
• W2891877608 created "2018-09-27" @default.
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• W2891877608 date "2018-01-01" @default.
• W2891877608 modified "2023-09-30" @default.
• W2891877608 title "Design and Performance Evaluation for a Non-Line of Sight VLC Dimmable System Based on SC-LPPM" @default.
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• W2891877608 doi "https://doi.org/10.1109/access.2018.2869878" @default.
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