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<p>Indoor cellular visible light communication (VLC) is highly recommended for the development of high-capacity, high-speed, secure, and cost-effective wireless optical networks in large indoor environments. This work focuses on cellular VLC systems that use wavelength division multiple access for multi-user communication and ON–OFF keying for light signaling. To achieve uniform illumination in large indoor areas, a large number of light-emitting diodes (LEDs) must be evenly distributed across the room ceiling. However, using access points (APs) with large LED arrays to achieve uniform illumination introduces significant intersymbol interference due to the distributed LEDs transmitting the same signal. Additionally, large-area APs lead to high intercell interference, which arises from wavelength reuse intended to enhance system capacity. The uniformity of illumination is evaluated by calculating the relative standard deviation (RSD) of the illuminance distribution across the area. VLC system performance is evaluated by the average bit-error rate (BER). This work presents a solution that strikes a balance between high VLC system performance and uniform illumination. A satisfactory tradeoff is achieved by determining the optimal radius of the hexagonal LED arrays that form the access points (APs) of the cells, as well as the optimal bit rate. The results show that a uniform illuminance (RSD &lt; 10%) and low bit error rate (average BER &lt; 10<sup>−5</sup>).</p>

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Managing the trade-off between uniform illumination and bit-error-rate in indoor cellular VLC

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Walid M. Fahmi,
  • Asmaa E. Farahat,
  • Khalid F. A. Hussein,
  • Abd-El-Hadi A. Ammar

摘要

Indoor cellular visible light communication (VLC) is highly recommended for the development of high-capacity, high-speed, secure, and cost-effective wireless optical networks in large indoor environments. This work focuses on cellular VLC systems that use wavelength division multiple access for multi-user communication and ON–OFF keying for light signaling. To achieve uniform illumination in large indoor areas, a large number of light-emitting diodes (LEDs) must be evenly distributed across the room ceiling. However, using access points (APs) with large LED arrays to achieve uniform illumination introduces significant intersymbol interference due to the distributed LEDs transmitting the same signal. Additionally, large-area APs lead to high intercell interference, which arises from wavelength reuse intended to enhance system capacity. The uniformity of illumination is evaluated by calculating the relative standard deviation (RSD) of the illuminance distribution across the area. VLC system performance is evaluated by the average bit-error rate (BER). This work presents a solution that strikes a balance between high VLC system performance and uniform illumination. A satisfactory tradeoff is achieved by determining the optimal radius of the hexagonal LED arrays that form the access points (APs) of the cells, as well as the optimal bit rate. The results show that a uniform illuminance (RSD < 10%) and low bit error rate (average BER < 10−5).