Dr. Vivek Ashok Bohara Profile

Dr. Vivek Ashok Bohara

at Indraprastha Institute of Information Technology

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Proceedings Article | 1 February 2019 Paper

Power and SER analysis of VLC- and RF-based links in indoor environment

Anand Singh, Dil Nashin Anwar, Anand Srivastava, Vivek Ashok Bohara, G Subrahmanya VRK Rao

Proceedings Volume 10945, 109450R (2019) https://doi.org/10.1117/12.2508695

KEYWORDS: Signal to noise ratio, Modulation, Telecommunications, RF communications, Systems modeling, Receivers, Visible radiation, Phase shift keying, Non-line-of-sight propagation

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The cellular system goes through significant power loss due to indoor channel fading, the height of the building, wall reflections, etc. Visible Light Communication (VLC) in conjunction with the radio frequency (RF) communication can provide potential solutions to address issues wireless network is facing in the indoor environment. VLC uses existing illumination infrastructure for communication. VLC is more secure because light cannot penetrate through the wall, can offer high bandwidth and is environmentally safe green technology, unlike RF. This paper analyses and compares the RF and VLC link for indoor communication with respect to symbol-error-rate (SER) performance and power saving. The RF link path loss inside the building is modeled using WINNER-II path loss model, and VLC channel is modeled including the movement of the people. The same constellation-based modulation schemes are used in both the links for fair comparison such as binary phase shift keying (BPSK) for RF and on-o keying (OOK) for VLC, M^thorder quadrature amplitude modulation (M-QAM) for RF and colour shift keying (M-CSK) for VLC. VLC link provides better SER performance as compared to RF link at the same signal-to-noise-ratio (SNR) for both BPSK (OOK) and 4-QAM (4-CSK) modulation schemes. There is an outstanding amount of power saving using VLC link as compared to RF link inside the room. Further, the SER gap between VLC and RF decreases as the constellation size increases.

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