Visible light communication (VLC) has emerged as a promising solution for high-capacity indoor wireless networks by utilizing the unlicensed optical spectrum and existing LED infrastructure; however, efficiently supporting multiple users under limited bandwidth and power constraints remains a key challenge. This paper proposes a code-domain non-orthogonal multiple access (CD-NOMA) framework that jointly exploits resource mapping and adaptive power allocation for multiuser VLC systems, integrated with DC-biased optical OFDM (DCO-OFDM) and evaluated in a realistic indoor environment with multiple LED transmitters and randomly distributed users under heterogeneous channel conditions. Simulation results show that, at 20 dB SNR, the proposed scheme achieves a bit error rate (BER) of 10−4, representing an order-of-magnitude improvement over OMA-TDMA and OMA-FDMA; in addition, it attains a system sum rate of $\mathbf{2 3 0}-\mathbf{2 4 0} \mathbf{~ M b p s}$ $(\mathbf{2 0}-\mathbf{3 0} \%$ gain) and improves edge-user throughput by more than 40%, while maintaining a fairness index above 0.85. These results demonstrate that the proposed CD-NOMA framework significantly enhances reliabil-ity, spectral efficiency, and fairness, making it a strong candidate for next-generation indoor VLC networks.
Dhabita Audrea Belindra, M. R. Perdana, Kusuma Djaka et al.· International Seminar on Int...· 0 citations
The demand for ultra-high-speed and massive connectivity in indoor wireless environments has positioned visible light communication (VLC) as a promising complementary technology for sixth-generation (6G) networks. However, orthogonal frequency division multiple access (OFDMA) and non-orthogonal multiple access (NOMA) still face a practical trade-off between spectral efficiency and user fairness, particularly under light-emitting diode (LED) dynamic-range constraints and imperfect successive interference cancellation (SIC). This paper proposes a channel state information (CSI)-driven adaptive hybrid framework combining orthogonal frequency division multiplexing (OFDM) and NOMA for indoor multiuser VLC systems. The framework selects the transmission mode before rate evaluation through a channel-gain-ratio-based policy, thereby avoiding oracle-based maximum-rate selection. The system model includes line-of-sight (LOS)-dominant propagation, a first-order non-line-of-sight (NLOS) approximation, direct-current-biased optical OFDM (DCO-OFDM) signaling, and residual interference caused by imperfect SIC. MATLAB-based Monte Carlo simulations show that the proposed scheme achieves a sum-rate of 284.67 megabits per second at a signal-to-noise ratio (SNR) of 30 decibels, representing a 38.9 percent gain over conventional NOMA while remaining close to conventional OFDMA. The scheme also attains a Jain’s Fairness Index of 0.9773 at the same SNR and improves weak-user bit error rate (BER) relative to conventional NOMA. Sensitivity analysis indicates stable performance under variations in residual SIC, NOMA power allocation, and switching threshold. These results demonstrate a practical trade-off between throughput and fairness for next-generation indoor VLC deployments.
Natasha Fedora Barus, Aminah Indahsari Marsuki, L. Novamizanti et al.· International Conference on...· 0 citations
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