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In this paper, we investigate the performance of the discrete Hartley transform (DHT) hybrid Power Line Communication - Visible Light Communication (PLC-VLC) system based on asymmetrically clipped optical - orthogonal frequency division multiplexing (ACO-OFDM) in impulsive noise, when the Perfect Nulling technique is utilized to analyze the combating of impulsive noise in the system. ACO-OFDM is a multicarrier modulation technique used in communications systems to allow for high data rates while adding robustness to the system. In this work, we derive the theoretical bit error rate (BER) error floor expression which enables us to calculate the error floor introduced into the system due to the nulling of data samples affected by impulsive noise, which we then compare to the simulated BER error floor. Results from this work show that the simulated BER error floor values are approximately the same as the theoretical BER error floor values with insignificant differences. The simulated BER error floor values confirmed the theoretical expression for the BER error floor derived in this work.

Blanking non-linearity is broadly used in impulsive noise communication environments due to its efficiency and ease of deployment to mitigate such noise. During the blanking procedure, data samples with impulsive noise are identified and clipped to zero, which removes impulsive noise from the system thereby, improving the system performance. In this regard, this paper investigates the performance of hybrid power line communication-visible light communication (PLC-VLC) systems with blanking nonlinearity. The signal-to-noise (SNR) ratio at the output of the blanking device is deduced using a closed-form analytical expression. The results show that there is good agreement between simulation results and theory if there is a sufficiently large number of orthogonal frequency division multiplexing (OFDM) sub-carriers. In addition, the study also indicates that the blanking method is more effective in curbing impulsive noise in comparison to the clipping technique. According to the threshold optimisation investigations, there exists a worst-case SINR value that minimizes the output SNR at the OFDM receiver after blanking. Furthermore, the findings also revealed that proper blanking threshold selection is essential for obtaining the best performance. INDEX TERMSPower line communication, visible light communication, orthogonal frequency division multiplexing, DC-biased optical-orthogonal frequency division multiplexing, asymmetrically clipped optical-orthogonal frequency division multiplexing, PLC-VLC systems.