Visible light communication (VLC) has emerged as a good accompaniment to radio‐frequency (RF) technologies by deploying multicarrier schemes such as orthogonal frequency division multiplexing (OFDM). However, the coherent summation of carriers in the OFDM system leads to a high peak‐to‐average‐power ratio (PAPR), causing non‐linear clipping distortion at the transmitting light‐emitting diode. This intricacy becomes a potential barrier for intensity modulation and limits the VLC systems' bandwidth. In the literature, non‐distorting PAPR lowering approaches, such as the selective mapping (SLM) approach, have been confirmed as the most effective strategy for reducing ineludible high PAPR in optical OFDM systems among all other available techniques. Besides its astounding performance, the computational complexity also becomes a major complication in SLM due to the generation of multiple candidates. This paper proposes a computational complexity minimisation approach using inherit system properties in the SLM‐based PAPR suppression method for VLC systems, where the phase sequence vectors are considered periodic. The alternative direct current‐biased optical orthogonal frequency division multiplexing candidates for the single frequency‐domain data block are generated with the periodic phase rotation vector. The evaluation of the complexity analysis and the simulation results shows that the mitigation of computational complexity surpasses the standard SLM technique.

The burgeoning field of visible light communication (VLC) technology is seen as a possible complement to incumbent radio frequency (RF) systems, as it uses optical orthogonal frequency division multiplexing (OOFDM) to attain faster data rates to comply with 5G standards. Despite its benefits, the multicarrier structure of OOFDM acquires constructive additions at certain subcarrier intervals during the inverse fast Fourier transform (IFFT) operation, leading to increased peak values. Non-distorting peak-to-average power ratio (PAPR) reduction procedures, like as selective mapping (SLM), were confirmed to be the most effective method for lowering ineluctably severe PAPR amongst the other methods. The advent of numerous alternative candidates enhances computational complexity, thus form a major obstacle in SLM. To convert an input direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) symbol into a series of candidates, the proposed SLM technique’s phase vectors are multiplied at a specific intermediate stage of IFFT. In top to this complexity reduction, the first stage IFFT output provides further reduction according to its conjugate symmetry property. The DCOOFDM signal, that has the smallest PAPR of all alternatives, is chosen for transmissions. According to the complexity analysis and simulation results, the computational complexity abatement strategy surpasses the conventional SLM (CSLM) technique that allows us to incorporate this technology into any future generation VLC systems.

The generalized frequency division multiplexing (GFDM) system has attracted the interest of the research community due to its unique characteristics such as high spectrum efficiency, low latency, and high transmission rate. However, like every multicarrier technique superimposition of a number of subsymbols in the time domain results in a high peak-to-average power ratio (PAPR). In general, the PAPR reduction system in the literature increases the average power while decreasing the PAPR which is not a plausible solution for practical 5G applications. In order to address this issue, we propose an efficient PAPR reduction strategy that maintains the PAPR without increasing the average power. In this method, an optimal orthogonal precoding matrix based on singular value decomposition (SVD) is designed to reduce the system's average power. Because this optimal precoding matrix cannot successfully reduce the PAPR, we introduce a second technique called peak samples affixing to minimize both the peak and average power. For the proposed method's assessment, using LabVIEW software and the universal software radio peripheral 2953R (USRP) as hardware, we developed an experimental setup to enable real-time transmission. The received spectral response from USRP authenticated the proposed method by showing a good agreement with simulations.

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