A new complexity reduction scheme in selective mapping‐based visible light communication direct current‐biased optical orthogonal frequency division multiplexing systems

Abstract

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.

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

“…To generate many uncorrelated alternative signals, authors in [32,33] used a lowcomplexity SLM technique based on a conversion matrix. The conversion matrix is generated by a circular shift of a periodic phase vector.…”

PAPR reduction using SLM technique combined with ABO-OFDM for optical wireless communication

“…The SI in PTS can reach a very high number 17 . Among these methods, SLM has been till date one of the most preferred techniques because of its simple and easy implementation and effective PAPR reduction performance 10,19,20 .…”

Adaptive-Mode PAPR Reduction Algorithm for Optical OFDM Systems Leveraging Lexicographical Permutations

“…As a consequence, a pronounced peak-to-average power ratio (PAPR) is commonly observed. This issue of high PAPR poses a formidable challenge in optical OFDM systems, which unfortunately has yet to be effectively addressed or resolved [9][10][11][12][13]. The challenge of high PAPR poses a formidable obstacle when it comes to preserving the integrity of the complete signal within the linear operating range of crucial transmitter elements.…”