Combined Envelope Scaling with Modified SLM Method for PAPR Reduction in OFDM-Based VLC Systems

Touhami, Ridha; Slimani, Djamel; Abdulkafi, Ayad Atiyah; Hussein, Yaseein Soubhi; Alias, Mohamad Yusoff

doi:10.1515/joc-2019-0273

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…The transmission to OFDM based system is currently planned and implementation of advanced software equalization techniques is a topic of further research, which will be built upon foundations laid by this article, as a number of foreign teams are focusing on their own OFDM platforms [35][36][37][38][39][40] or even MIMO solutions [41,42]. The 5G-VLC compatibility is the way and the presented platform will continue to evolve past current limitations.…”

Section: Discussionmentioning

confidence: 99%

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Danys¹,

Martínek²,

Jaroš³

et al. 2021

Computers, Materials &Amp; Continua

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This pilot study focuses on a real measurements and enhancements of a software defined radio-based system for vehicle-to everything visible light communication (SDR-V2X-VLC). The presented system is based on a novel adaptive optimization of the feed-forward software defined equalization (FFSDE) methods of the least mean squares (LMS), normalized LMS (NLMS) and QR decomposition-based recursive least squares (QR-RLS) algorithms. Individual parameters of adaptive equalizations are adjusted in real-time to reach the best possible results. Experiments were carried out on a conventional LED Octavia III taillight drafted directly from production line and universal software radio peripherals (USRP) from National Instruments. The transmitting/receiving elements used multistate quadrature amplitude modulation (M-QAM) implemented in LabVIEW programming environment. Experimental results were verified based on bit error ratio (BER), error vector magnitude (EVM) and modulation error ratio (MER). Experimental results of the pilot study unambiguously confirmed the effectiveness of the proposed solution (longer effective communication range, higher immunity to interference, deployment of higher state QAM modulation formats, higher transmission speeds etc.), as the adaptive equalization significantly improved BER, MER and EVM parameters. The best results were achieved using the QR-RLS algorithm. The results measured on deployed QR-RLS algorithm had significantly better Eb/N0 (improved by approx. 20 dB) and BER values (difference by up to two orders of magnitude).

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Section: Discussionmentioning

confidence: 99%

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Danys¹,

Martínek²,

Jaroš³

et al. 2021

Computers, Materials &Amp; Continua

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“…However, when BER performance improved, computational complexity and PAPR grew as well. Ridha Touhami et al [19] developed a methodology followed by a unique envelope scaling mechanism to further lower the OOFDM system's PAPR. In their model, the authors deployed a scaling factor α p that depends directly on the diode characteristics.…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Optical Transmitter Design for Future Generations

Gunturu

Valluri

2022

Preprint

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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.

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Combined Envelope Scaling with Modified SLM Method for PAPR Reduction in OFDM-Based VLC Systems

Cited by 2 publications

References 23 publications

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Low-Complexity Optical Transmitter Design for Future Generations

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