Windowing Techniques for Reducing PAPR of OFDM in Li-Fi Systems
| Autor: | Ayad Atiyah Abdulkafi, Ibrahim Khalil Sileh, Saad Mshhain Hardan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010309 optics
020210 optoelectronics & photonics Computer science Orthogonal frequency-division multiplexing 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electronic engineering 02 engineering and technology Electrical and Electronic Engineering Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics |
| Zdroj: | Journal of Optical Communications. 44:111-116 |
| ISSN: | 2191-6322 0173-4911 |
| DOI: | 10.1515/joc-2019-0059 |
| Popis: | In this paper, Li-Fi system based on orthogonal frequency division multiplexing (Li-Fi-OFDM) is presented. In these systems, light-emitting diodes (LEDs) are used to send information data using intensity modulation. LEDs have a limited dynamic range and the voltage-current characteristic shows a nonlinear behavior. Li-Fi-OFDM signal is used to drive these transmitter LEDs. However, LEDs chip overheating and nonlinear distortions occur, due to high peak-to-average power ratio (PAPR) of the OFDM signal. The proposed approach develops a new PAPR reduction method of OFDM in Li-Fi systems based on time-domain windowing techniques. Several windows such as rectangular, Hanning and raised cosine methods have been applied to the OFDM time-domain signal in order to reduce its PAPR while maintain acceptable bit error rate (BER) performance at receiver side. The simulation results of the work have shown the advantages of the offered method; the proposed scheme achieves a significant PAPR reduction compare to the unwindowed signals. Our proposed system also slightly improves the BER performance for all windowing methods employed. |
| Databáze: | OpenAIRE |
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