A novel optical OFDM waveform design for visible light communication system
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Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Gazi Univ, Fac Engineering Architecture
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, a new spread-based optical OFDM waveform is proposed for IM/DD communication systems. The proposed waveform is a combination of the spreading technique and the Flip OFDM waveform. Simulation studies are carried out to evaluate the performance of the proposed s-Flip-OFDM waveform and compare it with optical OFDM waveforms such as Flip OFDM, DCO-OFDM and VLC-OFDM. Figure A. The block diagram of the proposed spread optical OFDM waveform Purpose: The aim of this study is to combine optical OFDM waveforms with the spreading technique previously used in RF systems. The use of the spreading technique in the Flip-OFDM waveform, one of the multi-carrier optical wireless communication schemes, and in other optical OFDM waveforms such as DCO-OFDM and VLC-OFDM is proposed this study for the first time in the literature. Theory and Methods: The transmitter-receiver block diagram of the optical OFDM system using the proposed spreading method is shown in Figure A. In the transmitter side of the optical OFDM system shown in Figure A, randomly generated serial input data is subjected to propagation in the Spreading Block. The spreaded data is then modulated with BPSK modulation in the M-ary Modulator Block. The desired optical OFDM data packets are then generated in the Optical OFDM Modulator Block. In this study, Flip-OFDM waveform, one of the most important optical OFDM waveforms in the literature, is used. The generated flip OFDM data packets are transmitted via LEDs over a multipath fading optical channel and reach to the receiver after being corrupted by additive white Gaussian noise (AWGN). After the distorted signals reaching the receiver are restored with appropriate time domain or frequency domain equalizers, the reverse process is applied at the transmitter to obtain the signals decided at the output of the M-ary De-ModulatorBlock. Finally, the desired performance metrics such as BER and PAPR are calculated using the de-spreading data. Results: When the obtained simulation results are analyzed, from the numerical results, it is observed thatthe spreading technique provides SNR gains in the range of 5 to 10 dB to the performance of optical OFDM waveforms. It is found that the proposed s-Flip-OFDM waveform is approximately 10 dB better than the s-DCO-OFDM waveform and 15 dB better than the s-VLC-OFDM waveform in AWGN channel environment and diffuse multipath optical channel environments. Conclusion: In this article, significant gains were obtained in BER performances in all optical channel environments thanks to the proposed method. The hardware complexity of the proposed waveform is negligible compared to other waveforms. It can be concluded that the proposed s-Flip OFDM waveform may be one of the best waveform schemes for optical wireless communication systems for future 6G and beyond applications
Açıklama
Anahtar Kelimeler
Spreading technique, Optical channel models, Optical OFDM waveform, IM/DD, s-Flip-OFDM waveform
Kaynak
Journal of The Faculty of Engineering and Architecture of Gazi University
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
39
Sayı
3
