Complex Signal Mapping for Improving Spectral Efficiency of Li-Fi Systems

• Autorzy: Sileh Ibrahim K. , Abdulkafi Ayad A. , Hussein Mohammed K. , Hardan Saad M.

Identyfikatory

DOI

10.26636/jtit.2019.131719

• Języki publikacji: EN

Abstrakty

EN

Light fidelity (Li-Fi) systems based on the orthogonal frequency division multiplexing (OFDM) scheme have gained more attention in the communications circles, as a means to provide high spectral efficiency and ensure stricter data rate requirements for visible light communication (VLC) systems. However, common OFDM schemes employ Hermitian symmetry to obtain a real-valued signal which is necessary in intensity modulation and direct detection (IM/DD) optical systems, at the expense of doubling the required bandwidth. In this paper, a novel transmission scheme for an OFDM-based Li-Fi system is proposed to tackle the issue in question. A new approach to complex signal mapping (CSM), based on the pairing function method, has been developed for Li-Fi systems. It does not require Hermitian symmetry and, hence, saves about 50% of the required bandwidth. Unlike existing OFDM-based VLC approaches, the proposed scheme employs CSM to ensure a real and positive signal without Hermitian symmetry in order to fully utilize the bandwidth available to Li-Fi networks. Simulation results show that the proposed scheme significantly outperforms other systems in terms of spectral efficiency. The CSM-OFDM based Li-Fi system also achieves a good peak-to-average power ratio (PAPR) reduction with acceptable bit-error-rate (BER) performance, compared to conventional approaches.

Słowa kluczowe

EN

Li-Fi; OFDM; signal mapping; PAPR; BER

• Wydawca: Instytut Łączności - Państwowy Instytut Badawczy
• Czasopismo: Journal of Telecommunications and Information Technology
• Rocznik: 2019
• Tom: nr 3
• Strony: 58--62
• Opis fizyczny: Bibliogr. 10 poz., rys., tab.

Twórcy

autor

Sileh Ibrahim K.

• Electrical Engineering, Tikrit University, Salahaddin, Iraq

autor

Abdulkafi Ayad A.

• Electrical Engineering, Tikrit University, Salahaddin, Iraq

autor

Hussein Mohammed K.

• Electrical Engineering, Tikrit University, Salahaddin, Iraq

autor

Hardan Saad M.

• Electrical Engineering, Tikrit University, Salahaddin, Iraq

Bibliografia

• [1] “Li-Fi market size forecast worth $75.5 billion by 2023” [Online]. Available: https://www.gminsights.com/pressrelease/LiFi-market
• [2] “IEEE 802.15 WPAN Task Group 13 (TG13) Multi-Gigabit/s Optical Wireless Communications” [Online]. Available: http://www.ieee802.org/15/pub/TG13.html
• [3] ”High speed indoor visible light communication transceiver – System architecture, physical layer and data link layer specification”, [811-WP1] Draft new Recommendation ITU-T G.vlc [Online]. Available: https://www.itu.int/md/T13-SG15-160919-TD-WP1-0811/en
• [4] J. Armstrong and A. Lowery, “Power efficient optical OFDM”, Electron. Lett., vol. 42, no. 6, pp. 370–372, 2006 (doi: 10.1049/el:20063636).
• [5] O. Gonzalez, R. Perez-Jimenez, S. Rodriguez, J. Rabadan, and A. Ayala, “Adaptive OFDM system for communications over the indoor wireless optical channel”, IEE Proc. – Optoelec., vol. 153, pp. 139–144, 2006 (doi: 10.1049/ip-opt:20050081).
• [6] Y. Aimer, B. S. Bouazza, S. Bachir, and C. Duvanaud, “Interleaving technique implementation to reduce PAPR of OFDM signal in presence of nonlinear amplification with memory effects”, J. of Telecommun. and Inform. Technol., no. 3, 2018 (doi: 10.26636/jtit.2018.123517).
• [7] A. A. Abdulkafi, M. Y. Alias, and Y. S. Hussein, “A novel approach for PAPR reduction in OFDM-based visible light communications”, in Proc. Int. Conf. on Plat. Technol. and Service PlatCon 2017, Busan, South Korea, 2017, pp. 1–4 (doi: 10.1109/PlatCon.2017.7883678).
• [8] M. Addad and A. Djebbari, “A new code family for QS-CDMA visible light communication systems”, J. of Telecommun. and Inform. Technol., no. 3, 2018 (doi: 10.26636/jtit.2018.124318).
• [9] S. Wolfram, A New Kind of Science. Wolfram Media, 2002 (ISBN13: 9781579550080).
• [10] D. Tsonev, M. S. Islim, and H. Haas, “OFDM-Based visible light communications”, in Optical Wireless Communications. An Emerging Technology, M. Uysal, C. Capsoni, Z. Ghassemlooy, A. Boucouvalas, and E. Udvary, Eds. Springer, 2016, pp. 255–298 (doi: 10.1007/978-3-319-30201-0 12)

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).