Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks

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Md. Jahid Hasan
Oussama Haddad
Ikenna Chinazaekpere Ijeh
Md. Abdur Rahman


The transfer of data from multiple internet of things (IoT) devices requires the use of a robust and efficient multiple access (MA) solution. This paper considers the orthogonal frequency division MA (OFDMA) technique for the light-fidelity (LiFi)-based IoT uplink using infrared to transmit data from multiple mobile users to a fixed access point. The conventional schemes based on orthogonal frequency allocate distinct subcarriers to each user sharing the same time slot. We consider a new approach by allocating distinct time slots to a group of OFDMA users. Taking into account realistic opto-electronic components, we study the performance of the conventional and proposed optical-OFDMA schemes. We show that asymmetrically clipped optical-OFDMA signaling scheme outperforms direct current biased signaling in terms of electrical power efficiency. Focusing on the asymmetrically clipped signaling, We demonstrate the robustness of our proposed time multiplexed optical-OFDMA scheme against MA interference caused by signal clipping. We also show the advantages of our scheme in reducing computational complexity by a factor of 2 compared to the conventional optical-OFDMA schemes.


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How to Cite
M. J. Hasan, O. Haddad, I. C. Ijeh, and M. A. Rahman, “Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks”, AJSE, vol. 22, no. 2, pp. 164 - 173, Aug. 2023.