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Wavelet transform based non-hermitian symmetry OFDM technique for indoor MIMO-VLC system with an imaging receiver

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Abstract

Recently, to increase the data capacity of visible light communication (VLC) systems naturally, an ideal combination of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO-OFDM) technique has proven to be an efficient way. However, to ensure real-valued output for the VLC system, a Hermitian symmetry (HS) is usually levied in the OFDM technique, which reduces the data rate while increasing the computational complexity (CC) of the system. In this paper, a wavelet transform (WT) based non-HS OFDM technique (NHS-OFDM) for the MIMO-VLC system has been presented using non-imaging and imaging receivers to study the performance numerically. The state-of-the-art NHS-OFDM technique was realized by isolating real and imaginary parts of traditional RF-based OFDM signal and then transmitted by a pair of white LED luminaries. By incorporating WT with the OFDM technique, the error performance and data rate of the system are greatly improved, as WT eliminates standard usage of the cyclic prefix. Link-level performance of the recommended MIMO-VLC system was tested, considering BER, CC, and PAPR. Also, closed-form analytical BER expressions were derived and compared with the simulated results in the presence of line-of-sight links. Analytical and simulated results are analogous to each other and confirm that the proposed WT-based NHS-OFDM technique with imaging receiver achieves better BER results, with very low CC. Moreover, the WT-based NHS-OFDM technique also reduces the PAPR without employing any reduction technique.

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  1. School of Information, Computer, and Communication Technology, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, 12000, Thailand

    Arslan Khalid

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Khalid, A. Wavelet transform based non-hermitian symmetry OFDM technique for indoor MIMO-VLC system with an imaging receiver. Wireless Netw 27, 4649–4663 (2021). https://doi.org/10.1007/s11276-021-02762-4

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