標題: Analysis of Non-Hermitian symmetry (NHS) IFFT/FFT size efficient OFDM for multiple-client non-orthogonal multiple access (NOMA) visible light communication (VLC) system
作者: Adnan, Assaidah
Liu, Yang
Chow, Chi-Wai
Yeh, Chien-Hung
交大名義發表
光電工程學系
National Chiao Tung University
Department of Photonics
關鍵字: Visible light communication (VLC);Optical communications;Light emitting diode (LED);Non-orthogonal multiple access (NOMA)
公開日期: 1-Oct-2020
摘要: Orthogonal-frequency-division-multiplexing (OFDM) format is widely deployed in visible-light-communication (VLC) systems due to its high spectral efficiency. To produce real-valued OFDM signal for VLC, Hermitian-symmetry (HS) is needed during the inverse-fast-Fourier-transform (IFFT) encoding process. However the HS requirement doubles the IFFT/FFT size and increase the encoding complexity. Non-Hermitian symmetry (NHS)-OFDM schemes are proposed, but they have different limitations. In this work, we propose and investigate a non-orthogonal multiple access (NOMA) VLC network serving 2, 3 or 4 clients simultaneously using NHS-OFDM IFFT/FFT size efficient (SE) OFDM format. Numerical analysis of signal amplitude effect to the bit-error-ratio (BER) performance for different users are performed, showing that the BER < 7% forward-error-correction (FEC) limit can be achieved as long as the required signal amplitude ratio of each user is fulfilled. We also compare the proposed system with a typical example of HS-OFDM modulation, i.e. direct-current optical (DCO)-OFDM NOMA-VLC system.
URI: http://dx.doi.org/10.1016/j.optcom.2020.125991
http://hdl.handle.net/11536/155109
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2020.125991
期刊: OPTICS COMMUNICATIONS
Volume: 472
起始頁: 0
結束頁: 0
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