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: | 1-十月-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 |
顯示於類別: | 期刊論文 |