Two Types of Mixed Orthogonal Frequency Division Multiplexing (X-OFDM) Waveforms for Optical Wireless Communication
| Autor: | Yibo Lyu, Junping Zhang, Jiajin Luo, Xu Li, Jingjing Huang, Rui Ni |
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| Rok vydání: | 2022 |
| Předmět: |
Signal Processing (eess.SP)
Computer science Orthogonal frequency-division multiplexing Applied Mathematics FOS: Electrical engineering electronic engineering information engineering Electronic engineering Optical wireless Waveform Systems and Control (eess.SY) Electrical Engineering and Systems Science - Signal Processing Electrical and Electronic Engineering Electrical Engineering and Systems Science - Systems and Control Computer Science Applications |
| Zdroj: | IEEE Transactions on Wireless Communications. 21:1092-1102 |
| ISSN: | 1558-2248 1536-1276 |
| Popis: | The optical wireless communication (OWC) with the intensity modulation (IM), requires the modulated radio frequency (RF) signal to be real and non-negative. To satisfy the requirements, this paper proposes two types of mixed orthogonal frequency division multiplexing (X-OFDM) waveform. The Hermitian symmetry (HS) character of the sub-carriers in the frequency domain, guarantees the signal in the time domain to be real, which reduces the spectral efficiency to $1/2$. For the odd sub-carriers in the frequency domain, the signal in the time domain after the inverse fast fourier transform (IFFT) is antisymmetric. For the even sub-carriers in the frequency domain, the signal in the time domain after the IFFT is symmetric. Based on the antisymmetric and symmetric characters, the two types of X-OFDM waveform are designed to guarantee the signal in the time domain to be non-negative, where the direct current (DC) bias is not needed. With $N$ sub-carriers in the frequency domain, the generated signal in the time domain has $3N/2$ points, which further reduces the spectral efficiency to $1/3 = 1/2 \times 2/3$. The numerical simulations show that, the two types of X-OFDM waveform greatly enhance the power efficiency considering the OWC channel with the signal-dependent noise and/or the signal-independent noise. Comment: X. Li, J. Huang, Y. Lyu, J. Luo, J. Zhang, "A Mixed Orthogonal Frequency Division Multiplexing (X-OFDM) Waveform for Optical Wireless Communication," \emph{Accepted by 2020 IEEE GLOBECOM Workshop on Optical Wireless Communications (OWC)}, 2020 |
| Databáze: | OpenAIRE |
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