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20 January 2022 Nonlinear trellis-coded precoding for MISO visible light communication system
Zengyi Xu, Wenqing Niu, Nan Chi
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Proceedings Volume 12154, 13th International Photonics and OptoElectronics Meetings (POEM 2021); 1215403 (2022) https://doi.org/10.1117/12.2626472
Event: 13th International Photonics and OptoElectronics Meetings (POEM 2021), 2021, Wuhan, China
Abstract
Multiple-Input-Single-Output (MISO) is a promising application for visible light communication (VLC) system, which is featured in large user capacity, but also suffers from the nonlinearity problem introduced by the light emitting diode (LED) itself and the signal superposition at the receiver. In this article, to suppress the negative effect of nonlinearity in MISO VLC system that utilizes superposition modulation, we proposed a solution that applies Nonlinear Trellis-Coded Precoding (NL-TCP) to shape the spectrum and constellation diagram of the original PAM-4. A PAM-6 signal converted from PAM- 4 by NL-TCP algorithm successfully lowers its BER under the threshold for 7% FEC and supports up to 1.1 Gb/s data rate within severe nonlinearity, while the conventional PAM-4 modulation fails to meet the threshold requirement. The maximum improvement in Q-factor recorded is 1.2dB at the data rate of 1 Gb/s. In comparison, NL-TCP is more sensitive to the data rate, but it has a more desirable robustness against the nonlinearity in the channel. This experiment verifies the practical benefit of NL-TCP in high nonlinearity channel. It is believed that this research is significative for the researchers who are aimed at establishing a usable link, yet have to tolerate the nonlinearity to exist in the channel.
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Zengyi Xu, Wenqing Niu, and Nan Chi "Nonlinear trellis-coded precoding for MISO visible light communication system", Proc. SPIE 12154, 13th International Photonics and OptoElectronics Meetings (POEM 2021), 1215403 (20 January 2022); https://doi.org/10.1117/12.2626472
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KEYWORDS
Telecommunications
Modulation
Receivers
Visible radiation
Complex systems
Signal to noise ratio
Light emitting diodes
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