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Title: | Performance improvement of M-QAM OFDM-NOMA visible light communication systems | Authors: | Ren, H Wang, Z Han, S Chen, J Yu, C Xu, C Yu, J |
Issue Date: | 2018 | Source: | In Proceedings of 2018 IEEE Global Communications Conference (GLOBECOM), 09-13 December 2018, Abu Dhabi, United Arab Emirates | Abstract: | Visible light communication (VLC) system is a great candidate for indoor downlink access. Due to the limitation of light-emitting diode (LED)'s bandwidth, orthogonal frequency division multiplexing (OFDM) is used to enhance the transmission capacity of VLC system. Non-orthogonal multiple access (NOMA) can support multiple users in VLC system by sharing time and spectrum resources. The combination of OFDM and NOMA improves the overall channel capacity and spectral efficiency of a multi-user VLC system. In order to increase the data rate further, high order modulation formats are often applied. However, for the superposition of multiple high order modulation signals such as 16-quadrature amplitude modulation (QAM) and 64-QAM, it is hard to recover each user's signal under traditional successive interference cancellation (SIC) method, which is usually used in NOMA scheme. In this paper, we proposed a novel method to decode the superposed signals. This method is called ergodicity and comparison (EAC). By applying the EAC method, the bit error rate (BER) performance of two-user OFDM-NOMA VLC system is investigated under different power allocation conditions. In this system, the modulation formats for both the two users' signals are 4-QAM, 16-QAM and 64-QAM. Peak clipping effect on the received superposed signals is also considered. Numerical results demonstrate that the EAC method can improve significantly the BER performance of OFDM-NOMA VLC system, when high order M-QAM (M > 4) signals are applied to the two users. | Publisher: | Institute of Electrical and Electronics Engineers | ISBN: | 978-1-5386-4727-1 (Electronic) 978-1-5386-4728-8 (Print on Demand(PoD)) |
DOI: | 10.1109/GLOCOM.2018.8648084 | Description: | 2018 IEEE Global Communications Conference (GLOBECOM), 09-13 December 2018, Abu Dhabi, United Arab Emirates | Rights: | ©2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication H. Ren et al., "Performance Improvement of M-QAM OFDM-NOMA Visible Light Communication Systems," 2018 IEEE Global Communications Conference (GLOBECOM), Abu Dhabi, United Arab Emirates, 2018 is available at https://doi.org/10.1109/GLOCOM.2018.8648084. |
Appears in Collections: | Conference Paper |
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Yu_Performance_Improvement_M-Qam.pdf | Pre-Published version | 2.36 MB | Adobe PDF | View/Open |
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