[1] N. Chi, Y. Zhou, Y. Wei, F. Hu. Visible light communication in 6G: advances, challenges, and prospects. IEEE Veh. Technol. Mag., 15, 93(2020).
[2] W. Jiang, B. Han, M. A. Habibi, H. D. Schotten. The road towards 6G: a comprehensive survey. IEEE Open J. Commun. Soc., 2, 334(2021).
[3] S. Chen, J. Zhang, Y. Jin, B. Ai. Wireless powered IoE for 6G: massive access meets scalable cell-free massive MIMO. China Commun., 17, 92(2020).
[4] Y. L. Lee, D. Qin, L. C. Wang, G. H. Sim. 6G massive radio access networks: key applications, requirements and challenges. IEEE Open J. Veh. Technol., 2, 54(2021).
[5] C. Chen, W. Zhong, H. Yang, P. Du. On the performance of MIMO-NOMA-based visible light communication systems. IEEE Photonics Technol. Lett., 30, 307(2018).
[6] W. Wang, Y. Zhu, Y. Zhang, J. Zhang. An optimal power allocation for multi-LED phase-shifted-based MISO VLC systems. IEEE Photonics Technol. Lett., 27, 2391(2015).
[7] H. Ji, S. Qiao, T. Zhang. A MISO-VLC system based on LACO-OFDM and superposed constellation demodulation. 9th International Conference on Information Science and Technology, 294(2019).
[8] L. Qiao, X. Lu, S. Liang, J. Zhang, N. Chi. MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding. Chin. Opt. Lett., 16, 060604(2018).
[9] C. Wang, G. Li, F. Hu, Y. Zhao, J. Jia, P. Zou, Q. Lu, J. Chen, Z. Li, N. Chi. Visible light communication for vehicle to everything beyond 1 Gb/s based on an LED car headlight and a 2 × 2 PIN array. Chin. Opt. Lett., 18, 110602(2020).
[10] X. Deng, S. Mardanikorani, Y. Wu, K. Arulandu, B. Chen, A. M. Khalid, J. M. G. Linnartz. Mitigating LED nonlinearity to enhance visible light communications. IEEE Trans. Commun., 66, 5593(2018).
[11] A. R. Calderbank, T. Lee, J. E. Mazo. Baseband trellis codes with a spectral null at zero. IEEE Trans. Inf. Theory, 34, 425(1988).
[12] K. Igarashi, T. Tsuritani, I. Morita. Polybinary shaping for highly-spectral-efficient super-Nyquist WDM QAM signals. J. Lightwave Technol., 34, 1724(2016).
[13] J. S. Park, S. B. Gelfand, M. P. Fitz. A spectral shaping nonlinear binary coded modulation with Gray-mapped QAM signals. Milcom 2010 Military Communications Conference, 2363(2010).
[14] N. Stojanovic, C. Prodaniuc, F. Karinou, Z. Qiang. 56-Gbit/s 4-D PAM-4 TCM transmission evaluation for 400-G data center applications. Optical Fiber Communications Conference and Exhibition, Th1G.6(2016).
[15] S. Yamamoto, A. Masuda, H. Taniguchi, Y. Kisaka. 92-Gbaud PAM4 transmission using spectral-shaping trellis-coded-modulation with 20-GHz bandwidth limitation. Optical Fiber Communications Conference and Exhibition, W4I.5(2019).
[16] S. Yamamoto, H. Taniguchi, A. Matsushita, M. Nakamura, S. Okamoto, Y. Kisaka. Spectral-shaping technique based on nonlinear-coded-modulation for short-reach optical transmission. J. Lightwave Technol., 38, 466(2020).
[17] F. Buchali, F. Steiner, G. Böcherer, L. Schmalen, P. Schulte, W. Idler. Rate adaptation and reach increase by probabilistically shaped 64-QAM: an experimental demonstration. J. Lightwave Technol., 34, 1599(2016).
[18] H. Xin, K. Zhang, D. Kong, Q. Zhuge, Y. Fu, S. Jia, W. Hu, H. Hu. Nonlinear Tomlinson–Harashima precoding for direct-detected double sideband PAM-4 transmission without dispersion compensation. Opt. Express, 27, 19156(2019).
[19] X. Guo, N. Chi. Superposed 32QAM constellation design for 2 × 2 spatial multiplexing MIMO VLC systems. J. Lightwave Technol., 38, 1702(2020).
[20] H. Huang, P. Shih, C. Lin, Y. Cheng, W. Liang, C. Ho, C. Wei, A. Ng’oma. 2 × 2 MIMO OFDM-RoF system employing LMS-based equalizer with I/Q imbalance compensation at 60 GHz. IEEE Photonics J., 6, 7200307(2014).
