[1] [1] BAO J J, CHEN I, PENG C M. Data transmission scheme based on the DC-QOSTBC in indoor MIMO-VLC systems [J]. Applied Optics, 2021, 60(18): 5365-5375.

[2] [2] FATH T, HAAS H. Performance comparison of MIMO techniques for optical wireless communications in indoor environments[J]. IEEE Transactions on Communications, 2013, 61(2): 733-742.

[3] [3] QIAO L, LU X, LIANG S, et al. Performance analysis of space multiplexing by superposed signal in multi-dimensional VLC system [J]. Optics Express, 2018, 26(16): 19762-19772.

[4] [4] GUO X, YUAN Y, ZHAO Y, et al. Flipped superposed constellation design for MIMO visible-light communication systems [J]. Optics Express,2022, 30(7): 11588-11603.

[5] [5] ZOU P, ZHANG J, LI G, et al. Optimizations of probabilistic constellation shaping superposition schemes for the MISO visible light communication system [C]//OSA. Proceedings of 2021 Optical Fiber Communication Conference (OFC). San Francisco: OSA, 2021: F1A.8-1-F1A.8-3.

[6] [6] DONG Z, CHEN Y, ZOU D, et al. DMT transmission in short-reach optical interconnection employing a novel bit-class probabilistic shaping scheme[J]. Joumal of Lightwave Technology, 2021, 39(1): 98-104

[7] [7] DING J, ZHANG J, WEI Y, et al. Comparison of geometrically shaped 32-QAM and probabilistically shaped 32-QAM in a bandwidth-limited IM-DD system[J]. Journal of Lightwave Technology, 2020, 38(16): 4352-4358.

[8] [8] XU Z, NIU W, SHI J, et al. Nonlinear coded nonuniform superposition QAM by trellis-coding for MISO system in visible light communication[J].Chinese Optics Letters, 2022, 20(4): 042501-1-042501-6.

[9] [9] YAMAMOTO S, TANIGUCHI H, MATSUSHITA A, et al. Spec-tral-shaping technique based on nonlinear-coded-modulation for short-reach optical transmission [J]. Journal of Lightwave Technology, 2020, 38 (2):466-474.

[10] [10] CHI N, SHI M. Advanced modulation formats for underwater visible light communications [Invited][J]. Chinese Optics Letters, 2018, 16(12): 12063-1-12063-10.