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Multi-colour LED specified bipolar colour shift keying scheme for visible light communications

Multi-colour LED specified bipolar colour shift keying scheme for visible light communications

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Colour shift keying (CSK) can achieve significant performance gains in multi-colour visible light communications (VLCs). Existing CSK constellations are designed within the positive domain which satisfies the requirement of non-negative optical intensity modulations. A scheme is proposed to incorporate spatial modulation with a CSK design by grouping LEDs. In this way, the CSK constellation is optimised within the entire real domain and hence achieves a larger minimum Euclidean distance so as to enhance the bit error rate (BER) performance. Simulation results show a noticeable performance gain by the proposed scheme compared with traditional CSK under ideal light-of-sight optical channels. Further, by experimental tests, an even more pronounced BER gain is achieved by the proposed scheme over real VLC channels.

References

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      • 4. Drost, R.J., Sadler, B.M.: ‘Constellation design for color-shift keying using billiards algorithms’. IEEE GC Workshops, Miami, FL, USA, 2010, pp. 980984.
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      • 7. Gao, Q., Gong, C., Wang, R., Xu, Z.Y., Hua, Y.B.: ‘Constellation design for multi-color visible light communications’. Available at https://arxiv.org/abs/1410.5932, accessed October 2014.
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      • 10. Beko, M., Dinis, R.: ‘Designing good multi-dimensional constellations’. Proc. of IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, USA, November 2010, pp. 14981502.
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