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Opt Express. 2011 Jul 4;19(14):13418-27. doi: 10.1364/OE.19.013418.

Performance improvement by tilting receiver plane in M-QAM OFDM visible light communications.

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Network Technology Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.


We propose a scheme to improve the SNR distribution as well as the spectral efficiency of M-QAM OFDM signal for indoor visible light communication by tilting the receiver plane. Newton method is employed for the photo-detector to receive maximum power by finding the optimal tilting angle. This method is a fast algorithm that only three searching steps are needed. The simulation results show that in the case of one LED source, the maximum spectral efficiency improvement is 0.44bit/s/Hz when the launching power of LED source is 12W; while in the case of four LED sources, the maximum spectral efficiency improvement is 0.21bit/s/Hz when the total launching power of the four LED sources is 12W.

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