title: Performance improvement by tilting receiver plane in M-QAM OFDM visible light communications.
abstract: 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.
authors: Network Technology Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.
authors: Zixiong
authors: Z
authors: Wang
authors: Changyuan
authors: C
authors: Yu
authors: Wen-De
authors: WD
authors: Zhong
authors: Jian
authors: J
authors: Chen
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D012666:Semiconductors; D013685:Telecommunications / Q000295:instrumentation*