Illustration of new high bandwidth organic photovoltaic cells and their integration into MIMO visible light communication system (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Illustration of new high bandwidth organic photovoltaic cells and their integration into MIMO visible light communication system

Caption

a, Schematic of the OPV device architecture; b, fabricated OPV sample including eight individual cells and four common ground pads; c, block diagram of the multiple-input multiple output (MIMO) visible light data transmission system; d, experimental 2-by-2 MIMO setup with a single imaging lens; e, estimated and measured signal-to-noise ratio (SNR) of the two MIMO channels; f, adaptive bit loading applied to the orthogonal frequency division multiplexing (OFDM) data encoding scheme. The organic materials used in the OPV are PTB7-Th and EH-IDTBR. The subcarriers that exhibit the highest SNR are exposed to signals with up to 256 unique signal constellation points leading to the transmission of 8 (log2(256)) bits per transmission step. For comparison, on-off keying (OOK) would only allow one bit per transmission. In the 2-by-2 MIMO system, there are two independent channels and consequently, the maximum number of bits that can be transmitted per transmission step is 16 in the high SNR regions.

Credit

by Iman Tavakkolnia, Lethy K. Jagadamma, Rui Bian, Pavlos P. Manousiadis, Stefan Videv, Graham A. Turnbull, Ifor D. W. Samuel and Harald Haas

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