A MIMO-ANN system for increasing data rates in organic visible light communications systems (original) (raw)
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Exploiting Equalization Techniques for Improving Data Rates in Organic Optoelectronic Devices for Visible Light Communications, 2012
This paper presents the use of equalization techniques in visible light communication (VLC) systems in order to increase the data rate. Here we investigate two VLC links a silicon (Si) light emitting diode (LED) and an organic photodetector (OPD), and an organic LED (OLED) plus an Si photodetector (PD), together with three equalization schemes of an RC high pass equalizer, a fractionally spaced zero-forcing equalizer (ZF) and an artificial neural network (ANN). In addition we utilize a pre-distortion scheme to enhance the performance of the digital equalizers. For both systems the bit rate achieved are 750 kb/s from a raw bandwidth (BW) of 30 kHz and 550 kb/s from a raw BW of 93 kHz.
A 1 Mb/s Visible Light Communications Link with Low Bandwidth Organic Components
This letter presents new experimental results on a 1-Mb/s organic visible light communications system. These results are the first demonstration of a fully organic free space optical communications system. Due to low charge transport characteristics, organic devices are typically highly band limited in the hundreds of kilohertz region (up to 135 kHz in this letter). Therefore, an artificial neural network (ANN) equalizer is required to undo the effects of intersymbol interference. Without the ANN, the maximum link performance corresponds to a data rate of 350 kb/s; however, with the ANN, a transmission speed of 1.15 Mb/s could be supported.
Visible Light Communications with Organic Light Emitting Diodes
IEEE Communications Magazine
Organic visible light communications (OVLC) is an emerging subset of visible light communications (VLC) that uses organic photonic components as the link transmitter, receiver or both. Recent developments in organic light emitting diodes (OLEDs) have enabled high efficiency and brightness devices that can be used for data transmission as in conventional VLC systems. VLC utilises the visible wavelength range of the electromagnetic spectrum (370 – 780 nm). Here we demonstrate an OVLC link using an OLED with 93 kHz bandwidth as the source and a silicon photodetector with 5 MHz BW and a 10 dB gain as the receiver. A wide range of modulation schemes are examined and as is commonplace in communications systems; equalization techniques are implemented to maximize data rates into the Mb/s region and 2.7 Mb/s was achieved.