Abstract
Visible light communication (VLC) is an upcoming wireless communication technology. In a VLC system, signal integrity under low illumination intensity and high transmission frequencies are of great importance. Towards this direction, the performance of the analog front end (AFE) sub-system either at the side of the transmitter or the receiver is crucial. However, little research on the AFE of the receiver is reported in the open literature. Aiming to enhance signal integrity, three pre-amplification topologies for the VLC receiver AFE are presented and compared in this paper. All three use bipolar transistors (BJT): the first consists of a single BJT, the second of a double BJT in cascade connection, and the third of a double BJT in Darlington-like connection. In order to validate the performance characteristics of the three topologies, simulation results are provided with respect to the light illumination intensity, the data transmission frequency and the power consumption. According to these simulations, the third topology is characterized by higher data transmission frequencies, lower illuminance intensity and lower power consumption per MHz of operation.
Highlights
Visible light communication (VLC) is a promising scientific field in which the interest of the research community has increased significantly during the last decade
A first demonstration of a Light Fidelity (Li-Fi) network during a TEDx talk by Harald Haas [3] highlighted the innovation brought about by this promising wireless communication and resulted in an exponential increase on research output related to VLC, optical wireless communications (OWC) and free-space optical communications (FSOC)
The electrical model of the analyzed. Both are exploited in the simulations of the receiver, which were performed in photodiode is presented and the structure of a typical signal that feeds a VLC receiver is the LTSpice XVII platform of Analog Devices
Summary
Visible light communication (VLC) is a promising scientific field in which the interest of the research community has increased significantly during the last decade. In [10] the authors studied the possibility of using LEDs for VLC systems, presenting the requirements for such a system to act for lighting and communication at the same time. High-precision internal positioning systems, such as Epsilon [16] and Luxapose [17], have come to light since 2014 In the former, many LED lamps (transmitters) and photodiodes (receivers) were used to implement a low-cost system, with the ability to find the position with an error of 0.4 m. The above encoding schemes are well defined by the standard, there is considerable research on alternative ways of error detection and correction, such as the use of polar code (PC) instead of RS in CSK modulation VLC systems [24] or with a protograph low-density parity-check (LDPC) code of two types [25].
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