High-speed indoor visible light communication system employing laser diodes and angle diversity receivers

Abstract

The two main challenges facing high data rate visible light communication (VLC) are the low modulation bandwidth of the current transmitters (i.e. light emitting diodes, LEDs) and the inter symbol interference (ISI) caused by multipath propagation. In this paper, we evaluate laser diodes (LDs) as a source of illumination and communication instead of LEDs for a VLC system in conjunction with an angle diversity receiver (ADR). The main advantage of using LDs is their high modulation bandwidth that enables communication at data rates of multi gigabits per second for VLC when using a suitable receiver, such as an ADR, which mitigates the ISI. Our proposed system uses simple on-off keying (OOK) modulation, and it is able to provide data rates of 5 Gbps and a bit-error-rate (BER) of 10 -6 in the worst case scenario.

10 Gbps Mobile Visible Light Communication System Employing Angle Diversity, Imaging Receivers, and Relay Nodes

“…The challenge in both rooms is the ability to establish LOS communication link between transmitter and receiver at all relevant locations. We have used the previously introduced LDs, delay adaptation and imaging receiver, and we have achieved 10 Gbps in a realistic environment, which is a 2x increase in data rate compared with [23] and [24], and in the current work we introduce the concept of relays in VLC systems for the first time. The main difference between the proposed VLC systems in this study and traditional VLC systems is the use of RGB LDs as the transmitters instead of LEDs.…”

“…An angle diversity receiver (ADR) and an imaging receiver are solutions that can tackle the signal spread caused by multipath in a VLC system [3], [30], [31]. A three branch ADR with RGB LD has been proposed in [24], and 5 Gbps was achieved in an empty room. Our previous work in this area has shown that significant enhancements can be achieved when using an imaging receiver [23].…”

25 Gbps mobile visible light communication system employing fast adaptation techniques

“…Previous work has shown that significant enhancements in the VLC system data rates can be achieved by replacing LEDs with LDs coupled with the use of an imaging receiver instead of the conventional wide field of view (FOV) receiver [4], [5], [6]. A data rate of 10 Gbps in a realistic environment has been shown to be possible with a VLC system when a delay adaptation technique in conjunction with laser diodes and imaging receiver were used with a simple modulation format (on-off keying, OOK) and without the use of relatively complex wavelength division multiplexing approaches [4].…”

Fast and Efficient Adaptation Techniques for Visible Light Communication Systems

“…Recently, we proposed the use of an angle diversity receiver (ADR) for a VLC system to provide a robust link and mitigate multipath dispersion, as well as to improve the overall system performance [14]. In this study we used an ADR with selective combining to choose the best branch.…”

“…Previous work has shown that significant enhancements in the VLC system data rates can be achieved by replacing LEDs with LDs coupled with the use of an imaging receiver instead of the conventional wide field of view (FOV) receiver [13], [14], [15]. A data rate of 10 Gbps in a realistic environment has been shown to be possible with a VLC system when a delay adaptation technique in conjunction with laser diodes and imaging receiver were used with a simple modulation format (OOK) and without the use of relatively complex wavelength division multiplexing approaches [13].…”