Experimental 5G New Radio integration with VLC

International audienceIn this paper, integration of 5G New Radio (5G NR) with a Visible Light Communication (VLC) downlink architecture is proposed. This scheme combines two complementary wireless technologies: upcoming 5G NR and VLC to offer indoor enhanced wireless hybrid access able to provide each User Equipment (UE) with very high data rate and positioning support. The data transmission of the 5G NR frame over VLC has been implemented. This represents a novel approach to transmitting 5G NR over VLC by hardware experimentation based on Universal Software Radio Peripheral (USRP). The experiment results show that the proposed scheme with Quadrature Phase Shift Keying (QPSK) mapping achieves a data rate of 14.4 M bits/s and an Error Vector Magnitude (EVM) of 4.78% for a 55 cm free space transmission span

An experimental analysis of the effect of reflections on the performance of visible light positioning systems in warehouses

In this paper, an experimental evaluation of the effect of multipath reflections on two 3D positioning algorithms is experimentally compared. The VLP algorithms use the received signal strength (RSS) for estimating the receiver`s 3D position without prior knowledge of its height. An experimental overall median accuracy of 10.5 cm was achieved in a 4 x 4 x 4.1 m3 test area. The effect of multipath reflections was recreated using a storage shelf rack that is similar to the ones used in warehouses and was placed 26 cm away from the path. The results demonstrate the degrading effect of reflections on two and three-dimensional positioning systems. The reflection`s effect was especially severe due to reflections from a metal beam. The achieved median errors using the two different algorithms were 7.5 and 6.6 cm before the addition of a shelf rack, and they increased to 11.7 and 12 cm after the shelf rack was added. Multipath reflections increased the median positioning errors by 112% in 2D systems and by 69% for 3D systems. The paper demonstrates the degrading effect of multipath reflections on VLP systems and highlights the need to take it into consideration when evaluating VLP systems

A Hybrid Variable m-CAP-Based Indoor Visible Light Communications and Fingerprint Positioning System

A variable multi-band carrier-less amplitude and phase (m-CAP)-based indoor hybrid visible light link for data communications and positioning is investigated in this paper. Here, we have adopted the fingerprinting algorithm for positioning. Both the link performance in terms of the bit error rate (BER) and the positioning error (PE) are evaluated for a range of Eb/N0 and step sizes for the data communications and localization, respectively. Results show that, the best PE value and the spectral efficiency of the proposed system are ~2 cm and 6.15 b/s/Hz with respect for a step size of 2 cm and a 7% forward error correction BER limit of 3.8 × 10-3, respectively

Li-Pos: A Light Positioning Framework Leveraging OFDM for Visible Light Communication

The design of solid-state lighting is vital, as numerous metrics are involved in their exact positioning, and as it is utilized in various processes, ranging from intelligent buildings to the internet of things (IoT). This work aims to determine the power and delay spread from the light source to the receiver plane. The positions of the light source and receiver were used for power estimation. We focus on analog orthogonal frequency-division multiplexing (OFDM) in visible light communication (VLC) and assess the area under the curve (AUC). The proposed system was designed using modulation techniques (i.e., quadrature amplitude modulation; QAM) for visible light communication (VLC) and pulse-width modulation (PWM) for dimming sources. For the positioning and spreading of brightness, the proof-of-concept was weighted equally over the entire area. Therefore, the receiver plane was analyzed, in order to measure the power of each light-emitting diode (LED) in a given area, using the delayed mean square error (MSE). A framework was applied for the placement of LEDs, using full-width at half-maximum (FWHM) parameters with varying distances. Then, the received power was confirmed. The results show that the AUC using DRMS values for LEDs significantly increased (by 30%) when the number of source LEDs was changed from four to three. These results confirm that our system, associated with the simple linear lateration estimator, can achieve better energy consumption