In this paper, we consider a laser-based spatial multiplexing multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) optical wireless communication (OWC) system architecture as a costeffective solution for terabit inter-rack communication in sixth generation (6G) data center networks (DCNs). We put forward the design of a multi-element non-imaging receiver based on compound parabolic concentrators (CPCs). Simulation results show that the proposed receiver design supports aggregate data rates above 1 Tb/s under any type of misalignment errors for typical link distances between the racks in a DCN.
To achieve multi-Gb/s data rates in 6G optical wireless networks based on narrow infrared (IR) laser beams, a high-speed receiver with a sufficiently large aperture and a wide field-of-view (FOV) is needed. In this work, we analyze the performance of imaging receivers, identify the existing design tradeoffs, and propose an optimized imaging receiver design with the objective to support multi-Gb/s data rates. It is shown that a simple imaging receiver composed of a converging lens and a 2 × 2 photodetector (PD) array can support data rates above 10 Gb/s while offering half-angle FOVs of up to 4.5◦.
Radio frequency (RF) signals propagate through most materials that we are surrounded by while light is blocked by many of these materials. This feature makes wireless networks based on light (which are also referred to as LiFi networks) inherently more secure. However, it can also lead to sudden link failure if the legitimate data link is blocked because of user movements or changes in device orientation. In this paper, the secrecy capacity has been analysed with the consideration of imperfect channel state information, random device orientation and probability of link blockage for the case of a single eavesdropper. It has been found that the secrecy capacity almost doubles in a standing activity as opposed to a sitting activity and that the density of blocking objects degrades the secrecy capacity in single access point networks. It is evident that environmental factors and user behaviour have a significant impact on the secrecy performance and, thus, need to be considered for robust physical layer security (PLS) design in LiFi networks.
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