KEYWORDS: Receivers, Telecommunications, Transmitters, Visible radiation, Light emitting diodes, Mobile communications, Systems modeling, Signal to noise ratio, Data transmission, Manufacturing
Visible light communication (VLC) has become a research hotpot in the Industrial Internet of Things (IIoT). In VLCIIoT systems, the overlapping areas between adjacent transmitters cause severe signal interference. The random movement of mobile terminals in these areas seriously affect the robustness of system communication. In this paper, a cubic receiver with optimal rotation angle that adapts to user’s movement is proposed to solve the problem. Firstly, there are adaptive channel estimation and signal recovery method for rotating cubic receiver to achieve signal receiving and combining in both non-overlapping and overlapping areas. Secondly, we maximize the channel capacity to optimize the rotation angle for further improving communication performance and channel gain. Results show that rotating cubic receiver can better support user mobility in all directions and system performance is enhanced by optimizing rotation angles. Especially, the bit-error-rate (BER) performance gains more in non-overlapping areas than overlapping areas under optimal rotation angles.
In the optical wireless communication system, a reliable transmission channel can be achieved in the power restricted scene by using a single-photon avalanche diode (SPAD) receiver. However, the performance of SPAD is limited by dead time. This results in count loss and inter-slot interference (ISI), which degrades the communication performance. In this paper, a 4-channel time-gated scheme was proposed. In the scheme, time-gated SPAD receivers successively turned on by external gating signals to reduce the effective dead time of the receiving system and improve the signal-to-noise ratio. In addition, the 4 time-coordinated receivers scheme has better background light tolerance and better performance in intensive signal power condition than the 4 free-running SPADs receivers scheme.
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