MUMBAI, India, Jan. 23 -- Intellectual Property India has published a patent application (202411101327 A) filed by Indian Institute Of Technology, New Delhi, on Dec. 20, 2024, for 'a system and a method of optimal designing of array of photodiodes for increased degree of freedom in li-fi.'
Inventor(s) include Aggarwal, Monika; Goel, Kretika; and Kar, Subrat.
The application for the patent was published on Jan. 23, under issue no. 04/2026.
According to the abstract released by the Intellectual Property India: "The invention relates to a receiver for visible light communication employing a sparse planar photodiode array arranged as a planar nested fractal configuration. A one dimensional sensor set is constructed by cross summation of a nested array and a fractal array, with inter element spacings constrained by d2=(2M+1)d1 to maximize virtual aperture. The set is extended into two dimensions via edge anchored rows and columns to form a contiguous layout whose difference coarray is hole free, yielding degrees of freedom that exceed the number of photodiodes for robust multi source direction of arrival estimation and demodulation. Embodiments integrate optical elements, low noise amplification, high resolution conversion, and digital processing for calibration, spatial smoothing, beamforming, interference suppression, and decoding. The architecture reduces power, cost, and mutual coupling while expanding field of view and sensitivity, enabling high speed Li Fi in dynamic environments and supporting systems, software, and manufacturing methods for scalable deployment."
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