Optimization method of multi-source multi-carrier visible light communication system under non-flat channel

Abstract

The invention discloses a method for optimizing a visible light communication system with multiple light sources and multiple carriers under an unsmooth channel. The method comprises the following steps: (1) setting parameters of the visible light communication system with multiple light sources and multiple carriers, wherein the parameters comprise a channel parameter, a noise size and the maximum light power, and using the maximum data rate R as an optimization target; (2) optimizing DC bias b to obtain optimized DC bias b*; (3) optimizing a normalized beamforming vector {uk} to obtain an optimized normalized beamforming vector (the formula is as shown in the specification), k=1,..., K-1, wherein K is the total number of subcarriers; and (4) obtaining an approximately optimal beamforming vector omega* according to the normalized beamforming vector (the formula is as shown in the specification). According to the optimization method disclosed by the invention, the system hardware and other external conditions do not need to be changed, and the system performance can be greatly improved just by simple calculation; when the maximum light power of the system is limited, the optimized system light intensity can kept constant and can take lighting into account; and the optimization method disclosed by the invention is high in convergence speed, easy to implement and high in robustness.

Description

technical field [0001] The invention relates to the field of visible light communication, in particular to an optimization method for a multi-light source and multi-carrier visible light communication system under an uneven channel. Background technique [0002] Visible light communication (VLC) is an emerging access technology that takes into account both lighting and communication, and can meet high-speed data services. It has many advantages including low cost, green safety, good confidentiality, easy implementation, and good electromagnetic compatibility. . [0003] A large number of broadband visible light communication systems adopt multi-carrier technology, which is easy to implement and can obtain higher spectral efficiency and power efficiency. The combination of multi-carrier technology and visible light communication technology makes it have the advantages of both visible light communication and multi-carrier technology. It is a technology with high research sign...

AI Technical Summary

Problems solved by technology

Too much DC bias will waste energy, while too small will cause serious signal distortion; too much effective power can strengthen the signal but will increase clipping

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