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

Abstract

The invention discloses an optimization method for a multi-light source and multi-carrier visible light communication system under a flat channel. The optimization method comprises the following steps of (1) setting parameters, including a channel parameter, a noise amplitude and maximum optical power, of the multi-light source and multi-carrier visible light communication system and carrying out optimization by adopting a maximal data rate R as the target; (2) introducing an intermediate variable x and solving an optimal solution x*; and (3) carrying out joint optimization on DC bias b and a beam forming vector omega according to the optimal intermediate variable x*. According to the optimization method, external conditions, such as system hardware do not need to be additionally changed, the system performance can be greatly improved only through simple calculation, the data rate of the system can be maximized by adopting the DC bias and the beam forming vector obtained through the optimization method; when the maximal optical power of the system is limited, the light intensity of the optimized system can be kept constant and illumination can be taken into account. The optimization method is high in convergence rate, easy to implement, high in result accuracy 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 a flat 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 signifi...

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