Working method of indoor VLC multi-stream spatial modulation system based on color space

Abstract

The invention discloses a working method of an indoor VLC multi-stream spatial modulation system based on a color space, and belongs to the field of wireless optical communication. According to the scheme, a color space provided by a laser diode LD composed of four color laser sources is used for bearing information bits. The communication process of the system comprises three steps. The method comprises the following steps: firstly, information bits of a sending end are converted into three parts through serial-parallel conversion, and the information bits enter a signal modulation module; the first part is used for selecting an LD activation mode, the second part is mapped into a PAM modulation signal, and the two parts are jointly mapped into a modulation signal s, the third part is mapped into a color signal s' of an LD, the three parts jointly form a sending signal x, the sending signal x is sent to a receiving end by the selected LD through a visible light channel, and finally, the receiving end demodulates the received signal by adopting a maximum likelihood detection method to recover an original signal. According to the scheme, the degree of freedom of the color domain andthe spatial domain is utilized, the transmission rate of the system is effectively increased, and the system performance is improved.

Description

technical field [0001] The invention relates to a working method of an indoor VLC multi-stream spatial modulation system based on color space, and belongs to the field of wireless optical communication. Background technique [0002] In recent years, with the vigorous development of communication technology in my country, the demand of end users is increasing day by day, and users have higher requirements for the rate and quality of wireless transmission, which makes the spectrum resources in the communication field increasingly scarce. Visible light communication (VLC) technology, as a new type of wireless communication technology, has the advantages of high communication capacity, large transmission bandwidth, fast transmission rate, strong anti-interference ability and good confidentiality, and the VLC system has both lighting and communication functions. , so it is necessary to ensure the lighting function of the system while performing data transmission. As a new type o...

AI Technical Summary

Problems solved by technology

The above solutions are subject to certain limitations in terms of system transmission rate and spectrum efficiency, and cannot effectively improve system performance.

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