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 color space, belonging to the field of wireless optical communication. This scheme utilizes the color space provided by a laser diode LD consisting of four colored laser sources to carry information bits. The communication process of the system is divided into three steps. First, the information bits at the sending end are serially converted into three parts and enter the signal modulation module. The first part is used to select the LD activation mode, and the second part is mapped to the PAM modulation signal. The two parts are jointly mapped is the modulated signal s, the third part is mapped to the color signal s' of the LD, and the three parts together form the transmitted signal x, which is sent to the receiving end by the selected LD through the visible light channel, and finally the receiving end adopts the maximum likelihood detection method to process the received signal demodulation to restore the original signal. This scheme utilizes the degrees of freedom of the color domain and the space domain, effectively improves the transmission rate of the system, and improves the system performance.

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...

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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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