Visible light/radio frequency hybrid cooperative communication method based on wireless energy harvesting and non-orthogonal multiple access

Abstract

The invention relates to a visible light / radio frequency hybrid cooperative communication method based on wireless energy harvesting and non-orthogonal multiple access, applied to a user cooperative communication system of visible light / radio frequency communication. The system comprises an LED light source and a user group, users in an area closer to the LED light source are near users; and otherusers in the user group are remote users. The method comprises the following steps; (1) within a first stage T time, the near users convert light signals emitted by the LED light source into electricenergy for storage; within a second stage 1-T time, the near users receive the light signals emitted by the LED light source, demodulate the light signals emitted by the LED light source, and demodulate information of the near users and the information of the remote users; and (2) the near users send the demodulated information of the remote users to the remote users through radio frequency signals by using the stored electric energy. In the communication method provided by the invention, the energy consumption problem of the user equipment is also considered, and an energy harvesting moduleis added, thereby being green and environmental friendly.

Description

technical field [0001] The invention relates to a visible light / radio frequency hybrid cooperative communication method based on wireless energy harvesting and non-orthogonal multiple access, and belongs to the technical field of communication systems. Background technique [0002] Visible light communication (VLC) has attracted more and more attention from academia and industry in recent years due to its advantages such as rich spectrum resources, low energy loss, large information capacity, and high security. The ubiquity of light-emitting diode (LED) lighting devices and their inherent visible light spectrum resources make the system an attractive and competitive solution for short-distance high-speed data transmission. But on the other hand, VLC also has its own limitations. The LED light source can only be limited to a small area and is easily blocked by obstacles. However, radio frequency (RF) signals can provide robust and ubiquitous transmission, so the combination ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the present invention provides a visible light / radio frequency hybrid cooperative communication method based on wireless energy harvesting and non-orthogonal multiple access; at the same time, wireless energy harvesting technology is added to solve the problem of limited energy of user equipment

Forwarding information near the user needs to consume part of the energy. In order to solve the problem of energy limitation near the user, the simultaneous information and energy transmission technology (SWIPT) is adopted at the near user end.

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