Precoding MU-MIMO (Multiuser-Multiple Input Multiple Output) indoor visible light communication system based on white light LED (Light-emitting Diode)

Abstract

The invention discloses a precoding MU-MIMO indoor visible light communication system based on a white light LED. The system comprises a transmitting terminal device and a plurality of user terminals, wherein the transmitting terminal device comprises an input signal processing unit and a plurality of white light LED light sources that are respectively connected with the input signal processing unit. Each white light LED light source comprises a drive circuit, a brightness control circuit, and an LED array. Each user terminal comprises a signal outputting and processing unit and at least one light receiver connected with the signal outputting and processing module. The input signal processing unit comprises a modulating circuit and a precoding module, wherein the modulating circuit modulates a to-be-transmitted signal and then outputs the signal to the precoding module; and the precoding module is used for solving a precoding matrix according to state information of a signal channel and precoding the modulated signal. The signal outputting and processing unit comprises am amplifier module, a decoding module and a demodulating circuit. The precoding MU-MIMO indoor visible light communication system based on the white light LED can completely avoid the multiuser interference and effectively reduce the complexity of a receiving terminal.

Description

technical field [0001] The invention relates to an indoor MIMO visible light communication system, in particular to an indoor MU-MIMO visible light system for high-speed data transmission based on white light LEDs. Background technique [0002] White light LED has the advantages of low power consumption, long service life, small size, and environmental protection, and is regarded as the fourth generation of energy-saving and environment-friendly lighting products. Another outstanding advantage of white LEDs is that the response time is very short, so LEDs can be used for ultra-high-speed data communication. Currently, one of the main challenges of VLC is the low modulation bandwidth of white LEDs, usually only a few MHZ. But the prescribed lighting level ensures that we get a high signal-to-noise ratio (SNR). The large number of channels with high signal-to-noise ratio and low bandwidth makes the use of MIMO technology to achieve high data rate transmission an attractive o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the multi-user interference problem existing in the prior art, and provide a pre-coded MU-MIMO indoor visible light communication system based on white light LEDs, and use pre-coded technology to transfer the task of interference elimination to the sending end , can effectively solve the MUI problem existing in the MU-MIMO indoor visible light system, and reduce the complexity and power consumption of the receiver

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