A visible light camera communication system using mimo array architecture of led lamps

Abstract

The present invention is a visible light camera communication system adopting the MIMO array structure of LED lamps. The transmitter adopts the MIMO array structure. Each LED wick is equipped with an independent FSOOK modulation drive power supply. The transmitter is equipped with an LED-ID connected to the FSOOK modulation drive power supply. Data modulation mapper; the LED‑ID data modulation mapper is preset with an information mapping table, and the LED‑ID data modulation mapper modulates the serial binary LED‑ID data into parallel multiple FSOOK frequency signals according to the information mapping rules. The signal is mapped to multiple independent LED power sources to drive each wick to flash at different frequencies; the receiver uses a CMOS image sensor with a rolling shutter mechanism to take pictures of the LED array light source, and the exposure time needs to be selected to prevent exposure when taking pictures High light noise interference caused by excessive; the light source forms multiple stripe pictures with different light and dark stripe widths on the CMOS image sensor, and the receiver decodes the picture after obtaining a complete picture composed of multiple stripe sub-graphics.

Description

technical field [0001] The present invention faces the field of LED visible light communication positioning, and proposes a visible light camera communication system adopting an LED lamp multiple-input multiple-output (MIMO) array architecture. Background technique [0002] Using a mobile phone with a CMOS image sensor (CIS) to receive the LED light signal can realize low-rate information transmission by detecting the light and dark stripe pictures formed by the flashing LED. In order to make the blinking LEDs form a light and dark fringe picture on the imaging plane, the CMOS image sensor should use a rolling shutter. Some technologies have proposed a visible light communication system such as figure 1 As shown, the transmitter uses an LED light source driven by on-off keying (OOK) modulation, and the receiver uses a CMOS image sensor to form a light and dark fringe picture, and the OOK signal is demodulated by performing image processing on the light and dark fringe pictu...

AI Technical Summary

Problems solved by technology

However, the information transmission rate of this visible light camera communication system driven by FSOOK modulation is very low, and the receiver’s processing of multi-frame stripe pictures is also relatively complicated, and it is necessary to wait for all pictures to be decoded before obtaining a complete LIED-ID. It inevitably brings a certain processing delay, and also puts forward higher requirements for the receiver's continuous shooting and processing capabilities

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