Indoor wireless coverage transmission system based on DTV-VLC

Abstract

The invention provides an indoor wireless coverage transmission system based on DTV-VLC. The system comprises a power supply, a plurality of LED lamps, a PLC coupler, a home multimedia gateway and a DTV signal source, wherein the LED lamps, the PLC coupler and the home multimedia gateway are electrically connected with the power supply; when receiving a broadcast signal of a wired household DTV signal source, the home multimedia gateway decodes at first to obtain DTV program data stream, and then carries out coded modulation and framing according to a DTMB standard again; when receiving a ground DTMB signal, the home multimedia gateway directly forwards the ground DTMB signal through a VLC (visible light communication, Visible Light Communication) channel; finally, downlink signals of the LED lamps are demodulated and decoded by a DTV-VLC receiving terminal unit in a receiving unit; in a wireless coverage transmission process of the DTV-VLC, a TDS-OFDM signal from the home multimedia gateway and acquired by demodulating the DTMB is coupled to a power line by the PLC coupler at first, is transmitted on the power line to drive the LED to transmit a light signal carrying information, and if collected by a light sensor of the receiving terminal at last.

Description

[technical field] [0001] The invention relates to the technical field of visible light wireless communication, in particular to a DTV-VLC-based indoor wireless coverage transmission system with fast transmission speed, high efficiency, convenient use and wide wireless communication coverage. [Background technique] [0002] Many existing wireless access technologies have revealed a lot of problems in the background of the demand for terrestrial digital TV signal access. Traditional WiFi technology is a common wireless network transmission and access technology, which has been widely used in various places. However, due to the tight spectrum, the communication capacity is limited, and in some areas with heavy traffic, it cannot meet the needs of people to watch high-definition videos at the same time. At the same time, WiFi cannot be applied in some places with electromagnetic shielding or electromagnetic interference. Since the signal is easy to pass through the wall, it is...

AI Technical Summary

Problems solved by technology

This requires implanting a PLC demodulation module (including the necessary DC power supply module) in the narrow lighting space, which will inevitably require large-scale transformation of existing lighting, which is complicated and difficult to be practical. For the uniformity of lighting, it is necessary to There are overlapping areas of lighting, and the more severe challenge faced by this type of system is: if the information sent between adjacent lights is different, there will inevitably be light interference other than natural light

[0004] Since visible light communication is very sensitive to occlusion, the movement of the user terminal will inevitably cause communication interruption due to factors such as body occlusion, and it is necessary to switch between LED lights frequently during the movement process

There are also extremely high requirements on the real-time performance of terminal equipment, network equipment, resource management and scheduling, etc., which is difficult to be practical

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