A communication method and system combining power line communication and optical communication

Abstract

The invention provides a communication method with combination of electric wire communication and light communication. The communication method comprises the following steps that: S1, a transmitting terminal performs code modulation, framing and analog front end treatment on a digital signal to be transmitted according to a predetermined transmission mode, so that a transmitting signal is obtained and coupled to an electric power circuit for transmission; S2, a transfer terminal extracts an electric signal through a coupler and then delivers the electric signal to a light emitting diode (LED); after the automatic gain control process, a voltage signal is converted to a current signal by an LED driving unit to perform light intensity modulation on the LED; S3, a receiving terminal receives the light signal through a photoelectric detector and then converts the light signal to an electric signal according to the light intensity; the transmission digital signal is obtained through the analog front end process, the synchronization, demodulation and decoding. By adopting a generic technology, the seamless combination of a power line network and the LED light communication is achieved, two signals are combined into one; the electric signal transmitted by the electric power circuit can be emitted out in a manner of wireless light communication through the LED without signal regeneration, so that the wideband high-speed signal transmission is implemented.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a communication method and system combining power line communication and optical communication. Background technique [0002] With the rapid development of communication technology, the contradiction between rapidly expanding wireless communication service requirements and spectrum resources is increasingly intensified. Exploring new spectrum resources has become a hot issue in the field of wireless communication today. As an emerging wireless communication technology that uses light waves as the information transmission carrier, optical communication has the advantages of wide transmission frequency bandwidth, large communication capacity, safety and environmental protection, no electromagnetic interference, and no need to occupy existing spectrum resources. It has attracted much attention in recent years. [0003] Since the 1990s, the rapid development of LED ...

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Problems solved by technology

[0007] To realize a communication system combining power line communication and optical communication, there are some problems: 1. How to realize the seamless integration of the two communication systems, and realize the mutual conversion of electrical signals and optical signals conveniently and quickly; According to the characteristics and business requirements, choose the transmission mode reasonably, and improve the reliability of transmission as much as possible

In the optical communication system, multiple LED light sources are often used to achieve good lighting effects, and the indoor environment also has a reflection effect on the lighting, so the multipath effect has a significant impact on the indoor LED optical communication system; the line structure of the power line Complicated, the signal can reach the terminal through multiple paths, and there will be signal reflection at the load, which makes the power line communication also have serious multipath effects

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