Signal detection method and device and visible light communication system

Abstract

The embodiment of the invention discloses a signal detection method and device and a visible light communication system. The signal detection method comprises the following steps: performing first transformation on a first constellation corresponding to a first electric signal output by a photon detector in advance to obtain a second constellation in which constellation points are distributed at equal intervals; determining a judgment threshold sequence based on the second constellation; when the first electric signal output by the photon detector is received, converting the first electric signal into a second electric signal following Gauss distribution through the first transformation; and detecting the second electric signal based on the predetermined judgement threshold sequence. The constellation points of the second constellation are regularly distributed at equal intervals, so that the judgement threshold sequence determined according to the second constellation is also regular, and the second signal can be detected based on the judgement threshold sequence through a relatively simple detection algorithm, thereby lowering the signal detection complexity in a visible light communication process.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a signal detection method, device and visible light communication system. Background technique [0002] As an emerging way of wireless communication, visible light communication (VisibleLightCommunication, VLC) is developing rapidly due to its advantages of green spectrum resources, controllable communication range, and high transmission speed. [0003] The visible light communication system includes an optical signal transmitting part and an optical signal receiving part, wherein the optical signal transmitting part modulates the electrical signal and transmits the carrier frequency to a light-emitting diode (Light-EmittingDiode, LED) lamp, and transmits the signal through the visible light emitted by the LED lamp. The optical signal receiving part converts the received optical signal into an electrical signal through a photon detector (such as a Single Ph...

AI Technical Summary

Problems solved by technology

Since the observation object of the photon detector is photons, the electrical signal converted by the photon detector introduces the randomness of the particles, making the transmission channel of the electrical signal a Poisson channel, that is to say, the electrical signal output by the photon detector Obey the Poisson distribution, resulting in the complexity of signal detection increasing exponentially with the modulation order of the signal

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