Signal detection method and system of constant threshold in wireless optical communication

Abstract

The invention discloses a signal processing and judgment method and system for judging by adopting constant threshold in wireless optical communication. The method comprises the following steps: performing analog-to-digital conversion on signal optical current, and then performing digital low-pass filtering to extract atmospheric channel light intensity scintillation information, and dividing thelow-pass filter output by a digital receiving signal, and then judging a to-be-judged signal by taking the constant value as the judgment threshold. The system comprises a light source, a signal source, an intensity modulator, a transmitting antenna, an atmospheric channel, a receiving antenna, a photoelectric detector, an analog-to-digital converter, a delay module, a low-pass filter, a divisionoperation module and a judgment module. The method disclosed by the invention has high instantaneity since the method is not involved with any frame structure processing and complex operation; and themethod does not need a complex hardware module, so that the method is especially suitable for the high-speed and large-capacity data transmission application.

Description

technical field [0001] The invention belongs to the technical fields of optics, optoelectronics, electronics and optical communication, and relates to a signal detection technology in optical communication, in particular to a signal detection method for an adaptive threshold in wireless optical communication and a wireless optical communication system. Background technique [0002] In recent years, Wireless Optical Communication (OWC) has attracted extensive research and application due to its high data rate, low system cost, easy installation, anti-electromagnetic interference and license-free. Due to these characteristics, the OWC system becomes an attractive solution for scenarios such as high-capacity communication, emergency communication, temporary communication, and last-mile problems. Due to the high complexity of the coherent system, most of the existing OWC systems adopt the intensity modulation direct detection (IM / DD) scheme. In particular, on-off keying (OOK) m...

AI Technical Summary

Problems solved by technology

But its disadvantages are also obvious. The launch of multiple laser carriers requires multiple lasers and detectors, which increases the hardware complexity of the system.

[0008] It can be seen that the existing decision threshold selection schemes have problems such as loss of bandwidth efficiency, poor real-time performance, or high hardware complexity, and are not suitable for high-speed and large-capacity communications.

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