Method for blind detection of receiver according to wireless optical communication

Abstract

The invention discloses a method for blind detection of a receiver according to wireless optical communication. A wireless optical communication system adopts an intensity-modulation direct detection system; a transmitter of the system transmits signals; and the signals are output to the receiver of the system after signal denoising and twice threshold judgment, so that blind detection of the receiver is realized. The process of signal denoising and twice threshold judgment comprises the following steps: conducting denoising treatment on the received signals according to a modified wavelet transform threshold denoising algorithm; and recovering the digital signals through twice threshold judgment, so that the whole signal detection process is fulfilled. According to the method disclosed by the invention, noise introduced in the signal transmission process can be suppressed to a great extent, so that the bit-error-rate performance can be better, and blind detection can be realized under an unknown channel state condition; and the method has better noise performance and lower algorithm complexity, and can reduce impact of an atmospheric channel and noises on an optical signal, and improve the sensitivity of the detection system.

Description

technical field [0001] The invention belongs to the field of wireless optical communication, and relates to a receiver processing algorithm of wireless optical communication, in particular to a method for blindly detecting receivers of wireless optical communication. The method can reduce the influence of atmospheric channels and noise on optical signals. Background technique [0002] With the continuous development of wireless communication technology, people's requirements for communication speed, mode, coverage, reliability and security are constantly increasing. Under this demand, wireless optical communication has entered people's field of vision as a new communication method, and has become one of the key technologies that are widely valued. However, wireless optical communication systems generally use atmospheric channels as the transmission medium. The randomness of atmospheric channels, background light interference, and noise from photodetectors will have a greater...

AI Technical Summary

Problems solved by technology

Although these algorithms reduce the bit error rate of the communication system to a certain extent, these algorithms cannot effectively deal with the noise introduced in the communication system, thus limiting the further reduction of the bit error rate

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