A method for blind detection receiver of wireless optical communication
A wireless optical communication and receiver technology, applied in the field of wireless optical communication, can solve the problems of bit error rate reduction, no communication system processing, etc., and achieve the effect of reducing impact, good noise performance, and good bit error rate performance
Inactive Publication Date: 2018-10-19
PEKING UNIV
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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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[0030] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.
[0031] The present invention provides a method for wireless optical communication blind detection receiver, aiming at the wireless optical communication system, combining the advantages of blind detection algorithm and denoising algorithm, effectively extracting the signal from the light wave affected by the atmospheric channel and making a judgment; at the same time , using the time correlation of the atmospheric channel, the detection and decision can be realized in the case of unknown channel information. Therefore, compared with the traditional wireless optical communication detection algorithm, the present invention can suppress the noise introduced in the signal transmission process to a large extent, has better bit error rate performance, and can realize blind detection under unknown channel st...
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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...
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IPC IPC(8): H04B10/67H04B17/29H04B17/327H04B10/079
CPCH04B10/07953H04B10/67H04B17/29H04B17/327
Inventor 党安红李锐杰
Owner PEKING UNIV