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Index Weber and APD based error rate calculating method of PPM wireless optical communication system

A technology of wireless optical communication and calculation method, which is applied in the field of wireless optical communication, can solve problems such as bit error rate analysis of FSO systems that are rarely studied, and achieve good applicability and improve the effect of bit error rate performance

Active Publication Date: 2017-05-17
XIDIAN UNIV
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Problems solved by technology

[0005] The current problem is that due to the complexity of the signal data model detected by the APD, few studies involve the bit error rate analysis of the FSO system under the influence of turbulence

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  • Index Weber and APD based error rate calculating method of PPM wireless optical communication system
  • Index Weber and APD based error rate calculating method of PPM wireless optical communication system
  • Index Weber and APD based error rate calculating method of PPM wireless optical communication system

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the following will further describe in detail in conjunction with the accompanying drawings and specific embodiments. This embodiment only shows the principle description of the present invention, and does not represent any limitation to the present invention.

[0024] Step 1 Establish the mathematical model of the atmospheric channel of point-to-point wireless optical communication

[0025] 1a), first establish as figure 1 The mathematical model of the atmospheric channel is shown, and the noise characteristics such as atmospheric turbulence that cause signal interference are analyzed. Let x be the sending signal sequence and y be the receiving signal sequence, then the mathematical model of the channel is:

[0026] y=hx+n

[0027] n means that the mean is 0 and the variance is additive white Gaussian noise. h is the channel fading that obeys the EW distribution. ...

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Abstract

The invention discloses an index Weber and APD based error code calculating method of a PPM wireless optical communication system. The method comprises that 1) an atmospheric channel mathematical model of free space optical communication is established; 2) an accurate statistical model in which an APD outputs the electron number is used to calculate a probability density function and an accumulative distribution function of the electron number output by the APD when each time slot of a PPM signal has light pulses; 3) according to the a conditioned error code formula and an equivalent signal to noise ratio formula of the free space optical communication, and a theoretical average error rate of the system in an index Weber fading channel is calculated; and 4) a Hermite polynomial is used for simplification to obtain average error rate formulas in the BPPM system and an M element pulse position modulated MPPM system. According to the method, each time slot of a PPM block is detected in the reception end, the complexity degree is reduced, and the performance of the error rate system is higher than that of a PIN algorithm or other turbulent flow models.

Description

technical field [0001] The invention relates to a bit error rate calculation method of a PPM wireless optical communication system based on exponential Weber and APD in a wireless optical communication system, and belongs to the technical field of wireless optical communication. Background technique [0002] Free-space optical communication (free-space optical, FSO) uses atmospheric channels as the transmission medium, and the turbulence caused by atmospheric inhomogeneity will lead to random fluctuations in the optical refractive index, resulting in light intensity flicker, beam drift and Beam expansion and other effects will cause channel fading, resulting in a decrease in the quality of the transmitted beam and an increase in the communication bit error rate, seriously affecting the stability and reliability of the system. In order to better study the influence of the atmospheric channel on the FSO system, researchers have successively proposed different atmospheric chann...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079
CPCH04B10/07953
Inventor 王平傅慧华刘洋王悦张艳郭立新
Owner XIDIAN UNIV
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