Calculation method of symbol error rate for hard demodulation of mppm-fso system based on ew composite channel model

A technology of MPPM-FSO and composite channel, which is applied in baseband system components, transmission system, synchronization/start-stop system, etc., can solve the problem of no consideration of point error, few reports on hard demodulation characteristics, and cannot be used to guide FSO communication system Receiver design and other issues to achieve the effect of low complexity

Active Publication Date: 2019-06-11
XIDIAN UNIV
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Problems solved by technology

[0005] The current problem is that due to the complexity of MPPM, there are few reports about its hard demodulation characteristics
At present, most of the known hard demodulation system algorithms only consider the effect of atmospheric turbulence, but do not consider the influence of point errors
Therefore, it cannot be used to guide the actual FSO communication system receiver design

Method used

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  • Calculation method of symbol error rate for hard demodulation of mppm-fso system based on ew composite channel model
  • Calculation method of symbol error rate for hard demodulation of mppm-fso system based on ew composite channel model
  • Calculation method of symbol error rate for hard demodulation of mppm-fso system based on ew composite channel model

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[0031] 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.

[0032] The present invention is based on the MPPM modulation and adopts two kinds of decision threshold hard demodulation bit error rate calculation methods, including:

[0033] Step 1: Based on the exponential Weber EW distribution and considering the influence of point errors, a point-to-point free-space optical communication composite channel model is established

[0034] 1a) Let x be the sending signal sequence and y be the receiving signal sequence, then the mathematical model of the channel is:

[0035] y=Rhx+n

[0036] Among them, n means that the mean is 0 and the variance is additive white Gaussian noi...

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Abstract

The invention discloses an MPPM-FSO system hard demodulation error symbol rate calculating method based on an EW composite channel model. The method comprises the steps that 1) based on EW distribution, a point-to-point free space optical communication composite channel model is established by taking into account the influence of a point error; 2) the values of the optimal decision threshold and adynamic decision threshold are determined according to the cumulative distribution model and probability distribution model of an EW turbulence and point error composite channel model; 3) the probability of wrong decision for each time slot subject to the interference of an EW turbulence and point error complex channel is calculated; and 4) the Gaussian Laguerre polynomials are used to acquire the closed expression of the error symbol rate. According to the invention, compared with a single atmospheric turbulence model, the composite channel model in the method takes into account the influence of the point error on the system performance; and the method has low complexity, is better than other hard demodulation algorithms in the aspect of the error symbol rate system performance, and ismore in line with the actual situation.

Description

technical field [0001] The invention relates to a (N, M) MPPM modulation method in a wireless optical communication system, which is based on an exponential Weibull distribution and adopts an optimal decision threshold and a dynamic decision threshold hard demodulation calculation method under the consideration of the influence of point errors, belonging to wireless optical communication technology field. Background technique [0002] Wireless optical communication is often called free space optical communication (Free space optical communication), that is, FSO communication. FSO communication is a new type of broadband wireless communication method that uses light waves as a carrier to transmit communication information in a free space transmission medium. It has low cost, flexible and convenient erection, strong anti-electromagnetic interference ability, good confidentiality, and no frequency resource license. , frequency bandwidth and other advantages, has been widely co...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04B17/336H04B17/391H04L25/06H04L25/49
Inventor 秦亦灵王平王坤刘晓霞傅慧华
Owner XIDIAN UNIV
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