Method for calculating bit error rate (BER) of underwater wireless optical communication system based on parallel multi-hop architecture

Abstract

The invention discloses a method for calculating the bit error rate (BER) of an underwater wireless optical communication system based on parallel multi-hop architecture. The method comprises the following steps: establishing a transmission model suitable for a parallel multi-hop-underwater wireless optical communication system by adopting an optimal path selection scheme of a maximum and minimumcriterion based on LN ocean turbulence distribution under the consideration of the effect of path loss; deriving a system probability density function and a cumulative distribution function under thejoint action of LN turbulence and the path loss; obtaining a closed system BER expression with a Gauss Laguerre polynomial, and performing simulation verification by a Monte Carlo method; bringing different parameters into a closed average BER expression to obtain the influences of the parameters on system performance; and introducing LDPC coding to compare the influences of different structure parameters, bit rate and maximum iteration times and code length on the performance of the parallel multi-hop-UWOC system. The method effectively takes into account a plurality of factors affecting theperformance of the system, which conforms to the actual situation more.

Description

technical field The invention belongs to the technical field of underwater wireless optical communication, specifically, under the joint action of ocean turbulence and path loss, LDPC coding is introduced, and decoding and forwarding protocol (DF) and IM / DD detection are adopted to perform end-to-end ABER performance Theoretical and simulation studies of LN composite channel parallel multi-hop-UOWC system bit error rate calculation method. Background technique Underwater wireless optical communication (UWOC Underwater Wireless Optical Communication) is a new line-of-sight transmission communication technology that uses laser as the carrier and seawater as the transmission medium to achieve two-way communication. Due to its large transmission information capacity, wide communication frequency band, high transmission speed, strong anti-interference ability, high security, strong confidentiality and small size, it has attracted much attention. However, the performance of UOWC ...

AI Technical Summary

Problems solved by technology

The current problem is: the research on the bit error rate of the parallel multi-hop-UOWC system based on the LN composite turbulent channel model has not been reported; in addition, the analysis of the impact of LDPC coding on the performance of the parallel multi-hop system has not been reported.

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