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Method for determining average channel capacity of underwater optical communication system based on partially coherent light

An optical communication system and channel capacity technology, applied in the field of communication, can solve the problems of reducing the scintillation index of fully coherent Gaussian beams, affecting the improvement of channel capacity of underwater wireless optical communication systems, and not outstanding performance.

Active Publication Date: 2019-02-12
XIDIAN UNIV
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Problems solved by technology

[0004] At present, the underwater channel capacity is mostly determined by establishing an underwater wireless optical communication UOWC system, considering the absorption scattering effect or turbulence effect in the underwater channel, and using the Shannon formula to study the channel capacity of different types of light passing through the UOWC system. The channel capacity research of coherent Gaussian beams in underwater is relatively complete, but the performance of fully coherent Gaussian beams in reducing scintillation index is not outstanding, which affects the improvement of channel capacity of underwater wireless optical communication systems

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  • Method for determining average channel capacity of underwater optical communication system based on partially coherent light
  • Method for determining average channel capacity of underwater optical communication system based on partially coherent light
  • Method for determining average channel capacity of underwater optical communication system based on partially coherent light

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[0043] 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.

[0044] refer to figure 1, the implementation steps of the present invention are as follows:

[0045] Step 1. Based on IM / DD detection and NRZ-OOK modulation, a SISO-UOWC system is established to obtain the average signal-to-noise ratio expression.

[0046] 1a) At the transmitter, the on-off keyed OOK binary data stream first passes through a pulse shaping filter to limit the transmission signal bandwidth and reduce the probability of receiving errors; then the binary electrical signal is modulated onto a collimated Gaussian beam in the fundamental mode state by a laser ; Then use the phase shifter to maintain t...

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Abstract

The invention discloses a method for determining an average channel capacity of an underwater optical communication system based on partially coherent light, which mainly solves the problem that the prior art does not involve the flicker index and the average channel capacity of a partially coherent Gaussian beam in the ocean. The scheme comprises the following steps: establishing an SISO-UWOC system to obtain an average signal-to-noise ratio (SNR); obtaining a scintillation index expression (FORMULA referred) of the partially coherent Gaussian beam under the weak ocean turbulence by using theGaussian model, the refractive index structure constant and the scintillation index expression, and establishing a joint channel model to obtain a probability density function fh(h) of a joint channel attenuation factor; and bringing expressions of the (SNR), ((FORMULA referred) and fh(h) into the existing average channel capacity expression to determine an average channel capacity of the SISO-UWOC system. The method provided by the invention can determine the average channel capacity of the SISO-UWOC system by obtaining the scintillation index ((FORMULA referred) of the partially coherent Gaussian beam under the weak ocean turbulence, which can be used for a single-input single-output underwater wireless optical communication system.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a method for determining average channel capacity, which can be used in single-input and single-output underwater wireless optical communication systems. Background technique [0002] In recent years, the important position of underwater wireless optical communication UOWC in military, industrial and scientific research has received more and more attention. Compared with traditional underwater sound communication, underwater wireless optical communication has three advantages: low latency, high bandwidth and better security. It is precisely because of these three advantages that underwater wireless optical communication plays an important role in the fields of underwater surveying, underwater sensor networks, underwater archaeology, navigation, maintenance and control of underwater oil infrastructure, etc. A lot of research work has been devoted to the development of highe...

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Application Information

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IPC IPC(8): H04B17/391H04B17/336H04B13/02H04B10/516
CPCH04B10/516H04B10/5167H04B13/02H04B17/336H04B17/3912
Inventor 邹正兴王平庞维娜李昂陈雯雯
Owner XIDIAN UNIV
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