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Method for modulating polarization differential pulse position

A modulation method and differential pulse technology, which can be used in electrical components, transmission systems, etc., to solve the problems of insufficient bandwidth utilization, unsuitable underwater mass data transmission, and high bit error rate.

Active Publication Date: 2012-09-12
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

However, the DPPM modulation method will still generate too many redundant "0" time slots during the encoding process, so that its bandwidth utilization rate is still not high enough. In the case of ensuring the transmission distance, the bit error rate is too high, which is not suitable for Underwater massive data transmission

Method used

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  • Method for modulating polarization differential pulse position
  • Method for modulating polarization differential pulse position
  • Method for modulating polarization differential pulse position

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Embodiment Construction

[0026] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0027] The present invention mainly optimizes the symbol structure of the DPPM modulation mode, and introduces light pulses of different polarization directions into the symbols, thereby forming a signal composed of an initial pulse and no continuous "0" time slots. The specific method is as follows "

[0028] The polarization differential pulse position modulation method introduces light pulses with different polarization directions in the coding symbols to represent the initial pulse, using N ( N ≥2, preferably 2 or a multiple of 2) light pulses with different polarization directions to represent different information, which includes the following steps:

[0029] A. Segment raw data into M an ordered sequence of groups of bit binary data;

[0030] B. For each group M bit binary data, write it as , and define ;

[00...

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Abstract

The invention discloses a method for modulating a polarization differential pulse position, and relates to a communication method for underwater wireless optical communication. A symbolic structure with a differential pulse-position modulation (DPPM) mode is optimized by the method for modulating the polarization differential pulse position, and optical pulses with different polarization directions are led into a symbol so as to form a signal composed of an initial pulse and a continuous '0' time slot without transmitting any pulse. The communication method adopts the manner of modulating the polarization differential pulse position.

Description

technical field [0001] The present invention relates to the field of wireless optical communication, especially the field of underwater wireless optical communication, and specifically proposes a polarization differential pulse position modulation method to improve the bandwidth utilization rate and communication distance of optical communication, so as to improve the communication performance of optical communication and expand device application scenarios. Background technique [0002] In the past decade, optical component technology has developed quite maturely and has high ubiquity, so improving the performance of underwater wireless optical communication by improving existing optical devices will bring considerable cost. In this context, it has become a viable option to reduce system complexity and overall cost by processing optical signals. The communication performance of the underwater optical communication system can be improved as much as possible without sacrific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B14/06
Inventor 董宇涵张学聃王众孟建林孝康
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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