Optical probability shaping method based on diamond modulation and symbol level partial marking mode

A symbol-level, diamond-shaped technology, applied in the field of optical transmission, can solve the problems of increasing transmission power redundancy, excessive space gap, limiting system performance, etc., to reduce the system bit error rate, improve the channel capacity value, and improve the energy concentration. Effect

Active Publication Date: 2018-12-11
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

The space utilization rate of the conventional constellation diagram is low, and the space gap is too large under the same Euclidean distance, which will limit the system performance, increase the transmission power redundancy, and reduce the transmission rate and channel capacity

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  • Optical probability shaping method based on diamond modulation and symbol level partial marking mode
  • Optical probability shaping method based on diamond modulation and symbol level partial marking mode
  • Optical probability shaping method based on diamond modulation and symbol level partial marking mode

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Embodiment Construction

[0028] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] see figure 1 , figure 2 and Figure 7 , the present invention proposes an improved design method for 2-dimensional QAM signal constellation, and combines it with the proposed symbol-level probability shaping method. The improvement method of the constellation map is based on the principle of the same minimum Euclidean distance in the central area, and the constellation points in the border area are relatively sparse; the probability shaping method is realized by mapping 16 constellation points to 9 constellation points to reduce the occurrence probability of constellation points in the edge area.

[0030] The main part of the invention is a symbol-level probability distribution matcher and a QAM signal constellation mapping method. The function of the symbol-level probability distribution matcher is to class-encode any input signal, ...

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Abstract

The invention discloses an optical probability shaping method based on diamond modulation and symbol level partial marking mode. Under the condition of satisfying minimum Euclidean distance, the spatial advantage of the constellation map is achieved, and the diamond QAM constellation map is proposed. At the same time, by combining with the proposed symbol-level probability shaping method, the distribution probability of low energy points of the input signal is improved and the transmission performance of the system is improved by increasing redundancy. The combination of symbol level probability shaping and diamond constellation mapping makes up for the shortcomings of single shaping or mapping, and has a significant contribution to the reduction of BER. Although the use of probability shaping increases the redundancy of information, but compared with the reduction of bit error rate, it has certain advantages and application prospects.

Description

technical field [0001] The invention belongs to the technical field of optical transmission, and in particular relates to an optical probability shaping method based on rhombic modulation and symbol-level partial marking. Background technique [0002] In today's society, the Internet, Internet TV, real-time video communication, and online shopping are developing rapidly. The data volume and communication bandwidth of the network are increasing exponentially. The optical access network known as the "last mile" is decisive for the improvement of communication transmission capabilities. role. In order to improve the processing capability and system performance of the optical access network, the optical access network should meet the characteristics of easy identification of modulation signals and simple and efficient network structure. On this basis, with the vigorous development of phase-shift keying modulation (PSK), quadrature amplitude modulation (QAM), discrete multi-tone...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/34
CPCH04L27/0008H04L27/3411
Inventor 刘博张丽佳毛雅亚吴翔宇忻向军孙婷婷赵立龙吴泳锋刘少鹏宋真真王俊锋哈特姜蕾
Owner NANJING UNIV OF INFORMATION SCI & TECH
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