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Optical orthogonal code construction method

An optical orthogonal code and construction method technology, applied in the field of optical communication, can solve problems such as no effective method, and achieve the effects of wide application range, clear structure and high calculation efficiency

Active Publication Date: 2014-11-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

At present, the existing OOC design schemes in the industry usually use mathematical methods such as difference set, finite field, finite set, and combination design, but these methods are usually only applicable to specific v , k , , parameters, and there is currently no effective way to design an OOC with more codewords under general parameter settings

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Embodiment Construction

[0038] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0039] Aiming at the shortcoming of the existing optical orthogonal code construction technology that has a narrow application range, the present invention proposes a new optical orthogonal code construction method. For the OOC construction problem of any parameter, the method of the present invention can provide Optical Orthogonal Codes with Larger Codeword Capacity. The basic principle of the present invention is as figure 1 As shown, specifically: transform the construction problem of optical orthogonal code into the online maximum clique problem of graph, then solve the online maximum clique problem of graph, and finally transform the obtained maximum clique into optical orthogonal code.

[0040] For the four parameters of code length, weight, autocorrelation upper bound, and cross-correlation upper bound, respectively, v , k , , The optical ...

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Abstract

The invention discloses an optical orthogonal code construction method and belongs to the technical field of optical communication. The method comprises the following steps: converting a construction problem of an optical orthogonal code into an on-line maximum clique problem of a graph; then, solving the on-line maximum clique problem of the graph; finally, converting the obtained maximum clique into the optical orthogonal code. The method further solves the on-line maximum clique problem of the graph by utilizing an evolutionary algorithm based on the guidance variation. Compared with the prior art, the method is wider in application range, can be adopted to obtain optical orthogonal codes with larger codon capacity based on code length, code weight and random self-correlation and cross-correlation coefficients randomly set, is higher in algorithm efficiency and excellent in real-time performance.

Description

technical field [0001] The invention relates to a method for constructing an optical orthogonal code, belonging to the technical field of optical communication. Background technique [0002] Optical Code Division Multiple Access (OCDMA) is a new communication method that combines Code Division Multiple Access (CDMA) communication technology with optical fiber communication technology. OCDMA makes full use of the huge bandwidth resources of optical fiber, combined with the advantages of electrical CDMA, it has the characteristics of asynchronous, broadband, reliable and random access. In the OCDMA system, each user is assigned a unique optical address code with good correlation characteristics to identify and distinguish each other, so as to realize the random communication of the shared channel. Because the optical orthogonal code (OOC) has good autocorrelation and correlation characteristics, OOC is often used to realize the address code design of OCDMA. [0003] length i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/00H04J13/12
Inventor 彭茂张媛王廷春
Owner NANJING UNIV OF INFORMATION SCI & TECH
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