Optical orthogonal signature graphic code construction method with autocorrelation and cross-correlation constraint being 2

Abstract

The present invention discloses an optical orthogonal signature graphic code construction method with autocorrelation and a cross-correlation constraint being 2. The method comprises the steps of: constructing an integer pair table N according to the number of code words of the optical orthogonal signature graphic codes with autocorrelation and cross-correlation constraint being 2 required being constructed and the code weight, and constructing a two-dimensional integer pair table M according to a preset construction rule; fetching numbers according to the two-dimensional integer pair table Mand a preset number fetching rule, constructing a marking two-dimensional difference distance triangular matrix i(=1, 2, ...,n) and a two-dimensional difference distance pair set i(i=1, 2, ...,) of the optical orthogonal signature graphic code words with autocorrelation and a cross-correlation constraint being 2; and constructing the optical orthogonal signature graphic code with autocorrelation and a cross-correlation constraint being 2 according to a mapping relation formed by the marking two-dimensional difference distance triangular matrix i(=1, 2, ...,n). The method is employed to construct the optical orthogonal signature graphic code words with autocorrelation and a cross-correlation constraint being 2 and with any code weight and any quantity, the construction time only needs tensof milliseconds, and the method is simple, practical and feasible.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for constructing an optical orthogonal signature pattern code whose autocorrelation and mutual correlation are constrained to be 2. Background technique [0002] Optical code-division multiple access (OCDMA) technology is the application of code-division multiple access technology in optical fiber communication. It adopts optical processing and allows multiple users to share the same channel. It has the advantages of fast processing speed, flexible access, no need for switching, arbitrary address selection, and full use of optical fiber bandwidth resources. Today, with the continuous growth of communication services, it has broad application prospects in access networks and increasing the capacity of existing communication networks. [0003] Although optical code division multiple access can make full use of the bandwidth resources of optical fibers, when the inf...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that, under the same code length, the optical orthogonal signature pattern code whose autocorrelation and cross-correlation constraints are 2 has more code words than the optical orthogonal signature pattern code with strict correlation constraints, and the construction method Difficult situation, the current correlation construction method can not be extended to the construction of any code weight and code word number autocorrelation and cross-correlation constraints of 2 optical orthogonal signature pattern code, the problem that the construction method is not practical, to provide a self- Construction Method of Optical Orthogonal Signature Graphical Codes with Correlation and Cross-correlation Constraints of 2

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