Construction method for optical orthogonal signature graph codes with autocorrelation constraint of 1 and autocorrelation constraint of 2

Abstract

The invention discloses a construction method for optical orthogonal signature graph codes with the autocorrelation constraint of 1 and the autocorrelation constraint of 2. The construction method comprises the following steps that a two-dimensional integer pair table M is constructed; n integer pair tables N1, N2,..., Nn are constructed according to the code number and the code weight, numbers are fetched from the integer pair tables Ni (i=1, 2,..., n) according to a preset number fetching rule, and mark two-dimensional gap triangular matrixes Di (i=1, 2,...,) and two-dimensional gap pair sets i (i=1, 2,...,) corresponding to the optical orthogonal signature graph codes with the autocorrelation constraint of 1 and the autocorrelation constraint of 2 are constructed according to the two-dimensional integer pair tables; and according to the mapping relation formed by the mark two-dimensional gap triangular matrixes Di (i=1, 2,...), the optical orthogonal signature graph codes with the autocorrelation constraint of 1 and the autocorrelation constraint of 2 are constructed. According to the method, a large number of high-weight optical orthogonal signature graph codes with the autocorrelation constraint of 1 and the autocorrelation constraint of 2 can be effectively constructed, and any number of any-weight optical orthogonal signature graph codes with the autocorrelation constraint of 1 and the autocorrelation constraint of 2 are constructed.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for constructing an optical orthogonal signature pattern code with an autocorrelation constraint of 1 and a mutual correlation constraint of 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 infor...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that, under the same code length in the prior art, the optical orthogonal signature pattern code whose autocorrelation constraint is 1 and cross-correlation constraint is 2 is compared with the optical orthogonal signature pattern code word with strict correlation constraint Due to the fact that the number is large and the construction method is difficult, the current correlation construction method cannot be extended to construct an optical orthogonal signature pattern code with an autocorrelation constraint of 1 and a cross-correlation constraint of 2 for any code weight and number of codewords. The construction method does not have For the problem of practicability, provide a method for constructing an optical orthogonal signature pattern code with an autocorrelation constraint of 1 and a cross-correlation constraint of 2

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