Construction Method of Optical Orthogonal Signature Graphic Code with Autocorrelation Constraint 2 and Cross Correlation Constraint 1

Abstract

The invention discloses a construction method of an optical orthogonal signature graphic code with autocorrelation constraint of 2 and cross-correlation constraint of 1, the method comprises the following steps: S1, according to the number of code words and code weight of the optical orthogonal signature graphic code with autocorrelation constraint of 2 and cross-correlation constraint of 1, constructing an integer pair table N; S2, fetching numbers from the integer pair table according to a preset number fetching rule, constructing a code word mark two-dimensional differential distance triangular array i (i = 1, 2, ...,) and a two-dimensional differential distance pair set i (i=1, 2, ..., n) of the optical orthogonal signature graphic code with autocorrelation constraint of 2 and cross-correlation constraint of 1; S3, according to a mapping relation formed by a mark two-dimensional differential distance triangular array i (i = 1, 2, ..., n), constructing the optical orthogonal signature graphic code with autocorrelation constraint of 2 and cross-correlation constraint of 1. The optical orthogonal signature graphic code constructed by the method of the invention can be used as an address code of a parallel optical code division multiple access image transmission system, and can be widely used in an optical access network, a passive optical network, an optical code label switching network, an optical fiber sensor network, an optical core router and the like, which need to transmit images.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method for constructing an optical orthogonal signature graphic code with an autocorrelation constraint of 2 and a cross-correlation constraint of 1. Background technique [0002] Optical code-division multiple access (optical code-division multiple access, OCDMA) technology is the application of code-division multiple access technology in optical fiber communication. It adopts optical processing, allows multiple users to share the same channel, and has the advantages of fast processing speed, flexible access, no need to switch, arbitrary site selection, and full utilization of optical fiber bandwidth resources. Today, with the continuous growth of communication services, it has broad application prospects in accessing the network and increasing the capacity of the existing communication network. [0003] Although optical code division multiple access can make...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that, for the same code length, the optical orthogonal signature pattern code with an autocorrelation constraint of 2 has a larger number of codewords and more difficult construction methods than the optical orthogonal signature pattern code with strict correlation constraints. At present, the correlation construction method cannot be extended to construct an optical orthogonal signature pattern code with an autocorrelation constraint of 2 for any code weight and number of codewords. The construction method does not have practical defects. A kind of autocorrelation constraint of 2 and cross-correlation constraints is provided. Construction Method of Optical Orthogonal Signature Pattern Code of 1

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