A Construction Method of Optical Orthogonal Codes with Autocorrelation and Cross-correlation Constrained to 2

Abstract

The invention discloses a construction method for an optical orthogonal code with autocorrelation and cross-correlation constraint of 2. The method comprises the following steps of building an integerpair table N according to codeword quantity n and code weight w needing to be constructed; constructing an optical orthogonal code codeword marking difference distance triangular matrix D and a difference distance pair set T with the correlation and cross-correlation constraint of 2 according to a preset fetching rule; and constructing optical orthogonal code codewords with the autocorrelation and cross-correlation constraint of 2 according to a mapping relation formed by the marking difference distance triangular matrix D. Through constructing the integer pair table N and fetching from the table according to a preset fetching rule, and constructing the marking difference distance triangular matrix D and the difference distance pair set T meeting the requirement that all difference distance pair elements can not be appeared repeatedly, so that the optical orthogonal code codewords with the autocorrelation and cross-correlation constraint of 2 can be effectively constructed; the constructed codewords are large in quantity and high in code weight values; and the any quantity of optical orthogonal code codewords with the autocorrelation and cross-correlation constraint of 2 and withany code weight can be constructed.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for constructing an optical orthogonal code whose autocorrelation and mutual correlation are constrained to be 2. Background technique [0002] With the development of communication technology and the improvement of science and technology, people have more and more demands for communication services. In addition to ordinary telecommunication services, broadband services such as high-definition television and video on demand also have great demand. All of the above services require A broadband, real-time, multi-service website. Optical code division multiple access technology has asynchronous access, can make full use of the bandwidth of optical fiber, simple protocol, supports a large number of users to use different rates and can guarantee the quality of service (Quality of Service, QoS), no matter in the backbone network or in the so-called " The first kilomete...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a kind of autocorrelation and cross-correlation for the defect that related technologies cannot realize the construction of optical orthogonal codes with arbitrary number and arbitrary code weight autocorrelation and cross-correlation constrained to 2, which is not practical. Construction Method of Optical Orthogonal Codes Constrained to 2

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