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A method for composing optimum optical orthogonal code

An optical orthogonal code, the best technology, is applied in the field of optical orthogonal code construction in optical fiber CDMA system, and can solve the problem that the optical orthogonal code construction method is not given.

Inactive Publication Date: 2006-12-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

As far as the existence of the code is concerned, Bose, Buratti and others have done a lot of research work in this area (see the document Marco Buratti.Constructions of(q, k, 1) difference families with q a prime power and k=4,5. Discrete Mathematics, 1995, (138): 169-175), and using combinatorial design and related theories of elementary number theory, it was proved that optical orthogonal codes whose code length satisfies certain conditions exist, but they did not give these optical orthogonal codes The specific construction method of cross code

Method used

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  • A method for composing optimum optical orthogonal code
  • A method for composing optimum optical orthogonal code
  • A method for composing optimum optical orthogonal code

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Embodiment Construction

[0037] In the actual optical CDMA system, the spreading gain of the spreading sequence (address code) is generally about 1000. Therefore, we only discussed the case where the code length v<1200. Of course, when the code length v≥1200, the construction method still apply.

[0038] Taking the construction of the optimal (661, 5, 1) optical orthogonal code as an example, how to obtain all its code words is illustrated. Based on attached image 3 In the data, when the code length v=661, code weight k=5, it can be seen that the number of codewords t=33, the original element α=2 of the finite field GF(541), the set B 0 The generator of all elements a=531=2 342 (mod 661), so that the B 0 {0, 531, 375, 164, 493}, using relation B i = 2 10i B 0 (1≤i≤33), 33 5-element sets can be obtained:

[0039] {0, 402, 620, 42, 489} {0, 506, 320, 43, 359} {0, 581, 485, 406, 100}

[0040] {0, 44, 229, 636, 606} {0, 108, 502, 179, 526} {0, 205, 451, 199, 570}

[0041] {0, 383, 446, 188, 17} ...

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Abstract

The invention provides a method for constructing optimum (v, k, 1) optical orthogonal code, which is an optimization spread-spectrum sequence for the optical fiber CDMA system, when the code length v is a prime number, some cycles differential set CDF (v, k, 1) can be obtained through computer-aided design, thus constructing a series of optimum (v, k, 1) optical orthogonal code. The method by the invention provides an effective approach for the optimum spread-spectrum sequence design in the optical fiber CDMA system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and particularly relates to a method for constructing optical orthogonal codes in an optical fiber CDMA system. Background technique [0002] Optical fiber CDMA is a new type of communication method that combines code division multiple access communication technology and optical fiber communication technology. It makes full use of the characteristics of the two communication methods and has strong technical advantages and broad application prospects (see literature Svetislav V. Maric, Oscar Moreno. Multimedia transmission in Fiber-Optic LAN's using optical CDMA. J. Lightwave Technol., 1996, 14(10): 2149-2153 and literature Jawad A. Salehi. Emerging optical code-division multiple access communications systems. IEEE Network , 1989, (3): 31-39). Optical fiber CDMA technology mainly uses a series of spread spectrum sequences (address codes) with good correlation characteristics t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/12H04J13/02H04J13/10
Inventor 邱昆安晓强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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