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Construction method of two-dimensional optical address codes suitable for visible light OCDMA (Optical Code Division Multiple Access) communication

A construction method and optical address technology, applied in the field of communication, can solve the problems such as the difficulty of having both large code sets and low cross-correlation values, and the limited selection of wave numbers, so as to improve the performance of codewords, improve the communication quality, and improve the degree of freedom. Effect

Active Publication Date: 2017-06-30
XIDIAN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art above, and propose a method for constructing a two-dimensional optical address code suitable for visible light OCDMA communication, which is used to solve the problems in the construction method of the existing two-dimensional optical address code for visible light OCDMA communication. The existing wave number selection is limited and the technical problems of large code set and low cross-correlation value are difficult to achieve at the same time

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  • Construction method of two-dimensional optical address codes suitable for visible light OCDMA (Optical Code Division Multiple Access) communication
  • Construction method of two-dimensional optical address codes suitable for visible light OCDMA (Optical Code Division Multiple Access) communication
  • Construction method of two-dimensional optical address codes suitable for visible light OCDMA (Optical Code Division Multiple Access) communication

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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples.

[0026] refer to figure 1 , the present invention comprises the following steps:

[0027] Step 1: Select (N, ω, λ from the one-dimensional optical address code a =1,λ c =1) Optical Orthogonal Code OOC, where N is the code length, ω is the code weight, and λ a is the maximum autocorrelation sidelobe, λ c is the maximum cross-correlation value;

[0028] The (40,4,1,1) optical orthogonal code OOC is selected from the one-dimensional optical address code as the time-domain spread spectrum code, and its code set is 3. Take one of the code words (1100100000000100000000000000000000000000) as an example (abbreviated as 11001000000001).

[0029] Step 2: In the prime field Z P =Select an irreducible n-order polynomial q(x) on {0,1,2,...,P-1}, where P is a prime number and n is any positive integer;

[0030] Pick one in the prime field Z 2 = irreduc...

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Abstract

The invention provides a construction method of two-dimensional optical address codes suitable for visible light OCDMA (Optical Code Division Multiple Access) communication, and aims to solve the technical problems of limitation on wave number selection and difficulty in gaining both a large code set and a low cross-correlation value in the prior art. The method comprises the following implementation steps: generating a galois field according to an irreducible polynomial on a prime field; generating a mapping sequence according to a quadratic polynomial on the galois field; mapping a corresponding wavelength onto pulses of one-dimensional optical address codes according to the mapping sequence to obtain two-dimensional optical address codes; and grouping the two-dimensional optical address codes, and allocating a group of code words to each LEDs (Light Emitting Diodes) communication terminal in the visible light communication. In the construction method, the mapping sequence is generated through the quadratic polynomial on the galois field, so that selection of a two-dimensional optical address code wave number is more flexible. Moreover, the two-dimensional optical address codes are grouped, so that a visible light communication network can accommodate more users, and multi-user interference under the coverage of the same LEDs illuminating communication terminal is restrained.

Description

technical field [0001] The invention belongs to the field of communication technology, and in particular relates to a method for constructing a two-dimensional optical address code in a visible light optical code division multiple access communication system, which can be used for visible light communication with high requirements for multi-user random access, anti-interference and system capacity middle. Background technique [0002] Visible Light Communication (VLC) technology based on LEDs lighting can provide communication while lighting. Compared with other indoor wireless communication methods, VLC has the characteristics of large capacity, no spectrum application, anti-electromagnetic interference, high security, low cost, and environmental protection, making it suitable for more indoor environments. For example, in environments where electromagnetic waves are prohibited, such as hospitals and airplanes, electromagnetic waves will interfere with the normal use of ins...

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Application Information

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IPC IPC(8): H04B10/116H04J14/02H04J11/00
CPCH04B10/116H04J11/0026H04J14/0223H04J14/0238
Inventor 万和平尚韬高妍杨银堂
Owner XIDIAN UNIV
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