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Generating method of visible light communication complementing code and visible light communication method based on complementing code

A visible light communication and complementary code technology, which is applied in multiplex code generation, multiplex communication, code division multiplexing systems, etc., can solve the problem that the optical communication address code and the electrical communication address code cannot be directly related to the application of visible light. Communication and other issues, to achieve the effect of great theoretical value and use value, and solve limitations

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem that traditional optical communication address codes and electrical communication address codes cannot be directly applied to visible light communication with an ideal correlation, thereby providing a method for generating a complementary code for visible light communication and a method for visible light communication based on the complementary code

Method used

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  • Generating method of visible light communication complementing code and visible light communication method based on complementing code
  • Generating method of visible light communication complementing code and visible light communication method based on complementing code
  • Generating method of visible light communication complementing code and visible light communication method based on complementing code

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination figure 2 Describe this specific embodiment, the generation method of visible light communication complementary code, it comprises the following steps:

[0044] Step 1. Express the VLC complementary code as: Φ(N,W M ,M,λ a ,λ c );,

[0045] In the formula: N is the subcode length; W M is the weight of the code group, that is, the number of M subcodes in the code group containing 1, w M =M; M is the number of subcodes in the code group; λ a is the lower bound of the sidelobe of the autocorrelation; λ c is the interference lower bound of the cross-correlation;

[0046] Step 2. Set the encoding conditions of the VLC complementary code:

[0047] Autocorrelation requirements: the sum of the autocorrelation side lobes is 0;

[0048] Cross-correlation requirements: cross-correlation interference is 1;

[0049] Each subcode contains only one 1;

[0050] The limit on the number of subcodes is: 2≤M≤N;

[0051] In any two use...

specific Embodiment approach 2

[0127] Specific implementation mode 2. A visible light communication method using the visible light communication complementary code generated in claim 1, characterized in that:

[0128] Signal transmission method:

[0129] Step A1, performing channel coding on the original information sequence to obtain coded data;

[0130] Step A2, optically modulating the coded data obtained in step 1 to obtain modulated data;

[0131] Step A3, using VLC complementary codes to perform VLC-CDMA encoding on the modulated data obtained in step 2, to obtain encoded data;

[0132] Step A4, transmitting the coded data obtained in step A3 to the channel in the form of visible light;

[0133] Signal receiving method:

[0134] Step A5, using a photodetector to receive the visible light emitted in step A4, and convert it into received data;

[0135] Step A6: VLC-CDMA decoding is performed on the received data in step A5 by using the visible light communication complementary code to obtain decoded...

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Abstract

The invention provides a generating method of a visible light communication complementing code and a visible light communication method based on the complementing code, and relates to wireless communication field. The objective of the invention is to solve a problem of a failure to directly apply a traditional optical communication address code and a traditional electric communication address code into visible light communication via ideal correlation. According to the invention, coding restriction conditions of the visible light communication complementing code are given out and then coding design is carried out based on the conditions. When the sub-code length is a prime number, a position of 1 in the sub-code is generated by means of a mode based on the Galois field. When the sub-code length is a non prime number, the visible light communication complementing code is generated by means of code block searching. According to the invention, by use of multiple sub-codes, the generated visible light communication complementing code has the advantage of correlation in electric communications, and limitations in peak detection and interference compromising of address codes used in current optical communications are removed.

Description

technical field [0001] The invention relates to the field of wireless communication. Background technique [0002] Visible light communication (VisibleLight Communications, VLC) is an emerging technology that combines communication and lighting functions, and has become a research hotspot in the field of wireless communication. Visible light communication is an emerging technology, and many key technologies are still being researched and explored. Inspired by optical fiber communication, consider applying CDMA technology to visible light communication system. [0003] Visible light communication CDMA (VLC-CDMA) system can ensure that several transmitters transmit data at the same time, enabling multiple users to access the network at the same time. CDMA itself has the advantages of a spread spectrum system, and has the advantages of anti-narrowband interference, anti-multipath fading, high security and security, high frequency reuse coefficient, and trade-offs between capa...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04J13/14H04B10/116
CPCH04B10/116H04J13/0011H04J13/14
Inventor 陈晓华邱杨孟维晓林玉信
Owner HARBIN INST OF TECH
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