Multidimensional Coding Methods in Visible Light Communication
A technology of visible light communication and multi-dimensional coding, applied in the direction of free space transmission, short-distance systems, etc., can solve the problems of increasing implementation complexity, achieve the effect of improving resource utilization efficiency, reducing transmission and detection overhead, and reducing redundancy
Active Publication Date: 2016-01-20
XIAN UNIV OF TECH
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Problems solved by technology
These encoding methods often simplify the implementation, but at the expense of frequency resources; or can effectively use spectrum resources, but increase the complexity of implementation; this is a new energy-saving communication method that mainly uses visible light LEDs to achieve both lighting and communication. is not advisable
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[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] The multi-dimensional encoding method in visible light communication of the present invention specifically includes the following steps:
[0019] 1. Modulate each LED with a 41-bit Gothic code to generate a corresponding optical signal to form the frame header of each frame signal.
[0020] 2. Group a series of code streams, and uniquely map the code words in each group into a PPM code. Among them, the number of groups is determined by the number of LED primary colors;
[0021] 3. Load the above-mentioned PPM coded signal to the single-color LED through the LED driver, so that it can generate a corresponding single-color LED light signal according to the PPM electrical signal;
[0022] 4. Multiple primary color LEDs complete the process described in 2 at the same time, and finally form a multi-dimensional coded visible light pattern ...
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The multi-dimensional encoding method in visible light communication includes multiple LEDs, and modulates each LED with a 41-bit Gothic code to generate a corresponding optical signal to form a synchronous subframe of multi-dimensional encoding in visible light communication; group a series of code streams , the codeword in each group is uniquely mapped into a PPM coded signal; the number of groups is determined by the number of LED primary colors; The encoded signal generates a corresponding monochromatic LED light signal. The present invention utilizes three primary colors such as red, green, and blue or other multi-primary LED lights, and adopts a pulse position modulation method to generate multi-dimensional encoded visible light signals. The basic code pattern of the multi-dimensional code formed by the pattern improves the channel utilization ratio of a spectrum and is simple to implement.
Description
technical field [0001] The invention belongs to the technical field of communication methods, and relates to a multi-dimensional encoding method in visible light communication. Background technique [0002] Visible light communication is a communication method that uses light-emitting diodes (LEDs) to transmit information by generating high-speed bright and dark flickering signals that are difficult for the human eye to detect while providing illumination. It essentially belongs to the category of wireless optical communication. Therefore, in addition to the advantages of general wireless optical communication, it also has the advantages of no need for spectrum certification, safety for people, and green energy saving. [0003] Most of the current research on visible light communication adopts OOK or VPPM modulation, combined with RZ code or NRZ code to directly modulate the intensity of white LEDs for signal transmission. Such an approach is easy to implement, but the util...
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IPC IPC(8): H04B10/116
Inventor 柯熙政亢烨
Owner XIAN UNIV OF TECH