Comprehensive Adaptive Transmission Method for Visible Light Communication
A technology of adaptive transmission and visible light communication, applied in the field of visible light communication, can solve the problems of insufficient transmission efficiency and insufficient flexibility of visible light OFDM system, and achieve the effect of improving the data transmission rate
Inactive Publication Date: 2019-11-05
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
[0004] The purpose of the present invention is to solve the technical problems of insufficient flexibility and insufficient transmission efficiency of the current visible light OFDM system
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[0017] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of th...
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The invention provides a comprehensive adaptive transmission method of visible light communication. The method comprises the following steps of interpolating a pivot signal into N subcarriers which are separated from one another by a specific frequency at the transmitting end, and performing first-time visible light signal transmission, wherein the N subcarriers are divided into m sub-bands, the number of the subcarriers included in each sub-band is N / m, and N belongs to a set of (64,128,256); receiving and demodulating the optical signal for obtaining the pivot signal; performing channel estimation according to the pivot signal, and determining the number N' of subcarriers in transmission and the modulation mode of a p-th sub-band in next-time transmission, wherein p belongs to a set of (1,2,...,m). According to the comprehensive adaptive transmission method of visible light communication, the number of subcarriers of the system and modulation mode can be flexibly adjusted, and data transmission rate is remarkably improved.
Description
technical field [0001] The present invention relates to visible light communication, in particular to a comprehensive adaptive transmission method and system for OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) visible light communication. Background technique [0002] Communication with white LED light sources for indoor lighting is a promising emerging technology. OFDM is a multi-carrier modulation technology in the field of communication. The spectrum of the subcarriers on the mutually orthogonal subchannels of the OFDM system allows overlapping, which has higher spectrum utilization than traditional frequency division multiplexing (FDM) rate, and it can effectively counter the frequency selectivity of the channel. However, due to the difference in frequency selectivity between each channel, it is necessary to introduce adaptive technology into the OFDM visible light communication system. The adaptive method of the general OF...
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IPC IPC(8): H04L27/26H04B10/116
CPCH04B10/116H04L27/2627H04L27/2697
Inventor 蔡彦博刘羿辰吴航张斯琪梁逸曦张准
Owner SOUTH CHINA NORMAL UNIVERSITY