A visible light system multi-user communication method
A multi-user communication and visible light technology, applied in the field of multi-user communication of visible light system, can solve problems such as system performance degradation, achieve the effect of improving system performance and signal transmission rate
Active Publication Date: 2019-06-14
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a visible light system multi-user communication method to solve the problem existing in the prior art that the use of Orthogonal Frequency Division Multiple Access leads to system performance degradation
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[0042] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0043] The present invention provides a multi-user communication method of a visible light system aiming at the problem that the system performance is degraded by adopting OFDMA in the prior art.
[0044] Such as figure 1 As shown, the visible light system multi-user communication method provided by the embodiment of the present invention includes:
[0045] S101, at the sending end, obtain the Walsh (walsh) orthogonal code corresponding to each user;
[0046] S102. According to the obtained walsh orthogonal code corresponding to each user, use a mapping method to perform orthogonal encoding on each user signal, so that each user signal is respectively mapped to an orthogonally encoded sequence, wherein the user The signal is a signal to be encoded;
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The invention provides a multi-user communication method of a visible light system. The signal transmission rate can be improved. The method comprises the following steps: obtaining a Walsh orthogonal code corresponding to each user on a sending end; performing orthogonal encoding on each path of user signals according to the obtained Walsh orthogonal code corresponding to each user in a mapping manner, so that each path of user signals is separately mapped into a sequence after orthogonal encoding, wherein the user signals are to-be-encoded signals; superposing a plurality of sequences obtained mapping, and converting a parallel sequence obtained by the superposing into a serial signal, wherein the serial signal is transmitted to a receiving end through a visible light channel; and restoring each path of user signals through orthogonal decoding through the orthogonal encoding on the receiving end. The multi-user communication method disclosed by the invention is applicable to the technical field of visible light wireless communication.
Description
technical field [0001] The present invention relates to the technical field of visible light wireless communication, in particular to a visible light system multi-user communication method. Background technique [0002] With the development of the times, wireless communication technology and lighting technology have become more and more common in people's lives. Visible light LED wireless communication, as a new technology using white light LED for communication, has rich visible light resources, safety and energy saving, and large communication capacity. , High transmission frequency, fast transmission rate, no electromagnetic interference, no need for radio frequency certificates, etc. Visible light LED wireless communication has good application prospects and occupies an important position and value in the future communication field. Using LED as the light source for indoor visible light communication signals has energy-saving, intelligent, informatization, security, and ...
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IPC IPC(8): H04B10/116H04J13/00H04L1/00
CPCH04B10/116H04J13/0048H04L1/0056
Inventor 王建萍金建力陈丹阳
Owner UNIV OF SCI & TECH BEIJING