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Long-distance high-speed visible light communication method based on polarization multiplexing

A visible light communication and polarization multiplexing technology, applied in the field of communication and indoor visible light communication systems, can solve the problems of complexity, high signal processing delay, low complexity of time domain coding method, and reduce the effective rate of the system. The effect of increasing the transmission distance, increasing the transmission distance, and improving the communication rate

Active Publication Date: 2015-12-16
暖屋信息科技(苏州)有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

For example, the iterative method can effectively suppress signal-signal beat frequency noise, but its complexity and signal processing delay are high
The time-domain coding method has lower complexity, but it requires a large overhead, which reduces the effective rate of the system

Method used

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  • Long-distance high-speed visible light communication method based on polarization multiplexing
  • Long-distance high-speed visible light communication method based on polarization multiplexing
  • Long-distance high-speed visible light communication method based on polarization multiplexing

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Embodiment 1

[0031] The method of the present invention mainly relates to the problem of transmitting and receiving of the visible light communication system. Combine below figure 1 , figure 2 and image 3 , the steps of a long-distance high-speed visible light communication based on polarization multiplexing in this embodiment are described in detail.

[0032] S101: The transmitter maps the information;

[0033] S102: Perform parallel-to-serial conversion on the mapped signal;

[0034] S103: Using IFFT (Inverse Fast Fourier Transform) to change the signal from the frequency domain to the time domain;

[0035] S104: adding a cyclic prefix, and performing a parallel-to-serial conversion on the signal to obtain a signal I1;

[0036] S105: Perform reverse coding on I1 to obtain coded signal I2;

[0037] The encoding process is described as follows:

[0038] Coded input X, coded output is Y, between X and Y satisfies: Y=-X.

[0039] S106: Transform I1 and I2 into two electrical signal...

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Abstract

The invention discloses a long-distance high-speed visible light communication method based on polarization multiplexing. The method comprises: firstly, reversely encoding a signal to be transmitted, then respectively loading a non-encoded electrical signal and an encoded electrical signal to two orthogonal polarization visible light carriers, simultaneously outputting two modulated light signals to the same free space through polarization multiplexing, adopting a polarizing element to carry out demultiplexing on the two paths of orthogonal light signals through a receiving end, detecting the two paths of signals by using a photoelectrically balanced detector, subtracting the two paths of signals to obtain decoded signals at last, and outputting the decoded signals. The method can be used for improving the signal to noise ratio of the received signal without reducing the communication rate of the system, so as to increase the transmission distance of the system. The method is low in signal processing complexity and is high in practicability. The method has an important application value on indoor visible light high-speed communication systems.

Description

technical field [0001] The invention belongs to the field of communication methods, and relates to an indoor visible light communication system, in particular to a long-distance high-speed visible light communication method based on polarization multiplexing. Background technique [0002] Visible light communication methods based on light-emitting diodes (LEDs) can simultaneously achieve energy-efficient lighting and high-speed wireless communication. Compared with the existing microwave wireless communication methods, LED visible light communication has the outstanding characteristics of no electromagnetic interference, no frequency authorization, and high physical isolation. Due to the small modulation bandwidth of LEDs, high-rate visible light communication systems need to use high-order modulation formats. However, high-order modulation formats have higher requirements on the receiving signal-to-noise ratio, which limits the transmission distance of the system. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04J14/06
Inventor 洪学智洪学敏刘智华
Owner 暖屋信息科技(苏州)有限公司
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