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Design method of complex color shift keying constellation diagram for optical ofdm system

A design method and constellation diagram technology, applied in the field of visible light communication, can solve problems such as low performance, and achieve the effect of reducing complexity and improving bit error rate performance

Active Publication Date: 2021-02-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The method provided by the present invention provides a complex color shift keying constellation for an optical OFDM system in order to solve the technical defect of relatively low performance of the O-OFDM method based on polar modulation and complex color shift keying provided by the prior art Graph design method, which improves the bit error rate performance of the system by increasing the minimum Euclidean distance of the constellation diagram

Method used

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  • Design method of complex color shift keying constellation diagram for optical ofdm system
  • Design method of complex color shift keying constellation diagram for optical ofdm system
  • Design method of complex color shift keying constellation diagram for optical ofdm system

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Embodiment 1

[0044] The new constellation diagram method designed by this method can be used in many common O-OFDM schemes, such as ACO-OFDM, DCO-OFDM, U-OFDM, etc.; it can also be used in CSK schemes with different LED configurations, such as TLED and QLED. For ease of description, the following will take the system model under the TLED configuration as an example to illustrate the usage scheme of the new RPM-CCSK constellation diagram in the O-OFDM system. For simplicity, the "constellation diagram" mentioned below refers to the "CCSK constellation diagram".

[0045] Firstly, the CCSK-OFDM system model applicable to the RPM-CCSK constellation diagram is introduced, such as figure 1 shown. The two modules of RPM-CCSK constellation diagram mapping and RPM-CCSK constellation diagram mapping in the figure adopt the new CCSK constellation diagram designed by the present invention. Such as figure 1 As shown, the bit information is first mapped to n through the RPM-CCSK constellation diagram...

Embodiment 2

[0074] In order to more fully illustrate the beneficial effects of the present invention, the effectiveness and advancement of the present invention will be further described below in combination with simulation analysis and results.

[0075] Consider N u The RPM-CCSK-OFDM system of =64 adopts the LED configuration of TLED, and uses the CSK modulation method of Color Band Combination One (CBC-1) defined by the IEEE802.15.7 standard. Without loss of generality, ACO-OFDM is chosen as the O-OFDM scheme.

[0076] First compare the performance of RPM-CCSK-OFDM and existing PM-CCSK-OFDM, such as Figure 5 (a) shown. It can be seen that the RPM-CCSK-OFDM scheme with the new constellation diagram has a significant performance improvement compared with the existing PM-CCSK-OFDM scheme, and the performance improvement becomes more and more obvious as the modulation order increases. On the other hand, assuming that the peak transmission rate is m~=6 bits / symbol, use ACO-OFDM, DCO-OFDM...

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Abstract

The invention relates to a plural color shift keying constellation diagram design method for an optical OFDM system. An optimal enlargement factor can be calculated according to an optimization targetof minimizing a bit error rate (BER), and the rotated and amplified constellation diagram has the largest minimum Euclidean distance (MED) and the optimal bit error rate performance, so significant BER performance improvement is achieved compared with the original scheme. Meanwhile, according to the method, independent demapping is performed on polar bits and CSK bits are by using the symmetry ofthe rotated constellation diagram, so that the demapping complexity is reduced to half of the traditional scheme.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, and more specifically, to a novel complex color shift keying (Complex Color Shift Keying, CCSK) constellation diagram design method based on rotation and magnification. The CCSK constellation diagram designed by this method can be used to improve the bit error rate performance of the optical orthogonal frequency division multiplexing (Optical Orthogonal Frequency Division Multiplexing, O-OFDM) communication system using CCSK, and can effectively reduce the calculation of the existing CCSK system the complexity. Background technique [0002] In recent years, visible light communication (Visible Light Communication, VLC) has attracted extensive attention from researchers due to its advantages of multiplexing, energy saving, environmental protection, and high-speed transmission, and has become a powerful supplement to traditional wireless communication [1]. The VLC syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/00H04B10/116
CPCH04B10/116H04L27/0004H04L27/0014H04L27/2627H04L27/2649
Inventor 江明徐建勋
Owner SUN YAT SEN UNIV