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Blending genetic and hill climbing algorithm for reducing VLC-OFDM system peak-to-average power ratio

A technology of peak-to-average power ratio and hill-climbing algorithm, which is applied in the field of communication to reduce PAPR, improve communication efficiency, and reduce nonlinear distortion.

Inactive Publication Date: 2016-11-23
CENT SOUTH UNIV
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Problems solved by technology

[0004] The technical problem solved by the present invention is: reduce the PAPR of VLC-OFDM system, reduce the nonlinear distortion of the system, improve the communication efficiency of the system, improve the performance of the communication system

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  • Blending genetic and hill climbing algorithm for reducing VLC-OFDM system peak-to-average power ratio
  • Blending genetic and hill climbing algorithm for reducing VLC-OFDM system peak-to-average power ratio
  • Blending genetic and hill climbing algorithm for reducing VLC-OFDM system peak-to-average power ratio

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and example, the present invention is described in further detail.

[0017] The present invention provides a scheme for reducing the PAPR of the OFDM visible light communication system based on a combination of genetic and mountain-climbing algorithms. The specific process is as follows figure 1 As shown, it includes the following five steps of S1, S2, S3, S4, and S5:

[0018] S1, such as figure 2 As shown in the first 4 parts, including: original data generation, BPSK modulation, serial-to-parallel conversion, pilot insertion and IFFT. After IFFT, an OFDM signal is obtained.

[0019] S2, such as figure 2 As shown in Section 5, the signal is processed using the proposed GH-PTS technique.

[0020] The block diagram of GH-PTS technology is as follows: image 3 shown. GH-PTS essentially groups data sub-carriers, optimizes them and then regroups them to reduce PAPR. The specific operation of GH-PTS is to divide a group...

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Abstract

The present invention relates to the field of the communication technology, and provides a PTS technology (GH-PTS) based on the genetic and hill climbing algorithm to reduce the VLC-OFDM system peak-to-average power ratio (PAPB). The technology comprises the following steps: S1, performing parallel of serial data at a sending terminal, and performing IFFT processing; S2, processing data through employing GH-PTS technology; S3, performing emission of the processed data through a LED lamp; S4, performing a solution GH-PTS operation of the data; and S5, performing FFT processing of the data, and performing demodulation output of the data. The PTS technology (GA--PTS) based on the genetic algorithm is combined with the climbing algorithm to improve the local searching optimization capability of the GA-PTS technology. Compared to a traditional PTS technology, the calculation complexity is low. Compared to the GA-PTS technology, the PAPR of the VLC-OFDM system can be effectively reduced in the condition that the BER performance of the VLC-OFDM system is not almost changed.

Description

technical field [0001] The invention relates to the field of communication technology, and mainly relates to a scheme for reducing the peak-to-average power ratio of a VLC-OFDM system by combining genetic and hill-climbing algorithms. Background technique [0002] Visible light communication (VLC) uses visible light emitted by white LEDs to transmit signals wirelessly. It uses indoor lighting equipment to replace the wireless LAN base station to transmit signals, and has abundant spectrum resources. Visible light communication has the advantages of high transmission power, no electromagnetic interference, energy saving, and no need for a radio spectrum license. However, the ISI (Inter-Symbol Interference) caused by the multipath effect is a fatal flaw of visible light communication. [0003] OFDM (Orthogonal Frequency Division Multiplexing) technology is a multi-carrier modulation technology with strong anti-multipath interference capability. In addition to the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 邓宏贵肖威蒋芳清李永陆姜山
Owner CENT SOUTH UNIV
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