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A Visible Light Communication Transmission Method with Hybrid Single-Carrier and Multi-Carrier Modulation

A multi-carrier modulation and visible light communication technology, which is applied in the field of wireless optical communication, can solve the problems of low code rate and low spectrum utilization rate, and achieve the effects of improving code rate, high spectral efficiency and high power efficiency

Active Publication Date: 2021-12-17
JIANGNAN UNIV +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low code rate and low spectrum utilization rate in the existing optical communication modulation technology, the present invention provides a visible light communication transmission method with mixed single-carrier and multi-carrier modulation, which effectively improves the spectrum of the system Utilization, with good flexibility and low complexity

Method used

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  • A Visible Light Communication Transmission Method with Hybrid Single-Carrier and Multi-Carrier Modulation
  • A Visible Light Communication Transmission Method with Hybrid Single-Carrier and Multi-Carrier Modulation
  • A Visible Light Communication Transmission Method with Hybrid Single-Carrier and Multi-Carrier Modulation

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Embodiment Construction

[0059] Such as Figure 1 ~ Figure 4 As shown, the present invention is a visible light communication transmission method mixed with single-carrier and multi-carrier modulation, which includes the following steps.

[0060] S1: Perform QAM modulation on the input signal, perform serial-to-parallel conversion on the mapped data, add conjugate data, and then form a Hermitian symmetric matrix according to the data characteristic requirements, and generate an ACO-OFDM signal matrix X;

[0061] The expression of the ACO-OFDM signal matrix X is as follows:

[0062]

[0063] In the formula:

[0064] x k =a k +ib k ,

[0065] N is the total number of OFDM subcarriers.

[0066] S2: Perform PAM modulation on the input signal, perform serial-to-parallel conversion on the mapped data, add conjugate data, and then form a symmetrical matrix according to the data characteristic requirements to generate a PAM-DMT signal matrix Y;

[0067] The expression of the PAM-DMT signal matrix Y ...

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Abstract

The present invention provides a visible light communication transmission method mixed with single-carrier and multi-carrier modulation, which effectively improves the spectrum utilization rate of the system, and has good flexibility and low complexity. It comprises steps: S1: Carry out QAM modulation to input signal, generate symmetrical ACO-OFDM signal matrix; S2: Carry out PAM modulation to input signal, generate symmetrical PAM-DMT signal matrix; S3: ACO-OFDM signal matrix, PAM ‑DMT signal matrix respectively performs N-point IFFT transformation, adds cyclic prefix, parallel-serializes the data, cuts off the negative end of the signal, and adds two sets of data to form the HACO‑OFDM signal; S4: OOK data Symmetrical operation to form a symmetrical OOK signal; S5: subtract the time-selective offset from the HACO-OFDM signal, and then add a symmetrical OOK signal to finally form a transmitted signal; S6: transmit the transmitted signal to the channel, at the receiver end The demodulation operation is performed on the received signal, and each signal is recovered.

Description

technical field [0001] The invention relates to the field of wireless optical communication, in particular to a visible light communication transmission method mixed with single carrier and multi-carrier modulation. Background technique [0002] Visible light communication technology is a communication technology that uses high-speed bright and dark flashing signals invisible to the naked eye emitted by fluorescent lamps, light-emitting diodes and other light sources to transmit information. Connect the Internet signal transceiver device to the lighting device to form a network system that can cover the reach of indoor lighting. figure 1 It is the basic schematic diagram of the visible light communication system. After the input data is preprocessed, coded and modulated, and digital-to-analog converted, the electrical signal is converted into an optical signal, and the LED is driven by the sending module installed on the LED device, and transmitted to the receiving end by vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/516
CPCH04B10/116H04B10/5161
Inventor 李正权周颖李宝龙薛晓妹吴琼刘洋武贵路
Owner JIANGNAN UNIV
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