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Method for inhibiting influence of LED nonlinear distortion on visible light communication performance

A visible light communication and non-linear distortion technology, which is applied in the direction of modulated carrier system, digital transmission system, short-distance system, etc., can solve the problems of synchronization and hardware implementation complexity, demodulation and recovery signal error, and reduce BER performance, etc., to achieve easy Deployment, reduced synchronization requirements, simple hardware implementation

Active Publication Date: 2019-11-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, multiple LEDs are required to transmit multiple signals at the same time, and the synchronization and hardware implementation are complicated
In addition, when the distance between the LEDs is large, the channel difference of the multi-channel signal received by the receiving end is large, especially when considering the scattering channel, then the demodulation recovery signal will cause a large error, thereby reducing the BER performance

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  • Method for inhibiting influence of LED nonlinear distortion on visible light communication performance
  • Method for inhibiting influence of LED nonlinear distortion on visible light communication performance
  • Method for inhibiting influence of LED nonlinear distortion on visible light communication performance

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Embodiment Construction

[0049] like figure 1 As shown, the present invention is a method for suppressing the influence of LED nonlinear distortion on the performance of visible light communication. The specific implementation of the sending end is as follows:

[0050] (1) Perform quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) on the input binary information sequence. Using Gray code, the length is log 2 The binary bit sequence of (M) is mapped to the constellation points of rectangular distribution, M represents the modulation order, and X represents the modulation symbol sequence normalized by the average power.

[0051] (2) The VLC system generally adopts the intensity modulation direct detection (IM / DD) technology, which requires the transmission signal to be a unipolar positive real number signal. According to the nature of the Fourier transform, the signal input to the inverse Fourier transform (IDFT) satisfies Hermitian symmetry, that is, the second half of the input s...

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Abstract

A method for inhibiting the influence of LED nonlinear distortion on visible light communication performance. The method mainly comprises the following steps: (1) carrying out modulation symbol sequence mapping, and satisfying the Hermitian symmetry by an output signal ; (2) multiplying the mapping signal by a scale change factor; (3) carrying out IFFT, then carrying out amplitude limiting decomposition on the optical OFDM symbol, and obtaining a plurality of decomposition symbols with small amplitudes; (4) decomposing symbol serial framing; (5) sequentially and serially receiving all the optical OFDM symbols in one frame by a receiving end, and respectively delaying until the symbols are aligned; and (6) adding the corresponding bits, and combining into an optical OFDM symbol. Accordingto the method, the average power of the optical OFDM symbols is easy to regulate and control. The synchronization is easy, and the implementation is easy. The deployment is easy.

Description

technical field [0001] The invention relates to a technology for suppressing the influence of LED nonlinear distortion on the performance of visible light communication, in particular to a method for suppressing the influence of LED nonlinear distortion on the performance of visible light communication by using a repeated clipping method. Background technique [0002] With the integration of various industries and mobile communications, especially the development of the mobile Internet and the Internet of Things, new challenges have been brought to mobile communication technology. By 2020, the next generation (5G) wireless communication, communication rate (peak rate) It will increase by 10 times, and the global mobile data traffic will reach 500-1000 times that of 2010. Usually, there are three main ways to increase the capacity of wireless communication systems: (1) use new spectrum to obtain larger bandwidth; (2) set up more base stations to increase cell density; (3) ado...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04L27/26
CPCH04B10/116H04L27/2602
Inventor 贾科军杨博然陆皓魏少博
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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