A method to suppress the influence of LED nonlinear distortion on the performance of visible light communication

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 large channel differences, lower BER performance, synchronization and hardware implementation complexity, etc., and reduce the synchronization requirements , hardware implementation is simple and easy to deploy

CN110492938BActive Publication Date: 2022-07-22LANZHOU UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-07-22

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Abstract

A method for suppressing the influence of LED nonlinear distortion on the performance of visible light communication. The main steps are: (1) mapping a modulation symbol sequence, and the output signal satisfies Hermitian symmetry; (2) multiplying the mapped signal by a scale change factor; (3) ) to perform IFFT, and then slice and decompose the optical OFDM symbols to obtain multiple decomposed symbols with smaller amplitudes; (4) decompose the symbols serially framing; (5) the receiving end serially receives all the optical OFDM symbols in a frame in sequence , respectively delayed until the symbols are aligned; (6) the corresponding bits are added and combined into an optical OFDM symbol. The invention is easy to control the average power of the optical OFDM symbol, easy to synchronize, simple to realize, and easy to deploy.
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Description

technical field

[0001] The invention relates to a technology for suppressing the influence of LED nonlinear distortion on visible light communication performance, in particular to a method for suppressing the influence of LED nonlinear distortion on visible light communication performance by using a repetitive amplitude limiting method. Background technique

[0002] With the convergence of various industries and mobile communications, especially the development of mobile Internet and Internet of Things, it has brought new challenges to mobile communication technology, the next generation (5G) wireless communication by 2020, the communication rate (peak rate) It will increase by 10 times, and the global mobile data traffic will reach 500-1000 times that of 2010. Generally, there are three main ways to improve 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) use interfer...

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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 transmitting 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 a rectangularly distributed constellation point, where M represents the modulation order, and X represents the average power-normalized modulation symbol sequence.

[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 signal. According to the properties of Fourier transform, the signal input to the inverse Fourier transform (IDFT) satisfies the Hermitian symmetry, that is, the second half of the input signa...