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OFDM visible light receiving and transmitting method with self-adaptive transmission amplitude digit compression

An adaptive transmission and visible light technology, applied in the field of communication, can solve the problems of low signal-to-noise ratio, affecting the effective number of ADC output bits, and deteriorating the signal judgment situation, and achieve the effect of reducing hardware performance requirements

Active Publication Date: 2019-10-11
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0004] In real-time visible light communication, due to the limitation of LED luminous power, the signal-to-noise ratio (SNR) of the actual system will be relatively low, which directly affects the effective number of output bits of the ADC, and then deteriorates the demodulation at the receiving end after FFT Signal Judgment Situation

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  • OFDM visible light receiving and transmitting method with self-adaptive transmission amplitude digit compression
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  • OFDM visible light receiving and transmitting method with self-adaptive transmission amplitude digit compression

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[0074] To facilitate a better understanding of the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art can easily understand the present invention from the contents disclosed in this description. Other advantages and effects.

[0075] The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0076] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indications are only used to explain the position in a certain posture (as shown in the accompanying drawings). If ...

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Abstract

The invention relates to the technical field of communication, in particular to an OFDM (Orthogonal Frequency Division Multiplexing) visible light receiving and transmitting method, system and platform with adaptive transmission amplitude digit compression and a storage medium. By calculating and judging the bit error rate (BER) of the system, the scheme of the invention is provided to realize high-order OFDM visible light communication under a low SNR (Signal to Noise Ratio) and reduce the peak-to-average power ratio (PAPR) of the system at the same time. On the basis of the principle of an amplitude limiting method, intervals with different densities are selected according to the advantages and disadvantages of a channel signal-to-noise ratio (SNR) to carry out amplitude bit compressionon a time domain OFDM signal, so that high-order modulation communication is met under the condition of low SNR in an actual environment. The method is improved based on a traditional amplitude limiting method, the calculation complexity is low, the system device performance requirement can be effectively reduced, the requirement for real-time visible light communication is met, the tolerance degree of a high-order modulation system to low SNR can be remarkably improved, and compared with a traditional method, the performance requirement for a hardware circuit is reduced in an actual system.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, system, platform and storage medium for OFDM visible light transmission and reception with adaptive transmission amplitude bit compression. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation method in the communication field, which divides a signal into multiple sub-signals, and then uses these divided sub-signals to modulate mutually orthogonal sub-carriers, thereby performing Communication, the implementation of this communication method can reduce and eliminate the influence of intersymbol crosstalk to overcome the frequency selective fading of the channel. Since the frequency spectrum of sub-carriers is allowed to overlap each other and be restored without distortion at the receiving end, higher spectrum utilization can be achieved. Visible light communication system (VLC, Visible Light Commu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26H04L27/34H04B10/40H04B10/116
CPCH04L25/03159H04B10/116H04B10/40H04L27/2602H04L27/34
Inventor 魏正军陶志远管晓军王桂发顾佳美尹以安
Owner SOUTH CHINA NORMAL UNIVERSITY
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