Implicit imaging communication method based on spatial joint quantization

Abstract

The invention relates to the field of visible light communication, and specifically discloses an implicit imaging communication method based on spatial joint quantization. The method comprises the following steps: calculating an equivalent level number M0 of joint quantization output according to an effective control level number M of a single light emitting unit and the number N of light emittingunits of joint quantization; quantizing the value of a to-be-sent waveform at a certain moment according to M0 levels to obtain an output level V0 of the joint quantization, using a level Vn(i) as alight intensity control level of the nth light emitting unit, superposing the Vn(i) with a corresponding original image frame, and then transmitting the same. According to the implicit imaging communication method disclosed by the invention, by adoption of the joint quantization design of the plurality of light emitting units, the quantization signal-to-noise ratio of the weak signal is improved,and the influence of the quantization error is reduced; and moreover, the implicit imaging communication method is suitable for the quantitative transmission of the arbitrary waveform. By adoption ofthe implicit imaging communication method disclosed by the invention, each unit participating in the joint has a different level rather than a simple repetition under the criterion of reducing the quantization error.

Description

technical field [0001] The invention relates to the field of visible light communication, and specifically discloses an implicit imaging communication method based on spatial joint quantification. Background technique [0002] In the field of imaging communication of visible light, the traditional quantization method is to independently quantize the signal of each light-emitting unit (pixel), and the quantization error depends on the input signal amplitude and the number of quantization bits (binary bits) supported by the pixel. [0003] When the traditional method uses multiple light-emitting units (pixels) in the image space to jointly send a certain signal, multiple independently quantized pixel signals are directly superimposed, which only plays the role of accumulating signal energy and does not reduce the quantization error. [0004] In order to reduce the impact of quantization error, the traditional method is usually constrained by restricting the type of waveform to...

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Problems solved by technology

[0004] In order to reduce the impact of quantization error, the traditional method is usually constrained by restricting the type of waveform to be sent (such as using a simple rectangular binary waveform, which can effectively reduce the quantization error when the number of quantization levels is small), but it cannot solve the problem of sending any The problem of quantization error in waveforms. For communication signals, simple waveforms (such as rectangular waveforms) often have problems such as wide frequency band occupation and low information rate. Using a waveform with high randomness is more conducive to the design of communication signals

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