Device and method for communication based on LED visible light and digital micromirror array
A digital micromirror array and visible light communication technology, applied in the field of visible light communication, can solve the problems of low speed and limited imaging detectors, and achieve the effect of saving storage resources and improving transmission distance
Active Publication Date: 2017-12-08
上海中科辰新卫星技术有限公司
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In addition to the above two methods, the transmission rate of the system can also be improved through the MIMO technology of space division multiplexing, but limited by the imaging detector, the realization rate of this technology is not high at present
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] In order to make the above objects, features and advantages of the present invention more obvious and comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] Such as figure 1 As shown, the visible light communication device based on LED visible light and digital micromirror array provided by the embodiment of the present invention includes: encoding and modulation system 11, LED transmitter 22; digital micromirror array (DMD) 33, single-pixel detector, analog Digital converter (A / D) 44, modem 55; Described digital micromirror array 33 is made up of a large amount of micro-vibration reflectors, and reflector is fixed by hinge, and the direction of each micromirror is controlled by random number generator, Quickly deflect +12° or -12° on the horizontal plane; ...
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The present invention relates to a device for communication based on LED visible light and a digital micromirror array. The device comprises a coding and modulation system, a LED transmitter, a digital micromirror array, a single-pixel detector, an analog-digital converter and a modem. The digital micro-mirror array is formed by a lot of drivable micro-vibration reflectors which are fixed through hinges, a random number generator (RNG) is configured to control the direction of each micromirror, and each micromirror rapidly performs deflection of +12 degrees or -12 degrees on a horizontal plane; the coding and modulation system modulates an original binary system bit stream to drive the LED transmitter to transmit optical signals, the optical signals are projected to the digital micromirror array through a first lens, the total energy of the reflection light at the surface of the digital micromirror array is focused on the single-pixel detector through a second lens, voltage values at two ends of the single-pixel detector are amplified, and a measurement value v is obtained through the analog-digital converter; and the analog-digital converter is configured to convert the measurement value to digital signals, and the digital signals are demodulated to original signals through the modem.
Description
technical field [0001] The invention relates to the field of visible light communication, in particular to a communication device and method based on LED visible light and a digital micromirror array. Background technique [0002] LED-based visible light communication technology has received more and more attention. But under the Nyquist sampling theory, the limited bandwidth of LEDs limits the transmission rate. In view of this situation, it is particularly important to design a simple and effective way to improve the modulation bandwidth of the LED and improve the transmission distance of the system. [0003] At present, to increase the modulation width of LEDs, blue light filtering and equalization technology filters out yellow light components by adding a blue light filter. This method is simple to implement and is a relatively conventional solution. Another method is to use RGB-LED instead of LED as the light source. Using WDM technology can not only obtain higher mod...
Claims
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Inventor 王新宇张永合丁国鹏韩兴博郭明支帅张博
Owner 上海中科辰新卫星技术有限公司