Multi-transmitting-multi-receiving LED visible light communication system

A visible light communication, multi-input and multi-transmit technology, applied in the field of visible light communication system based on multi-input and multi-transmit LED, can solve the problems of low working voltage, poor color rendering, high initial cost, etc., to reduce loss and waste, reduce bit error rate, The effect of improving reliability

Inactive Publication Date: 2016-05-18
SUZHOU YANDI INTELLIGENT SCI & TECH
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  • Application Information

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Problems solved by technology

LED advantages: high electro-optical conversion efficiency (close to 60%, green environmental protection, long life (up to 100,000 hours), low working voltage (about 3V), no loss of life after repeated switching, small size, less heat generation, high brightness, durable, Easy dimming, various colors, concentrated and stable beam, no delay in starting; LED disadvantages: high initial cost, poor color rendering, low efficiency of high-power LED, constant current drive (requires a dedicated drive circuit)

Method used

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  • Multi-transmitting-multi-receiving LED visible light communication system
  • Multi-transmitting-multi-receiving LED visible light communication system

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Embodiment

[0019] Based on multi-receiving and multi-transmitting LED visible light communication system, it consists of QPSK modulation and demodulation module, OFDM module, MIMO transmission and reception module and channel module. The QPSK modulation and demodulation module transmits the source digital signal through modulation and maps the baseband signal to each other. The orthogonal constellation point becomes a frequency band signal. The QPSK module at the receiving end demodulates the modulated QPSK signal, and moves the frequency band signal back to the baseband signal. The OFDM module performs OFDM modulation on the frequency band signal at the transmitting end. After modulation, The serial signal becomes a parallel signal, and a cyclic prefix is ​​added. At the receiving end, the OFDM modulation module demodulates the modulated OFDM signal to restore the parallel signal to a serial frequency band signal; at the transmitting end, the MIMO module The OFDM symbols are coded by STB...

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Abstract

The invention relates to a multi-transmitting-multi-receiving LED visible light communication system comprising a QPSK modulation and demodulation module, an OFDM module, an MIMO transmitting and receiving module and a channel module. A transmitting terminal of the QPSK modulation and demodulation module modulates a source digital signal into a baseband signal and maps the modulated signal to constellation points orthogonal to each other to obtain a frequency band signal; a receiving terminal of the QPSK module demodulates a modulated QPSK signal and the frequency band signal is moved back to the baseband signal. The OFDM module carries out OFDM modulation on the frequency band signal at a transmitting terminal; after modulation, a serial signal is converted into a parallel signal; a cyclic prefix is added; at a receiving terminal, the OFDM module carries out demodulation on the modulated OFDM signal and the parallel signal is recovered to the serial frequency band signal. The MIMO module carries out STBC coding on an OFDM symbol at a transmitting terminal, so that code streams sent by antennas are orthogonal to each other; and multiple antennas carry out transmitting simultaneously.

Description

technical field [0001] The present invention relates to the field of visible light illumination, and more specifically relates to a visible light communication system based on multi-receiving and multi-emitting LEDs. Background technique [0002] Light-emitting diodes are referred to as LEDs for short. Diodes made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc., can radiate visible light when electrons and holes recombine, so they can be used to make light-emitting diodes. It is used as an indicator light in circuits and instruments, or as a text or number display. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Due to chemical properties, it is divided into organic light-emitting diode OLED and inorganic light-emitting diode LED. Light-emitting diodes can also be divided into ordinary monochromatic light-emitting ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04B10/116
Inventor孟黎歌徐群歆
OwnerSUZHOU YANDI INTELLIGENT SCI & TECH