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Multi-input multi-output visible light communication system based on coefficient separation

A visible light communication, multi-output technology, applied in digital transmission systems, transmission systems, baseband systems, etc., can solve the problem of high complexity of the optimal receiver

Active Publication Date: 2017-08-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmitter of spatial light modulation is simple, but the complexity of the optimal receiver is too high

Method used

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  • Multi-input multi-output visible light communication system based on coefficient separation
  • Multi-input multi-output visible light communication system based on coefficient separation
  • Multi-input multi-output visible light communication system based on coefficient separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Assuming that the transmitter has 2 LEDs, the first group and the second group each have 1 LED, and the coordinates of the two LEDs are (1.5,3,6) and (4.5,3,6) respectively. The coordinates of the two PDs at the receiving end are (2.5,3,1) and (2.6,3,1), respectively, θ 1 = θ 2 = π / 4.

[0132] Such as Figure 4 As shown, the bit error rate performance of different modes includes the positive and negative coefficient separation mode of the present invention based on bipolar 16-PAM, wherein parameter B=2; the 2×2 MIMO mode based on DC bias 4-PAM, wherein two Independent DC bias 4-PAM data is sent, and the receiver adopts the minimum mean square error algorithm; based on DC bias 16-PAM diversity method, in which two LEDs send the same DC bias-based 16-PAM signal; based on Unipolar 8-PAM spatial light modulation method, in which 1 bit of information is modulated to the index of the LED, and the receiver uses maximum likelihood detection.

[0133] from Figure 4 It can ...

Embodiment 2

[0135] Assuming that the transmitter has 4 LEDs, the first group and the second group have 2 LEDs respectively, and the coordinates of the 4 LEDs are (1.2,3,6), (2.4,3,6), (3.6,3, 6), (4.8,3,6). Inside each LED group, the optical power is evenly distributed. The coordinates of the two PDs at the receiving end are (2.5,3,1) and (2.6,3,1), respectively, θ 1 = θ 2 = π / 6, M PNS =64. Figure 5 Described is the bit error rate performance of the positive and negative coefficient separation method in the present invention under different values ​​of the parameter B. It can be seen that the optimal parameter B designed in the present invention can obtain better bit error rate performance.

[0136] It can be seen from the above embodiments that the LEDs are divided into two groups at the transmitting end of the present invention, the first group transmits the positive part of the bipolar pulse amplitude modulation signal, and the second group transmits the negative part of the bipol...

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Abstract

The invention discloses a multi-input multi-output visible light communication system based on coefficient separation. At a transmitting end, LEDs are divided into two groups. The first group of LEDs transmits the positive integer part of a bipolar pulse amplitude modulation signal, and the second group of LEDs transmits the absolute value of the negative integer part of the bipolar pulse amplitude modulation signal. At a receiving end, a novel receiver with low computing complexity is utilized; the receivers utilizes the characteristic of a transmitted signal; the absolute value of the bipolar pulse amplitude modulation signal is estimated; and then the polarity of the bipolar pulse amplitude modulation signal is estimated; and finally estimation of the bipolar pulse amplitude modulation signal is finished. The multi-input multi-output visible light communication system with separated positive coefficient and negative coefficient according to the invention has advantages of low computing complexity, high performance, etc.

Description

technical field [0001] The invention belongs to wireless communication technology, and in particular relates to a multi-input multi-output visible light communication system based on coefficient separation. Background technique [0002] Visible light communication has received more and more attention, and it is a good supplement to traditional radio frequency wireless communication. Visible light communication generally adopts intensity modulation and direct detection technology, which means that the transmitted signal is a non-negative optical power signal. [0003] MIMO can provide space division multiplexing gain and diversity gain. Multiple-input multiple-output technology has been used in visible light communication systems to overcome the shortcomings of LED modulation bandwidth limitation. However, the spatial sub-channel correlation of multi-input multi-output visible light communication is strong. Space-division multiplexing gain in MIMO VLC has been studied to i...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/524H04B10/54H04B10/69H04L25/02
CPCH04B10/116H04B10/524H04B10/541H04B10/691H04L25/0204H04L25/0212
Inventor 吴亮张在琛党建
Owner SOUTHEAST UNIV
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