RSS-based LED positioning system and method

A positioning system and positioning method technology, applied in the field of LED optical communication and indoor positioning applications, can solve the problems of limited LED bandwidth, increase the hardware complexity of the sending end and receiving end, and increase the difficulty of LED deployment, so as to reduce the hardware complexity , The effect of saving LED bandwidth

Inactive Publication Date: 2014-12-03
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

Based on frequency distinction is the most commonly used method, that is, the signal at the sending end is sent using different frequency carriers, and the receiving end uses filters to filter out different frequency bands and calculate their power. The visible light positioning transmission frequency based on 3 LED positioning is as follows: figure 1 As shown; although this setting distinguishes different signal sources, the hardware customization increases the hardware complexity of the sending end and the receiving end. Different frequency divisions also increase the difficulty of LED placement, and the actual available LED bandwidth becomes limited

Method used

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  • RSS-based LED positioning system and method
  • RSS-based LED positioning system and method
  • RSS-based LED positioning system and method

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0029] The principle on which the present invention is based is assuming that the signal sent by the LED at the sending end is S 1 (t), without considering the multipath effect factor, the received signal at the receiving end can be expressed as S 2 (t)=aS 1 (t-D)+n(t), where n(t) is the noise, a is the signal attenuation, and D is the transmission delay of the signal. S 1 (t) and n(t) are random signals that are not correlated with each other, then the correlation function between the received signal and the sent signal can be expressed as:

[0030] R s 1 s 2 ( τ ) = a R s 1 ...

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Abstract

The invention discloses an RSS-based LED positioning system and method, and relates to the field of LED communication and indoor positioning application. The RSS-based LED positioning system comprises at least three sending ends and one receiving end. Each sending end comprises a T-shaped bias device and an LED. The sending ends add PN code sequences before data to be transmitted, and the sequences are converted to visible light for emitting through the T-shaped bias devices and the LEDs; a photo-detector at the receiving end detects visible light signals and converts the visible light signals into electric signals, one FFT unit performs FFT transformation on the electric signals, other FFT units are used for FFT transformation of each PN code, a multiplier performs convolution multiplying on a result and an FFT operation result of each PN code, each product carries out IFFT transformation, a comparison circuit is used for finding out a peak value of time domain signals, and a power-distance conversion module estimates the value of a distance between the receiving end and each LED and outputting the value. According to the invention, multiple orthogonal PN codes are sent for distinguishing different LED sources, such that the hardware complexity of the sending ends is reduced, and the LED bandwidth is decreased.

Description

technical field [0001] The invention relates to the application field of LED optical communication and indoor positioning, in particular to an RSS-based LED positioning system and method. Background technique [0002] LED (Lighting Emitting Diode, light-emitting diode) is called the fourth-generation lighting source or green light source. It has the characteristics of energy saving, environmental protection, long life, and small size. Fields such as lighting and urban night scenes are bound to become the next generation of lighting technology. Because LEDs have the advantages of energy saving, safety, and wide available spectrum, they can also be used in wireless optical communication systems while providing indoor lighting, and at the same time meet indoor Internet access and a series of extended applications. LED-based indoor positioning is one of the application directions with great potential. Since LEDs are placed in a fixed position indoors and have a wide coverage ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16H04B10/116
CPCG01S5/16H04B10/116
Inventor 刘武杨超杨奇
Owner WUHAN POST & TELECOMM RES INST CO LTD
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