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A method, system and device for identifying visible and non-visual channels based on soft decision

A recognition method and soft decision technology, applied in the field of location service applications and wireless communications, to achieve the effect of high recognition accuracy, high accuracy and improved efficiency

Active Publication Date: 2022-06-28
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a line-of-sight / non-line-of-sight path identification method based on soft decision, solve the problem of distinguishing line-of-sight / non-line-of-sight paths in complex indoor environments, improve positioning accuracy, and achieve high-precision location service quality Purpose

Method used

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  • A method, system and device for identifying visible and non-visual channels based on soft decision
  • A method, system and device for identifying visible and non-visual channels based on soft decision
  • A method, system and device for identifying visible and non-visual channels based on soft decision

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Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Examples, results refer to figure 1 and figure 2 ,

[0075] (1) Get the data packet

[0076] A 2.4GHz-5.4GHz channel measurement platform is built in a 8*4m conference room to conduct channel measurement. First, 5 anchor nodes are arranged in the conference room as transmitting antenna positions, and target nodes are arranged at an interval of 0.05m in the conference room. as the receiving antenna position. Select 3 anchor nodes as line-of-sight (LOS) scenarios, and the remaining 2 anchor nodes as non-line-of-sight (NLOS) scenarios, use a laptop and a wireless router that supports the IEEE 802.11n standard to collect CSI information, and analyze the received data packets. Save, in each CSI information are represented the frequency, amplitude, phase of each sub-carrier and the signal state information representing the transmission signal from the transmitter to the receiver,

[0077]

[0078] Among them, H(f k ) represents the carrier center frequency f k CSI i...

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Abstract

The invention discloses a method for identifying visible and non-visible channels based on soft decision. The specific process is as follows: obtaining data packet information to calculate channel characteristics; calculating the probability distribution function of the obtained channel characteristics; using multiple Gaussian functions to fit S2 Probability distribution function; use soft judgment to judge whether the data packet information is received in a line-of-sight environment or a non-line-of-sight environment; the present invention combines two irrelevant features for soft-judgment identification of line-of-sight / non-line-of-sight. Compared with a single feature, Improve the accuracy of recognition, a single feature needs to train the signal to find a suitable threshold, but the present invention does not require too much training on the data, only needs to use the probability distribution of the training sample, and use the soft discriminant formula to calculate and identify the data packet The type greatly shortens the running time, does not need to go through multiple trainings to calculate the threshold, and requires less prior knowledge to obtain higher recognition accuracy.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to the application field of location services, in particular to a method, system and device for identifying visible and non-visual channels based on soft decision. Background technique [0002] With the continuous popularization of wireless devices, mobile terminal devices with positioning functions play an important role in people's daily life. At present, the positioning systems used on mobile terminals in our daily life all use the Global Positioning System (GPS). Its working principle is to use the satellite navigation system as the source of positioning information. The geographical location observed by satellites has the characteristics of high accuracy and high efficiency, and is now widely used in people's daily life, and brings a lot of convenience to people's lives. [0003] However, whether it is GPS or China's Beidou navigation and positioning system, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/33H04W64/00H04B17/30
CPCH04W4/33H04W64/00H04B17/30
Inventor 王威谢景丽刘鑫一侯俊
Owner CHANGAN UNIV