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Visibility method for recognizing propagation path

A technology of transmission path and identification method, which is applied in the field of transmission path visibility identification, can solve the problems of the decrease of recognition rate, the inability to distinguish LOS propagation path error and quasi-LOS, etc., and achieve the effect of high recognition rate

Inactive Publication Date: 2004-05-26
HUAWEI TECH CO LTD
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Problems solved by technology

[0012] The disadvantages of this NLOS identification method based on the power (or amplitude) difference between paths are: since this method is based on shape matching, the identification rate will drop when the channel environment is complex, and it cannot distinguish between LOS and LOS with small propagation path errors. quasi-LOS, which limits the further improvement of the positioning accuracy of the mobile station

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  • Visibility method for recognizing propagation path
  • Visibility method for recognizing propagation path
  • Visibility method for recognizing propagation path

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Embodiment Construction

[0024] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] refer to image 3 , the communication path visibility identification method of the present invention, comprises the following steps:

[0026] Step A, obtaining multiple continuous multipath delay distributions at the receiving end;

[0027] Step B. Obtain a sample in each multipath delay distribution to obtain a sample population;

[0028] Step C, calculating the mean and standard deviation of all sample values ​​in the above-mentioned sample population, and using the ratio of the standard deviation to the mean as the sample dispersion coefficient;

[0029] Step D, judging the visibility of the propagation path according to the sample dispersion coefficient.

[0030] The acquisition of multiple continuous multipath delay distributions described in step A may include the following steps:

[0031] Step A1, th...

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Abstract

The method includes (1) multiple multipath time delay distributions are obtained at receiving end; (2) one sample is fetched from each multipath time delay distribution so as to obtain entirety of sample; (3) calculating mean value and standard deviation of all sample value in entirety of sample, and ratio between standard deviation and mean value is as dispersion coefficient of sample; (4) based on dispersion coefficient of sample, visibility of propagation path is determined in order to distinguish propagations of NLOS, LOS and quasi-LOS. The invention possesses higher recognition rate under complex environment of channel.

Description

technical field [0001] The invention relates to mobile station positioning in the technical field of mobile communication, in particular to a propagation path visibility identification method. Background technique [0002] In the code division multiple access (CDMA) mobile communication system, an important technical way to improve the location estimation accuracy of the mobile station is to identify the visible channel (LOS) and the non-visual channel (NLOS) channel, because it affects the positioning accuracy of the mobile station. Among various factors, the influence (degradation) of the time delay estimation error caused by the non-visual (NLOS) path on the position estimation accuracy is the most serious. Visible channel (LOS) and non-visual (NLOS) channel can be understood as direct channel (path) and non-direct channel (path). [0003] The technique of identifying Non-Line-of-Sight Channels (NLOS) for mobile station location was first described by M.P. Wylie in a pap...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04W64/00
Inventor 刁心玺王卫锋
Owner HUAWEI TECH CO LTD