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Method and apparatus for measuring motion velocity of mobile station

A technology of motion speed and mobile station, which is applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as difficult implementation and complicated measurement method implementation process, and achieve the effects of simple implementation, increased objectivity, and enhanced reliability

Active Publication Date: 2009-05-20
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0022] It can be known from the above introduction to the measurement method of the moving speed of the mobile station in the prior art that the implementation process of the existing measurement method is relatively complicated and difficult to implement.

Method used

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  • Method and apparatus for measuring motion velocity of mobile station
  • Method and apparatus for measuring motion velocity of mobile station
  • Method and apparatus for measuring motion velocity of mobile station

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Embodiment Construction

[0054] The basic idea of ​​the present invention is to calculate the correlation angle value of two channel vectors at a certain time interval on the pilot subcarrier in the downlink subframe, and determine the moving speed of the mobile station through the correlation angle value.

[0055] Basic principle of the present invention is:

[0056] In an Orthogonal Frequency Division Multiplexing (OFDM) system, the correlation function of the channel information value on a pilot subcarrier can be expressed as:

[0057]

[0058] Among them, f d is the maximum Doppler frequency shift, J 0 (·) is the zero-order Bessel function of the first kind.

[0059] For the actual channel information estimate, it often contains noise signals, so the above formula can be written as:

[0060]

[0061] in, is the noise power spectral density, H is the channel information value, k is the kth moment, τ is the time interval, f d is the maximum Doppler shift, J 0 (·) is the zero-order Besse...

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Abstract

The invention provides a method for measuring the moving speed of a mobile station, which is characterized by determining corresponding relation between correlated included angle values of channel vectors and the moving speed of the mobile station at each set time interval, subsequently, the method also comprises: A, obtaining a channel information evaluation values of pilot subcarriers in a downlink subframe and calculating the correlated included angle value of the channel vectors corresponding to the pilot subcarriers of a selected row in the corresponding time interval; and B, determining the moving speed of the mobile station according to calculating results and the corresponding relation. The invention simultaneously provides a device for measuring the moving speed of the mobile station. The method and the device can simply and efficiently measure the moving speed of the mobile station.

Description

technical field [0001] The present invention relates to the technique of measuring the moving speed of a mobile station, in particular to a method and device for measuring the moving speed of a mobile station. Background technique [0002] In the mobile communication system, the movement of the mobile station causes the Doppler frequency shift and the change of the channel quality, which puts forward high requirements for the channel estimation and link adaptation technologies in the mobile communication system. Therefore, in the mobile communication system It is necessary to measure the moving speed of the mobile station to switch the working mode according to different moving speeds. [0003] Due to the movement of the mobile station, the phase and amplitude of the signal sent by the base station received by the mobile station will change, so the change can be used to measure the change of the moving speed of the mobile station. Aiming at the measurement of the moving spe...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04W24/08
Inventor 缪德山肖国军索士强
Owner DATANG MOBILE COMM EQUIP CO LTD
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